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0.1.2 MCP_DAC
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rob tillaart
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@ -1,7 +1,7 @@
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//
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// FILE: MCP_DAC.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.1
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// VERSION: 0.1.2
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// DATE: 2021-02-03
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// PURPOSE: Arduino library for MCP_DAC
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// URL: https://github.com/RobTillaart/MCP_DAC
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@ -9,6 +9,10 @@
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// HISTORY
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// 0.1.0 2021-02-03 initial version
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// 0.1.1 2021-05-26 moved SPI.begin() from constructor to begin()
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// 0.1.2 2021-07-29 VSPI / HSPI support for ESP32 (default pins only
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// faster software SPI
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// minor optimizations / refactor
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#include "MCP_DAC.h"
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@ -17,17 +21,10 @@ MCP_DAC::MCP_DAC(uint8_t dataOut, uint8_t clock)
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{
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_dataOut = dataOut;
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_clock = clock;
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_select = 0;
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_hwSPI = (dataOut == 255) || (clock == 255);
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if (_hwSPI == false)
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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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_channels = 1;
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_maxValue = 255;
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_select = 0;
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reset();
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}
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@ -47,13 +44,48 @@ void MCP_DAC::begin(uint8_t select)
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_select = select;
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pinMode(_select, OUTPUT);
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digitalWrite(_select, HIGH);
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_spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);
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if (_hwSPI)
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{
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SPI.begin();
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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->begin(14, 12, 13, _select); // CLK MISO MOSI SELECT
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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->begin(18, 19, 23, _select); // CLK MISO MOSI SELECT
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}
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#else // generic SPI
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mySPI = &SPI;
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mySPI->begin();
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#endif
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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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}
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#if defined(ESP32)
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void MCP_DAC::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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mySPI->begin(_clock, miso, _dataOut, _select); // CLK MISO MOSI SELECT
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}
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#endif
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bool MCP_DAC::setGain(uint8_t gain)
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{
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if ((0 < gain) && (gain < 2)) return false;
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@ -121,9 +153,12 @@ void MCP_DAC::setLatchPin(uint8_t latchPin)
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void MCP_DAC::triggerLatch()
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{
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digitalWrite(_latchPin, HIGH);
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delayMicroseconds(1); // 100 ns - Page 7
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digitalWrite(_latchPin, LOW);
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if (_latchPin != 255)
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{
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digitalWrite(_latchPin, HIGH);
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delayMicroseconds(1); // 100 ns - Page 7
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digitalWrite(_latchPin, LOW);
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}
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}
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@ -134,16 +169,27 @@ void MCP_DAC::shutDown()
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}
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void MCP_DAC::setSPIspeed(uint32_t speed)
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{
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_SPIspeed = speed;
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_spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);
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};
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//////////////////////////////////////////////////////////////////
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void MCP_DAC::transfer(uint16_t data)
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{
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// DATA TRANSFER
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digitalWrite(_select, LOW);
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if (_hwSPI)
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{
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SPI.beginTransaction(SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0));
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SPI.transfer((uint8_t)(data >> 8));
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SPI.transfer((uint8_t)(data & 0xFF));
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SPI.endTransaction();
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// mySPI->beginTransaction(SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0));
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mySPI->beginTransaction(_spi_settings);
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mySPI->transfer((uint8_t)(data >> 8));
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mySPI->transfer((uint8_t)(data & 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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@ -155,13 +201,15 @@ void MCP_DAC::transfer(uint16_t data)
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// MSBFIRST
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uint8_t MCP_DAC::swSPI_transfer(uint8_t val)
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uint8_t MCP_DAC::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)
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{
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digitalWrite(_dataOut,(val & mask) != 0);
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digitalWrite(_clock, HIGH);
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digitalWrite(_clock, LOW);
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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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return 0;
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}
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@ -2,7 +2,7 @@
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//
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// FILE: MCP_DAC.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.1
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// VERSION: 0.1.2
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// DATE: 2021-02-03
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// PURPOSE: Arduino library for MCP_DAC
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// URL: https://github.com/RobTillaart/MCP_DAC
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@ -13,7 +13,8 @@
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#include "SPI.h"
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#define MCP_DAC_LIB_VERSION (F("0.1.1"))
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#define MCP_DAC_LIB_VERSION (F("0.1.2"))
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///////////////////////////////////////////////////////////////
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@ -53,8 +54,8 @@ public:
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bool isActive() { return _active; };
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// speed in Hz
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void setSPIspeed(uint32_t speed) { _SPIspeed = speed; };
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uint32_t getSPIspeed() { return _SPIspeed; };
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void setSPIspeed(uint32_t speed);
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uint32_t getSPIspeed() { return _SPIspeed; };
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//
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// MCP49xxx series only
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@ -67,6 +68,15 @@ public:
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void reset();
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bool usesHWSPI() { return _hwSPI; };
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// ESP32 specific
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#if defined(ESP32)
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void selectHSPI() { _useHSPI = true; };
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void selectVSPI() { _useHSPI = false; };
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bool usesHSPI() { return _useHSPI; };
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bool usesVSPI() { return !_useHSPI; };
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// to overrule ESP32 default hw pins...
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void setGPIOpins(uint8_t clk, uint8_t miso, uint8_t mosi, uint8_t select);
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#endif
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protected:
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uint8_t _dataOut;
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@ -85,6 +95,13 @@ protected:
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void transfer(uint16_t data);
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uint8_t swSPI_transfer(uint8_t d);
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SPIClass * mySPI;
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SPISettings _spi_settings;
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#if defined(ESP32)
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bool _useHSPI = true;
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#endif
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};
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@ -105,12 +105,21 @@ MCP49xxx series only, see page 20 ==> not functional for MCP48xx series.
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- **bool usesHWSPI()** returns true if HW SPI is used.
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### ESP32 specific
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- **void selectHSPI()** in case hardware SPI, the ESP32 has two options HSPI and VSPI.
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- **void selectVSPI()** see above.
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- **bool usesHSPI()** returns true if HSPI is used.
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- **bool usesVSPI()** returns true if VSPI is used.
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## Future
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- test test test and ....
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- **incr(channel)** increases until max value is reached.
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- **decr(channel)** decreases until 0 is reached.
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- set gpio pins of the ESP32 for hardware SPI
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- ...
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## Operation
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@ -43,6 +43,11 @@ getSPIspeed KEYWORD2
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setBufferedMode KEYWORD2
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getBufferedMode KEYWORD2
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selectHSPI KEYWORD2
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selectVSPI KEYWORD2
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usesHSPI KEYWORD2
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usesVSPI KEYWORD2
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setGPIOpins KEYWORD2
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# Instances (KEYWORD2)
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@ -15,7 +15,7 @@
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"type": "git",
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"url": "https://github.com/RobTillaart/MCP_DAC"
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},
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"version": "0.1.1",
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"version": "0.1.2",
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"license": "MIT",
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"frameworks": "arduino",
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"platforms": "*"
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@ -1,5 +1,5 @@
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name=MCP_DAC
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version=0.1.1
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version=0.1.2
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author=Rob Tillaart <rob.tillaart@gmail.com>
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maintainer=Rob Tillaart <rob.tillaart@gmail.com>
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sentence=Arduino library for Microchip SPI DAC, 8, 10, 12 bit; 1 or 2 channel.
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