mirror of
https://github.com/RobTillaart/Arduino.git
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320 lines
6.6 KiB
C++
320 lines
6.6 KiB
C++
//
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// FILE: AD985X.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.3.0
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// DATE: 2019-02-08
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// PURPOSE: Class for AD9850 and AD9851 function generator
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//
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// HISTORY:
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// 0.1.0 2019-03-19 initial version
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// 0.1.1 2020-12-09 add arduino-ci
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// 0.1.2 2020-12-27 add setAutoMode() + offset
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// 0.2.0 2020-12-28 major refactor class hierarchy + float frequency
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// 0.2.1 2021-01-10 add get- and setARCCutOffFreq()
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// 0.2.2 2021-01-24 add manual updating frequency
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// get- setManualFQ_UD(), update()
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// inverted SELECT line as preparation for multidevice.
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// 0.3.0 2021-06-06 fix factory bit mask + new examples + some refactor
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// added multi device document
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#include "AD985X.h"
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// UNO HARDWARE SPI PINS
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#define SPI_CLOCK 13
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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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AD9850::AD9850()
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{
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}
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void AD9850::begin(uint8_t select, uint8_t resetPin, uint8_t FQUDPin, uint8_t dataOut , uint8_t clock)
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{
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_select = select;
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_reset = resetPin;
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_fqud = FQUDPin;
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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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digitalWrite(_select, LOW); // device select = HIGH See - https://github.com/RobTillaart/AD985X/issues/13
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digitalWrite(_reset, LOW);
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digitalWrite(_fqud, LOW);
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_useHW = true;
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// SW SPI
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if ((dataOut != 0) && (clock != 0))
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{
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_dataOut = dataOut;
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_clock = clock;
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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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_useHW = false;
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}
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if (_useHW)
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{
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SPI.begin(); // set MOSI & MISO pin right.
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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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digitalWrite(_select, HIGH); // be sure to select the correct device
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pulsePin(_reset);
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if (_useHW) pulsePin(SPI_CLOCK);
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else pulsePin(_clock);
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digitalWrite(_select, LOW);
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_config = 0; // 0 phase no powerdown
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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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void AD9850::setPhase(uint8_t phase)
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{
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if (phase > 31) return;
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_config &= 0x07;
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_config |= (phase << 3);
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writeData();
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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::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 multidevice config only - https://github.com/RobTillaart/AD985X/issues/13
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digitalWrite(_select, HIGH);
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if (_useHW)
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{
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SPI.beginTransaction(SPISettings(2000000, LSBFIRST, SPI_MODE0));
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SPI.transfer(data & 0xFF);
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data >>= 8;
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SPI.transfer(data & 0xFF);
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data >>= 8;
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SPI.transfer(data & 0xFF);
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SPI.transfer(data >> 8);
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SPI.transfer(_config & 0xFC); // mask factory test bit
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SPI.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 value)
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{
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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(_dataOut,(value & mask) != 0);
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digitalWrite(_clock, HIGH);
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digitalWrite(_clock, LOW);
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}
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}
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void AD9850::setFrequency(uint32_t freq)
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{
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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) freq = AD9850_MAX_FREQ;
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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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}
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// especially for lower frequencies (with decimals)
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void AD9850::setFrequencyF(float freq)
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{
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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) freq = AD9850_MAX_FREQ;
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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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}
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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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#define AD9851_REFCLK 0x01 // bit is a 6x multiplier bit P.14 datasheet
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void AD9851::setFrequency(uint32_t freq)
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{
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// PREVENT OVERFLOW
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if (freq > AD9851_MAX_FREQ) freq = AD9851_MAX_FREQ;
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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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}
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// especially for lower frequencies (with decimals)
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void AD9851::setFrequencyF(float freq)
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{
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// PREVENT OVERFLOW
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if (freq > AD9851_MAX_FREQ) freq = AD9851_MAX_FREQ;
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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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}
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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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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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// -- END OF FILE --
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