CAN libraries for ESP8266

shrujanus · February 26, 2023, 4:02am

So I bought a CAN transceiver for my NodeMCU. I tried using installing this library(PlatformIO Registry), but the IDE is not detecting that I am using an esp8622 and giving me an error. Can anyone help with how to install it properly and use it?

maxgerhardt · February 26, 2023, 12:42pm

Library issue.

github.com/sandeepmistry/arduino-CAN

ESP8266 support

opened 03:40PM - 17 Jan 23 UTC

Jojo-A

Hi, although it is not explicitly mentioned to be supported, I tried to get t…his library running on a ESP8266 board (NodeMCU). After my first implementation, the compilation failed with: ``` Arduino/libraries/CAN/src/MCP2515.cpp:268:9: error: 'class SPIClass' has no member named 'usingInterrupt' 268 | SPI.usingInterrupt(digitalPinToInterrupt(_intPin)); | ^~~~~~~~~~~~~~ ``` After a little bit of research I got to the conclusion, that the interrupt structure of the ESP8266 might just not (yet) be supported. So I went into the MCP2515.cpp and the MCP2515.h and removed all references to anything that had something to do with interrupts. in the .h file: ``` // virtual void onReceive(void(*callback)(int)); // void handleInterrupt(); // static void onInterrupt(); ``` and of course the corresponding functions in the .cpp file. And voilà, compiled successfully and runs fine on my NodeMCU board (tested with a PCAN-USB dongle). So it would be nice to see the ESP8266 support to get it working with interrupts OOTB. It would make this library even more versatile and would target many more people out there! Greetings