#include <Arduino.h>
#include "config.h"

#define SCLK B00000001  //D8 -> B0
#define MAX_CANT_ADC 4
#define BITS_ADC 24
#define DOUT1 B00001000      // DOUT del ADS1231 1
#define DOUT2 B00010000      // DOUT del ADS1231 2
#define DOUT3 B00100000      // DOUT del ADS1231 3
#define DOUT4 B01000000      // DOUT del ADS1231 4


struct {
  struct {
    long raw[MAX_CANT_ADC];       // 0
    long filtered[MAX_CANT_ADC];  // 8
  } data;
  struct {
    uint8_t filter;  // 16.0
    uint8_t mode;    // 16.8
    union {
      struct {
        int enabled : 4;  // 17.0
        int flags : 4;    // 17.4
      };
      uint8_t mask : 8;  // 17.0
    } adc;
    uint8_t modbus_id;             // 17.8
    unsigned int modbus_baudrate;  // 18
    unsigned int modbus_format;    // 19
  } config;
  union {
    struct {
      int overload : 4;           // 20.0
      bool underload : 4;         // 20.4
      bool adc_mask_changed : 1;  // 20.8
    };
    unsigned int word;  // 20
  } status;
  unsigned int isr_duration;               // 21
  unsigned int loop_duration;              // 22
  unsigned int command;                    // 23
  unsigned int jitter_time[MAX_CANT_ADC];  // 24 - 27
  long dac_sample;                         // 28 - 29
  long offset;                             // 30 - 31
  float span;                              // 32 - 33
} registers;

int adc_dout[MAX_CANT_ADC] = {DOUT1, DOUT2, DOUT3, DOUT4};

#define SCLK_PORT PORTB
#define SCLK_PIN 8
#define SCLK_HIGH() (SCLK_PORT |= (1 << SCLK_PIN))
#define SCLK_LOW() (SCLK_PORT &= ~(1 << SCLK_PIN))

void setup()
{
  pinMode(LED_BUILTIN, OUTPUT);
  //pinMode(SCLK, OUTPUT);

  DDRB |= B00000001; // set PORTB (D8) to output SCLK
  DDRD &= B10000111; // set PORTD (D3 D4 D5 D6) to input


  Serial.begin(115200, SERIAL_8N1);
}

void loop()
{
  //long data[4];

   long data[4]; // pasar a STATIC .. para ahorrar tiempo?
   long micros_end;
   long micros_start;

  //digitalWrite(LED_BUILTIN, HIGH);
  micros_start = micros();

  // Resetea el buffer de lectura
  data[0] = 0;
  data[1] = 0;
  data[2] = 0;
  data[3] = 0;

  // Lectura de los puertos bit a bit
  //------------------------------------------------------------------------
  for (int bit_index = 0; bit_index < BITS_ADC; bit_index++) {
    // Pulso alto para iniciar la salida de un BIT
    //digitalWrite(SCLK, HIGH);  // ____
    //digitalWrite(SCLK, LOW);   //     |___
    PORTB |= SCLK; // D8->>HIGH
    PORTB &=~SCLK; // D8->>LOW
    // SCLK_HIGH();
    // SCLK_LOW();
    data[0] = (data[0] << 1) | (PIND & adc_dout[0]);
    data[1] = (data[1] << 1) | (PIND & adc_dout[1]);
    data[2] = (data[2] << 1) | (PIND & adc_dout[2]);
    data[3] = (data[3] << 1) | (PIND & adc_dout[3]);
  }

  registers.data.raw[0] = data[0];
  registers.data.raw[1] = data[1];
  registers.data.raw[2] = data[2];
  registers.data.raw[3] = data[3];

  // pulso #25 para forzar a los DOUT-> HIGH
  //digitalWrite(SCLK, HIGH);
  //digitalWrite(SCLK, LOW);
  PORTB |= SCLK; // D8->>HIGH
  PORTB &=~SCLK; // D8->>LOW

  // Propago el signo de la señal
  if (registers.data.raw[0] & 0x800000) registers.data.raw[0] |= 0xFF000000;
  if (registers.data.raw[1] & 0x800000) registers.data.raw[1] |= 0xFF000000;
  if (registers.data.raw[2] & 0x800000) registers.data.raw[2] |= 0xFF000000;
  if (registers.data.raw[3] & 0x800000) registers.data.raw[3] |= 0xFF000000;

  micros_end = micros();
  digitalWrite(LED_BUILTIN, LOW);

  Serial.print("Tiempo: ");
  Serial.println(micros_end - micros_start);
}