Hi, I'm trying to implement CAN bus to share data between arduino nano and esp8266 (Lolin (wemos) D1 mini pro). I have big trouble making this work. After some trials I'm ended up with GitHub - coryjfowler/MCP_CAN_lib: MCP_CAN Library, so with this code:
// CAN Receive Example
//
#include </home/myuser/Arduino/libraries/MCP_CAN_lib/mcp_can.h>
#include <SPI.h>
#define D0 16
#define D1 5 // I2C Bus SCL (clock)
#define D2 4 // I2C Bus SDA (data)
#define D3 0
#define D4 2 // Same as "LED_BUILTIN", but inverted logic
#define D5 14 // SPI Bus SCK (clock)
#define D6 12 // SPI Bus MISO
#define D7 13 // SPI Bus MOSI
#define D8 15 // SPI Bus SS (CS)
#define D9 3 // RX0 (Serial console)
#define D10 1 // TX0 (Serial console)
long unsigned int rxId;
unsigned char len = 0;
unsigned char rxBuf[8];
char msgString[128]; // Array to store serial string
#define CAN0_INT D0 // Set INT to pin 2
MCP_CAN CAN0(D8); // Set CS to pin 10
void setup()
{
Serial.begin(9600);
// Initialize MCP2515 running at 8MHz with a baudrate of 500kb/s and the masks and filters disabled.
if(CAN0.begin(MCP_ANY, CAN_500KBPS, MCP_8MHZ) == CAN_OK)
Serial.println("MCP2515 Initialized Successfully!");
else
Serial.println("Error Initializing MCP2515...");
CAN0.setMode(MCP_NORMAL); // Set operation mode to normal so the MCP2515 sends acks to received data.
pinMode(CAN0_INT, INPUT); // Configuring pin for /INT input
Serial.println("MCP2515 Library Receive Example...");
}
void loop()
{
if(!digitalRead(CAN0_INT)) // If CAN0_INT pin is low, read receive buffer
{
CAN0.readMsgBuf(&rxId, &len, rxBuf); // Read data: len = data length, buf = data byte(s)
if((rxId & 0x80000000) == 0x80000000) // Determine if ID is standard (11 bits) or extended (29 bits)
sprintf(msgString, "Extended ID: 0x%.8lX DLC: %1d Data:", (rxId & 0x1FFFFFFF), len);
else
sprintf(msgString, "Standard ID: 0x%.3lX DLC: %1d Data:", rxId, len);
Serial.print(msgString);
if((rxId & 0x40000000) == 0x40000000){ // Determine if message is a remote request frame.
sprintf(msgString, " REMOTE REQUEST FRAME");
Serial.print(msgString);
} else {
for(byte i = 0; i<len; i++){
sprintf(msgString, " 0x%.2X", rxBuf[i]);
Serial.print(msgString);
}
}
Serial.println();
}
}
/*********************************************************************************************************
END FILE
*********************************************************************************************************/
I'm having compiling error: below first error from log.
/home/myuser/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld: /tmp/arduino_build_273614/sketch/CAN_receive.ino.cpp.o:(.text.setup+0x14): undefined reference to `_ZN7MCP_CAN5beginEhhh'
/home/myuser/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld: /tmp/arduino_build_273614/sketch/CAN_receive.ino.cpp.o:(.text.setup+0x18): undefined reference to `_ZN7MCP_CAN7setModeEh'
/home/myuser/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld: /tmp/arduino_build_273614/sketch/CAN_receive.ino.cpp.o: in function `setup':
/home/myuser/Arduino/libraries/MCP_CAN_lib/examples/CAN_receive/CAN_receive.ino:29: undefined reference to `_ZN7MCP_CAN5beginEhhh'
/home/myuser/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld: /home/salvicio/Arduino/libraries/MCP_CAN_lib/examples/CAN_receive/CAN_receive.ino:33: undefined reference to `_ZN7MCP_CAN7setModeEh'
/home/myuser/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld: /tmp/arduino_build_273614/sketch/CAN_receive.ino.cpp.o:(.text.loop+0x28): undefined reference to `_ZN7MCP_CAN10readMsgBufEPmPhS1_'
/home/myuser/.arduino15/packages/esp8266/tools/xtensa-lx106-elf-gcc/3.0.4-gcc10.3-1757bed/bin/../lib/gcc/xtensa-lx106-elf/10.3.0/../../../../xtensa-lx106-elf/bin/ld: /tmp/arduino_build_273614/sketch/CAN_receive.ino.cpp.o: in function `loop':
/home/myuser/Arduino/libraries/MCP_CAN_lib/examples/CAN_receive/CAN_receive.ino:47: undefined reference to `_ZN7MCP_CAN10readMsgBufEPmPhS1_'
Hope for some suggestions.
Regards