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max7318.cpp
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max7318.cpp
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#include <stdio.h>
#include <inttypes.h>
#include <Arduino.h>
#include "max7318.h"
#include <../Wire/Wire.h>//this chip uses wire
max7318::max7318(){
}
max7318::max7318(const uint8_t adrs){
postSetup(adrs);
}
void max7318::postSetup(const uint8_t adrs){
if (adrs >= 0x20 && adrs <= 0x27){//basic addressing
_adrs = adrs;
_error = false;
} else if (adrs >= 0x28 && adrs <= 0xDE){//advanced addressing
//todo
_error = false;
} else {
_error = true;
}
//setup register values for this chip
IODIR = 0x06;//Configuration Registers (0x06..0x07)
GPPU = 0x02;//Output Port Registers (0x02..0x03)
GPIO = 0x00;//Input Port Registers (0x00..0x01)
IPOL = 0x04;//Polarity Inversion Registers (0x04..0x05)(
}
void max7318::begin(bool protocolInitOverride) {
if (!protocolInitOverride && !_error){
Wire.begin();
#if ARDUINO >= 157
Wire.setClock(400000UL); // Set I2C frequency to 400kHz
#else
TWBR = ((F_CPU / 400000UL) - 16) / 2; // Set I2C frequency to 400kHz
#endif
}
delay(100);
_gpioDirection = 0xFFFF;//all in
_gpioState = 0x0000;//all low
}
uint16_t max7318::readAddress(byte addr){
byte low_byte = 0;
byte high_byte = 0;
if (!_error){
Wire.beginTransmission(_adrs);
Wire.write(addr);//witch register?
Wire.endTransmission();
Wire.requestFrom((uint8_t)_adrs,(uint8_t)2);
low_byte = Wire.read();
high_byte = Wire.read();
}
return byte2word(high_byte,low_byte);
}
void max7318::gpioPinMode(uint16_t mode){
if (mode == INPUT){
_gpioDirection = 0xFFFF;
} else if (mode == OUTPUT){
_gpioDirection = 0x0000;
_gpioState = 0x0000;
} else {
_gpioDirection = mode;
}
writeWord(IODIR,_gpioDirection);
}
void max7318::gpioPinMode(uint8_t pin, bool mode){
if (pin < 16){//0...15
mode == INPUT ? _gpioDirection |= (1 << pin) :_gpioDirection &= ~(1 << pin);
writeWord(IODIR,_gpioDirection);
}
}
void max7318::gpioPort(uint16_t value){
if (value == HIGH){
_gpioState = 0xFFFF;
} else if (value == LOW){
_gpioState = 0x0000;
} else {
_gpioState = value;
}
writeWord(GPIO,_gpioState);
}
void max7318::gpioPort(byte lowByte, byte highByte){
_gpioState = byte2word(highByte,lowByte);
writeWord(GPIO,_gpioState);
}
uint16_t max7318::readGpioPort(){
return readAddress(GPIO);
}
uint16_t max7318::readGpioPortFast(){
return _gpioState;
}
int max7318::gpioDigitalReadFast(uint8_t pin){
int temp = 0;
if (pin < 16) temp = bitRead(_gpioState,pin);
return temp;
}
void max7318::gpioDigitalWrite(uint8_t pin, bool value){
if (pin < 16){//0...15
value == HIGH ? _gpioState |= (1 << pin) : _gpioState &= ~(1 << pin);
writeWord(GPPU,_gpioState);
}
}
void max7318::gpioDigitalWriteFast(uint8_t pin, bool value){
if (pin < 16){//0...15
value == HIGH ? _gpioState |= (1 << pin) : _gpioState &= ~(1 << pin);
}
}
void max7318::gpioPortUpdate(){
writeWord(GPIO,_gpioState);
}
int max7318::gpioDigitalRead(uint8_t pin){
if (pin < 16) return (int)(readAddress(GPIO) & 1 << pin);
return 0;
}
uint8_t max7318::gpioRegisterReadByte(byte reg){
uint8_t data = 0;
if (!_error){
Wire.beginTransmission(_adrs);
Wire.write(reg);
Wire.endTransmission();
Wire.requestFrom((uint8_t)_adrs,(uint8_t)1);
data = Wire.read();
}
return data;
}
void max7318::gpioRegisterWriteByte(byte reg,byte data){
writeByte(reg,(byte)data);
}
void max7318::gpioRegisterWriteWord(byte reg,word data){
writeWord(reg,(word)data);
}
/* ------------------------------ Low Level ----------------*/
void max7318::writeByte(byte addr, byte data){
if (!_error){
Wire.beginTransmission(_adrs);
Wire.write(addr);//witch register?
Wire.write(data);
Wire.endTransmission();
}
}
void max7318::writeWord(byte addr, uint16_t data){
if (!_error){
Wire.beginTransmission(_adrs);
Wire.write(addr);//witch register?
//Wire.write(word2lowByte(data));
//Wire.write(word2highByte(data));
Wire.write(data >> 8);
Wire.write(data & 0xFF);
Wire.endTransmission();
}
}