MicroPython Forum

I don't really know how to choose another polynome for 8 bits
I thought this could be it: x^8+ x^6 + x^4 + x^3 + 1

But I don't see how I get to the polynome byte from that

That's nice but I'm not sure what exactly to do with it. Can it replace the table I'm using? It was created for crc8, does that code work with tables for 6 or 4 too? Sorry I'm not too familiar with how crc works, I just use it anyway

Thanks for the suggestion but for bytearrays of 40 bytes that code needed twice the time of the lookup table. (1ms vs 2ms)

awesome project! Thanks for sharing it!

Thanks that was a good tip. I found one with a lookup table and stripped it down for micropyhton: _table = b'\x00\x07\x0e\t\x1c\x1b\x12\x158?61$#*-pw~ylkbeHOFATSZ]\xe0\xe7\xee\xe9\xfc\xfb\xf2\xf5\xd8\xdf\xd6\xd1\xc4\xc3\xca\xcd\x90\x97\x9e\x99\x8c\x8b\x82\x85\xa8\xaf\xa6\xa1\xb4\xb3\xba\xbd\xc7\xc0\...

I'm currently using a crc8 python implementation on the esp32 but it easily takes 1-4ms to calculate the crc. So I'm wondering if there is a better option in micropython for a simple crc/checksum for UART communications. Current code: def crc8(*args, initial_value=0): crc = initial_value for datagra...

That is a very nice first version! By the way: I actually created a framework over the last few years with the exact same goal, integrating devices with home-assistant using mqtt_as with mqtt autodiscovery. It is more complex and powerful than yours, so maybe you can find some inspiration or some co...

Does your module use psram? My esp32 with psram is painfully slow when it comes to loading modules. But 5 seconds does seem a little long but might not be unusal. My whole project consists of .mpy files and on start it loads up to 7 files and it takes a while..

That's good news. However, personally any module without uasyncio is unusable to me and the 1M build should have enough space left for uasyncio even if other modules need to go or the flash side reduced. In the forum we often refer to using uasyncio for programming, I think it is a core module that ...

Oh I must have missed the information that you use a 1MB firmware. But interesting that the old uasyncio is part of that firmware, that does indeed make no sense at all. So if you want to use the new uasyncio with the 1MB module, you need to build the firmware yourself. you can take a look at my scr...