Merge #755

755: Add support for flash and bootloader for F3, F7 and H7 r=matoushybl a=matoushybl



Co-authored-by: Matous Hybl <[email protected]>

42 files changed, 1414 insertions, 185 deletions

diff --git a/docs/modules/ROOT/pages/bootloader.adoc b/docs/modules/ROOT/pages/bootloader.adoc
index 7539774c4..3df2daf51 100644
--- a/docs/modules/ROOT/pages/bootloader.adoc
+++ b/docs/modules/ROOT/pages/bootloader.adoc
@@ -14,7 +14,7 @@ The bootloader supports both internal and external flash by relying on the `embe
 The bootloader supports
 
 * nRF52 with and without softdevice
-* STM32 L4, WB, WL, L1 and L0
+* STM32 L4, WB, WL, L1, L0, F3, F7 and H7
 
 In general, the bootloader works on any platform that implements the `embedded-storage` traits for its internal flash, but may require custom initialization code to work.
 
diff --git a/embassy-boot/stm32/Cargo.toml b/embassy-boot/stm32/Cargo.toml
index a706e4c06..78339b0a2 100644
--- a/embassy-boot/stm32/Cargo.toml
+++ b/embassy-boot/stm32/Cargo.toml
@@ -2,7 +2,7 @@
 authors = [
     "Ulf Lilleengen <[email protected]>",
 ]
-edition = "2018"
+edition = "2021"
 name = "embassy-boot-stm32"
 version = "0.1.0"
 description = "Bootloader for STM32 chips"
diff --git a/embassy-boot/stm32/src/lib.rs b/embassy-boot/stm32/src/lib.rs
index 82e32a97d..48512534b 100644
--- a/embassy-boot/stm32/src/lib.rs
+++ b/embassy-boot/stm32/src/lib.rs
@@ -67,7 +67,7 @@ impl<const PAGE_SIZE: usize> BootLoader<PAGE_SIZE> {
         [(); <<F as FlashProvider>::ACTIVE as FlashConfig>::FLASH::ERASE_SIZE]:,
     {
         match self.boot.prepare_boot(flash) {
-            Ok(_) => self.boot.boot_address(),
+            Ok(_) => embassy_stm32::flash::FLASH_BASE + self.boot.boot_address(),
             Err(_) => panic!("boot prepare error!"),
         }
     }
diff --git a/embassy-stm32/src/flash/f3.rs b/embassy-stm32/src/flash/f3.rs
new file mode 100644
index 000000000..a5dc8dd0a
--- /dev/null
+++ b/embassy-stm32/src/flash/f3.rs
@@ -0,0 +1,104 @@
+use core::convert::TryInto;
+use core::ptr::write_volatile;
+
+use crate::flash::Error;
+use crate::pac;
+
+pub(crate) unsafe fn lock() {
+    pac::FLASH.cr().modify(|w| w.set_lock(true));
+}
+
+pub(crate) unsafe fn unlock() {
+    pac::FLASH.keyr().write(|w| w.set_fkeyr(0x4567_0123));
+    pac::FLASH.keyr().write(|w| w.set_fkeyr(0xCDEF_89AB));
+}
+
+pub(crate) unsafe fn blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
+    pac::FLASH.cr().write(|w| w.set_pg(true));
+
+    let ret = {
+        let mut ret: Result<(), Error> = Ok(());
+        let mut offset = offset;
+        for chunk in buf.chunks(2) {
+            write_volatile(
+                offset as *mut u16,
+                u16::from_le_bytes(chunk[0..2].try_into().unwrap()),
+            );
+            offset += chunk.len() as u32;
+
+            ret = blocking_wait_ready();
+            if ret.is_err() {
+                break;
+            }
+        }
+        ret
+    };
+
+    pac::FLASH.cr().write(|w| w.set_pg(false));
+
+    ret
+}
+
+pub(crate) unsafe fn blocking_erase(from: u32, to: u32) -> Result<(), Error> {
+    for page in (from..to).step_by(super::ERASE_SIZE) {
+        pac::FLASH.cr().modify(|w| {
+            w.set_per(true);
+        });
+
+        pac::FLASH.ar().write(|w| w.set_far(page));
+
+        pac::FLASH.cr().modify(|w| {
+            w.set_strt(true);
+        });
+
+        let mut ret: Result<(), Error> = blocking_wait_ready();
+
+        if !pac::FLASH.sr().read().eop() {
+            trace!("FLASH: EOP not set");
+            ret = Err(Error::Prog);
+        } else {
+            pac::FLASH.sr().write(|w| w.set_eop(true));
+        }
+
+        pac::FLASH.cr().modify(|w| w.set_per(false));
+
+        clear_all_err();
+        if ret.is_err() {
+            return ret;
+        }
+    }
+
+    Ok(())
+}
+
+pub(crate) unsafe fn clear_all_err() {
+    pac::FLASH.sr().modify(|w| {
+        if w.pgerr() {
+            w.set_pgerr(true);
+        }
+        if w.wrprterr() {
+            w.set_wrprterr(true);
+        }
+        if w.eop() {
+            w.set_eop(true);
+        }
+    });
+}
+
+pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
+    loop {
+        let sr = pac::FLASH.sr().read();
+
+        if !sr.bsy() {
+            if sr.wrprterr() {
+                return Err(Error::Protected);
+            }
+
+            if sr.pgerr() {
+                return Err(Error::Seq);
+            }
+
+            return Ok(());
+        }
+    }
+}
diff --git a/embassy-stm32/src/flash/f7.rs b/embassy-stm32/src/flash/f7.rs
new file mode 100644
index 000000000..16316fd93
--- /dev/null
+++ b/embassy-stm32/src/flash/f7.rs
@@ -0,0 +1,138 @@
+use core::convert::TryInto;
+use core::ptr::write_volatile;
+
+use atomic_polyfill::{fence, Ordering};
+
+use crate::flash::Error;
+use crate::pac;
+
+pub(crate) unsafe fn lock() {
+    pac::FLASH.cr().modify(|w| w.set_lock(true));
+}
+
+pub(crate) unsafe fn unlock() {
+    pac::FLASH.keyr().write(|w| w.set_key(0x4567_0123));
+    pac::FLASH.keyr().write(|w| w.set_key(0xCDEF_89AB));
+}
+
+pub(crate) unsafe fn blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
+    pac::FLASH.cr().write(|w| {
+        w.set_pg(true);
+        w.set_psize(pac::flash::vals::Psize::PSIZE32);
+    });
+
+    let ret = {
+        let mut ret: Result<(), Error> = Ok(());
+        let mut offset = offset;
+        for chunk in buf.chunks(super::WRITE_SIZE) {
+            for val in chunk.chunks(4) {
+                write_volatile(
+                    offset as *mut u32,
+                    u32::from_le_bytes(val[0..4].try_into().unwrap()),
+                );
+                offset += val.len() as u32;
+
+                // prevents parallelism errors
+                fence(Ordering::SeqCst);
+            }
+
+            ret = blocking_wait_ready();
+            if ret.is_err() {
+                break;
+            }
+        }
+        ret
+    };
+
+    pac::FLASH.cr().write(|w| w.set_pg(false));
+
+    ret
+}
+
+pub(crate) unsafe fn blocking_erase(from: u32, to: u32) -> Result<(), Error> {
+    let start_sector = if from >= (super::FLASH_BASE + super::ERASE_SIZE / 2) as u32 {
+        4 + (from - super::FLASH_BASE as u32) / super::ERASE_SIZE as u32
+    } else {
+        (from - super::FLASH_BASE as u32) / (super::ERASE_SIZE as u32 / 8)
+    };
+
+    let end_sector = if to >= (super::FLASH_BASE + super::ERASE_SIZE / 2) as u32 {
+        4 + (to - super::FLASH_BASE as u32) / super::ERASE_SIZE as u32
+    } else {
+        (to - super::FLASH_BASE as u32) / (super::ERASE_SIZE as u32 / 8)
+    };
+
+    for sector in start_sector..end_sector {
+        let ret = erase_sector(sector as u8);
+        if ret.is_err() {
+            return ret;
+        }
+    }
+
+    Ok(())
+}
+
+unsafe fn erase_sector(sector: u8) -> Result<(), Error> {
+    pac::FLASH.cr().modify(|w| {
+        w.set_ser(true);
+        w.set_snb(sector)
+    });
+
+    pac::FLASH.cr().modify(|w| {
+        w.set_strt(true);
+    });
+
+    let ret: Result<(), Error> = blocking_wait_ready();
+
+    pac::FLASH.cr().modify(|w| w.set_ser(false));
+
+    clear_all_err();
+
+    ret
+}
+
+pub(crate) unsafe fn clear_all_err() {
+    pac::FLASH.sr().modify(|w| {
+        if w.erserr() {
+            w.set_erserr(true);
+        }
+        if w.pgperr() {
+            w.set_pgperr(true);
+        }
+        if w.pgaerr() {
+            w.set_pgaerr(true);
+        }
+        if w.wrperr() {
+            w.set_wrperr(true);
+        }
+        if w.eop() {
+            w.set_eop(true);
+        }
+    });
+}
+
+pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
+    loop {
+        let sr = pac::FLASH.sr().read();
+
+        if !sr.bsy() {
+            if sr.erserr() {
+                return Err(Error::Seq);
+            }
+
+            if sr.pgperr() {
+                return Err(Error::Parallelism);
+            }
+
+            if sr.pgaerr() {
+                return Err(Error::Unaligned);
+            }
+
+            if sr.wrperr() {
+                return Err(Error::Protected);
+            }
+
+            return Ok(());
+        }
+    }
+}
diff --git a/embassy-stm32/src/flash/h7.rs b/embassy-stm32/src/flash/h7.rs
new file mode 100644
index 000000000..afccffc4a
--- /dev/null
+++ b/embassy-stm32/src/flash/h7.rs
@@ -0,0 +1,202 @@
+use core::convert::TryInto;
+use core::ptr::write_volatile;
+
+use crate::flash::Error;
+use crate::pac;
+
+const SECOND_BANK_OFFSET: usize = 0x0010_0000;
+
+const fn is_dual_bank() -> bool {
+    super::FLASH_SIZE / 2 > super::ERASE_SIZE
+}
+
+pub(crate) unsafe fn lock() {
+    pac::FLASH.bank(0).cr().modify(|w| w.set_lock(true));
+    if is_dual_bank() {
+        pac::FLASH.bank(1).cr().modify(|w| w.set_lock(true));
+    }
+}
+
+pub(crate) unsafe fn unlock() {
+    pac::FLASH.bank(0).keyr().write(|w| w.set_keyr(0x4567_0123));
+    pac::FLASH.bank(0).keyr().write(|w| w.set_keyr(0xCDEF_89AB));
+
+    if is_dual_bank() {
+        pac::FLASH.bank(1).keyr().write(|w| w.set_keyr(0x4567_0123));
+        pac::FLASH.bank(1).keyr().write(|w| w.set_keyr(0xCDEF_89AB));
+    }
+}
+
+pub(crate) unsafe fn blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
+    let bank = if !is_dual_bank() || (offset - super::FLASH_BASE as u32) < SECOND_BANK_OFFSET as u32
+    {
+        pac::FLASH.bank(0)
+    } else {
+        pac::FLASH.bank(1)
+    };
+
+    bank.cr().write(|w| {
+        w.set_pg(true);
+        w.set_psize(2); // 32 bits at once
+    });
+
+    let ret = {
+        let mut ret: Result<(), Error> = Ok(());
+        let mut offset = offset;
+        'outer: for chunk in buf.chunks(super::WRITE_SIZE) {
+            for val in chunk.chunks(4) {
+                trace!("Writing at {:x}", offset);
+                write_volatile(
+                    offset as *mut u32,
+                    u32::from_le_bytes(val[0..4].try_into().unwrap()),
+                );
