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411 lines
7.7 KiB
C++
411 lines
7.7 KiB
C++
//
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// FILE: AD985X.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.4.0
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// DATE: 2019-02-08
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// PURPOSE: Class for AD9850 and AD9851 function generator
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// URL: https://github.com/RobTillaart/AD985X
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#include "AD985X.h"
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// UNO HARDWARE SPI PINS
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#define SPI_CLOCK 13 // not portable.
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#define SPI_MISO 12
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#define SPI_MOSI 11
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#define AD985X_POWERDOWN 0x04
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////////////////////////////////////////////////////////
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//
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// AD9850
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//
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// HARDWARE SPI
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// spiClock needed for RESET(). TODO: nicer solution?
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AD9850::AD9850(uint8_t slaveSelect, uint8_t resetPin, uint8_t FQUDPin, __SPI_CLASS__ * mySPI, uint8_t spiClock)
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{
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_select = slaveSelect;
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_reset = resetPin;
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_fqud = FQUDPin;
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_hwSPI = true;
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_mySPI = mySPI;
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_dataOut = 0;
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_clock = spiClock;
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}
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// SOFTWARE SPI
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AD9850::AD9850(uint8_t slaveSelect, uint8_t resetPin, uint8_t FQUDPin, uint8_t spiData, uint8_t spiClock)
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{
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_select = slaveSelect;
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_reset = resetPin;
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_fqud = FQUDPin;
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_hwSPI = false;
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_mySPI = NULL;
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_dataOut = 0;
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_clock = spiClock;
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}
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void AD9850::begin()
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{
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// following 3 are always set.
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pinMode(_select, OUTPUT);
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pinMode(_reset, OUTPUT);
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pinMode(_fqud, OUTPUT);
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pinMode(_clock, OUTPUT);
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// device select = HIGH See - https://github.com/RobTillaart/AD985X/issues/13
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digitalWrite(_select, LOW);
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digitalWrite(_reset, LOW);
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digitalWrite(_fqud, LOW);
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digitalWrite(_clock, LOW);
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_spi_settings = SPISettings(2000000, LSBFIRST, SPI_MODE0);
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if (_hwSPI)
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{
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_mySPI->end();
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_mySPI->begin();
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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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digitalWrite(_dataOut, LOW);
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}
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reset();
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}
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void AD9850::reset()
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{
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// be sure to select the correct device
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digitalWrite(_select, HIGH);
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pulsePin(_reset);
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pulsePin(_clock);
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digitalWrite(_select, LOW);
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_config = 0; // 0 phase no power down
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_freq = 0;
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_factor = 0;
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_offset = 0;
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_autoUpdate = true;
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writeData();
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}
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void AD9850::powerDown()
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{
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_config |= AD985X_POWERDOWN; // keep phase and REFCLK as is.
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writeData();
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}
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void AD9850::powerUp()
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{
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_config &= ~AD985X_POWERDOWN;
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writeData();
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}
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bool AD9850::setPhase(uint8_t phase)
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{
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if (phase > 31) return false;
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_config &= 0x07; // keep last three bits
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_config |= (phase << 3); // set new phase
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writeData();
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return true;
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}
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uint8_t AD9850::getPhase()
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{
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return (_config >> 3);
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}
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void AD9850::pulsePin(uint8_t pin)
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{
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digitalWrite(pin, HIGH);
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digitalWrite(pin, LOW);
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}
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void AD9850::setSPIspeed(uint32_t speed)
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{
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_SPIspeed = speed;
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_spi_settings = SPISettings(_SPIspeed, LSBFIRST, SPI_MODE0);
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};
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void AD9850::writeData()
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{
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// Serial.println(_factor, HEX);
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// Serial.println(_config, HEX);
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uint32_t data = _factor;
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// used for multi device configuration only
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// see https://github.com/RobTillaart/AD985X/issues/13
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digitalWrite(_select, HIGH);
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if (_hwSPI)
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{
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_mySPI->beginTransaction(_spi_settings);
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_mySPI->transfer(data & 0xFF);
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data >>= 8;
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_mySPI->transfer(data & 0xFF);
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data >>= 8;
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_mySPI->transfer(data & 0xFF);
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_mySPI->transfer(data >> 8);
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_mySPI->transfer(_config & 0xFC); // mask factory test bit
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_mySPI->endTransaction();
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}
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else
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{
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swSPI_transfer(data & 0xFF);
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data >>= 8;
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swSPI_transfer(data & 0xFF);
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data >>= 8;
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swSPI_transfer(data & 0xFF);
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swSPI_transfer(data >> 8);
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swSPI_transfer(_config & 0xFC); // mask factory test bit
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}
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digitalWrite(_select, LOW);
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// update frequency + phase + control bits.
