mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
918 lines
17 KiB
C++
918 lines
17 KiB
C++
//
|
|
// FILE: MCP23S17.cpp
|
|
// AUTHOR: Rob Tillaart
|
|
// VERSION: 0.5.4
|
|
// PURPOSE: Arduino library for SPI MCP23S17 16 channel port expander
|
|
// DATE: 2021-12-30
|
|
// URL: https://github.com/RobTillaart/MCP23S17
|
|
|
|
|
|
#include "MCP23S17.h"
|
|
|
|
|
|
// SOFTWARE SPI
|
|
MCP23S17::MCP23S17(uint8_t select, uint8_t dataIn, uint8_t dataOut, uint8_t clock, uint8_t address)
|
|
{
|
|
_address = (address << 1);
|
|
_select = select;
|
|
_dataIn = dataIn;
|
|
_dataOut = dataOut;
|
|
_clock = clock;
|
|
_error = MCP23S17_OK;
|
|
_hwSPI = false;
|
|
}
|
|
|
|
|
|
// HARDWARE SPI
|
|
MCP23S17::MCP23S17(int select, __SPI_CLASS__ * spi)
|
|
{
|
|
MCP23S17(select, 0x00, spi);
|
|
}
|
|
|
|
|
|
MCP23S17::MCP23S17(int select, int address, __SPI_CLASS__ * spi)
|
|
{
|
|
_address = (address << 1);
|
|
_select = select;
|
|
_error = MCP23S17_OK;
|
|
_mySPI = spi;
|
|
_hwSPI = true;
|
|
}
|
|
|
|
|
|
bool MCP23S17::begin(bool pullup)
|
|
{
|
|
::pinMode(_select, OUTPUT);
|
|
::digitalWrite(_select, HIGH);
|
|
|
|
// 8 MHz - datasheet page 8
|
|
_spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);
|
|
|
|
if (_hwSPI)
|
|
{
|
|
// _mySPI->end();
|
|
// _mySPI->begin();
|
|
}
|
|
else
|
|
{
|
|
::pinMode(_dataIn, INPUT);
|
|
::pinMode(_dataOut, OUTPUT);
|
|
::pinMode(_clock, OUTPUT);
|
|
::digitalWrite(_dataOut, LOW);
|
|
::digitalWrite(_clock, LOW);
|
|
}
|
|
|
|
// check connected
|
|
if (! isConnected()) return false;
|
|
|
|
// disable address increment - datasheet P20
|
|
// note that address increment must be enabled for readReg16() and writeReg16() to work.
|
|
// SEQOP: Sequential Operation mode bit
|
|
// 1 = Sequential operation disabled, address pointer does not increment.
|
|
// 0 = Sequential operation enabled, address pointer increments.
|
|
uint8_t reg = readReg(MCP23x17_IOCR);
|
|
if (reg & MCP23x17_IOCR_SEQOP) // check if already zero
|
|
{
|
|
reg &= ~MCP23x17_IOCR_SEQOP; // clear SEQOP bit for sequential read/write
|
|
if (! writeReg(MCP23x17_IOCR, reg)) return false;
|
|
}
|
|
|
|
if (pullup)
|
|
{
|
|
// Force INPUT_PULLUP
|
|
if (! writeReg(MCP23x17_PUR_A, 0xFF)) return false; // 0xFF == all UP
|
|
if (! writeReg(MCP23x17_PUR_B, 0xFF)) return false; // 0xFF == all UP
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// just to keep interface in sync with I2C MCP23017 library.
|
|
bool MCP23S17::isConnected()
|
|
{
|
|
_error = MCP23S17_OK;
|
|
return true;
|
|
}
|
|
|
|
|
|
uint8_t MCP23S17::getAddress()
|
|
{
|
|
return (_address >> 1);
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////
|
|
//
|
|
// single pin interface
|
|
//
|
|
// pin = 0..15
|
|
// mode = INPUT, OUTPUT, INPUT_PULLUP (= same as INPUT)
|
|
// do NOT use 0 or 1 for mode.