+                offset += val.len() as u32;
+
+                ret = blocking_wait_ready(bank);
+                bank.sr().modify(|w| {
+                    if w.eop() {
+                        w.set_eop(true);
+                    }
+                });
+                if ret.is_err() {
+                    break 'outer;
+                }
+            }
+        }
+        ret
+    };
+
+    bank.cr().write(|w| w.set_pg(false));
+
+    ret
+}
+
+pub(crate) unsafe fn blocking_erase(from: u32, to: u32) -> Result<(), Error> {
+    let from = from - super::FLASH_BASE as u32;
+    let to = to - super::FLASH_BASE as u32;
+
+    let bank_size = (super::FLASH_SIZE / 2) as u32;
+
+    let (bank, start, end) = if to <= bank_size {
+        let start_sector = from / super::ERASE_SIZE as u32;
+        let end_sector = to / super::ERASE_SIZE as u32;
+        (0, start_sector, end_sector)
+    } else if from >= SECOND_BANK_OFFSET as u32 && to <= (SECOND_BANK_OFFSET as u32 + bank_size) {
+        let start_sector = (from - SECOND_BANK_OFFSET as u32) / super::ERASE_SIZE as u32;
+        let end_sector = (to - SECOND_BANK_OFFSET as u32) / super::ERASE_SIZE as u32;
+        (1, start_sector, end_sector)
+    } else {
+        error!("Attempting to write outside of defined sectors");
+        return Err(Error::Unaligned);
+    };
+
+    trace!("Erasing bank {}, sectors from {} to {}", bank, start, end);
+    for sector in start..end {
+        let ret = erase_sector(pac::FLASH.bank(bank), sector as u8);
+        if ret.is_err() {
+            return ret;
+        }
+    }
+
+    Ok(())
+}
+
+unsafe fn erase_sector(bank: pac::flash::Bank, sector: u8) -> Result<(), Error> {
+    bank.cr().modify(|w| {
+        w.set_ser(true);
+        w.set_snb(sector)
+    });
+
+    bank.cr().modify(|w| {
+        w.set_start(true);
+    });
+
+    let ret: Result<(), Error> = blocking_wait_ready(bank);
+
+    bank.cr().modify(|w| w.set_ser(false));
+
+    bank_clear_all_err(bank);
+
+    ret
+}
+
+pub(crate) unsafe fn clear_all_err() {
+    bank_clear_all_err(pac::FLASH.bank(0));
+    bank_clear_all_err(pac::FLASH.bank(1));
+}
+
+unsafe fn bank_clear_all_err(bank: pac::flash::Bank) {
+    bank.sr().modify(|w| {
+        if w.wrperr() {
+            w.set_wrperr(true);
+        }
+        if w.pgserr() {
+            w.set_pgserr(true);
+        }
+        if w.strberr() {
+            // single address was written multiple times, can be ignored
+            w.set_strberr(true);
+        }
+        if w.incerr() {
+            // writing to a different address when programming 256 bit word was not finished
+            w.set_incerr(true);
+        }
+        if w.operr() {
+            w.set_operr(true);
+        }
+        if w.sneccerr1() {
+            // single ECC error
+            w.set_sneccerr1(true);
+        }
+        if w.dbeccerr() {
+            // double ECC error
+            w.set_dbeccerr(true);
+        }
+        if w.rdperr() {
+            w.set_rdperr(true);
+        }
+        if w.rdserr() {
+            w.set_rdserr(true);
+        }
+    });
+}
+
+pub(crate) unsafe fn blocking_wait_ready(bank: pac::flash::Bank) -> Result<(), Error> {
+    loop {
+        let sr = bank.sr().read();
+
+        if !sr.bsy() && !sr.qw() {
+            if sr.wrperr() {
+                return Err(Error::Protected);
+            }
+            if sr.pgserr() {
+                error!("pgserr");
+                return Err(Error::Seq);
+            }
+            if sr.incerr() {
+                // writing to a different address when programming 256 bit word was not finished
+                error!("incerr");
+                return Err(Error::Seq);
+            }
+            if sr.operr() {
+                return Err(Error::Prog);
+            }
+            if sr.sneccerr1() {
+                // single ECC error
+                return Err(Error::Prog);
+            }
+            if sr.dbeccerr() {
+                // double ECC error
+                return Err(Error::Prog);
+            }
+            if sr.rdperr() {
+                return Err(Error::Protected);
+            }
+            if sr.rdserr() {
+                return Err(Error::Protected);
+            }
+
+            return Ok(());
+        }
+    }
+}
diff --git a/embassy-stm32/src/flash/l.rs b/embassy-stm32/src/flash/l.rs
new file mode 100644
index 000000000..6ec4796a5
--- /dev/null
+++ b/embassy-stm32/src/flash/l.rs
@@ -0,0 +1,185 @@
+use core::convert::TryInto;
+use core::ptr::write_volatile;
+
+use crate::flash::Error;
+use crate::pac;
+
+pub(crate) unsafe fn lock() {
+    #[cfg(any(flash_wl, flash_wb, flash_l4))]
+    pac::FLASH.cr().modify(|w| w.set_lock(true));
+
+    #[cfg(any(flash_l0))]
+    pac::FLASH.pecr().modify(|w| {
+        w.set_optlock(true);
+        w.set_prglock(true);
+        w.set_pelock(true);
+    });
+}
+
+pub(crate) unsafe fn unlock() {
+    #[cfg(any(flash_wl, flash_wb, flash_l4))]
+    {
+        pac::FLASH.keyr().write(|w| w.set_keyr(0x4567_0123));
+        pac::FLASH.keyr().write(|w| w.set_keyr(0xCDEF_89AB));
+    }
+
+    #[cfg(any(flash_l0, flash_l1))]
+    {
+        pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x89ABCDEF));
+        pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x02030405));
+
+        pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x8C9DAEBF));
+        pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x13141516));
+    }
+}
+
+pub(crate) unsafe fn blocking_write(offset: u32, buf: &[u8]) -> Result<(), Error> {
+    #[cfg(any(flash_wl, flash_wb, flash_l4))]
+    pac::FLASH.cr().write(|w| w.set_pg(true));
+
+    let ret = {
+        let mut ret: Result<(), Error> = Ok(());
+        let mut offset = offset;
+        for chunk in buf.chunks(super::WRITE_SIZE) {
+            for val in chunk.chunks(4) {
+                write_volatile(
+                    offset as *mut u32,
+                    u32::from_le_bytes(val[0..4].try_into().unwrap()),
+                );
+                offset += val.len() as u32;
+            }
+
+            ret = blocking_wait_ready();
+            if ret.is_err() {
+                break;
+            }
+        }
+        ret
+    };
+
+    #[cfg(any(flash_wl, flash_wb, flash_l4))]
+    pac::FLASH.cr().write(|w| w.set_pg(false));
+
+    ret
+}
+
+pub(crate) unsafe fn blocking_erase(from: u32, to: u32) -> Result<(), Error> {
+    for page in (from..to).step_by(super::ERASE_SIZE) {
+        #[cfg(any(flash_l0, flash_l1))]
+        {
+            pac::FLASH.pecr().modify(|w| {
+                w.set_erase(true);
+                w.set_prog(true);
+            });
+
+            write_volatile(page as *mut u32, 0xFFFFFFFF);
+        }
+
+        #[cfg(any(flash_wl, flash_wb, flash_l4))]
+        {
+            let idx = page / super::ERASE_SIZE as u32;
+
+            pac::FLASH.cr().modify(|w| {
+                w.set_per(true);
+                w.set_pnb(idx as u8);
+                #[cfg(any(flash_wl, flash_wb))]
+                w.set_strt(true);
+                #[cfg(any(flash_l4))]
+                w.set_start(true);
+            });
+        }
+
+        let ret: Result<(), Error> = blocking_wait_ready();
+
+        #[cfg(any(flash_wl, flash_wb, flash_l4))]
+        pac::FLASH.cr().modify(|w| w.set_per(false));
+
+        #[cfg(any(flash_l0, flash_l1))]
+        pac::FLASH.pecr().modify(|w| {
+            w.set_erase(false);
+            w.set_prog(false);
+        });
+
+        clear_all_err();
+        if ret.is_err() {
+            return ret;
+        }
+    }
+
+    Ok(())
+}
+
+pub(crate) unsafe fn clear_all_err() {
+    pac::FLASH.sr().modify(|w| {
+        #[cfg(any(flash_wl, flash_wb, flash_l4, flash_l0))]
+        if w.rderr() {
+            w.set_rderr(true);
+        }
+        #[cfg(any(flash_wl, flash_wb, flash_l4))]
+        if w.fasterr() {
+            w.set_fasterr(true);
+        }
+        #[cfg(any(flash_wl, flash_wb, flash_l4))]
+        if w.miserr() {
+            w.set_miserr(true);
+        }
+        #[cfg(any(flash_wl, flash_wb, flash_l4))]
+        if w.pgserr() {
+            w.set_pgserr(true);
+        }
+        if w.sizerr() {
+            w.set_sizerr(true);
+        }
+        if w.pgaerr() {
+            w.set_pgaerr(true);
+        }
+        if w.wrperr() {
+            w.set_wrperr(true);
+        }
+        #[cfg(any(flash_wl, flash_wb, flash_l4))]
+        if w.progerr() {
+            w.set_progerr(true);
+        }
+        #[cfg(any(flash_wl, flash_wb, flash_l4))]
+        if w.operr() {
+            w.set_operr(true);
+        }
+    });
+}
+
+pub(crate) unsafe fn blocking_wait_ready() -> Result<(), Error> {
+    loop {
+        let sr = pac::FLASH.sr().read();
+
+        if !sr.bsy() {
+            #[cfg(any(flash_wl, flash_wb, flash_l4))]
+            if sr.progerr() {
+                return Err(Error::Prog);
+            }
+
+            if sr.wrperr() {
+                return Err(Error::Protected);
+            }
+
+            if sr.pgaerr() {
+                return Err(Error::Unaligned);
+            }
+
+            if sr.sizerr() {
+                return Err(Error::Size);
+            }
+
+            #[cfg(any(flash_wl, flash_wb, flash_l4))]
+            if sr.miserr() {
+                return Err(Error::Miss);
+            }
+
+            #[cfg(any(flash_wl, flash_wb, flash_l4))]
+            if sr.pgserr() {
+                return Err(Error::Seq);
+            }
+
+            return Ok(());
+        }
+    }
+}
diff --git a/embassy-stm32/src/flash/mod.rs b/embassy-stm32/src/flash/mod.rs
index cff3119fd..4be611d2e 100644
--- a/embassy-stm32/src/flash/mod.rs
+++ b/embassy-stm32/src/flash/mod.rs
@@ -1,8 +1,5 @@
-use crate::pac;
 use crate::peripherals::FLASH;
-use core::convert::TryInto;
 use core::marker::PhantomData;
-use core::ptr::write_volatile;
 use embassy::util::Unborrow;
 use embassy_hal_common::unborrow;
 
