stm32/flash: add stm32f2, stm32h5 flash driver

2 files changed, 180 insertions, 2 deletions

diff --git a/embassy-stm32/src/flash/h5.rs b/embassy-stm32/src/flash/h5.rs
new file mode 100644
index 000000000..9e131ca2b
--- /dev/null
+++ b/embassy-stm32/src/flash/h5.rs
@@ -0,0 +1,177 @@
+use core::ptr::write_volatile;
+use core::sync::atomic::{fence, Ordering};
+
+use super::{FlashRegion, FlashSector, FLASH_REGIONS, WRITE_SIZE};
+use crate::flash::Error;
+use crate::pac;
+
+pub(crate) const fn is_default_layout() -> bool {
+    true
+}
+
+// const fn is_dual_bank() -> bool {
+//     FLASH_REGIONS.len() >= 2
+// }
+
+pub(crate) fn get_flash_regions() -> &'static [&'static FlashRegion] {
+    &FLASH_REGIONS
+}
+
+pub(crate) unsafe fn lock() {
+    if !pac::FLASH.nscr().read().lock() {
+        pac::FLASH.nscr().modify(|r| {
+            r.set_lock(true);
+        });
+    }
+}
+
+pub(crate) unsafe fn unlock() {
+    // TODO: check locked first
+    while pac::FLASH.nssr().read().bsy() {
+        #[cfg(feature = "defmt")]
+        defmt::trace!("busy")
+    }
+
+    // only unlock if locked to begin with
+    if pac::FLASH.nscr().read().lock() {
+        pac::FLASH.nskeyr().write_value(0x4567_0123);
+        pac::FLASH.nskeyr().write_value(0xCDEF_89AB);
+    }
+}
+
+pub(crate) unsafe fn enable_blocking_write() {
+    assert_eq!(0, WRITE_SIZE % 4);
+}
+
+pub(crate) unsafe fn disable_blocking_write() {}
+
+pub(crate) unsafe fn blocking_write(start_address: u32, buf: &[u8; WRITE_SIZE]) -> Result<(), Error> {
+    // // We cannot have the write setup sequence in begin_write as it depends on the address
+    // let bank = if start_address < BANK1_REGION.end() {
+    //     pac::FLASH.bank(0)
+    // } else {
+    //     pac::FLASH.bank(1)
+    // };
+
+    cortex_m::asm::isb();
+    cortex_m::asm::dsb();
+    fence(Ordering::SeqCst);
+
+    clear_all_err();
+
+    pac::FLASH.nscr().write(|w| {
+        w.set_pg(true);
+        // w.set_psize(2); // 32 bits at once
+    });
+
+    let mut res = None;
+    let mut address = start_address;
+    // TODO: see write size
+    for val in buf.chunks(4) {
+        write_volatile(address as *mut u32, u32::from_le_bytes(unwrap!(val.try_into())));
+        address += val.len() as u32;
+
+        res = Some(blocking_wait_ready().map_err(|e| {
+            error!("write err");
+            e
+        }));
+        pac::FLASH.nssr().modify(|w| {
+            if w.eop() {
+                w.set_eop(true);
+            }
+        });
+        if unwrap!(res).is_err() {
+            break;
+        }
+    }
+
+    cortex_m::asm::isb();
+    cortex_m::asm::dsb();
+    fence(Ordering::SeqCst);
+
+    pac::FLASH.nscr().write(|w| w.set_pg(false));
+
+    unwrap!(res)
+}
+
+pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), Error> {
+    // pac::FLASH.wrp2r_cur().read().wrpsg()
+    // TODO: write protection check
+    if pac::FLASH.nscr().read().lock() == true {
+        error!("flash locked");
+    }
+
+    loop {
+        let sr = pac::FLASH.nssr().read();
+        if !sr.bsy() && !sr.dbne() {
+            break;
+        }
+    }
+    clear_all_err();
+
+    pac::FLASH.nscr().modify(|r| {
+        // TODO: later check bank swap
+        r.set_bksel(match sector.bank {
+            crate::flash::FlashBank::Bank1 => stm32_metapac::flash::vals::NscrBksel::B_0X0,
+            crate::flash::FlashBank::Bank2 => stm32_metapac::flash::vals::NscrBksel::B_0X1,
+        });
+        r.set_snb(sector.index_in_bank);
+        r.set_ser(true);
+    });
+
+    pac::FLASH.nscr().modify(|r| {
+        r.set_strt(true);
+    });
+
+    cortex_m::asm::isb();
+    cortex_m::asm::dsb();
+    fence(Ordering::SeqCst);
+
+    let ret: Result<(), Error> = blocking_wait_ready().map_err(|e| {
+        error!("erase err");
+        e
+    });
+
+    pac::FLASH.nscr().modify(|w| w.set_ser(false));
+    clear_all_err();
+    ret
+}
+
+pub(crate) unsafe fn clear_all_err() {
+    pac::FLASH.nssr().modify(|_| {})
+}
+
+unsafe fn blocking_wait_ready() -> Result<(), Error> {
+    loop {
+        let sr = pac::FLASH.nssr().read();
+
+        if !sr.bsy() {
+            if sr.optchangeerr() {
+                error!("optchangeerr");
+                return Err(Error::Prog);
+            }
+            if sr.obkwerr() {
+                error!("obkwerr");
+                return Err(Error::Seq);
+            }
+            if sr.obkerr() {
+                error!("obkerr");
+                return Err(Error::Seq);
+            }
+            if sr.incerr() {
+                error!("incerr");
+                return Err(Error::Unaligned);
+            }
+            if sr.strberr() {
+                error!("strberr");
+                return Err(Error::Parallelism);
+            }
+            if sr.wrperr() {
+                error!("protected");
+                return Err(Error::Protected);
+            }
+
+            return Ok(());
+        }
+    }
+}
diff --git a/embassy-stm32/src/flash/mod.rs b/embassy-stm32/src/flash/mod.rs
index d64a1c28a..88fe6a291 100644
--- a/embassy-stm32/src/flash/mod.rs
+++ b/embassy-stm32/src/flash/mod.rs
@@ -101,13 +101,14 @@ pub enum FlashBank {
 #[cfg_attr(flash_h7, path = "h7.rs")]
 #[cfg_attr(flash_h7ab, path = "h7.rs")]
 #[cfg_attr(flash_u5, path = "u5.rs")]
+#[cfg_attr(flash_h5, path = "h5.rs")]
 #[cfg_attr(flash_h50, path = "h50.rs")]
 #[cfg_attr(flash_u0, path = "u0.rs")]
 #[cfg_attr(
     not(any(
         flash_l0, flash_l1, flash_l4, flash_l5, flash_wl, flash_wb, flash_f0, flash_f1, flash_f2, flash_f3, flash_f4,
-        flash_f7, flash_g0, flash_g0, flash_g4c2, flash_g4c3, flash_g4c4, flash_h7, flash_h7ab, flash_u5, flash_h50,
-        flash_u0
+        flash_f7, flash_g0, flash_g4c2, flash_g4c3, flash_g4c4, flash_h7, flash_h7ab, flash_u5, flash_h50, flash_u0,
+        flash_h5,
     )),
     path = "other.rs"
 )]