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// should at least be 4 ns delay - P14 datasheet
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if (_autoUpdate) update();
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}
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// simple one mode version
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void AD9850::swSPI_transfer(uint8_t val)
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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) // MSBFIRST
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for (uint8_t mask = 0x01; mask; mask <<= 1) // LSBFIRST
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{
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digitalWrite(dao, (val & 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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bool AD9850::setFrequency(uint32_t freq)
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{
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bool rv = true;
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// freq OUT = (Δ Phase × CLKIN)/2^32
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// 64 bit math to keep precision to the max
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if (freq > AD9850_MAX_FREQ)
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{
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rv = false;
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freq = AD9850_MAX_FREQ;
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}
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// _factor = round(freq * 34.359738368); // 4294967296 / 125000000
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_factor = (147573952589ULL * freq) >> 32;
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_freq = freq;
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_factor += _offset;
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writeData();
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return rv;
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}
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// especially for lower frequencies (with decimals)
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bool AD9850::setFrequencyF(float freq)
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{
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bool rv = true;
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// freq OUT = (Δ Phase × CLKIN)/2^32
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// 64 bit math to keep precision to the max
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if (freq > AD9850_MAX_FREQ)
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{
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rv = false;
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freq = AD9850_MAX_FREQ;
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}
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_factor = round(freq * 34.359738368); // 4294967296 / 125000000
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_freq = freq;
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_factor += _offset;
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writeData();
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return rv;
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}
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float AD9850::getFrequency()
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{
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return _freq;
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}
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uint32_t AD9850::getMaxFrequency()
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{
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return AD9850_MAX_FREQ;
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}
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void AD9850::update()
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{
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digitalWrite(_select, HIGH);
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pulsePin(_fqud);
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digitalWrite(_select, LOW);
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}
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////////////////////////////////////////////////////////
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//
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// AD9851
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//
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// bit is a 6x multiplier bit P.14 datasheet
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#define AD9851_REFCLK 0x01
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AD9851::AD9851(uint8_t slaveSelect, uint8_t resetPin, uint8_t FQUDPin, __SPI_CLASS__ * mySPI, uint8_t spiClock) : AD9850(slaveSelect, resetPin, FQUDPin, mySPI, spiClock)
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{
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}
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AD9851::AD9851(uint8_t slaveSelect, uint8_t resetPin, uint8_t FQUDPin, uint8_t spiData, uint8_t spiClock) : AD9850(slaveSelect, resetPin, FQUDPin, spiData, spiClock)
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{
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}
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bool AD9851::setFrequency(uint32_t freq)
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{
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bool rv = true;
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// PREVENT OVERFLOW
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if (freq > AD9851_MAX_FREQ)
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{
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rv = false;
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freq = AD9851_MAX_FREQ;
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}
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// AUTO SWITCH REFERENCE FREQUENCY
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if (_autoRefClock)
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{
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if (freq > _ARCCutOffFreq)
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{
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_config |= AD9851_REFCLK;
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}
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else
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{
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_config &= ~AD9851_REFCLK;
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}
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}
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if (_config & AD9851_REFCLK) // 6x 30 = 180 MHz
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{
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_factor = (102481911520ULL * freq) >> 32; // (1 << 64) / 180000000
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}
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else // 1x 30 = 30 MHz
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{
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_factor = (614891469123ULL * freq) >> 32; // (1 << 64) / 30000000
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}
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_freq = freq;
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_factor += _offset;
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writeData();
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return rv;
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}
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// especially for lower frequencies (with decimals)
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bool AD9851::setFrequencyF(float freq)
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{
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bool rv = true;
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// PREVENT OVERFLOW
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if (freq > AD9851_MAX_FREQ)
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{
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rv = false;
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freq = AD9851_MAX_FREQ;
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}
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// AUTO SWITCH REFERENCE FREQUENCY
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if (_autoRefClock)
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{
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if (freq > _ARCCutOffFreq)
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{
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_config |= AD9851_REFCLK;
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}
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else
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{
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_config &= ~AD9851_REFCLK;
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}
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}
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if (_config & AD9851_REFCLK) // 6x 30 = 180 MHz
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{
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_factor = uint64_t(102481911520ULL * freq) >> 32; // (1 << 64) / 180000000
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}
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else // 1x 30 = 30 MHz
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{
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_factor = (6148914691ULL * uint64_t (100 * freq)) >> 32;
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}
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_freq = freq;
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_factor += _offset;
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writeData();
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return rv;
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}
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uint32_t AD9851::getMaxFrequency()
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{
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return AD9851_MAX_FREQ;
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};
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////////////////////////////////////////////////////////
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//
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// AD9851 - AUTO REFERENCE CLOCK
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//
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void AD9851::setAutoRefClock(bool arc)
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{
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_autoRefClock = arc;
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setFrequency(_freq);
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};
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bool AD9851::getAutoRefClock()
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{
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return _autoRefClock;
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};
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void AD9851::setRefClockHigh()
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{
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_config |= AD9851_REFCLK;
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setFrequency(_freq);
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}
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void AD9851::setRefClockLow()
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{
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_config &= ~AD9851_REFCLK;
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setFrequency(_freq);
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}
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uint8_t AD9851::getRefClock()
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{
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return (_config & AD9851_REFCLK) ? 180 : 30;
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}
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void AD9851::setARCCutOffFreq(uint32_t Hz)
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{
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if (Hz > 30000000UL) Hz = 30000000;
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_ARCCutOffFreq = Hz;
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};
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uint32_t AD9851::getARCCutOffFreq()
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{
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return _ARCCutOffFreq;
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};
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// -- END OF FILE --
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