11 years, 8 months ago.

CAN Bus Transmit

Hi,

I'm trying to send sensor values from one mbed controller to another mbed controller through CAN bus , i'm able to receive the message from the other side but the message data is garbled .

The read function returns the float value from 0.0 to 1.0 and i have done a type cast from an float pointer to an char pointer i guess that's giving some problems. Please give suggestions on the same and i have put up the hyperterminal screenshots and the code for the same .

Please let me know what changes have to be made in the code .

Transmitter Code

<<code main.cpp>>

1. include "mbed.h" CAN can1(p30, p29); AnalogIn pin(p18);

void send(char *y) {

if(can1.write(CANMessage(20, y,1))) { printf("\n Message sent: %s", *y); } }

int main() { volatile float x; while(1) { x=pin.read(); printf("\n The value read by the sensor is = %f",x);

send((char *)&x); wait(0.3); } }

<</ code>>

Receiver Code

<< code main.cpp>>

1. include "mbed.h"

CAN can(p30, p29);

int main() {

CANMessage msg;

while(1) {

if(can.read(msg)) {

printf("\n Message id :%d", msg.id);

printf("\n Message received: %f", msg.data);

wait(0.1);

} }

} <</ code>>

Receiver Hyperterminal

Transmitter Hyperterminal