|
|
bool MCP23S17::pinMode1(uint8_t pin, uint8_t mode)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
if ((mode != INPUT) && (mode != INPUT_PULLUP) && (mode != OUTPUT))
|
|
{
|
|
_error = MCP23S17_VALUE_ERROR;
|
|
return false;
|
|
}
|
|
|
|
uint8_t dataDirectionRegister = MCP23x17_DDR_A;
|
|
if (pin > 7)
|
|
{
|
|
dataDirectionRegister = MCP23x17_DDR_B;
|
|
pin -= 8;
|
|
}
|
|
uint8_t val = readReg(dataDirectionRegister);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
uint8_t mask = 1 << pin;
|
|
// only work with valid
|
|
if ((mode == INPUT) || (mode == INPUT_PULLUP))
|
|
{
|
|
val |= mask;
|
|
}
|
|
else if (mode == OUTPUT)
|
|
{
|
|
val &= ~mask;
|
|
}
|
|
// other values won't change val ....
|
|
writeReg(dataDirectionRegister, val);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// pin = 0..15
|
|
// value = LOW, HIGH
|
|
bool MCP23S17::write1(uint8_t pin, uint8_t value)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
uint8_t IOR = MCP23x17_GPIO_A;
|
|
if (pin > 7)
|
|
{
|
|
IOR = MCP23x17_GPIO_B;
|
|
pin -= 8;
|
|
}
|
|
|
|
uint8_t val = readReg(IOR);
|
|
uint8_t pre = val;
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
uint8_t mask = 1 << pin;
|
|
if (value)
|
|
{
|
|
val |= mask;
|
|
}
|
|
else
|
|
{
|
|
val &= ~mask;
|
|
}
|
|
// only write when changed.
|
|
if (pre != val)
|
|
{
|
|
writeReg(IOR, val);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
uint8_t MCP23S17::read1(uint8_t pin)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return MCP23S17_INVALID_READ;
|
|
}
|
|
uint8_t IOR = MCP23x17_GPIO_A;
|
|
if (pin > 7)
|
|
{
|
|
IOR = MCP23x17_GPIO_B;
|
|
pin -= 8;
|
|
}
|
|
|
|
uint8_t val = readReg(IOR);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return MCP23S17_INVALID_READ;
|
|
}
|
|
uint8_t mask = 1 << pin;
|
|
if (val & mask) return HIGH;
|
|
return LOW;
|
|
}
|
|
|
|
|
|
// pin = 0..15
|
|
// reversed = true or false
|
|
bool MCP23S17::setPolarity(uint8_t pin, bool reversed)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
uint8_t inputPolarityRegister = MCP23x17_POL_A;
|
|
if (pin > 7)
|
|
{
|
|
inputPolarityRegister = MCP23x17_POL_B;
|
|
pin -= 8;
|
|
}
|
|
uint8_t val = readReg(inputPolarityRegister);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
uint8_t mask = 1 << pin;
|
|
if (reversed)
|
|
{
|
|
val |= mask;
|
|
}
|
|
else
|
|
{
|
|
val &= ~mask;
|
|
}
|
|
writeReg(inputPolarityRegister, val);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool MCP23S17::getPolarity(uint8_t pin, bool &reversed)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
uint8_t inputPolarityRegister = MCP23x17_POL_A;
|
|
if (pin > 7)
|
|
{
|
|
inputPolarityRegister = MCP23x17_POL_B;
|
|
pin -= 8;
|
|
}
|
|
uint8_t val = readReg(inputPolarityRegister);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
uint8_t mask = 1 << pin;
