STMH7 ETH_DMAMR_SWR fails

[BengofEtech]

Hey,

i got a specific Problem with the STM32H7 Ethernet, sometimes when performing

 SET_BIT(heth->Instance->DMAMR, ETH_DMAMR_SWR);
 
 /* Get tick */
 tickstart = HAL_GetTick();
 
 /* Wait for software reset */
 uint8_t force_reset = 0;
 while (READ_BIT(heth->Instance->DMAMR, ETH_DMAMR_SWR) > 0U)
 {
 if(((HAL_GetTick() - tickstart ) > ETH_SWRESET_TIMEOUT))
 {
 /* Set Error Code */
 heth->ErrorCode = HAL_ETH_ERROR_TIMEOUT;
 /* Set State as Error */
 heth->gState = HAL_ETH_STATE_ERROR;
 /* Return Error */
 return HAL_ERROR;
 break;
 }
 }

The error gets detectet, so ETH_DMAMR_SWR doesnt get activated within this timeout period. Is there aother way to reset the ETH Controller except from restarting the whole mcu?

I tried __HAL_RCC_ETH1MAC_FORCE_RESET but it didnt work out.

[BengofEtech]

okay much more interesting:

 /* Get tick */
 tickstart = HAL_GetTick();
 
 /* Wait for software reset */
 uint8_t force_reset = 0;
 while (READ_BIT(heth->Instance->DMAMR, ETH_DMAMR_SWR) > 0U)
 {
 if(((HAL_GetTick() - tickstart ) > ETH_SWRESET_TIMEOUT))
 {
 /* Set Error Code */
 heth->ErrorCode = HAL_ETH_ERROR_TIMEOUT;
 /* Set State as Error */
 heth->gState = HAL_ETH_STATE_ERROR;
 /* Return Error */
 force_reset = 1;
 break;
 }
 }
 
 
 tickstart = HAL_GetTick();
 if(force_reset)
 {
//	 tickstart = HAL_GetTick();
	 __HAL_RCC_ETH1MAC_FORCE_RESET();
	 HAL_Delay(100);
	 __HAL_RCC_ETH1MAC_RELEASE_RESET();
	 HAL_Delay(100);
	 SET_BIT(heth->Instance->DMAMR, ETH_DMAMR_SWR);
	 while (READ_BIT(heth->Instance->DMAMR, ETH_DMAMR_SWR) > 0U)
	 {
	 if(((HAL_GetTick() - tickstart ) > ETH_SWRESET_TIMEOUT))
	 {
	 /* Set Error Code */
	 heth->ErrorCode = HAL_ETH_ERROR_TIMEOUT;
	 /* Set State as Error */
	 heth->gState = HAL_ETH_STATE_ERROR;
	 /* Return Error */
 
	 return HAL_ERROR;
	 }
	 }
 }

when optimising AND uncomment the tickstart, the whole programm wont run correctly. Anyone expirienced things like that?

[BengofEtech]

there seems something wrong with data alligmnent. cant imagine, it could be something written on the flash. any experiences?

as far as i can tell, usually adding non related code in flash should not interfere with the programs ability to function, which is clearly the case here.

[JackSparrow]

I have run into the same issue with my STM32H753 MCU(https://community.st.com/t5/stm32-mcus-products/stm32h753-ethernet-initialization-failure/td-p/602033)

Were you able to fix this issue?

[MBeau]

Same issue here on a H747 DISC0. Same c-code as yesterday, starting my program today and constantly running into this behaviour.

This line of code triggers the Hardfault_Handler()

SET_BIT(heth->Instance->DMAMR, ETH_DMAMR_SWR);

But when debugging I noticed that this function is called already by MX_ETH_Init (I guess so). So the SET_BIT function was called already and is running into the HardFault_Handler, when called the second time.
After commenting out "HAL_ETH_Init(&heth)" in my main.c, I didn't run into the error any more :)

 

Still wondering why I didn't run into the HardFault_Handler yesterday, when HAL_ETH_Init" was called twice (1x MX Init + 1x main.c)

Hope this will help anyone :)
Cheers