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

#define SPI_MOSI 23
#define SPI_CS 5
#define SPI_SCLK 18
#define NLSF595 4

spi_device_handle_t handle;

void ADC_init()
{
  adc1_config_width(ADC_WIDTH_BIT_10);
  adc1_config_channel_atten(ADC1_CHANNEL_3, ADC_ATTEN_DB_11);
}

void SPI_init()
{
  spi_bus_config_t bus_cfg = 
  {
    .mosi_io_num = SPI_MOSI,
    .miso_io_num = -1,
    .sclk_io_num = SPI_SCLK,
    .quadwp_io_num = -1,
    .quadhd_io_num = -1,
    .max_transfer_sz = 1,
  };

  spi_device_interface_config_t dev_cfg = 
  {
    .mode = 0,
    .clock_speed_hz = SPI_CLK_SRC_DEFAULT,
    .spics_io_num = SPI_CS,
    .queue_size = 1,

  };

  spi_bus_initialize(SPI2_HOST, &bus_cfg, SPI_DMA_CH_AUTO);
  spi_bus_add_device(SPI2_HOST, &dev_cfg, &handle);

}

void write_NLSF595(uint8_t data)
{ 
    spi_transaction_t t;

    memset(&t, 0, sizeof(t));
    t.length = 8;
    t.tx_buffer = &data;
    spi_device_polling_transmit(handle, &t);

    gpio_set_level(NLSF595, 1);
    gpio_set_level(NLSF595, 0);

}

void set_rgb()
{
    uint8_t color=0b11111111;

    color = 0b11011111;//xxx1 xx1x = red and green

    write_NLSF595(color);  

}

void app_main()
{
    ADC_init();
    SPI_init();
    gpio_set_direction(NLSF595, GPIO_MODE_OUTPUT);
    while(1)
    {
      set_rgb();
      vTaskDelay(pdMS_TO_TICKS(1000));
    }
}