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

void cs_change_command()
{
	struct spi_ioc_transfer tr;
	static int fd = -1;
	uint8_t rx_buffer[128];
	uint8_t tx_buffer[128];

	printf("%s() start\n", __func__);

	if (fd < 0) {
		uint8_t bits = 0;
		uint8_t mode = SPI_MODE_3;

		fd = open("/dev/spidev1.3", O_RDWR);
		if (fd < 0) {
			printf("Failed to open spidev1.3\n");
			return;
		}

		if(ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits) < 0)
			printf("spidev1.3 ioctl0 failed (%m)\n");
		if(ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0)
			printf("spidev1.3 ioctl1 failed (%m)\n");
		if(ioctl(fd, SPI_IOC_WR_MODE, &mode) < 0)
			printf("spidev1.3 ioctl2 failed (%m)\n");
	}

	memset(&tr, 0, sizeof (tr));

	memset(rx_buffer, 0, 128);
	memset(tx_buffer, 0, 128);
	tx_buffer[0] = 0xA5;
	tx_buffer[1] = 0x10;
	tx_buffer[2] = 0xF0;
	tx_buffer[3] = 0x00;

	tr.tx_buf = (unsigned long)tx_buffer;
    	tr.rx_buf = (unsigned long)rx_buffer;
    	tr.len = 128;
	tr.speed_hz = 10000000;
       	tr.delay_usecs = 1;
	tr.cs_change = 1;
    	tr.bits_per_word = 8;

	if (ioctl(fd, SPI_IOC_MESSAGE(1), &tr) < 0)
		printf("spidev1.3 ioctl failed (%m)\n");
	else
		printf("spidev1.3 ioctl success\n");
}

void no_dma_command()
{
	struct spi_ioc_transfer tr;
	static int fd = -1;
	uint8_t rx_buffer[3];
	uint8_t tx_buffer[3];

	printf("%s() start\n", __func__);

	if (fd < 0) {
		uint8_t bits = 0;
		uint8_t mode = SPI_MODE_3;

		fd = open("/dev/spidev1.1", O_RDWR);
		if (fd < 0) {
			printf("Failed to open spidev1.1\n");
			return;
		}

		if(ioctl(fd, SPI_IOC_WR_BITS_PER_WORD, &bits) < 0)
			printf("spidev1.1 ioctl0 failed (%m)\n");
		if(ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0)
			printf("spidev1.1 ioctl1 failed (%m)\n");
		if(ioctl(fd, SPI_IOC_WR_MODE, &mode) < 0)
			printf("spidev1.1 ioctl2 failed (%m)\n");
	}

	memset(&tr, 0, sizeof (tr));

	memset(rx_buffer, 0, 3);
	memset(tx_buffer, 0, 3);
	tx_buffer[0] = 0xA5;

	tr.tx_buf = (unsigned long)tx_buffer;
    	tr.rx_buf = (unsigned long)rx_buffer;
    	tr.len = 3;
	tr.speed_hz = 10000000;
       	tr.delay_usecs = 1;
	tr.cs_change = 1;
    	tr.bits_per_word = 8;

	if (ioctl(fd, SPI_IOC_MESSAGE(1), &tr) < 0)
		printf("spidev1.1 ioctl failed (%m)\n");
	else
		printf("spidev1.1 ioctl success\n");
}

int main()
{
	while (1) {
		cs_change_command();
		no_dma_command();
	}
}