how to transfer hex file between two stm32 boards. I am trying to transfer the hex file which is present in one stm32 board and i need to transfer it to another stm32 board via uart ?

[sra]

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[Tesla DeLorean]

The MCU isn't holding the .HEX file like that, the binary data it is describing is held as data in memory.

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Y​ou could use standard serial transfer methods, say like XMODEM, to move it as a block of data. You could also have it "print" the data in a more familiar Intel or Motorola. HEX format if you're more comfortable with handling that. There will be about 2.5x the data.

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On receiving side you'd take the data and use the HAL FLASH functions to write the data into memory.