mirror of
https://github.com/RobTillaart/Arduino.git
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167 lines
3.0 KiB
C++
167 lines
3.0 KiB
C++
//
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// FILE: DAC8550.cpp
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// AUTHOR: Rob Tillaart
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// PURPOSE: Arduino library for DAC8550 SPI Digital Analog Convertor
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// VERSION: 0.1.3
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// URL: https://github.com/RobTillaart/DAC8550
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//
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// HISTORY: see changelog.md
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#include "DAC8550.h"
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DAC8550::DAC8550(uint8_t slaveSelect)
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{
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_hwSPI = true;
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_select = slaveSelect;
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}
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DAC8550::DAC8550(uint8_t spiData, uint8_t spiClock, uint8_t slaveSelect)
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{
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_hwSPI = false;
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_dataOut = spiData;
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_clock = spiClock;
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_select = 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 DAC8550::begin()
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{
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pinMode(_select, OUTPUT);
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digitalWrite(_select, HIGH);
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_spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE1);
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if(_hwSPI)
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{
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#if defined(ESP32)
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if (_useHSPI) // HSPI
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{
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mySPI = new SPIClass(HSPI);
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mySPI->end();
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mySPI->begin(14, 12, 13, _select); // CLK=14 MISO=12 MOSI=13
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}
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else // VSPI
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{
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mySPI = new SPIClass(VSPI);
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mySPI->end();
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mySPI->begin(18, 19, 23, _select); // CLK=18 MISO=19 MOSI=23
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}
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#else // generic hardware SPI
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mySPI = &SPI;
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mySPI->end();
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mySPI->begin();
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#endif
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delay(1);
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}
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else // software SPI
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{
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pinMode(_dataOut, OUTPUT);
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pinMode(_clock, OUTPUT);
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digitalWrite(_dataOut, LOW);
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digitalWrite(_clock, LOW);
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}
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_register = 0;
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_value = 0;
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}
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#if defined(ESP32)
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void DAC8550::setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select)
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{
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_clock = clk;
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_dataOut = mosi;
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_select = select;
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pinMode(_select, OUTPUT);
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digitalWrite(_select, HIGH);
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mySPI->end(); // disable SPI
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mySPI->begin(clk, miso, mosi, select);
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}
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#endif
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// value = 0..65535
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void DAC8550::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 DAC8550::getValue()
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{
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return _value;
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}
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void DAC8550::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 DAC8550::getPowerDownMode()
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{
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return _register & 0x03;
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}
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void DAC8550::setSPIspeed(uint32_t speed)
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{
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_SPIspeed = speed;
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_spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE1);
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};
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//////////////////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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void DAC8550::updateDevice()
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{
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uint8_t configRegister = _register;
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digitalWrite(_select, LOW);
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if (_hwSPI)
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{
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mySPI->beginTransaction(_spi_settings);
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mySPI->transfer(configRegister);
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mySPI->transfer(_value >> 8);
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mySPI->transfer(_value & 0xFF);
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mySPI->endTransaction();
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}
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else // Software SPI
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{
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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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}
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digitalWrite(_select, HIGH);
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}
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// simple one mode version
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void DAC8550::swSPI_transfer(uint8_t value)
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{
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uint8_t clk = _clock;
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uint8_t dao = _dataOut;
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for (uint8_t mask = 0x80; mask; mask >>= 1)
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{
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digitalWrite(dao,(value & mask));
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digitalWrite(clk, HIGH);
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digitalWrite(clk, LOW);
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}
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}
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// -- END OF FILE --
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