@@ -17,6 +14,12 @@ pub use crate::pac::FLASH_SIZE;
 pub use crate::pac::WRITE_SIZE;
 const FLASH_END: usize = FLASH_BASE + FLASH_SIZE;
 
+#[cfg_attr(any(flash_wl, flash_wb, flash_l0, flash_l1, flash_l4), path = "l.rs")]
+#[cfg_attr(flash_f3, path = "f3.rs")]
+#[cfg_attr(flash_f7, path = "f7.rs")]
+#[cfg_attr(flash_h7, path = "h7.rs")]
+mod family;
+
 pub struct Flash<'d> {
     _inner: FLASH,
     _phantom: PhantomData<&'d mut FLASH>,
@@ -33,37 +36,13 @@ impl<'d> Flash<'d> {
 
     pub fn unlock(p: impl Unborrow<Target = FLASH>) -> Self {
         let flash = Self::new(p);
-        #[cfg(any(flash_wl, flash_wb, flash_l4))]
-        unsafe {
-            pac::FLASH.keyr().write(|w| w.set_keyr(0x4567_0123));
-            pac::FLASH.keyr().write(|w| w.set_keyr(0xCDEF_89AB));
-        }
 
-        #[cfg(any(flash_l0))]
-        unsafe {
-            pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x89ABCDEF));
-            pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x02030405));
-
-            pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x8C9DAEBF));
-            pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x13141516));
-        }
+        unsafe { family::unlock() };
         flash
     }
 
     pub fn lock(&mut self) {
-        #[cfg(any(flash_wl, flash_wb, flash_l4))]
-        unsafe {
-            pac::FLASH.cr().modify(|w| w.set_lock(true));
-        }
-
-        #[cfg(any(flash_l0))]
-        unsafe {
-            pac::FLASH.pecr().modify(|w| {
-                w.set_optlock(true);
-                w.set_prglock(true);
-                w.set_pelock(true);
-            });
-        }
+        unsafe { family::lock() };
     }
 
     pub fn blocking_read(&mut self, offset: u32, bytes: &mut [u8]) -> Result<(), Error> {
@@ -89,36 +68,7 @@ impl<'d> Flash<'d> {
 
         self.clear_all_err();
 
-        #[cfg(any(flash_wl, flash_wb, flash_l4))]
-        unsafe {
-            pac::FLASH.cr().write(|w| w.set_pg(true))
-        }
-
-        let mut ret: Result<(), Error> = Ok(());
-        let mut offset = offset;
-        for chunk in buf.chunks(WRITE_SIZE) {
-            for val in chunk.chunks(4) {
-                unsafe {
-                    write_volatile(
-                        offset as *mut u32,
-                        u32::from_le_bytes(val[0..4].try_into().unwrap()),
-                    );
-                }
-                offset += val.len() as u32;
-            }
-
-            ret = self.blocking_wait_ready();
-            if ret.is_err() {
-                break;
-            }
-        }
-
-        #[cfg(any(flash_wl, flash_wb, flash_l4))]
-        unsafe {
-            pac::FLASH.cr().write(|w| w.set_pg(false))
-        }
-
-        ret
+        unsafe { family::blocking_write(offset, buf) }
     }
 
     pub fn blocking_erase(&mut self, from: u32, to: u32) -> Result<(), Error> {
@@ -127,135 +77,17 @@ impl<'d> Flash<'d> {
         if to < from || to as usize > FLASH_END {
             return Err(Error::Size);
         }
-        if from as usize % ERASE_SIZE != 0 || to as usize % ERASE_SIZE != 0 {
+        if ((to - from) as usize % ERASE_SIZE) != 0 {
             return Err(Error::Unaligned);
         }
 
         self.clear_all_err();
 
-        for page in (from..to).step_by(ERASE_SIZE) {
-            #[cfg(any(flash_l0, flash_l1))]
-            unsafe {
-                pac::FLASH.pecr().modify(|w| {
-                    w.set_erase(true);
-                    w.set_prog(true);
-                });
-
-                write_volatile(page as *mut u32, 0xFFFFFFFF);
-            }
-
-            #[cfg(any(flash_wl, flash_wb, flash_l4))]
-            unsafe {
-                let idx = page / ERASE_SIZE as u32;
-
-                pac::FLASH.cr().modify(|w| {
-                    w.set_per(true);
-                    w.set_pnb(idx as u8);
-                    #[cfg(any(flash_wl, flash_wb))]
-                    w.set_strt(true);
-                    #[cfg(any(flash_l4))]
-                    w.set_start(true);
-                });
-            }
-
-            let ret: Result<(), Error> = self.blocking_wait_ready();
-
-            #[cfg(any(flash_wl, flash_wb, flash_l4))]
-            unsafe {
-                pac::FLASH.cr().modify(|w| w.set_per(false));
-            }
-
-            #[cfg(any(flash_l0, flash_l1))]
-            unsafe {
-                pac::FLASH.pecr().modify(|w| {
-                    w.set_erase(false);
-                    w.set_prog(false);
-                });
-            }
-
-            self.clear_all_err();
-            if ret.is_err() {
-                return ret;
-            }
-        }
-
-        Ok(())
-    }
-
-    fn blocking_wait_ready(&self) -> Result<(), Error> {
-        loop {
-            let sr = unsafe { pac::FLASH.sr().read() };
-
-            if !sr.bsy() {
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if sr.progerr() {
-                    return Err(Error::Prog);
-                }
-
-                if sr.wrperr() {
-                    return Err(Error::Protected);
-                }
-
-                if sr.pgaerr() {
-                    return Err(Error::Unaligned);
-                }
-
-                if sr.sizerr() {
-                    return Err(Error::Size);
-                }
-
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if sr.miserr() {
-                    return Err(Error::Miss);
-                }
-
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if sr.pgserr() {
-                    return Err(Error::Seq);
-                }
-                return Ok(());
-            }
-        }
+        unsafe { family::blocking_erase(from, to) }
     }
 
     fn clear_all_err(&mut self) {
-        unsafe {
-            pac::FLASH.sr().modify(|w| {
-                #[cfg(any(flash_wl, flash_wb, flash_l4, flash_l0))]
-                if w.rderr() {
-                    w.set_rderr(false);
-                }
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if w.fasterr() {
-                    w.set_fasterr(false);
-                }
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if w.miserr() {
-                    w.set_miserr(false);
-                }
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if w.pgserr() {
-                    w.set_pgserr(false);
-                }
-                if w.sizerr() {
-                    w.set_sizerr(false);
-                }
-                if w.pgaerr() {
-                    w.set_pgaerr(false);
-                }
-                if w.wrperr() {
-                    w.set_wrperr(false);
-                }
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if w.progerr() {
-                    w.set_progerr(false);
-                }
-                #[cfg(any(flash_wl, flash_wb, flash_l4))]
-                if w.operr() {
-                    w.set_operr(false);
-                }
-            });
-        }
+        unsafe { family::clear_all_err() };
     }
 }
 
@@ -274,6 +106,7 @@ pub enum Error {
     Seq,
     Protected,
     Unaligned,
+    Parallelism,
 }
 
 impl<'d> ErrorType for Flash<'d> {
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index ba426128f..1a46f8124 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -50,7 +50,9 @@ pub mod i2c;
 
