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111 lines
2.0 KiB
C++
111 lines
2.0 KiB
C++
//
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// FILE: DAC8551.cpp
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// AUTHOR: Rob Tillaart
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// PURPOSE: DAC8550 DAC8551 library for Arduino
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// VERSION: 0.1.1
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// URL: https://github.com/RobTillaart/Arduino/tree/master/libraries/DAC8551
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// HISTORY:
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// 0.1.0: 2017-12-18 initial version
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// 0.1.1: 2017-12-19 fix begin() bug
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//
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// Released to the public domain
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//
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#include <SPI.h>
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#include <DAC8551.h>
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#define MAXVALUE 0xFFFF
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DAC8551::DAC8551()
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{
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_hwSPI = true;
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}
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DAC8551::DAC8551(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 DAC8551::begin()
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{
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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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pinMode(_slaveSelect, OUTPUT);
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}
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_register = 0;
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_value = 0;
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}
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// value = 0..65535
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void DAC8551::setValue(uint16_t value)
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{
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_value = value;
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updateDevice();
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}
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// returns 0..65535
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uint16_t DAC8551::getValue()
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{
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return _value;
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}
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void DAC8551::setPowerDown(uint8_t powerDownMode)
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{
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_register = powerDownMode;
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updateDevice();
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}
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uint8_t DAC8551::getPowerDownMode()
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{
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return _register & 0x03;
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}
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void DAC8551::updateDevice()
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{
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uint8_t configRegister = _register;
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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 >> 8);
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SPI.transfer(_value & 0xFF);
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digitalWrite(_slaveSelect, LOW);
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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 >> 8);
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swSPI_transfer(_value & 0xFF);
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digitalWrite(_slaveSelect, LOW);
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}
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}
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// simple one mode version
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void DAC8551::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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