fix(stm32h7/flash): enhance resilience to program sequence errors (pgserr)

1 files changed, 6 insertions, 2 deletions

diff --git a/embassy-stm32/src/flash/h7.rs b/embassy-stm32/src/flash/h7.rs
index ae395d568..743925e17 100644
--- a/embassy-stm32/src/flash/h7.rs
+++ b/embassy-stm32/src/flash/h7.rs
@@ -77,12 +77,12 @@ pub(crate) unsafe fn blocking_write(start_address: u32, buf: &[u8; WRITE_SIZE])
         }
     }
 
-    bank.cr().write(|w| w.set_pg(false));
-
     cortex_m::asm::isb();
     cortex_m::asm::dsb();
     fence(Ordering::SeqCst);
 
+    bank.cr().write(|w| w.set_pg(false));
+
     res.unwrap()
 }
 
@@ -100,6 +100,10 @@ pub(crate) unsafe fn blocking_erase_sector(sector: &FlashSector) -> Result<(), E
         w.set_start(true);
     });
 
+    cortex_m::asm::isb();
+    cortex_m::asm::dsb();
+    fence(Ordering::SeqCst);
+
     let ret: Result<(), Error> = blocking_wait_ready(bank);
     bank.cr().modify(|w| w.set_ser(false));
     bank_clear_all_err(bank);