Need information about Bootloader via USB-COM (virtual com port) for STM32F103

[alireza nazem]

Posted on May 07, 2018 at 11:31

Hello everyone, 

Does anybody know any available bootloader via usb-com (virtual com port) for STM32F103 series? or any written codes for it? or if not please instruct me how to start writing my own codes. frankly i am new here and just made my very first codes. I used UART1 to upload my codes to MCU but I need to use USB-COM for firmware update. Thank you   

[Tesla DeLorean]

Posted on May 07, 2018 at 15:39

Should be some IAP examples for the EVAL boards that should be portable to the board you are using.

For USB connectivity, direct to the part, consider DFU

[alireza nazem]

Posted on May 07, 2018 at 15:52

Hi, Thanks replying. actually I am asked to develop via USB virtual COM and not DFU for some reasons. am I on the right path if I learn how to read and write to the flash? what else do i need to know ? Thanks in advance   

[Tesla DeLorean]

Posted on May 07, 2018 at 17:43

I would likely buffer data provided in the USB interrupt, and then flash in a separate task/thread. Writing and erasing flash can stall the processor, and you'd want to avoid doing that in an interrupt, and on a device will real-time expectations.

The IAP implementation uses Y-Modem to manage blocks of data sent from a Terminal application running on a PC.