FLASH: Make sure that the flash unlock register state is cleared before trying to unlock the flash.

2013-02-26 15:25:55 -08:00
parent bc853e7ebd
commit 5e7ec39440
3 changed files with 17 additions and 0 deletions
--- a/lib/stm32/f1/flash.c
+++ b/lib/stm32/f1/flash.c
@@ -52,6 +52,9 @@ void flash_set_ws(u32 ws)

 void flash_unlock(void)
 {
+	/* Clear the unlock state. */
+	FLASH_CR |= FLASH_CR_LOCK;
+
 	/* Authorize the FPEC access. */
 	FLASH_KEYR = FLASH_KEYR_KEY1;
 	FLASH_KEYR = FLASH_KEYR_KEY2;