STM32G4: USART buffer overrun during Flash Erase operation

[harisuvarna]

Hi ,

I am using STM32G4 to receive USART data from external interface and USART buffer overrun when USART interrupt conflicts with Flash Erase operation. 

As mentioned in STM32G4 Reference manual , in single bank mode, any read operation while writing/erasing flash 

stalls the bus until current flash operation is complete. To mitigate this performed following,

• Moved ISR handler and subroutines invoked inside ISR to SRAM
• Moved Interrupt Vector table to SRAM     

After all these changes , USART buffer still overruns when it conflicts with Flash erase operation

Request you to share your views.

Regards,

Hareesha

[Karl Yamashita]

So there must be some command to have the STM32G4 to erase the flash. Do you not return and ack to let the external device start sending packets of data?