 #[cfg(crc)]
 pub mod crc;
-#[cfg(any(flash_l0, flash_l1, flash_wl, flash_wb, flash_l4))]
+#[cfg(any(
+    flash_l0, flash_l1, flash_wl, flash_wb, flash_l4, flash_f3, flash_f7, flash_h7
+))]
 pub mod flash;
 pub mod pwm;
 #[cfg(rng)]
diff --git a/examples/boot/stm32f3/.cargo/config.toml b/examples/boot/stm32f3/.cargo/config.toml
new file mode 100644
index 000000000..eb8a8b335
--- /dev/null
+++ b/examples/boot/stm32f3/.cargo/config.toml
@@ -0,0 +1,6 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace STM32F429ZITx with your chip as listed in `probe-run --list-chips`
+runner = "probe-run --chip STM32F303VCTx"
+
+[build]
+target = "thumbv7em-none-eabihf"
diff --git a/examples/boot/stm32f3/Cargo.toml b/examples/boot/stm32f3/Cargo.toml
new file mode 100644
index 000000000..d4ca600f8
--- /dev/null
+++ b/examples/boot/stm32f3/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+authors = ["Ulf Lilleengen <[email protected]>"]
+edition = "2021"
+name = "embassy-boot-stm32f3-examples"
+version = "0.1.0"
+
+[dependencies]
+embassy = { version = "0.1.0", path = "../../../embassy", features = ["nightly"] }
+embassy-stm32 = { version = "0.1.0", path = "../../../embassy-stm32", features = ["unstable-traits", "nightly", "stm32f303re", "time-driver-any", "exti"]  }
+embassy-boot-stm32 = { version = "0.1.0", path = "../../../embassy-boot/stm32" }
+embassy-traits = { version = "0.1.0", path = "../../../embassy-traits" }
+
+defmt = { version = "0.3", optional = true }
+defmt-rtt = { version = "0.3", optional = true }
+panic-reset = { version = "0.1.1" }
+embedded-hal = { version = "0.2.6" }
+
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
+
+[features]
+defmt = [
+      "dep:defmt",
+      "embassy-stm32/defmt",
+      "embassy-boot-stm32/defmt",
+]
diff --git a/examples/boot/stm32f3/README.md b/examples/boot/stm32f3/README.md
new file mode 100644
index 000000000..e92ffb692
--- /dev/null
+++ b/examples/boot/stm32f3/README.md
@@ -0,0 +1,29 @@
+# Examples using bootloader
+
+Example for STM32F3 demonstrating the bootloader. The example consists of application binaries, 'a'
+which allows you to press a button to start the DFU process, and 'b' which is the updated
+application.
+
+
+## Prerequisites
+
+* `cargo-binutils`
+* `cargo-flash`
+* `embassy-boot-stm32`
+
+## Usage
+
+```
+# Flash bootloader
+cargo flash --manifest-path ../../../embassy-boot/stm32/Cargo.toml --release --features embassy-stm32/stm32f303re --chip STM32F303RETx
+# Build 'b'
+cargo build --release --bin b
+# Generate binary for 'b'
+cargo objcopy --release --bin b -- -O binary b.bin
+```
+
+# Flash `a` (which includes b.bin)
+
+```
+cargo flash --release --bin a --chip STM32F303RETx
+```
diff --git a/examples/boot/stm32f3/build.rs b/examples/boot/stm32f3/build.rs
new file mode 100644
index 000000000..e1da69328
--- /dev/null
+++ b/examples/boot/stm32f3/build.rs
@@ -0,0 +1,37 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    if env::var("CARGO_FEATURE_DEFMT").is_ok() {
+        println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+    }
+}
diff --git a/examples/boot/stm32f3/memory.x b/examples/boot/stm32f3/memory.x
new file mode 100644
index 000000000..14b2a2c9f
--- /dev/null
+++ b/examples/boot/stm32f3/memory.x
@@ -0,0 +1,15 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  BOOTLOADER                        : ORIGIN = 0x08000000, LENGTH = 24K
+  BOOTLOADER_STATE                  : ORIGIN = 0x08006000, LENGTH = 4K
+  FLASH                             : ORIGIN = 0x08008000, LENGTH = 32K
+  DFU                               : ORIGIN = 0x08010000, LENGTH = 36K
+  RAM                         (rwx) : ORIGIN = 0x20000008, LENGTH = 32K
+}
+
+__bootloader_state_start = ORIGIN(BOOTLOADER_STATE) - ORIGIN(BOOTLOADER);
+__bootloader_state_end = ORIGIN(BOOTLOADER_STATE) + LENGTH(BOOTLOADER_STATE) - ORIGIN(BOOTLOADER);
+
+__bootloader_dfu_start = ORIGIN(DFU) - ORIGIN(BOOTLOADER);
+__bootloader_dfu_end = ORIGIN(DFU) + LENGTH(DFU) - ORIGIN(BOOTLOADER);
diff --git a/examples/boot/stm32f3/src/bin/a.rs b/examples/boot/stm32f3/src/bin/a.rs
new file mode 100644
index 000000000..db9262f43
--- /dev/null
+++ b/examples/boot/stm32f3/src/bin/a.rs
@@ -0,0 +1,44 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy_boot_stm32::FirmwareUpdater;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::flash::Flash;
+use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
+use embassy_stm32::Peripherals;
+use embassy_traits::adapter::BlockingAsync;
+use panic_reset as _;
+
+#[cfg(feature = "defmt-rtt")]
+use defmt_rtt::*;
+
+static APP_B: &[u8] = include_bytes!("../../b.bin");
+
+#[embassy::main]
+async fn main(_s: embassy::executor::Spawner, p: Peripherals) {
+    let flash = Flash::unlock(p.FLASH);
+    let mut flash = BlockingAsync::new(flash);
+
+    let button = Input::new(p.PC13, Pull::Up);
+    let mut button = ExtiInput::new(button, p.EXTI13);
+
+    let mut led = Output::new(p.PA5, Level::Low, Speed::Low);
+    led.set_high();
+
+    let mut updater = FirmwareUpdater::default();
+    button.wait_for_falling_edge().await;
+    let mut offset = 0;
+    for chunk in APP_B.chunks(2048) {
+        let mut buf: [u8; 2048] = [0; 2048];
+        buf[..chunk.len()].copy_from_slice(chunk);
+        updater
+            .write_firmware(offset, &buf, &mut flash, 2048)
+            .await
+            .unwrap();
+        offset += chunk.len();
+    }
+    updater.update(&mut flash).await.unwrap();
+    led.set_low();
+    cortex_m::peripheral::SCB::sys_reset();
+}
diff --git a/examples/boot/stm32f3/src/bin/b.rs b/examples/boot/stm32f3/src/bin/b.rs
new file mode 100644
index 000000000..814275988
--- /dev/null
+++ b/examples/boot/stm32f3/src/bin/b.rs
@@ -0,0 +1,25 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::Peripherals;
+use panic_reset as _;
+
+#[cfg(feature = "defmt-rtt")]
+use defmt_rtt::*;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    let mut led = Output::new(p.PA5, Level::High, Speed::Low);
+
+    loop {
+        led.set_high();
+        Timer::after(Duration::from_millis(500)).await;
+
+        led.set_low();
+        Timer::after(Duration::from_millis(500)).await;
+    }
+}
diff --git a/examples/boot/stm32f7/.cargo/config.toml b/examples/boot/stm32f7/.cargo/config.toml
new file mode 100644
index 000000000..df5114520
--- /dev/null
+++ b/examples/boot/stm32f7/.cargo/config.toml
@@ -0,0 +1,6 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace STM32F429ZITx with your chip as listed in `probe-run --list-chips`
+runner = "probe-run --chip STM32F767ZITx -v"
+
+[build]
+target = "thumbv7em-none-eabihf"
diff --git a/examples/boot/stm32f7/Cargo.toml b/examples/boot/stm32f7/Cargo.toml
new file mode 100644
index 000000000..857b287d5
--- /dev/null
+++ b/examples/boot/stm32f7/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+authors = ["Ulf Lilleengen <[email protected]>"]
+edition = "2021"
+name = "embassy-boot-stm32f7-examples"
+version = "0.1.0"
+
+[dependencies]
+embassy = { version = "0.1.0", path = "../../../embassy", features = ["nightly"] }
+embassy-stm32 = { version = "0.1.0", path = "../../../embassy-stm32", features = ["unstable-traits", "nightly", "stm32f767zi", "time-driver-any", "exti"]  }
+embassy-boot-stm32 = { version = "0.1.0", path = "../../../embassy-boot/stm32" }
+embassy-traits = { version = "0.1.0", path = "../../../embassy-traits" }
+
+defmt = { version = "0.3", optional = true }
