mirror of
https://github.com/RobTillaart/Arduino.git
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156 lines
3.3 KiB
C++
156 lines
3.3 KiB
C++
//
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// FILE: DAC8552.cpp
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// AUTHOR: Rob Tillaart
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// PURPOSE: Arduino library for DAC8552 SPI Digital Analog Convertor
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// VERSION: 0.2.1
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// URL: https://github.com/RobTillaart/DAC8552
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//
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// HISTORY:
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// 0.1.0: 2017-12-14 initial version
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// 0.1.1: 2017-12-19 fix begin() bug
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// 0.1.2 2020-04-06 minor refactor, readme.md
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// 0.1.3 2020-06-07 fix library.json
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// 0.2.0 2020-12-18 add arduino-ci + unit test
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// add slave select pin for HW constructor
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// 0.2.1 2021-06-02 compile ESP32 + fix for channel B
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#include "DAC8552.h"
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#define MAXVOLTAGE 5.0
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#define MAXVALUE 0xFFFF
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DAC8552::DAC8552(uint8_t slaveSelect)
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{
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_hwSPI = true;
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_slaveSelect = slaveSelect;
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}
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DAC8552::DAC8552(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect)
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{
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_hwSPI = false;
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_spiData = spiData;
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_spiClock = spiClock;
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_slaveSelect = slaveSelect;
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}
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// initializes the SPI
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// and sets internal state
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void DAC8552::begin()
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{
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pinMode(_slaveSelect, OUTPUT);
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digitalWrite(_slaveSelect, HIGH);
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if(_hwSPI)
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{
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SPI.begin();
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delay(1);
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}
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else
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{
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pinMode(_spiData, OUTPUT);
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pinMode(_spiClock, OUTPUT);
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digitalWrite(_spiData, LOW);
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digitalWrite(_spiClock, LOW);
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}
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_value[0] = 0;
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_value[1] = 0;
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_register[0] = 0x00;
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_register[1] = 0x40;
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}
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// channel = 0, 1, 2, 3 depending on type
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// value = 0..65535
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void DAC8552::bufferValue(uint8_t channel, uint16_t value)
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{
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_value[channel] = value;
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updateDevice(channel, false);
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}
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// channel = 0, 1, 2, 3 depending on type
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// value = 0..65535
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void DAC8552::setValue(uint8_t channel, uint16_t value)
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{
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_value[channel] = value;
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updateDevice(channel, true);
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}
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// channel = 0, 1, 2, 3 depending on type
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// returns 0..65535
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uint16_t DAC8552::getValue(uint8_t channel)
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{
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return _value[channel];
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}
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void DAC8552::bufferPowerDown(uint8_t channel, uint8_t powerDownMode)
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{
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_register[channel] &= 0xFC;
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_register[channel] |= (powerDownMode & 0x03);
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updateDevice(channel, false);
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}
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void DAC8552::setPowerDown(uint8_t channel, uint8_t powerDownMode)
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{
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_register[channel] &= 0xFC;
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_register[channel] |= (powerDownMode & 0x03);
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updateDevice(channel, true);
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}
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uint8_t DAC8552::getPowerDownMode(uint8_t channel)
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{
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return _register[channel] & 0x03;
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}
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// channel = 0, 1, 2, 3 depending on type
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// direct = true ==> write buffers to both channel A and channel B
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// direct = false ==> buffer value
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void DAC8552::updateDevice(uint8_t channel, bool directWrite)
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{
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uint8_t configRegister = _register[channel];
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if (directWrite) configRegister |= 0x30;
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if (_hwSPI)
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{
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SPI.beginTransaction(SPISettings(16000000, MSBFIRST, SPI_MODE1));
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digitalWrite(_slaveSelect, LOW);
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SPI.transfer(configRegister);
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SPI.transfer(_value[channel] >> 8);
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SPI.transfer(_value[channel] & 0xFF);
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digitalWrite(_slaveSelect, HIGH);
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SPI.endTransaction();
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}
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else // Software SPI
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{
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digitalWrite(_slaveSelect, LOW);
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swSPI_transfer(configRegister);
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swSPI_transfer(_value[channel] >> 8);
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swSPI_transfer(_value[channel] & 0xFF);
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digitalWrite(_slaveSelect, HIGH);
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}
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}
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// simple one mode version
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void DAC8552::swSPI_transfer(uint8_t value)
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{
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for (uint8_t mask = 0x80; mask; mask >>= 1)
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{
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digitalWrite(_spiData,(value & mask) != 0);
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digitalWrite(_spiClock, HIGH);
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digitalWrite(_spiClock, LOW);
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}
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}
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// -- END OF FILE --
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