spi.cpp

#include <stdlib.h>
#include <stdio.h>
#include <wiringPi.h>
#include <wiringPiSPI.h>

#include <iostream>

using namespace std;

const int CHANNEL_CAN = 1;

int main(int argc, char const *argv[])
{
    int result, fd;
    unsigned char buff[30];
    
    fd = wiringPiSPISetup(CHANNEL_CAN, 500000);
    if (fd == -1) {
        printf("Error setup\n");
        exit(EXIT_FAILURE);
    }
    
    int reg = 0x40;

    int GPIO[] = {0b00000001, 0b00000010, 0b00001000, 0b00010000};
    buff[0] = reg;
    for (int i = 0; i < 4; i++) {
        buff[1] = GPIO[i];
        printf("buff %i : %x %x\n",i, buff[0], buff[1]);
        result = wiringPiSPIDataRW(CHANNEL_CAN, buff, 2);
        printf("buff %i : %x %x\n",i, buff[0], buff[1]);
        buff[0] = reg;
        delay(1500);
    }

    return 0;

}