+defmt-rtt = { version = "0.3", optional = true }
+panic-reset = { version = "0.1.1" }
+embedded-hal = { version = "0.2.6" }
+
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
+
+[features]
+defmt = [
+      "dep:defmt",
+      "embassy-stm32/defmt",
+      "embassy-boot-stm32/defmt",
+]
diff --git a/examples/boot/stm32f7/README.md b/examples/boot/stm32f7/README.md
new file mode 100644
index 000000000..bf9142a1c
--- /dev/null
+++ b/examples/boot/stm32f7/README.md
@@ -0,0 +1,29 @@
+# Examples using bootloader
+
+Example for STM32F7 demonstrating the bootloader. The example consists of application binaries, 'a'
+which allows you to press a button to start the DFU process, and 'b' which is the updated
+application.
+
+
+## Prerequisites
+
+* `cargo-binutils`
+* `cargo-flash`
+* `embassy-boot-stm32`
+
+## Usage
+
+```
+# Flash bootloader
+./flash-boot.sh
+# Build 'b'
+cargo build --release --bin b
+# Generate binary for 'b'
+cargo objcopy --release --bin b -- -O binary b.bin
+```
+
+# Flash `a` (which includes b.bin)
+
+```
+cargo flash --release --bin a --chip STM32F767ZITx
+```
diff --git a/examples/boot/stm32f7/build.rs b/examples/boot/stm32f7/build.rs
new file mode 100644
index 000000000..e1da69328
--- /dev/null
+++ b/examples/boot/stm32f7/build.rs
@@ -0,0 +1,37 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    if env::var("CARGO_FEATURE_DEFMT").is_ok() {
+        println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+    }
+}
diff --git a/examples/boot/stm32f7/flash-boot.sh b/examples/boot/stm32f7/flash-boot.sh
new file mode 100755
index 000000000..86074ffa3
--- /dev/null
+++ b/examples/boot/stm32f7/flash-boot.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+mv ../../../embassy-boot/stm32/memory.x ../../../embassy-boot/stm32/memory-old.x
+cp memory-bl.x ../../../embassy-boot/stm32/memory.x
+
+cargo flash --manifest-path ../../../embassy-boot/stm32/Cargo.toml --release --features embassy-stm32/stm32f767zi --chip STM32F767ZITx --target thumbv7em-none-eabihf
+
+rm ../../../embassy-boot/stm32/memory.x
+mv ../../../embassy-boot/stm32/memory-old.x ../../../embassy-boot/stm32/memory.x
diff --git a/examples/boot/stm32f7/memory-bl.x b/examples/boot/stm32f7/memory-bl.x
new file mode 100644
index 000000000..47f3f4d9b
--- /dev/null
+++ b/examples/boot/stm32f7/memory-bl.x
@@ -0,0 +1,18 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  FLASH                             : ORIGIN = 0x08000000, LENGTH = 256K
+  BOOTLOADER_STATE                  : ORIGIN = 0x08040000, LENGTH = 256K
+  ACTIVE                            : ORIGIN = 0x08080000, LENGTH = 256K
+  DFU                               : ORIGIN = 0x080c0000, LENGTH = 512K
+  RAM                         (rwx) : ORIGIN = 0x20000008, LENGTH = 368K + 16K
+}
+
+__bootloader_state_start = ORIGIN(BOOTLOADER_STATE) - ORIGIN(FLASH);
+__bootloader_state_end = ORIGIN(BOOTLOADER_STATE) + LENGTH(BOOTLOADER_STATE) - ORIGIN(FLASH);
+
+__bootloader_active_start = ORIGIN(ACTIVE) - ORIGIN(FLASH);
+__bootloader_active_end = ORIGIN(ACTIVE) + LENGTH(ACTIVE) - ORIGIN(FLASH);
+
+__bootloader_dfu_start = ORIGIN(DFU) - ORIGIN(FLASH);
+__bootloader_dfu_end = ORIGIN(DFU) + LENGTH(DFU) - ORIGIN(FLASH);
diff --git a/examples/boot/stm32f7/memory.x b/examples/boot/stm32f7/memory.x
new file mode 100644
index 000000000..1c5537d17
--- /dev/null
+++ b/examples/boot/stm32f7/memory.x
@@ -0,0 +1,15 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  BOOTLOADER                        : ORIGIN = 0x08000000, LENGTH = 256K
+  BOOTLOADER_STATE                  : ORIGIN = 0x08040000, LENGTH = 256K
+  FLASH                             : ORIGIN = 0x08080000, LENGTH = 256K
+  DFU                               : ORIGIN = 0x080c0000, LENGTH = 512K
+  RAM                         (rwx) : ORIGIN = 0x20000000, LENGTH = 368K + 16K
+}
+
+__bootloader_state_start = ORIGIN(BOOTLOADER_STATE) - ORIGIN(BOOTLOADER);
+__bootloader_state_end = ORIGIN(BOOTLOADER_STATE) + LENGTH(BOOTLOADER_STATE) - ORIGIN(BOOTLOADER);
+
+__bootloader_dfu_start = ORIGIN(DFU) - ORIGIN(BOOTLOADER);
+__bootloader_dfu_end = ORIGIN(DFU) + LENGTH(DFU) - ORIGIN(BOOTLOADER);
diff --git a/examples/boot/stm32f7/src/bin/a.rs b/examples/boot/stm32f7/src/bin/a.rs
new file mode 100644
index 000000000..ca154f0af
--- /dev/null
+++ b/examples/boot/stm32f7/src/bin/a.rs
@@ -0,0 +1,44 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy_boot_stm32::FirmwareUpdater;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::flash::Flash;
+use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
+use embassy_stm32::Peripherals;
+use embassy_traits::adapter::BlockingAsync;
+use panic_reset as _;
+
+#[cfg(feature = "defmt-rtt")]
+use defmt_rtt::*;
+
+static APP_B: &[u8] = include_bytes!("../../b.bin");
+
+#[embassy::main]
+async fn main(_s: embassy::executor::Spawner, p: Peripherals) {
+    let flash = Flash::unlock(p.FLASH);
+    let mut flash = BlockingAsync::new(flash);
+
+    let button = Input::new(p.PC13, Pull::Down);
+    let mut button = ExtiInput::new(button, p.EXTI13);
+
+    let mut led = Output::new(p.PB7, Level::Low, Speed::Low);
+    led.set_high();
+
+    let mut updater = FirmwareUpdater::default();
+    button.wait_for_rising_edge().await;
+    let mut offset = 0;
+    let mut buf: [u8; 256 * 1024] = [0; 256 * 1024];
+    for chunk in APP_B.chunks(256 * 1024) {
+        buf[..chunk.len()].copy_from_slice(chunk);
+        updater
+            .write_firmware(offset, &buf, &mut flash, 2048)
+            .await
+            .unwrap();
+        offset += chunk.len();
+    }
+    updater.update(&mut flash).await.unwrap();
+    led.set_low();
+    cortex_m::peripheral::SCB::sys_reset();
+}
diff --git a/examples/boot/stm32f7/src/bin/b.rs b/examples/boot/stm32f7/src/bin/b.rs
new file mode 100644
index 000000000..ed37137f5
--- /dev/null
+++ b/examples/boot/stm32f7/src/bin/b.rs
@@ -0,0 +1,27 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::Peripherals;
+use panic_reset as _;
+
+#[cfg(feature = "defmt-rtt")]
+use defmt_rtt::*;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    Timer::after(Duration::from_millis(300)).await;
+    let mut led = Output::new(p.PB7, Level::High, Speed::Low);
+    led.set_high();
+
+    loop {
+        led.set_high();
+        Timer::after(Duration::from_millis(500)).await;
+
+        led.set_low();
+        Timer::after(Duration::from_millis(500)).await;
+    }
+}
diff --git a/examples/boot/stm32h7/.cargo/config.toml b/examples/boot/stm32h7/.cargo/config.toml
new file mode 100644
index 000000000..8475e7f66
--- /dev/null
+++ b/examples/boot/stm32h7/.cargo/config.toml
@@ -0,0 +1,6 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace STM32F429ZITx with your chip as listed in `probe-run --list-chips`
+runner = "probe-run --chip STM32H743ZITx"
+
+[build]
+target = "thumbv7em-none-eabihf"
diff --git a/examples/boot/stm32h7/Cargo.toml b/examples/boot/stm32h7/Cargo.toml
new file mode 100644
index 000000000..1fd03906f
--- /dev/null
+++ b/examples/boot/stm32h7/Cargo.toml
@@ -0,0 +1,26 @@
+[package]
+authors = ["Ulf Lilleengen <[email protected]>"]
+edition = "2021"
+name = "embassy-boot-stm32f7-examples"
+version = "0.1.0"
+
+[dependencies]
+embassy = { version = "0.1.0", path = "../../../embassy", features = ["nightly"] }
+embassy-stm32 = { version = "0.1.0", path = "../../../embassy-stm32", features = ["unstable-traits", "nightly", "stm32h743zi", "time-driver-any", "exti"]  }
