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王立帮
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arduino-cli/libraries/PCF8591/PCF8591.cpp
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arduino-cli/libraries/PCF8591/PCF8591.cpp
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/**
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* PCF8591 Analog Port Expand
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* https://www.mischianti.org/2019/01/03/pcf8591-i2c-analog-i-o-expander/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Renzo Mischianti www.mischianti.org All right reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "PCF8591.h"
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#include "Wire.h"
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/**
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* Constructor
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* @param address: i2c address
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*/
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PCF8591::PCF8591(uint8_t address){
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_wire = &Wire;
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_address = address;
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};
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#if !defined(__AVR) && !defined(__STM32F1__)
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/**
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*
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* @param address: i2c address
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* @param sda: sda pin
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* @param scl: scl pin
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*/
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PCF8591::PCF8591(uint8_t address, uint8_t sda, uint8_t scl){
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_wire = &Wire;
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_address = address;
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_sda = sda;
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_scl = scl;
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};
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#ifdef ESP32
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/**
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* Constructor
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* @param address: i2c address
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*/
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PCF8591::PCF8591(TwoWire *pWire, uint8_t address){
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_wire = pWire;
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_address = address;
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};
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/**
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*
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* @param address: i2c address
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* @param sda: sda pin
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* @param scl: scl pin
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*/
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PCF8591::PCF8591(TwoWire *pWire, uint8_t address, uint8_t sda, uint8_t scl){
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_wire = pWire;
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_address = address;
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_sda = sda;
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_scl = scl;
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};
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#endif
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#endif
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/**
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* wake up i2c controller
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*/
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void PCF8591::begin(){
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#ifndef __AVR
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_wire->begin(_sda, _scl);
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#else
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// Default pin for AVR some problem on software emulation
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// #define SCL_PIN _scl
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// #define SDA_PIN _sda
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_wire->begin();
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#endif
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}
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/**
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* Read all analog input in one trasmission
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* @param readType read datasheet for info
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* SINGLE_ENDED_INPUT
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* TREE_DIFFERENTIAL_INPUT
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* TWO_SINGLE_ONE_DIFFERENTIAL_INPUT
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* TWO_DIFFERENTIAL_INPUT
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* @return
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*/
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struct PCF8591::AnalogInput PCF8591::analogReadAll(byte readType){
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DEBUG_PRINTLN("Begin trasmission");
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_wire->beginTransmission(_address); // wake up PCF8591
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byte operation = AUTOINCREMENT_READ | readType | (_outputStatus&OUTPUT_MASK);
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DEBUG_PRINTLN("Write operation");
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_wire->write(operation); // control byte: reads ADC0 then auto-increment
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DEBUG_PRINTLN("End write (If code stop here add pullup resistor on SDA SCL)");
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_wire->endTransmission(); // end tranmission
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DEBUG_PRINTLN("Request response");
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_wire->requestFrom(_address, (uint8_t)5);
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/*uint8_t control =*/_wire->read();
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analogInput.ain0=_wire->read();
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analogInput.ain1=_wire->read();
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analogInput.ain2=_wire->read();
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analogInput.ain3=_wire->read();
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return analogInput;
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};
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/**
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* Read one specified channel
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* @param channel channel or analog identify (if readType is SINGLE_ENDED_INPUT)
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* @param readType read datasheet for info
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* SINGLE_ENDED_INPUT
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* TREE_DIFFERENTIAL_INPUT
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* TWO_SINGLE_ONE_DIFFERENTIAL_INPUT
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* TWO_DIFFERENTIAL_INPUT
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* @return
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*/
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uint8_t PCF8591::analogRead(uint8_t channel, byte readType){
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DEBUG_PRINTLN("Begin trasmission");
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_wire->beginTransmission(_address); // wake up PCF8591
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byte operation = channel | readType| (_outputStatus&OUTPUT_MASK);
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DEBUG_PRINTLN("Write operation");
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_wire->write(operation); // control byte: reads ADC0 then auto-increment
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DEBUG_PRINTLN("End write (If code stop here add pullup resistor on SDA SCL)");
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_wire->endTransmission(); // end tranmission
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DEBUG_PRINTLN("Request response");
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_wire->requestFrom(_address, (uint8_t)2);
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/*uint8_t control = */_wire->read();
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uint8_t ana=_wire->read();
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return ana;
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};
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/**
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* Read voltage of analog input
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* @param analogPin (Analog identifier)
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* @param microcontrollerReferenceVoltage get voltage from microcontroller voltage (only AVR no esp8266 for esp 3.3v fixed)
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* @param referenceVoltage if microcontrollerReferenceVoltage false take this value
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* @return
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*/
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float PCF8591::voltageRead(uint8_t analogPin, bool microcontrollerReferenceVoltage, float referenceVoltage){
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float voltageRef = referenceVoltage;
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if (microcontrollerReferenceVoltage) voltageRef = PCF8591::readVcc()/1000.0;
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float ana = PCF8591::analogRead(analogPin);
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return ana*voltageRef/255;
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};
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/**
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* To write votlage on output
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* @param value voltage to write
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* @param microcontrollerReferenceVoltage get voltage from microcontroller voltage (only AVR no esp8266 for esp 3.3v fixed)
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* @param referenceVoltage if microcontrollerReferenceVoltage false take this value
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*/
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void PCF8591::voltageWrite(float value, bool microcontrollerReferenceVoltage, float referenceVoltage){
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if (microcontrollerReferenceVoltage) referenceVoltage = PCF8591::readVcc()/1000.0;
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uint8_t ana = value*255/referenceVoltage;
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PCF8591::analogWrite(ana);
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};
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/**
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* Write value on output pin
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* @param value votlage in volts
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*/
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void PCF8591::analogWrite(uint8_t value){
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_outputStatus = ENABLE_OUTPUT;
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DEBUG_PRINTLN("Begin trasmission");
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_wire->beginTransmission(_address);
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DEBUG_PRINTLN("Write operation");
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_wire->write(ENABLE_OUTPUT); // sets the PCF8591 into a DA mode
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DEBUG_PRINTLN("Write value");
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_wire->write(value); // sets the output
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DEBUG_PRINTLN("End write (If code stop here add pullup resistor on SDA SCL)");
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_wire->endTransmission();
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};
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long PCF8591::readVcc(void) {
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#ifdef __AVR
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// Read 1.1V reference against AVcc
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// set the reference to Vcc and the measurement to the internal 1.1V reference
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#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
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#elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
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ADMUX = _BV(MUX5) | _BV(MUX0);
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#else
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ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
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#endif
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delay(2); // Wait for Vref to settle
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ADCSRA |= _BV(ADSC); // Start conversion
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while (bit_is_set(ADCSRA, ADSC))
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; // measuring
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uint8_t low = ADCL; // must read ADCL first - it then locks ADCH
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uint8_t high = ADCH; // unlocks both
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long result = (high << 8) | low;
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result = 1083630L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
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// scale_constant = internal1.1Ref * 1023 * 1000
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// internal1.1Ref = 1.1 * Vcc1 (per voltmeter) / Vcc2 (per readVcc() function)
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return result; // Vcc in millivolts
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#else
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// float vdd = readVcc(); // ESP.getVdd33(); //ESP.getVcc();
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return 3300;
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#endif
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}
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