stcgal
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grigorig
Doesn't work with STC89C52, firmware version 7.2.5C
stcgal's stc89 mode only works with STC89C52 4.3C version. STC89C52 's recent version can't be recognized by stcgal, it shows up an error message:
Waiting for MCU, please cycle power: done Protocol detected: stc89 Protocol error: packet checksum mismatch Disconnected!
The new STC89 protocol seems to uses 8E1 line coding to transmit data.
As luck i have two STC, one is STC89C52 7.2.5C, another is STC90C516RD+ 4.3C. the experiment show that STC90C516RD+ is all right, the STC89C52 show the same error. the os is macOS High Sierra 10.13.6.
It's work to change extract_payload function in protocols.py. form
packet_csum = packet[-2]
calc_csum = sum(packet[2:-2]) & 0xff
to
packet_csum = packet[-2] + (packet[-3] << 8)
calc_csum = sum(packet[2:-3]) & 0xffff
refer to： https://github.com/azman/my1stcflash/blob/master/src/my1stc.c
and use
stcgal.py -P stc12 -p /dev/tty.wchusbserial14310 -D
is work too
soory for my poor english
Both of these snippets are the same, but I think I know what you mean. :) It should be easy enough to add a special case for newer bootloader versions. Feel free to submit a PR. If I have some free time, I might be able to do it as well, but I cannot test it.
I can confirm that using -P stc12 for the 89C52 I got on my development board described in https://github.com/kenyapcomau/QX-mini51 is a valid workaround. Hope this can be automatically detected in future.
@grigorig Only changing extract_payload will not work, 7.2.5C and the old version of the communication protocol are completely different
Yes, that is why I reverted it for now. It looks like newer STC89C52 use an stc12-like protocol and I'd like to avoid the code duplication if possible. I ordered some chips and hopefully I'll get these new ones.
