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90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
#pragma once
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//
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// FILE: PCF8591.h
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// AUTHOR: Rob Tillaart
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// DATE: 2020-03-12
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// VERSION: 0.4.0
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// PURPOSE: Arduino Library for PCF8591 I2C 4 channel 8 bit ADC + 1 channel 8 bit DAC.
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// URL: https://github.com/RobTillaart/PCF8591
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#include "Arduino.h"
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#include "Wire.h"
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#define PCF8591_LIB_VERSION (F("0.4.0"))
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#define PCF8591_OK 0x00
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#define PCF8591_PIN_ERROR 0x81
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#define PCF8591_I2C_ERROR 0x82
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#define PCF8591_MODE_ERROR 0x83
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#define PCF8591_CHANNEL_ERROR 0x84
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#define PCF8591_ADDRESS_ERROR 0x85
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// datasheet figure 4 page 6
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#define PCF8591_FOUR_SINGLE_CHANNEL 0x00 // default
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#define PCF8591_THREE_DIFFERENTIAL 0x01
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#define PCF8591_MIXED 0x02
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#define PCF8591_TWO_DIFFERENTIAL 0x03
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class PCF8591
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{
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public:
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explicit PCF8591(uint8_t address = 0x48, TwoWire *wire = &Wire);
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// set initial value for DAC, default 0
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bool begin(uint8_t value = 0);
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bool isConnected();
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uint8_t getAddress();
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// ADC PART
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// auto increment not tested ==> use with care!
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void enableINCR();
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void disableINCR();
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bool isINCREnabled();
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// read() returns the value.
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// mode 0 = PCF8591_FOUR_SINGLE_CHANNEL
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uint8_t read(uint8_t channel, uint8_t mode = 0);
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// read4() returns PCF8591_OK or an error code.
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uint8_t read4();
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// access the 4 channels read with read4()
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uint8_t lastRead(uint8_t channel);
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// datasheet par 8.2 figure 4
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// not for PCF8591_MIXED mode.
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// comparator calls need testing.
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int readComparator_01(); // channel 0 mode 3
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int readComparator_23(); // channel 1 mode 3
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int readComparator_03(); // channel 0 mode 1
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int readComparator_13(); // channel 1 mode 1
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// DAC PART
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void enableDAC();
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void disableDAC();
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bool isDACEnabled();
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bool write(uint8_t value = 0); // returns true on success.
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uint8_t lastWrite(); // returns last successful write
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// ERROR HANDLING
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int lastError();
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private:
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uint8_t _address;
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uint8_t _control;
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uint8_t _dac;
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uint8_t _adc[4];
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int _error;
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TwoWire* _wire;
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};
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// -- END OF FILE --
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