#include <string.h>

#include <zephyr.h>
#include <device.h>

#include <drivers/gpio.h>
#include <drivers/spi.h>

static struct device *gpio_dev;

static struct device *spi;
static struct spi_config spi_cfg;

static struct spi_buf_set spi_buf_set_tx; 
static struct spi_buf_set spi_buf_set_rx;

static struct spi_buf spi_buf_tx;
static struct spi_buf spi_buf_rx;

static uint8_t tx_buf[255];
static uint8_t rx_buf[255];

#define MY_SPI DT_NODELABEL(spi2)

int main(void)
{
	gpio_dev = device_get_binding("GPIO_0");

	gpio_pin_configure(gpio_dev, 14, GPIO_OUTPUT_ACTIVE);
	gpio_pin_configure(gpio_dev, 22, GPIO_OUTPUT_ACTIVE);
	gpio_pin_configure(gpio_dev, 24, GPIO_OUTPUT_ACTIVE);
	gpio_pin_configure(gpio_dev, 30, GPIO_OUTPUT_ACTIVE);
	gpio_pin_configure(gpio_dev, 31, GPIO_OUTPUT_ACTIVE);

	gpio_pin_set(gpio_dev, 14, 0);
	gpio_pin_set(gpio_dev, 22, 0);
	gpio_pin_set(gpio_dev, 24, 0);
	gpio_pin_set(gpio_dev, 30, 0);
	gpio_pin_set(gpio_dev, 31, 0);

	k_msleep(1000);
	gpio_pin_set(gpio_dev, 24, 1);

	spi = device_get_binding(DT_LABEL(MY_SPI));
	if (!spi) {
		printk("Could not find SPI driver\n");
		return -1;
	}
	printk("SPI: 0x%X\n", (unsigned int)spi);

	spi_cfg.operation = SPI_WORD_SET(8);
	spi_cfg.frequency = 125000;

	spi_buf_tx.buf = tx_buf;
	spi_buf_tx.len = 5;

	spi_buf_rx.buf = rx_buf;
	spi_buf_rx.len = 5;

	spi_buf_set_tx.buffers = &spi_buf_tx;
	spi_buf_set_tx.count = 1;

	spi_buf_set_rx.buffers = &spi_buf_rx;
	spi_buf_set_rx.count = 1;

	uint32_t cnt=0;
	while(1){
		memset(&tx_buf[0], 0, 255);
		memset(&rx_buf[0], 0, 255);

		spi_transceive(spi, &spi_cfg, &spi_buf_set_tx, &spi_buf_set_rx);
		printk("0x%x %d\n", *((uint32_t*)(rx_buf+1)), cnt++);

		k_msleep(1000);
	}
}