src/lib/DAC/DAC.cpp

   1
   2 #include "DAC.h"
   3
   4 #if defined(POWER_OUTPUT_DAC)
   5 #include "helpers.h"
   6 #include "logging.h"
   7 #include <Wire.h>
   8
   9 #ifndef DAC_REF_VCC
  10 #define DAC_REF_VCC 3300
  11 #endif
  12
  13 void DAC::init()
  14 {
  15     DBGLN("Init DAC Driver");
  16
  17     // I2C initialization is the responsibility of the caller
  18     // e.g. Wire.begin(GPIO_PIN_SDA, GPIO_PIN_SCL);
  19
  20     m_state = UNKNOWN;
  21 }
  22
  23 void DAC::standby()
  24 {
  25     if (m_state != STANDBY)
  26     {
  27         Wire.beginTransmission(POWER_OUTPUT_DAC);
  28         Wire.write(0x00);
  29         Wire.write(0x00);
  30         Wire.endTransmission();
  31         m_state = STANDBY;
  32     }
  33 }
  34
  35 void DAC::resume()
  36 {
  37     if (m_state != RUNNING)
  38     {
  39         DAC::setVoltageRegDirect(m_currVoltageRegVal);
  40     }
  41 }
  42
  43 void DAC::setVoltageRegDirect(uint8_t voltReg)
  44 {
  45     m_currVoltageRegVal = voltReg;
  46     uint8_t RegH = ((voltReg & 0b11110000) >> 4) + (0b0000 << 4);
  47     uint8_t RegL = (voltReg & 0b00001111) << 4;
  48
  49     Wire.beginTransmission(POWER_OUTPUT_DAC);
  50     Wire.write(RegH);
  51     Wire.write(RegL);
  52     Wire.endTransmission();
  53 }
  54
  55 void DAC::setPower(uint32_t milliVolts)
  56 {
  57     uint8_t ScaledVolts = map(milliVolts, 0, DAC_REF_VCC, 0, 255);
  58     setVoltageRegDirect(ScaledVolts);
  59     DBGLN("DAC::setPower(%umV)", milliVolts);
  60 }
  61
  62 DAC TxDAC;
  63
  64 #endif // defined(POWER_OUTPUT_DAC)