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stm32 flash: check lock bit before unlocking

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It hardfaults if already unlocked flash is unlocked again.
This commit is contained in:
Andres Vahter
2023-10-10 12:48:21 +03:00
parent 904f1cfc7a
commit 3616d68aaa
7 changed files with 40 additions and 20 deletions
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12
embassy-stm32/src/flash/h7.rs
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@ -26,11 +26,15 @@ pub(crate) unsafe fn lock() {
}
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 pac::FLASH.bank(0).cr().read().lock() {
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));
if pac::FLASH.bank(1).cr().read().lock() {
pac::FLASH.bank(1).keyr().write(|w| w.set_keyr(0x4567_0123));
pac::FLASH.bank(1).keyr().write(|w| w.set_keyr(0xCDEF_89AB));
}
}
}