Melchior Pau / Mbed 2 deprecated CANtest

With this program you can configure and run a CAN compatible (also LSS protocol compatible) motor through the mbed\'s CANbus. Further more it gives a basic template that lets you create your own CAN messages. I\'ve implemented a configuration and a running example that the program runs through. Also there\'s 2 kinds of loops it can go into after it\'s ran through it\'s configuration and/or speed setting. It can continuously ask for the motor\'s status (node guarding kind of thing) OR it can continuously ask for the motor\'s position. Make sure you have a if, (elsif), else structure so the counter doesn\'t run out of control. I\'ve tried to put as many comments in as I could. I hope it helps you in understanding the basics of CAN and running devices. I\'m new to it myself, so any critisism is welcome. Enjoy.

Dependencies:   mbed

main.cpp

Committer:
OTBsolar
Date:
2011-02-11
Revision:
0:af731d8a8d2c
Child:
1:3759c5f6cf76

File content as of revision 0:af731d8a8d2c:

#include "mbed.h"
#include "CAN.h"

Ticker ticker;
DigitalOut led1(LED1);
DigitalOut led2(LED2);
CAN can1(p9, p10);  // rd, td
CAN can2(p30, p29);

int counter = 0;
char data[8];
CANMessage msg;


void send() {
    if(counter==0) {
        //--------Global Start nodes
        data[0] = (char)(0x01); // NMT Start RemoteNode
        data[1] = (char)(0x00); // Global
        data[2] = (char)(0x00);
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(0000,data,2))) {
            printf("Startup sent \n");
        }
        led1 = !led1;
        counter ++;
    }
    else if(counter==1) {
        //--------LSS Configure mode
        data[0] = (char)(0x04); // LSS Set Mode
        data[1] = (char)(0x01); // Mode Configure
        data[2] = (char)(0x00);
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(2021,data,2))) {
            printf("LSS Config mode sent \n");
        }
        led1 = !led1;
        counter ++;
    }
    else if(counter==2) {
        //--------LSS Set Node_ID
        data[0] = (char)(0x11); // LSS Set Node_ID
        data[1] = (char)(0x01); // to Node_ID: 01
        data[2] = (char)(0x00);
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(2021,data,2))) {
            printf("LSS Set Node_ID to 0x01 sent \n");
        }
        led1 = !led1;
        counter ++;
    }
    else if(counter==3) {
        //--------LSS Save Config
        data[0] = (char)(0x17); // LSS Save Config
        data[1] = (char)(0x00);
        data[2] = (char)(0x00);
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(2021,data,1))) {
            printf("LSS Save Config sent \n");
        }
        led1 = !led1;
        counter ++;
    }
    else if(counter==4) {
        //--------LSS Set Baudrate
        data[0] = (char)(0x13); // LSS Set Baudrate
        data[1] = (char)(0x00); // 
        data[2] = (char)(0x02); // Baudrate index (500kb/s)
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(2021,data,3))) {
            printf("LSS Config mode sent \n");
        }
        led1 = !led1;
        counter ++;
    }
    /*else if(counter==5) (
        //--------LSS Set Bit timing
        data[0] = (char)(0x15); // LSS Set Bit timing
        data[1] = (char)(0x00); // Mode Configure
        data[2] = (char)(0x00);
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(2021,data,2))) {
            printf("LSS Config mode sent \n");
        }
        led1 = !led1;
        counter ++;
    }*/
    else if(counter==5) {
        //--------LSS Operation Mode
        data[0] = (char)(0x04); // LSS Set Mode
        data[1] = (char)(0x00); // Mode operation
        data[2] = (char)(0x00);
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(2021,data,2))) {
            printf("LSS Operation mode sent \n");
        }
        led1 = !led1;
        counter ++;
    }
    else {
        //--------Inquire IDNode_ID
        data[0] = (char)(0x5E);
        data[1] = (char)(0x00);
        data[2] = (char)(0x00);
        data[3] = (char)(0x00);
        data[4] = (char)(0x00);
        data[5] = (char)(0x00);
        data[6] = (char)(0x00);
        data[7] = (char)(0x00);
        if(can1.write(CANMessage(2021,data,1))) {
            printf("Status check sent \n");
        }
        led1 = !led1;
        counter = 10;
    }    
}

int main() {
    can2.frequency(500000); //500kbit/s
    can1.frequency(500000);
    ticker.attach(&send, 1); //Send every second
    while(1) {
        if(can2.read(msg)) {
            printf("Message read with ID: %d\n", msg.id);
            printf("Data: %x", msg.data[0]);
            printf(" %x", msg.data[1]);
            printf(" %x", msg.data[2]);
            printf(" %x", msg.data[3]);
            printf(" %x", msg.data[4]);
            printf(" %x", msg.data[5]);
            printf(" %x", msg.data[6]);
            printf(" %x\n", msg.data[7]);
            printf("Length: %d", msg.len);
            printf(", Type: %d", msg.type);
            printf(", Format: %d\n\n", msg.format);
            led2 = !led2;
        }
    }
}