+embassy-boot-stm32 = { version = "0.1.0", path = "../../../embassy-boot/stm32" }
+embassy-traits = { version = "0.1.0", path = "../../../embassy-traits" }
+
+defmt = { version = "0.3", optional = true }
+defmt-rtt = { version = "0.3", optional = true }
+panic-reset = { version = "0.1.1" }
+embedded-hal = { version = "0.2.6" }
+
+cortex-m = "0.7.3"
+cortex-m-rt = "0.7.0"
+
+[features]
+defmt = [
+      "dep:defmt",
+      "embassy-stm32/defmt",
+      "embassy-boot-stm32/defmt",
+]
diff --git a/examples/boot/stm32h7/README.md b/examples/boot/stm32h7/README.md
new file mode 100644
index 000000000..1fdc305e6
--- /dev/null
+++ b/examples/boot/stm32h7/README.md
@@ -0,0 +1,29 @@
+# Examples using bootloader
+
+Example for STM32H7 demonstrating the bootloader. The example consists of application binaries, 'a'
+which allows you to press a button to start the DFU process, and 'b' which is the updated
+application.
+
+
+## Prerequisites
+
+* `cargo-binutils`
+* `cargo-flash`
+* `embassy-boot-stm32`
+
+## Usage
+
+```
+# Flash bootloader
+./flash-boot.sh
+# Build 'b'
+cargo build --release --bin b
+# Generate binary for 'b'
+cargo objcopy --release --bin b -- -O binary b.bin
+```
+
+# Flash `a` (which includes b.bin)
+
+```
+cargo flash --release --bin a --chip STM32H743ZITx
+```
diff --git a/examples/boot/stm32h7/build.rs b/examples/boot/stm32h7/build.rs
new file mode 100644
index 000000000..e1da69328
--- /dev/null
+++ b/examples/boot/stm32h7/build.rs
@@ -0,0 +1,37 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    if env::var("CARGO_FEATURE_DEFMT").is_ok() {
+        println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+    }
+}
diff --git a/examples/boot/stm32h7/flash-boot.sh b/examples/boot/stm32h7/flash-boot.sh
new file mode 100755
index 000000000..a910b7312
--- /dev/null
+++ b/examples/boot/stm32h7/flash-boot.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+mv ../../../embassy-boot/stm32/memory.x ../../../embassy-boot/stm32/memory-old.x
+cp memory-bl.x ../../../embassy-boot/stm32/memory.x
+
+cargo flash --manifest-path ../../../embassy-boot/stm32/Cargo.toml --release --features embassy-stm32/stm32f767zi --chip STM32H743ZITx --target thumbv7em-none-eabihf
+
+rm ../../../embassy-boot/stm32/memory.x
+mv ../../../embassy-boot/stm32/memory-old.x ../../../embassy-boot/stm32/memory.x
diff --git a/examples/boot/stm32h7/memory-bl.x b/examples/boot/stm32h7/memory-bl.x
new file mode 100644
index 000000000..c6f447d8b
--- /dev/null
+++ b/examples/boot/stm32h7/memory-bl.x
@@ -0,0 +1,18 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  FLASH                             : ORIGIN = 0x08000000, LENGTH = 128K
+  BOOTLOADER_STATE                  : ORIGIN = 0x08020000, LENGTH = 128K
+  ACTIVE                            : ORIGIN = 0x08040000, LENGTH = 128K
+  DFU                               : ORIGIN = 0x08100000, LENGTH = 512K
+  RAM                         (rwx) : ORIGIN = 0x24000000, LENGTH = 368K
+}
+
+__bootloader_state_start = ORIGIN(BOOTLOADER_STATE) - ORIGIN(FLASH);
+__bootloader_state_end = ORIGIN(BOOTLOADER_STATE) + LENGTH(BOOTLOADER_STATE) - ORIGIN(FLASH);
+
+__bootloader_active_start = ORIGIN(ACTIVE) - ORIGIN(FLASH);
+__bootloader_active_end = ORIGIN(ACTIVE) + LENGTH(ACTIVE) - ORIGIN(FLASH);
+
+__bootloader_dfu_start = ORIGIN(DFU) - ORIGIN(FLASH);
+__bootloader_dfu_end = ORIGIN(DFU) + LENGTH(DFU) - ORIGIN(FLASH);
diff --git a/examples/boot/stm32h7/memory.x b/examples/boot/stm32h7/memory.x
new file mode 100644
index 000000000..497a09e41
--- /dev/null
+++ b/examples/boot/stm32h7/memory.x
@@ -0,0 +1,15 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  BOOTLOADER                        : ORIGIN = 0x08000000, LENGTH = 128K
+  BOOTLOADER_STATE                  : ORIGIN = 0x08020000, LENGTH = 128K
+  FLASH                             : ORIGIN = 0x08040000, LENGTH = 256K
+  DFU                               : ORIGIN = 0x08100000, LENGTH = 512K
+  RAM                         (rwx) : ORIGIN = 0x24000000, LENGTH = 368K
+}
+
+__bootloader_state_start = ORIGIN(BOOTLOADER_STATE) - ORIGIN(BOOTLOADER);
+__bootloader_state_end = ORIGIN(BOOTLOADER_STATE) + LENGTH(BOOTLOADER_STATE) - ORIGIN(BOOTLOADER);
+
+__bootloader_dfu_start = ORIGIN(DFU) - ORIGIN(BOOTLOADER);
+__bootloader_dfu_end = ORIGIN(DFU) + LENGTH(DFU) - ORIGIN(BOOTLOADER);
diff --git a/examples/boot/stm32h7/src/bin/a.rs b/examples/boot/stm32h7/src/bin/a.rs
new file mode 100644
index 000000000..1f23a8bc2
--- /dev/null
+++ b/examples/boot/stm32h7/src/bin/a.rs
@@ -0,0 +1,44 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy_boot_stm32::FirmwareUpdater;
+use embassy_stm32::exti::ExtiInput;
+use embassy_stm32::flash::Flash;
+use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
+use embassy_stm32::Peripherals;
+use embassy_traits::adapter::BlockingAsync;
+use panic_reset as _;
+
+#[cfg(feature = "defmt-rtt")]
+use defmt_rtt::*;
+
+static APP_B: &[u8] = include_bytes!("../../b.bin");
+
+#[embassy::main]
+async fn main(_s: embassy::executor::Spawner, p: Peripherals) {
+    let flash = Flash::unlock(p.FLASH);
+    let mut flash = BlockingAsync::new(flash);
+
+    let button = Input::new(p.PC13, Pull::Down);
+    let mut button = ExtiInput::new(button, p.EXTI13);
+
+    let mut led = Output::new(p.PB14, Level::Low, Speed::Low);
+    led.set_high();
+
+    let mut updater = FirmwareUpdater::default();
+    button.wait_for_rising_edge().await;
+    let mut offset = 0;
+    let mut buf: [u8; 128 * 1024] = [0; 128 * 1024];
+    for chunk in APP_B.chunks(128 * 1024) {
+        buf[..chunk.len()].copy_from_slice(chunk);
+        updater
+            .write_firmware(offset, &buf, &mut flash, 2048)
+            .await
+            .unwrap();
+        offset += chunk.len();
+    }
+    updater.update(&mut flash).await.unwrap();
+    led.set_low();
+    cortex_m::peripheral::SCB::sys_reset();
+}
diff --git a/examples/boot/stm32h7/src/bin/b.rs b/examples/boot/stm32h7/src/bin/b.rs
new file mode 100644
index 000000000..233b93e1a
--- /dev/null
+++ b/examples/boot/stm32h7/src/bin/b.rs
@@ -0,0 +1,27 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::Peripherals;
+use panic_reset as _;
+
+#[cfg(feature = "defmt-rtt")]
+use defmt_rtt::*;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    Timer::after(Duration::from_millis(300)).await;
+    let mut led = Output::new(p.PB14, Level::High, Speed::Low);
+    led.set_high();
+
+    loop {
+        led.set_high();
+        Timer::after(Duration::from_millis(500)).await;
+
+        led.set_low();
+        Timer::after(Duration::from_millis(500)).await;
+    }
+}
diff --git a/examples/stm32f3/Cargo.toml b/examples/stm32f3/Cargo.toml
index 37f99fea2..e7a44c11e 100644
--- a/examples/stm32f3/Cargo.toml
+++ b/examples/stm32f3/Cargo.toml
@@ -19,3 +19,4 @@ panic-probe = { version = "0.3", features = ["print-defmt"] }
 futures = { version = "0.3.17", default-features = false, features = ["async-await"] }
 heapless = { version = "0.7.5", default-features = false }
 nb = "1.0.0"
+embedded-storage = "0.3.0"
diff --git a/examples/stm32f3/src/bin/blinky.rs b/examples/stm32f3/src/bin/blinky.rs
index b3643a26f..4b181a784 100644
--- a/examples/stm32f3/src/bin/blinky.rs
+++ b/examples/stm32f3/src/bin/blinky.rs
@@ -15,7 +15,7 @@ use panic_probe as _;
 async fn main(_spawner: Spawner, p: Peripherals) {
     info!("Hello World!");
 
