UART Rx Interrupt Routine for Variable-Length Data on STM32F072RBT6

[shyamparmar]

 

 

 

[Andrew Neil]

Set the receive size to 1 - receive 1 byte at a time.

Doing it with HAL_UART_Receive_IT is quite an overhead, but it can work - depends on how fast you want/need it to be...

[shyamparmar]

@Andrew Neil  Thank you for the suggestion to receive 1 byte at a time using HAL_UART_Receive_IT. I understand that this approach can add overhead, but it might work for my use case. However, I’m still unclear about how to determine the end of the file.

Since I will be receiving the file byte-by-byte, how can I know when I have received the complete binary file so I can proceed with writing the data to flash and jumping to the application?

[Andrew Neil]

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@shyamparmar wrote:

I’m still unclear about how to determine the end of the file.

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well, that's an entirely different question - nothing to do with the UART handling of the bytes!

As @Tesla DeLorean suggested, you will need some sort of protocol to handle that - X/Y/Z-modem are specifically designed for this very application, and are widely supported by terminal software.

https://web.cecs.pdx.edu/~rootd/catdoc/guide/TheGuide_226.html

https://en.wikipedia.org/wiki/XMODEM

https://en.wikipedia.org/wiki/YMODEM

https://cambium.inria.fr/~doligez/zmodem/ymodem.txt 

ST Use Y-modem in their IAP Application Note - AN4657, STM32 in-application programming (IAP) using the USART:

https://www.st.com/resource/en/application_note/an4657-stm32-inapplication-programming-iap-using-the-usart-stmicroelectronics.pdf

 

[Tesla DeLorean]

You'll need to manage as bytes or blocks, or create circular/ring buffers where you consume the data elsewhere. 

For files, where size is imparted, look at Y-MODEM 

[zhaowhong]

I just wrote this program a few days ago. You should use DMA to receive data.Regularly query data and receive data for splicing。And my bin file transfer added crc check