cpu/stm32_common/periph: don't lock if flash is already locked

RIOT-OS · May 16, 2018 · 6e0871d · 6e0871d
1 parent 9c09a21
commit 6e0871d
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/cpu/stm32_common/periph/flashpage.c b/cpu/stm32_common/periph/flashpage.c
@@ -73,8 +73,10 @@ static void _unlock(void)
 
 static void _lock(void)
 {
-    DEBUG("[flashpage] locking the flash module\n");
-    CNTRL_REG |= CNTRL_REG_LOCK;
+    if (!(CNTRL_REG & CNTRL_REG_LOCK)) {
+        DEBUG("[flashpage] locking the flash module\n");
+        CNTRL_REG |= CNTRL_REG_LOCK;
+    }
 }
 
 static void _erase_page(void *page_addr)