-    let mut led = Output::new(p.PE12, Level::High, Speed::Low);
+    let mut led = Output::new(p.PA5, Level::High, Speed::Low);
 
     loop {
         info!("high");
diff --git a/examples/stm32f3/src/bin/flash.rs b/examples/stm32f3/src/bin/flash.rs
new file mode 100644
index 000000000..3890f0514
--- /dev/null
+++ b/examples/stm32f3/src/bin/flash.rs
@@ -0,0 +1,43 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::{info, unwrap};
+use embassy::executor::Spawner;
+use embassy_stm32::flash::Flash;
+use embassy_stm32::Peripherals;
+use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
+
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello Flash!");
+
+    const ADDR: u32 = 0x26000;
+
+    let mut f = Flash::unlock(p.FLASH);
+
+    info!("Reading...");
+    let mut buf = [0u8; 8];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Erasing...");
+    unwrap!(f.erase(ADDR, ADDR + 2048));
+
+    info!("Reading...");
+    let mut buf = [0u8; 8];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read after erase: {=[u8]:x}", buf);
+
+    info!("Writing...");
+    unwrap!(f.write(ADDR, &[1, 2, 3, 4, 5, 6, 7, 8]));
+
+    info!("Reading...");
+    let mut buf = [0u8; 8];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+    assert_eq!(&buf[..], &[1, 2, 3, 4, 5, 6, 7, 8]);
+}
diff --git a/examples/stm32f7/Cargo.toml b/examples/stm32f7/Cargo.toml
index 09a06aa7f..ce0a6d48f 100644
--- a/examples/stm32f7/Cargo.toml
+++ b/examples/stm32f7/Cargo.toml
@@ -22,6 +22,7 @@ heapless = { version = "0.7.5", default-features = false }
 nb = "1.0.0"
 rand_core = "0.6.3"
 critical-section = "0.2.3"
+embedded-storage = "0.3.0"
 
