[riot-notifications] [RIOT-OS/RIOT] tests/candev: add mcp2515 + driver/mcp2515: add driver (#13624)

Wouter Symons notifications at github.com
Mon May 4 23:02:19 CEST 2020

@JannesVolkens Sorry, corona-times were though on me and didn't have much time (and energy) to work on this further. 
I had another look at it today, made a big test-setup to hook up a logic analyzer on a bunch of lines,  and compared the SPI-communication of AVR <--> MCP with STM <--> MCP, and couldn't find much of a difference here (except for a few slight bytes that were different, but that's not abnormal I think). 

So why doesn't it work? Even putting a bunch of debug prints all over the place didn't give much leads to investigate. 

Turns out... the issue was fairly obvious... I started using the same breakout boards as you were (while I was using the IC's on perfboard before). The breakout boards use a different crystal frequency... DOH! 

The fix is simple, in the Makefile, change TEST_MCP2515_CLK to 8Mhz (instead of the default 16MHz). Then it worked like a charm! 

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