8 years, 1 month ago.

lpc1768 , canbus communicate ,lpc serial communicate

LPC1768 CAN BUS COMMUNİCATİON

CANT READ DATA FROM CANBUS LINE BY LPC1768

hii , ı want make canbus communication project. ı will read sensors by 2 atmega328p microcontrollers and send data to canbus line by mcp2515 module. ı made till that. then ı will take data by lpc1768 from canbus line. then ı will send data to computer(c# monitor) .But ı cant get data to lpc1768 from canbus line. ı use these codes at down. ı read some sharings here but ı could not solve my problem. my frequency is 500000 and first can ıd =1, and second canıd is =2. what ıs my wrong or what ı must to do? thanks for your help.

<< code >>

1. include "mbed.h"
2. include "CAN.h"

Serial pc(USBTX, USBRX); Serial uart(p28, p27);

CAN can(p30, p29); CANMessage msg; float signal;

int main() { pc.baud(9600); can.frequency(500000); can.reset(); CANMessage msg; create empty CAN message printf("received a CANbus message...\n"); Write to serial terminal

while(1) {

if(can.read(msg)) { pc.printf("CAN message received\r\n"); pc.printf(" ID = 0x%.3x\r\n", msg.id); pc.printf(" Type = %d\r\n", msg.type); pc.printf(" Format = %d\r\n", msg.format); pc.printf(" Length = %d\r\n", msg.len); pc.printf(" Data =");

if(msg.id==1){

for(int i = 0; i < msg.len; i++){ pc.putc(msg.data[i]); pc.printf(" %.2x", msg.data[i]);

}} else { for(int i = 0; i < msg.len; i++){ pc.putc(msg.data[i]); pc.printf(msg.data[i]); pc.printf(" %.2x", msg.data[i]);

signal = *reinterpret_cast<float*>(msg.data); pc.printf(" signal = %5.2f\r\n", signal); }} wait(0.1); } wait(0.1); } }

<</code>>