|
|
reversed = (val & mask) > 0;
|
|
return true;
|
|
}
|
|
|
|
|
|
// pin = 0..15
|
|
// pullup = true or false
|
|
bool MCP23S17::setPullup(uint8_t pin, bool pullup)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
uint8_t inputPullupRegister = MCP23x17_PUR_A;
|
|
if (pin > 7)
|
|
{
|
|
inputPullupRegister = MCP23x17_PUR_B;
|
|
pin -= 8;
|
|
}
|
|
uint8_t val = readReg(inputPullupRegister);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
uint8_t mask = 1 << pin;
|
|
if (pullup)
|
|
{
|
|
val |= mask;
|
|
}
|
|
else
|
|
{
|
|
val &= ~mask;
|
|
}
|
|
writeReg(inputPullupRegister, val);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool MCP23S17::getPullup(uint8_t pin, bool &pullup)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
uint8_t inputPullupRegister = MCP23x17_PUR_A;
|
|
if (pin > 7)
|
|
{
|
|
inputPullupRegister = MCP23x17_PUR_B;
|
|
pin -= 8;
|
|
}
|
|
uint8_t val = readReg(inputPullupRegister);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
uint8_t mask = 1 << pin;
|
|
pullup = (val & mask) > 0;
|
|
return true;
|
|
}
|
|
|
|
|
|
void MCP23S17::setSPIspeed(uint32_t speed)
|
|
{
|
|
_SPIspeed = speed;
|
|
_spi_settings = SPISettings(_SPIspeed, MSBFIRST, SPI_MODE0);
|
|
};
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////
|
|
//
|
|
// 8 pins interface
|
|
//
|
|
// whole register at once
|
|
// port = 0..1
|
|
// mask = 0x00..0xFF bit pattern
|
|
// bit 0 = output mode, bit 1 = input mode
|
|
bool MCP23S17::pinMode8(uint8_t port, uint8_t mask)
|
|
{
|
|
if (port > 1)
|
|
{
|
|
_error = MCP23S17_PORT_ERROR;
|
|
return false;
|
|
}
|
|
if (port == 0) writeReg(MCP23x17_DDR_A, mask);
|
|
if (port == 1) writeReg(MCP23x17_DDR_B, mask);
|
|
_error = MCP23S17_OK;
|
|
return true;
|
|
}
|
|
|
|
|
|
// port = 0..1
|
|
bool MCP23S17::write8(uint8_t port, uint8_t value)
|
|
{
|
|
if (port > 1)
|
|
{
|
|
_error = MCP23S17_PORT_ERROR;
|
|
return false;
|
|
}
|
|
if (port == 0) writeReg(MCP23x17_GPIO_A, value);
|
|
if (port == 1) writeReg(MCP23x17_GPIO_B, value);
|
|
_error = MCP23S17_OK;
|
|
return true;
|
|
}
|
|
|
|
|
|
int MCP23S17::read8(uint8_t port)
|
|
{
|
|
if (port > 1)
|
|
{
|
|
_error = MCP23S17_PORT_ERROR;
|
|
return MCP23S17_INVALID_READ;
|
|
}
|
|
_error = MCP23S17_OK;
|
|
if (port == 0) return readReg(MCP23x17_GPIO_A);
|
|
return readReg(MCP23x17_GPIO_B); // port == 1
|
|
}
|
|
|
|
|
|
// port = 0..1
|
|
// mask = 0..0xFF bit pattern
|
|
bool MCP23S17::setPolarity8(uint8_t port, uint8_t mask)
|
|
{
|
|
if (port > 1)
|
|
{
|
|
_error = MCP23S17_PORT_ERROR;
|
|
return false;
|
|
}
|
|
if (port == 0) writeReg(MCP23x17_POL_A, mask);
|
|
if (port == 1) writeReg(MCP23x17_POL_B, mask);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool MCP23S17::getPolarity8(uint8_t port, uint8_t &mask)
|
|
{
|
|
if (port > 1)
|
|
{
|
|
_error = MCP23S17_PORT_ERROR;
