Tom Doyle

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7 years, 11 months ago.

CANNucleo and mbed-rtos

Hello,

Has anyone tried to used the mbed-rtos lib with CANNucleo? The following program is a simple test to listen for CAN messages. It works as expected.

#include "mbed.h"
#include "CAN.h"
//#include "rtos.h"

CAN can(PA_11, PA_12);
CANMessage rxMsg;
volatile bool msgAvailable = false;
RawSerial pc(USBTX, USBRX);

void onMsgReceived() 
{
    msgAvailable = true;
}

int main() 
{
    pc.baud(9600);
    pc.printf("CANNucleo Test\n\r");
    can.frequency(125000);
    can.monitor(true);
    can.attach(&onMsgReceived, CAN::RxIrq);
    
    while (true) 
    {
        if (msgAvailable) 
        {
            msgAvailable = false;
            can.read(rxMsg);
            pc.printf("CAN message received:\r\n");
            pc.printf("  ID     = %#x\r\n", rxMsg.id);
            pc.printf("  Type   = %d\r\n", rxMsg.type);
            pc.printf("  Format = %d\r\n", rxMsg.format);
            pc.printf("  Length = %d\r\n", rxMsg.len);
            pc.printf("  Data   =");            
            
            for (int i = 0; i < rxMsg.len; i++)
            {
                pc.printf(" %x", rxMsg.data[i]);
            }
            
            pc.printf("\r\n");
        }
    }
}

However, when I include the mbed-rtos lib with the project, the project locks (I see no received CAN messages). I am using the latest mbed, CANNucleo, and mbed-rtos libs. Also, I am running the project on a NUCLEO-F446RE.

Regards,

Tom

My bad. It appears the problem is related to the serial driver and rtos. The program works with the mbed-rtos lib if I remove the serial related statements (pc.baud & pc.printf) and just blink an LED when a CAN message is received. This problem does not exist as tested on the EA LPC4088 QSB platform.

posted by Tom Doyle 14 May 2016
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