internal bootloader through bluetooth (firmware update)

lukasz239955 · ‎2010-05-25

Posted on May 25, 2010 at 10:17

chikos332 · ‎2011-05-17

Posted on May 17, 2011 at 13:52

Hi,

If you receive 0x1F (instead of ACK 0x79) then it probably means that:

- The Baudrate you are using is not suitable (too high or too low)

- Or You are not waiting enough time after sending the 0x7F

- Or you are not using the correct data format (I think: 8-bit, No parity, 1 Stop bit, but check by yourself AN3155)

There are some similar topics in this forum, try to check them as well.

Cheers.

lukasz239955 · ‎2011-05-17

Posted on May 17, 2011 at 13:52

Thanks for reply.

Took me a day of fighting but I did it.

If anybody wants to try heres some hints:

- baudrate should be set 115200, 8Even1 , so parity is EVEN

- bt modules usually work at default baudrate 115200 but no parity, you need to change bt config as well

- the asm code (taken from other topic on this forum) works but before you have to turn off interrupts and uart1 completely.

- I couldn't upload firmware from device only download to device (enough for me)

- you have to do additnioal reset (NVIC_GenerateSystemReset() is good enough) if you want to enter bootloader again - otherwise it will hang and break (that happened in my case)