|
|
return false;
|
|
}
|
|
if (port == 0) mask = readReg(MCP23x17_POL_A);
|
|
if (port == 1) mask = readReg(MCP23x17_POL_B);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// port = 0..1
|
|
// mask = 0..0xFF bit pattern
|
|
bool MCP23S17::setPullup8(uint8_t port, uint8_t mask)
|
|
{
|
|
if (port > 1)
|
|
{
|
|
_error = MCP23S17_PORT_ERROR;
|
|
return false;
|
|
}
|
|
if (port == 0) writeReg(MCP23x17_PUR_A, mask);
|
|
if (port == 1) writeReg(MCP23x17_PUR_B, mask);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool MCP23S17::getPullup8(uint8_t port, uint8_t &mask)
|
|
{
|
|
if (port > 1)
|
|
{
|
|
_error = MCP23S17_PORT_ERROR;
|
|
return false;
|
|
}
|
|
if (port == 0) mask = readReg(MCP23x17_PUR_A);
|
|
if (port == 1) mask = readReg(MCP23x17_PUR_B);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////
|
|
//
|
|
// 16 pins interface
|
|
//
|
|
// two registers at once
|
|
// mask = 0x0000..0xFFFF bit pattern
|
|
// bit 0 = output mode, bit 1 = input mode
|
|
bool MCP23S17::pinMode16(uint16_t mask)
|
|
{
|
|
writeReg16(MCP23x17_DDR_A, mask);
|
|
_error = MCP23S17_OK;
|
|
return true;
|
|
}
|
|
|
|
|
|
// value = 0x0000..0xFFFF bit pattern
|
|
bool MCP23S17::write16(uint16_t value)
|
|
{
|
|
writeReg16(MCP23x17_GPIO_A, value);
|
|
_error = MCP23S17_OK;
|
|
return true;
|
|
}
|
|
|
|
|
|
// return = 0x0000..0xFFFF bit pattern
|
|
uint16_t MCP23S17::read16()
|
|
{
|
|
_error = MCP23S17_OK;
|
|
uint16_t value = readReg16(MCP23x17_GPIO_A);
|
|
return value;
|
|
}
|
|
|
|
|
|
// mask = 0x0000..0xFFFF bit pattern
|
|
bool MCP23S17::setPolarity16(uint16_t mask)
|
|
{
|
|
writeReg16(MCP23x17_POL_A, mask);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// mask = 0x0000..0xFFFF bit pattern
|
|
bool MCP23S17::getPolarity16(uint16_t &mask)
|
|
{
|
|
mask = readReg16(MCP23x17_POL_A);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// mask = 0x0000..0xFFFF bit pattern
|
|
bool MCP23S17::setPullup16(uint16_t mask)
|
|
{
|
|
writeReg16(MCP23x17_PUR_A, mask);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
// mask = 0x0000..0xFFFF bit pattern
|
|
bool MCP23S17::getPullup16(uint16_t &mask)
|
|
{
|
|
mask = readReg16(MCP23x17_PUR_A);
|
|
if (_error != MCP23S17_OK)
|
|
{
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////
|
|
//
|
|
// INTERRUPTS (experimental, see MCP23S17 - #40)
|
|
//
|
|
// TODO, catch writeReg errors
|
|
// TODO, MCP23x17_INT_MODE_ERROR?
|
|
// TODO, if register not changed no need to update?
|
|
// TODO, 8 bits optimize? more code vs speed?
|
|
//
|
|
// pin = 0..15, mode = { RISING, FALLING, CHANGE }
|
|
bool MCP23S17::enableInterrupt(uint8_t pin, uint8_t mode)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
|
|
// right mode
|
|
uint16_t intcon = readReg16(MCP23x17_INTCON_A);
|
|
if (mode == CHANGE)
|
|
{
|
|
// compare to previous value.
