The MCU I'm using is STM32F743H7IIT6.
I am trying to perform firmware update via the USART bootloader protocol. (AN3155
Application note) Everything was working fine with many .bin files until one .bin file crashed the update. When I debuged I found a command that doesn't receive any response.
31 ce
good ACK received
080163006a
(address) good ACK received
5bed5f0108ed5f0108ffffffffffffffffffffffffffff000001004153434949000000000000000000000000000000000000000000000000000000415343494900000000000000000000000000000000000000000000000000000000005a
Nothing is received back. (5b is the number of Bytes followed by 92 bytes and 5a is the checksum)
I tried with 59, 5a, 5b, 5c, 5d as the number of Bytes and every time nothing
I tried writing 03 ff ff ff ff 03 on the same address and it's working.
Also tried longer Byte Arrays with ff number of bytes and they work.
(I didn't bother very much with the checksum, as it should return NACK if the checksum was bad)
Any help appreciated,
Thanks
Update 1:
I've now tried the same Byte Array with incorrect checksum, it is giving me NACK
Update2:
Adding 4 bytes works
5fed5f0108ed5f0108ffffffffffffffffffffffffffff00000100415343494900000000000000000000000000000000000000000000000000000041534349490000000000000000000000000000000000000000000000000000000000000000005e
Removing 4 bytes doesn't work
57ed5f0108ed5f0108ffffffffffffffffffffffffffff00000100415343494900000000000000000000000000000000000000000000000000000041534349490000000000000000000000000000000000000000000000000056
