#include <iostream>
#include <wiringPiSPI.h>

#define SPI_CHANNEL 0
#define SPI_CLOCK_SPEED 1000000

int main(int argc, char **argv)
{
    int fd = wiringPiSPISetupMode(SPI_CHANNEL, SPI_CLOCK_SPEED, 0);
    if (fd == -1) {
        std::cout << "Failed to init SPI communication.\n";
        return -1;
    }
    std::cout << "SPI communication successfully setup.\n";
   
    unsigned char buf[2] = { 23, 0 };
    wiringPiSPIDataRW(SPI_CHANNEL, buf, 2);

    std::cout << "Data returned: " << +buf[1] << "\n"; 
    return 0;
}