|
|
intcon &= ~(1 << pin);
|
|
}
|
|
else
|
|
{
|
|
uint16_t defval = readReg16(MCP23x17_DEFVAL_A);
|
|
if (mode == RISING)
|
|
{
|
|
intcon |= (1 << pin);
|
|
defval &= ~(1 << pin); // RISING == compare to 0
|
|
}
|
|
else if (mode == FALLING)
|
|
{
|
|
intcon |= (1 << pin);
|
|
defval |= ~(1 << pin); // FALLING == compare to 1
|
|
}
|
|
writeReg16(MCP23x17_DEFVAL_A, defval);
|
|
}
|
|
writeReg16(MCP23x17_INTCON_A, intcon);
|
|
|
|
// enable interrupt
|
|
uint16_t value = readReg16(MCP23x17_GPINTEN_A);
|
|
value |= (1 << pin);
|
|
return writeReg16(MCP23x17_GPINTEN_A, value);
|
|
}
|
|
|
|
|
|
bool MCP23S17::disableInterrupt(uint8_t pin)
|
|
{
|
|
if (pin > 15)
|
|
{
|
|
_error = MCP23S17_PIN_ERROR;
|
|
return false;
|
|
}
|
|
// disable interrupt
|
|
uint16_t value = readReg16(MCP23x17_GPINTEN_A);
|
|
value &= ~(1 << pin);
|
|
return writeReg16(MCP23x17_GPINTEN_A, value);
|
|
}
|
|
|
|
|
|
bool MCP23S17::enableInterrupt16(uint16_t mask, uint8_t mode)
|
|
{
|
|
uint16_t intcon = 0, defval = 0;
|
|
// right mode
|
|
if (mode == CHANGE)
|
|
{
|
|
// compare to previous value.
|
|
intcon = ~mask;
|
|
}
|
|
else
|
|
{
|
|
if (mode == RISING)
|
|
{
|
|
intcon = mask;
|
|
defval = ~mask; // RISING == compare to 0
|
|
}
|
|
else if (mode == FALLING)
|
|
{
|
|
intcon = mask;
|
|
defval = mask; // FALLING == compare to 1
|
|
}
|
|
writeReg16(MCP23x17_DEFVAL_A, defval);
|
|
}
|
|
writeReg16(MCP23x17_INTCON_A, intcon);
|
|
|
|
// enable the mask
|
|
writeReg16(MCP23x17_GPINTEN_A, mask);
|
|
return true;
|
|
}
|
|
|
|
|
|
bool MCP23S17::disableInterrupt16(uint16_t mask)
|
|
{
|
|
return writeReg16(MCP23x17_GPINTEN_A, ~mask);
|
|
}
|
|
|
|
|
|
// which pins caused the INT?
|
|
uint16_t MCP23S17::getInterruptFlagRegister()
|
|
{
|
|
return readReg16(MCP23x17_INTF_A);
|
|
}
|
|
|
|
|
|
uint16_t MCP23S17::getInterruptCaptureRegister()
|
|
{
|
|
return readReg16(MCP23x17_INTCAP_A);
|
|
}
|
|
|
|
// polarity: 0 = LOW, 1 = HIGH, 2 = NONE/ODR
|
|
bool MCP23S17::setInterruptPolarity(uint8_t polarity)
|
|
{
|
|
if (polarity > 2) return false;
|
|
uint8_t reg = readReg(MCP23x17_IOCR);
|
|
reg &= ~(MCP23x17_IOCR_ODR | MCP23x17_IOCR_INTPOL);
|
|
// LOW is default set.