 [dependencies.smoltcp]
 version = "0.8.0"
diff --git a/examples/stm32f7/src/bin/flash.rs b/examples/stm32f7/src/bin/flash.rs
new file mode 100644
index 000000000..9eb8e4b94
--- /dev/null
+++ b/examples/stm32f7/src/bin/flash.rs
@@ -0,0 +1,59 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::{info, unwrap};
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::flash::Flash;
+use embassy_stm32::Peripherals;
+use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
+
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello Flash!");
+
+    const ADDR: u32 = 0x8_0000;
+
+    // wait a bit before accessing the flash
+    Timer::after(Duration::from_millis(300)).await;
+
+    let mut f = Flash::unlock(p.FLASH);
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Erasing...");
+    unwrap!(f.erase(ADDR, ADDR + 256 * 1024));
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read after erase: {=[u8]:x}", buf);
+
+    info!("Writing...");
+    unwrap!(f.write(
+        ADDR,
+        &[
+            1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+            25, 26, 27, 28, 29, 30, 31, 32
+        ]
+    ));
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+    assert_eq!(
+        &buf[..],
+        &[
+            1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+            25, 26, 27, 28, 29, 30, 31, 32
+        ]
+    );
+}
diff --git a/examples/stm32h7/Cargo.toml b/examples/stm32h7/Cargo.toml
index 419bbec31..8906a1d0b 100644
--- a/examples/stm32h7/Cargo.toml
+++ b/examples/stm32h7/Cargo.toml
@@ -27,6 +27,7 @@ rand_core = "0.6.3"
 critical-section = "0.2.5"
 micromath = "2.0.0"
 stm32-fmc = "0.2.4"
+embedded-storage = "0.3.0"
 
 [dependencies.smoltcp]
 version = "0.8.0"
diff --git a/examples/stm32h7/src/bin/flash.rs b/examples/stm32h7/src/bin/flash.rs
new file mode 100644
index 000000000..b008c0884
--- /dev/null
+++ b/examples/stm32h7/src/bin/flash.rs
@@ -0,0 +1,58 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::{info, unwrap};
+use defmt_rtt as _; // global logger
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::flash::Flash;
+use embassy_stm32::Peripherals;
+use embedded_storage::nor_flash::{NorFlash, ReadNorFlash};
+use panic_probe as _;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) {
+    info!("Hello Flash!");
+
+    const ADDR: u32 = 0x08_0000;
+
+    // wait a bit before accessing the flash
+    Timer::after(Duration::from_millis(300)).await;
+
+    let mut f = Flash::unlock(p.FLASH);
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+
+    info!("Erasing...");
+    unwrap!(f.erase(ADDR, ADDR + 128 * 1024));
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read after erase: {=[u8]:x}", buf);
+
+    info!("Writing...");
+    unwrap!(f.write(
+        ADDR,
+        &[
+            1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+            25, 26, 27, 28, 29, 30, 31, 32
+        ]
+    ));
+
+    info!("Reading...");
+    let mut buf = [0u8; 32];
+    unwrap!(f.read(ADDR, &mut buf));
+    info!("Read: {=[u8]:x}", buf);
+    assert_eq!(
+        &buf[..],
+        &[
+            1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+            25, 26, 27, 28, 29, 30, 31, 32
+        ]
+    );
+}
diff --git a/stm32-data b/stm32-data
-Subproject 9abfa9d2b51e6071fdc7e680b4a171e4fa20c2f
+Subproject b2d7a9f5de7dc3ae17c87c1ff94e13a822d18e7