/***************************************************************
 *
 * External DAC for Alligator Board
 *
 ****************************************************************/
#include "Marlin.h"

#if MB(ALLIGATOR)
  #include "stepper.h"
  #include "dac_dac084s085.h"

  dac084s085::dac084s085() {
    return ;
  }

  void dac084s085::begin() {
    uint8_t externalDac_buf[2] = {0x20,0x00};//all off

    // All SPI chip-select HIGH
    pinMode (DAC0_SYNC, OUTPUT);
    digitalWrite( DAC0_SYNC , HIGH );
    #if EXTRUDERS > 1
      pinMode (DAC1_SYNC, OUTPUT);
      digitalWrite( DAC1_SYNC , HIGH );
    #endif
    digitalWrite( SPI_EEPROM1_CS , HIGH );
    digitalWrite( SPI_EEPROM2_CS , HIGH );
    digitalWrite( SPI_FLASH_CS , HIGH );
    digitalWrite( SS_PIN , HIGH );
    spiBegin();

    //init onboard DAC
    delayMicroseconds(2U);
    digitalWrite( DAC0_SYNC , LOW );
    delayMicroseconds(2U);
    digitalWrite( DAC0_SYNC , HIGH );
    delayMicroseconds(2U);
    digitalWrite( DAC0_SYNC , LOW );

    spiSend(SPI_CHAN_DAC,externalDac_buf , 2);
    digitalWrite( DAC0_SYNC , HIGH );

    #if EXTRUDERS > 1
      //init Piggy DAC
      delayMicroseconds(2U);
      digitalWrite( DAC1_SYNC , LOW );
      delayMicroseconds(2U);
      digitalWrite( DAC1_SYNC , HIGH );
      delayMicroseconds(2U);
      digitalWrite( DAC1_SYNC , LOW );

      spiSend(SPI_CHAN_DAC,externalDac_buf , 2);
      digitalWrite( DAC1_SYNC , HIGH );
    #endif

    return;
  }

  void dac084s085::setValue(uint8_t channel, uint8_t value) {
    if(channel >= 7) // max channel (X,Y,Z,E0,E1,E2,E3)
      return;
    if(value > 255) value = 255;

    uint8_t externalDac_buf[2] = {0x10,0x00};

    if(channel > 3)
      externalDac_buf[0] |= (7 - channel << 6);
    else
      externalDac_buf[0] |= (3 - channel << 6);

    externalDac_buf[0] |= (value>>4);
    externalDac_buf[1] |= (value<<4);
    
    // All SPI chip-select HIGH
    digitalWrite( DAC0_SYNC , HIGH );
    #if EXTRUDERS > 1
      digitalWrite( DAC1_SYNC , HIGH );
    #endif
    digitalWrite( SPI_EEPROM1_CS , HIGH );
    digitalWrite( SPI_EEPROM2_CS , HIGH );
    digitalWrite( SPI_FLASH_CS , HIGH );
    digitalWrite( SS_PIN , HIGH );

    if(channel > 3) { // DAC Piggy E1,E2,E3

      digitalWrite(DAC1_SYNC , LOW);
      delayMicroseconds(2U);
      digitalWrite(DAC1_SYNC , HIGH);
      delayMicroseconds(2U);
      digitalWrite(DAC1_SYNC , LOW);
    }

    else { // DAC onboard X,Y,Z,E0

      digitalWrite(DAC0_SYNC , LOW);
      delayMicroseconds(2U);
      digitalWrite(DAC0_SYNC , HIGH);
      delayMicroseconds(2U);
      digitalWrite(DAC0_SYNC , LOW);
    }

    delayMicroseconds(2U);
    spiSend(SPI_CHAN_DAC,externalDac_buf , 2);

    return;
  }

#endif