text: /***************************************************************
   *
   * External DAC for Alligator Board
   *
   ****************************************************************/
  
  #include "../../inc/MarlinConfig.h"
  
  #if MB(ALLIGATOR)
  
  #include "dac_dac084s085.h"
  
  #include "../../MarlinCore.h"
  #include "../../module/stepper.h"
  #include "../../HAL/shared/Delay.h"
  
  dac084s085::dac084s085() { }
  
  void dac084s085::begin() {
    uint8_t externalDac_buf[] = { 0x20, 0x00 }; // all off
  
    // All SPI chip-select HIGH
    SET_OUTPUT(DAC0_SYNC);
    #if HAS_MULTI_EXTRUDER
      SET_OUTPUT(DAC1_SYNC);
    #endif
    cshigh();
    spiBegin();
  
    //init onboard DAC
    DELAY_US(2);
    WRITE(DAC0_SYNC, LOW);
    DELAY_US(2);
    WRITE(DAC0_SYNC, HIGH);
    DELAY_US(2);
    WRITE(DAC0_SYNC, LOW);
  
    spiSend(SPI_CHAN_DAC, externalDac_buf, COUNT(externalDac_buf));
    WRITE(DAC0_SYNC, HIGH);
  
    #if HAS_MULTI_EXTRUDER
      //init Piggy DAC
      DELAY_US(2);
      WRITE(DAC1_SYNC, LOW);
      DELAY_US(2);
      WRITE(DAC1_SYNC, HIGH);
      DELAY_US(2);
      WRITE(DAC1_SYNC, LOW);
  
      spiSend(SPI_CHAN_DAC, externalDac_buf, COUNT(externalDac_buf));
      WRITE(DAC1_SYNC, HIGH);
    #endif
  
    return;
  }
  
  void dac084s085::setValue(const uint8_t channel, const uint8_t value) {
    if (channel >= 7) return; // max channel (X,Y,Z,E0,E1,E2,E3)
  
    const uint8_t externalDac_buf[] = {
      0x10 | ((channel > 3 ? 7 : 3) - channel << 6) | (value >> 4),
      0x00 | (value << 4)
    };
  
    // All SPI chip-select HIGH
    cshigh();
  
    if (channel > 3) {        // DAC Piggy E1,E2,E3
      WRITE(DAC1_SYNC, LOW);
      DELAY_US(2);
      WRITE(DAC1_SYNC, HIGH);
      DELAY_US(2);
      WRITE(DAC1_SYNC, LOW);
    }
    else {                    // DAC onboard X,Y,Z,E0
      WRITE(DAC0_SYNC, LOW);
      DELAY_US(2);
      WRITE(DAC0_SYNC, HIGH);
      DELAY_US(2);
      WRITE(DAC0_SYNC, LOW);
    }
  
    DELAY_US(2);
    spiSend(SPI_CHAN_DAC, externalDac_buf, COUNT(externalDac_buf));
  }
  
  void dac084s085::cshigh() {
    WRITE(DAC0_SYNC, HIGH);
    #if HAS_MULTI_EXTRUDER
      WRITE(DAC1_SYNC, HIGH);
    #endif
    WRITE(SPI_EEPROM1_CS, HIGH);
    WRITE(SPI_EEPROM2_CS, HIGH);
    WRITE(SPI_FLASH_CS, HIGH);
    WRITE(SS_PIN, HIGH);
  }
  
  #endif // MB(ALLIGATOR)
  