|
|
if (polarity == 2) reg |= MCP23x17_IOCR_ODR;
|
|
if (polarity == 1) reg |= MCP23x17_IOCR_INTPOL;
|
|
return writeReg(MCP23x17_IOCR, reg);
|
|
}
|
|
|
|
|
|
uint8_t MCP23S17::getInterruptPolarity()
|
|
{
|
|
uint8_t reg = readReg(MCP23x17_IOCR);
|
|
if (reg & MCP23x17_IOCR_ODR) return 2;
|
|
if (reg & MCP23x17_IOCR_INTPOL) return 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
bool MCP23S17::mirrorInterrupts(bool on)
|
|
{
|
|
if (on) return enableControlRegister(MCP23x17_IOCR_MIRROR);
|
|
return disableControlRegister(MCP23x17_IOCR_MIRROR);
|
|
}
|
|
|
|
|
|
bool MCP23S17::isMirroredInterrupts()
|
|
{
|
|
return (readReg(MCP23x17_IOCR) & MCP23x17_IOCR_MIRROR) > 0;
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////
|
|
//
|
|
// MISC
|
|
//
|
|
int MCP23S17::lastError()
|
|
{
|
|
int e = _error;
|
|
_error = MCP23S17_OK; // reset error after read.
|
|
return e;
|
|
}
|
|
|
|
|
|
bool MCP23S17::enableControlRegister(uint8_t mask)
|
|
{
|
|
uint8_t reg = readReg(MCP23x17_IOCR);
|
|
reg |= mask;
|
|
return writeReg(MCP23x17_IOCR, reg);
|
|
}
|
|
|
|
|
|
bool MCP23S17::disableControlRegister(uint8_t mask)
|
|
{
|
|
uint8_t reg = readReg(MCP23x17_IOCR);
|
|
reg &= ~mask;
|
|
return writeReg(MCP23x17_IOCR, reg);
|
|
}
|
|
|
|
|
|
bool MCP23S17::enableHardwareAddress()
|
|
{
|
|
return enableControlRegister(MCP23x17_IOCR_HAEN);
|
|
}
|
|
|
|
|
|
bool MCP23S17::disableHardwareAddress()
|
|
{
|
|
return disableControlRegister(MCP23x17_IOCR_HAEN);
|
|
}
|
|
|
|
|
|
////////////////////////////////////////////////////
|
|
//
|
|
// PROTECTED
|
|
//
|
|
|
|
|
|
// low level read / write masks
|
|
#define MCP23S17_WRITE_REG 0x40
|
|
#define MCP23S17_READ_REG 0x41
|
|
|
|
|
|
bool MCP23S17::writeReg(uint8_t reg, uint8_t value)
|
|
{
|
|
_error = MCP23S17_OK;
|
|
|
|
if (reg > MCP23x17_OLAT_B)
|
|
{
|
|
_error = MCP23S17_REGISTER_ERROR;
|
|
return false;
|
|
}
|
|
|
|
// start write
|
|
::digitalWrite(_select, LOW);
|
|
if (_hwSPI)
|
|
{
|
|
_mySPI->beginTransaction(_spi_settings);
|
|
// _address already shifted
|
|
_mySPI->transfer(MCP23S17_WRITE_REG | _address );
|
|
_mySPI->transfer(reg);
|
|
_mySPI->transfer(value);
|
|
_mySPI->endTransaction();
|
|
}
|
|
else
|
|
{
|
|
// _address already shifted
|
|
swSPI_transfer(MCP23S17_WRITE_REG | _address );
|
|
swSPI_transfer(reg);
|
|
swSPI_transfer(value);
|
|
}
|
|
::digitalWrite(_select, HIGH);
|
|
return true;
|
|
}
|
|
|
|
|
|
uint8_t MCP23S17::readReg(uint8_t reg)
|
|
{
|
|
uint8_t rv = 0;
|
|
|
|
_error = MCP23S17_OK;
|
|
|
|
if (reg > MCP23x17_OLAT_B)
|
|
{
|
|
_error = MCP23S17_REGISTER_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
