#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/spi/spidev.h>

#define SPI_DEVICE "/dev/spidev1.0"

int main() {
    int spi_fd;
    uint8_t buffer[1] = {0x10};

    // Open SPI device
    spi_fd = open(SPI_DEVICE, O_RDWR);
    if (spi_fd < 0) {
        perror("Error opening SPI device");
        return EXIT_FAILURE;
    }

    uint8_t mode = SPI_MODE_0;
    uint8_t bits_per_word = 8;
    uint32_t speed_hz = 1000000;

    // Configure SPI parameters
    if (ioctl(spi_fd, SPI_IOC_WR_MODE, &mode) < 0 ||
        ioctl(spi_fd, SPI_IOC_WR_BITS_PER_WORD, &bits_per_word) < 0 ||
        ioctl(spi_fd, SPI_IOC_WR_MAX_SPEED_HZ, &speed_hz) < 0) {
        perror("Error configuring SPI");
        close(spi_fd);
        return EXIT_FAILURE;
    }

    while (1) {
        // Write data to SPI
        if (write(spi_fd, buffer, sizeof(buffer)) != sizeof(buffer)) {
            perror("Error writing to SPI");
            close(spi_fd);
            return EXIT_FAILURE;
        } else {
            printf("Transmitted: 0x%02X\n", buffer[0]);
        }
        // Add delay if needed
        usleep(1000000); // Delay for 1 second
    }

    // Close SPI device (not reached in this example)
    close(spi_fd);

    return EXIT_SUCCESS;
}