89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/*
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* "PE4302.h"
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*
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* Added to the "TinySA" program in Version 1.1 by John Price (WA2FZW):
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*
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* This is the header file for the PE4302 class.
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*/
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#ifndef PE4302_H_
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#define PE4302_H_ // Prevent double inclusion
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#include <Arduino.h> // General Arduino definitions
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#include <Wire.h> // I2C library
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#include <SPI.h> // Serial Peripheral Interface library
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#include "simpleSA.h"
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/*
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* In order to save GPIO pins on the ESP32, Glenn (VK3PE) and I decided to use a
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* PCF8574 GPIO expander chip between the processor and the parallel version of
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* of the PE4302 attenuator. We know some PE4302 modules are available with a
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* serial interface, but the ones we happen to have only support the parallel
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* interface. This lets us control it over the I2C bus.
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*
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* It's not clear to me that the native serial interface to the serial module
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* is an I2C interface, but we will also support that via a bit-banging techique.
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* We will also support the parallel interface module without the PCF8574.
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*/
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enum { PCF, P, S }; // Symbols for operational modes
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class PE4302
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{
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public:
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/*
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* Function prototypes for the PE4302 available to the outside world:
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*
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* Constructors:
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*/
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explicit PE4302 ( SPIClass* spi, int le ); // For serial interface
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explicit PE4302 ( int address ); // For PCF8574 interface
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explicit PE4302 ( int c16, int c8, int c4, // For parallel interface
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int c2, int c1, int c0 );
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void Init (); // Initialize the module
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bool SetAtten ( int8_t atten ); // Set the attenuation
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int GetAtten (); // Get the current attenuation
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private:
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uint8_t _pcf_I2C; // I2C address for the PCF8574
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uint8_t _interface; // Interface type ( PCF, P or S )
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uint8_t _le_Pin; // Enable (LE) pin for serial or parallel interdace
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uint8_t _parallel_Pins[6]; // Pin numbers ( c0 - c16 ) for parallel interface
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int16_t _atten; // Current attenuator setting ( 0 - 31 dB ) x 2
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SPIClass* _spi; // Pointer to the SPI object used for serial mode
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};
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/*
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* This is a stripped down version of the PCF8574 library. We only need the
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* constructor, the "begin" function (slightly modified from the original
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* library), the "write8" functions and a couple of the variables.
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*/
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class PCF8574
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{
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public:
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explicit PCF8574 ( const uint8_t deviceAddress );
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void begin ( const uint8_t deviceAddress, uint8_t val );
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void write8 ( const uint8_t value );
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private:
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uint8_t _address; // PCF8574 I2C address
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uint8_t _dataOut; // Data to be sent
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};
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#endif
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