Problem with multiple CAN lines

[siksndavis]

Hello, using STM32F103RBT6 board with two TJA1050 transceivers on it. When trying to compile code for first CAN bus line, everything goes smooth, I receive and send data, all goes well. Problem starts when trying to compile code for any other CAN bus line (2/3/4), even using the example code.

` / This is simple example to read all data from CAN bus and print it out to serial bus. /

include "STM32_CAN.h"

//STM32_CAN Can( CAN1, DEF ); //Use PA11/12 pins for CAN1. //STM32_CAN Can( CAN1, ALT ); //Use PB8/9 pins for CAN1. //STM32_CAN Can( CAN1, ALT_2 ); //Use PD0/1 pins for CAN1. STM32_CAN Can2( CAN2, DEF ); //Use PB12/13 pins for CAN2. //STM32_CAN Can( CAN2, ALT ); //Use PB5/6 pins for CAN2 //STM32_CAN Can( CAN3, DEF ); //Use PA8/15 pins for CAN3. //STM32_CAN Can( CAN3, ALT ); //Use PB3/4 pins for CAN3

static CAN_message_t CAN_RX_msg;

void setup() { Serial.begin(115200); Can2.begin(); //Can.setBaudRate(250000); //250KBPS Can2.setBaudRate(500000); //500KBPS //Can.setBaudRate(1000000); //1000KBPS }

void loop() { if (Can2.read(CAN_RX_msg) ) { Serial.print("Channel:"); Serial.print(CAN_RX_msg.bus); if (CAN_RX_msg.flags.extended == false) { Serial.print(" Standard ID:"); } else { Serial.print(" Extended ID:"); } Serial.print(CAN_RX_msg.id, HEX); Serial.print(" DLC: "); Serial.print(CAN_RX_msg.len); if (CAN_RX_msg.flags.remote == false) { Serial.print(" buf: "); for(int i=0; i<CAN_RX_msg.len; i++) { Serial.print("0x"); Serial.print(CAN_RX_msg.buf[i], HEX); if (i != (CAN_RX_msg.len-1)) Serial.print(" "); } Serial.println(); } else { Serial.println(" Data: REMOTE REQUEST FRAME"); } } } `

`C:\Users\user\AppData\Local\Temp.arduinoIDE-unsaved202412-17680-d3dugb.57k8k\Read\Read.ino:9:17: error: 'CAN2' was not declared in this scope; did you mean 'Can2'? 9 | STM32_CAN Can2( CAN2, DEF ); //Use PB12/13 pins for CAN2. | ^~~~ | Can2

exit status 1

Compilation error: 'CAN2' was not declared in this scope; did you mean 'Can2'?`

And thats like that all the time. CAN1 works smooth. Can you help?

[pazi88]

As far as I know F103 only has single CAN imterface that has quite many alternative pins. But that's why CAN2 doesn't work, because it doesn't have it.

[siksndavis]

Thanks man, you were right! I'm still noob at MCU's :) Will try with other board I have, STM32F105RBT6, but I just tried to compile for test with F205 and it compiled like a charm!