stm32 flash: check lock bit before unlocking
It hardfaults if already unlocked flash is unlocked again.
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@ -28,17 +28,23 @@ pub(crate) unsafe fn lock() {
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pub(crate) unsafe fn unlock() {
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#[cfg(any(flash_wl, flash_wb, flash_l4))]
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{
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pac::FLASH.keyr().write(|w| w.set_keyr(0x4567_0123));
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pac::FLASH.keyr().write(|w| w.set_keyr(0xCDEF_89AB));
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if pac::FLASH.cr().read().lock() {
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pac::FLASH.keyr().write(|w| w.set_keyr(0x4567_0123));
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pac::FLASH.keyr().write(|w| w.set_keyr(0xCDEF_89AB));
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}
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}
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#[cfg(any(flash_l0, flash_l1))]
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{
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pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x89ABCDEF));
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pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x02030405));
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if pac::FLASH.pecr().read().pelock() {
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pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x89ABCDEF));
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pac::FLASH.pekeyr().write(|w| w.set_pekeyr(0x02030405));
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}
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pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x8C9DAEBF));
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pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x13141516));
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if pac::FLASH.pecr().read().prglock() {
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pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x8C9DAEBF));
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pac::FLASH.prgkeyr().write(|w| w.set_prgkeyr(0x13141516));
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}
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}
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}
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