DigitalPotentiometer.cpp

#include "DigitalPotentiometer.h"

DigitalPotentiometer::DigitalPotentiometer(PinName csPin) : _spi(p5, p6, p7), _cs(csPin)
{
    _cs = 0;

    //Increase the frequency when external pull ups are used
    _spi.format(8,3);
    _spi.frequency(1000000);
}

int DigitalPotentiometer::increment() {
    _cs = 1;
    
    //  send in the address and value via SPI:
    char ret1 = _spi.write(0x04);

    _cs = 0;
    return ret1;
}

int DigitalPotentiometer::decrement() {
    _cs = 1;
    
    //  send in the address and value via SPI:
    char ret1 = _spi.write(0x08);
    
    _cs = 0;
    return ret1;
}

int DigitalPotentiometer::readTCON() {
    _cs = 1;
    
    //  send in the address and value via SPI:
    char ret1 = _spi.write(0x4C);
    char ret2 = _spi.write(0x00);
    
    _cs = 0;
    return ret1;
}

int DigitalPotentiometer::initTCON() {
    _cs = 1;
    
    //  send in the address and value via SPI:
    char ret1 = _spi.write(0x41);
    char ret2 = _spi.write(0x0F);
    
    _cs = 0;
    return ret1;
}

int DigitalPotentiometer::readStatus() {
    _cs = 1;
    
    //  send in the address and value via SPI:
    char ret1 = _spi.write(0x5C);
    char ret2 = _spi.write(0x00);
    
    _cs = 0;
    return ret1;
}

int DigitalPotentiometer::setTap(int value) {
    _cs = 1;

    //  send in the address and value via SPI:
    char h = 0x03 & (value >> 8);
    char l = 0x00FF & value;
    
    //Serial.print("HIGH: ");
    //Serial.println(h, BIN);
    //Serial.print("LOW: ");
    //Serial.println(l, BIN);
    
    char ret1 = _spi.write(h);
    char ret2 = _spi.write(l);

    _cs = 0;    
    return (ret1 << 8) | ret2;
}