mcu/stm32: Fix hal_nvreg_write for STM32F1

Writing to backup registers requires enabling BPK_CLK. For read it does not seem to be needed. Signed-off-by: Jerzy Kasenberg <[email protected]>
kasjer · Jun 8, 2024 · 23196d5 · 23196d5
1 parent 3ea5f71
commit 23196d5
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/hw/mcu/stm/stm32_common/src/hal_nvreg.c b/hw/mcu/stm/stm32_common/src/hal_nvreg.c
@@ -39,9 +39,15 @@ hal_nvreg_write(unsigned int reg, uint32_t val)
 #if PWR_ENABLED
     RTC_HandleTypeDef hrtc = { .Instance = RTC };
     if (reg < HAL_NVREG_MAX) {
+#if defined(__HAL_RCC_BKP_CLK_ENABLE)
+        __HAL_RCC_BKP_CLK_ENABLE();
+#endif
         HAL_PWR_EnableBkUpAccess();
         HAL_RTCEx_BKUPWrite(&hrtc, reg, val);
         HAL_PWR_DisableBkUpAccess();
+#if defined(__HAL_RCC_BKP_CLK_DISABLE)
+        __HAL_RCC_BKP_CLK_DISABLE();
+#endif
     }
 #endif
 }