Merge pull request #12726 from artokin/stm32f4_sleep_solution

0xc0170 · web-flow · commit c5c211388c30 · 2020-04-01T11:32:06.000+02:00
feature-wisun: Add fix for STM32F4 hardfault in sleep mode
diff --git a/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_pwr.c b/targets/TARGET_STM/TARGET_STM32F4/device/stm32f4xx_hal_pwr.c
@@ -391,7 +391,10 @@ void HAL_PWR_EnterSLEEPMode(uint32_t Regulator, uint8_t SLEEPEntry)
   if(SLEEPEntry == PWR_SLEEPENTRY_WFI)
   {   
     /* Request Wait For Interrupt */
-    __NOP();
+    __WFI();
+    __NOP(); // Workaround for STM32F4 errata
+    __NOP(); // see chapter 2.1.3 - Debugging Sleep/Stop mode with WFE/WFI entry
+    __NOP(); // https://www.st.com/resource/en/errata_sheet/dm00037591-stm32f405-407xx-and-stm32f415-417xx-device-limitations-stmicroelectronics.pdf
   }
   else
   {

Original file line number	Diff line number	Diff line change
`@@ -391,7 +391,10 @@ void HAL_PWR_EnterSLEEPMode(uint32_t Regulator, uint8_t SLEEPEntry)`
`391`	`391`	`if(SLEEPEntry == PWR_SLEEPENTRY_WFI)`
`392`	`392`	`{`
`393`	`393`	`/* Request Wait For Interrupt */`
`394`		`- __NOP();`
	`394`	`+ __WFI();`
	`395`	`+ __NOP(); // Workaround for STM32F4 errata`
	`396`	`+ __NOP(); // see chapter 2.1.3 - Debugging Sleep/Stop mode with WFE/WFI entry`
	`397`	`+ __NOP(); // https://www.st.com/resource/en/errata_sheet/dm00037591-stm32f405-407xx-and-stm32f415-417xx-device-limitations-stmicroelectronics.pdf`
`395`	`398`	`}`
`396`	`399`	`else`
`397`	`400`	`{`