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#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/spi_master.h"
#include "esp_log.h"
#include "driver/gpio.h"

#define GPIO_MOSI 23
#define GPIO_MISO 19
#define GPIO_SCLK 18
#define GPIO_CS 5

void app_main(void)
{
    spi_device_handle_t handle;

    spi_bus_config_t buscfg = {
        .mosi_io_num = GPIO_MOSI,
        .miso_io_num = GPIO_MISO,
        .sclk_io_num = GPIO_SCLK,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1
        };

    spi_device_interface_config_t devcfg = {
        .command_bits = 0,
        .address_bits = 0,
        .dummy_bits = 0,
        .clock_speed_hz = 400000,
        .duty_cycle_pos = 128,
        .mode = 0,
        .spics_io_num = GPIO_CS,
        .queue_size = 7,
        };

    spi_bus_initialize(VSPI_HOST, &buscfg, SPI_DMA_CH_AUTO);
    spi_bus_add_device(VSPI_HOST, &devcfg, &handle);

    uint8_t recvbuf[1];
    uint8_t sendbuf[1] = {0xD0};
    spi_transaction_t t;
    memset(&t, 0, sizeof(t));

    t.length = 16;
    t.rxlength = 8;
    t.tx_buffer = sendbuf;
    t.rx_buffer = recvbuf;
    spi_device_transmit(handle, &t);
    printf("ID: %x\n", recvbuf[0]);
}