// start read
|
|
::digitalWrite(_select, LOW);
|
|
if (_hwSPI)
|
|
{
|
|
_mySPI->beginTransaction(_spi_settings);
|
|
// _address already shifted
|
|
_mySPI->transfer(MCP23S17_READ_REG | _address );
|
|
_mySPI->transfer(reg);
|
|
rv = _mySPI->transfer(0xFF);
|
|
_mySPI->endTransaction();
|
|
}
|
|
else
|
|
{
|
|
// _address already shifted
|
|
swSPI_transfer(MCP23S17_READ_REG | _address );
|
|
swSPI_transfer(reg);
|
|
rv = swSPI_transfer(0xFF);
|
|
}
|
|
::digitalWrite(_select, HIGH);
|
|
return rv;
|
|
}
|
|
|
|
|
|
// writes HIGH byte first, LOW byte last
|
|
bool MCP23S17::writeReg16(uint8_t reg, uint16_t value)
|
|
{
|
|
_error = MCP23S17_OK;
|
|
|
|
if (reg > MCP23x17_OLAT_B)
|
|
{
|
|
_error = MCP23S17_REGISTER_ERROR;
|
|
return false;
|
|
}
|
|
|
|
// start write
|
|
::digitalWrite(_select, LOW);
|
|
if (_hwSPI)
|
|
{
|
|
_mySPI->beginTransaction(_spi_settings);
|
|
// _address already shifted
|
|
_mySPI->transfer(MCP23S17_WRITE_REG | _address );
|
|
_mySPI->transfer(reg);
|
|
_mySPI->transfer(value >> 8);
|
|
_mySPI->transfer(value & 0xFF);
|
|
_mySPI->endTransaction();
|
|
}
|
|
else
|
|
{
|
|
// _address already shifted
|
|
swSPI_transfer(MCP23S17_WRITE_REG | _address );
|
|
swSPI_transfer(reg);
|
|
swSPI_transfer(value >> 8);
|
|
swSPI_transfer(value & 0xFF);
|
|
}
|
|
::digitalWrite(_select, HIGH);
|
|
return true;
|
|
}
|
|
|
|
|
|
uint16_t MCP23S17::readReg16(uint8_t reg)
|
|
{
|
|
uint16_t rv = 0;
|
|
|
|
_error = MCP23S17_OK;
|
|
|
|
if (reg > MCP23x17_OLAT_B)
|
|
{
|
|
_error = MCP23S17_REGISTER_ERROR;
|
|
return 0;
|
|
}
|
|
|
|
// start read
|
|
::digitalWrite(_select, LOW);
|
|
if (_hwSPI)
|
|
{
|
|
_mySPI->beginTransaction(_spi_settings);
|
|
// _address already shifted
|
|
_mySPI->transfer(MCP23S17_READ_REG | _address );
|
|
_mySPI->transfer(reg);
|
|
rv = _mySPI->transfer(0xFF) << 8;
|
|
rv += _mySPI->transfer(0xFF);
|
|
_mySPI->endTransaction();
|
|
}
|
|
else
|
|
{
|
|
// _address already shifted
|
|
swSPI_transfer(MCP23S17_READ_REG | _address );
|
|
swSPI_transfer(reg);
|
|
rv = swSPI_transfer(0xFF) << 8;
|
|
rv += swSPI_transfer(0xFF);
|
|
}
|
|
::digitalWrite(_select, HIGH);
|
|
return rv;
|
|
}
|
|
|
|
|
|
uint8_t MCP23S17::swSPI_transfer(uint8_t val)
|
|
{
|
|
uint8_t clk = _clock;
|
|
uint8_t dao = _dataOut;
|
|
uint8_t dai = _dataIn;
|
|
|
|
uint8_t rv = 0;
|
|
for (uint8_t mask = 0x80; mask > 0; mask >>= 1)
|
|
{
|
|
::digitalWrite(dao, (val & mask) ? HIGH : LOW);
|
|
::digitalWrite(clk, HIGH);
|
|
if (::digitalRead(dai) == HIGH) rv |= mask;
|
|
::digitalWrite(clk, LOW);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
|
|
// -- END OF FILE --
|
|
|