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王立帮
282
arduino-cli/libraries/PCF8574_Soft/PCF8574_Soft.cpp
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282
arduino-cli/libraries/PCF8574_Soft/PCF8574_Soft.cpp
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/*
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* See header file for details
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*
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* This program is free software: you can redistribute it and/or modify\n
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* it under the terms of the GNU General Public License as published by\n
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* the Free Software Foundation, either version 3 of the License, or\n
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* (at your option) any later version.\n
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*
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* This program is distributed in the hope that it will be useful,\n
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* but WITHOUT ANY WARRANTY; without even the implied warranty of\n
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n
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* GNU General Public License for more details.\n
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*
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* You should have received a copy of the GNU General Public License\n
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* along with this program. If not, see <http://www.gnu.org/licenses/>.\n
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*/
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/* Dependencies */
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#include <SoftwareWire.h>
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#include "PCF8574_Soft.h"
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#ifdef PCF8574_Soft_INTERRUPT_SUPPORT
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#include "PCint.h"
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#endif
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PCF8574_Soft::PCF8574_Soft() :
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_PORT(0), _PIN(0), _DDR(0), _address(0)
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#ifdef PCF8574_Soft_INTERRUPT_SUPPORT
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, _oldPIN(0), _isrIgnore(0), _pcintPin(0), _intMode(), _intCallback()
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#endif
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{
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}
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void PCF8574_Soft::begin(uint8_t address, SoftwareWire *theWire) {
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/* Store the I2C address and init the Wire library */
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_wire = theWire;
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_address = address;
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_wire->begin();
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readGPIO();
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}
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void PCF8574_Soft::pinMode(uint8_t pin, uint8_t mode) {
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/* Switch according mode */
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switch (mode) {
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case INPUT:
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_DDR &= ~(1 << pin);
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_PORT &= ~(1 << pin);
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break;
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case INPUT_PULLUP:
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_DDR &= ~(1 << pin);
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_PORT |= (1 << pin);
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break;
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case OUTPUT:
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_DDR |= (1 << pin);
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_PORT &= ~(1 << pin);
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break;
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default:
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break;
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}
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/* Update GPIO values */
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updateGPIO();
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}
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void PCF8574_Soft::digitalWrite(uint8_t pin, uint8_t value) {
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/* Set PORT bit value */
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if (value)
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_PORT |= (1 << pin);
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else
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_PORT &= ~(1 << pin);
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/* Update GPIO values */
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updateGPIO();
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}
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uint8_t PCF8574_Soft::digitalRead(uint8_t pin) {
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/* Read GPIO */
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readGPIO();
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#ifdef PCF8574_Soft_INTERRUPT_SUPPORT
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/* Check for interrupt (manual detection) */
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//checkForInterrupt();
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#endif
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/* Read and return the pin state */
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return (_PIN & (1 << pin)) ? HIGH : LOW;
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}
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void PCF8574_Soft::write(uint8_t value) {
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/* Store pins values and apply */
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_PORT = value;
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/* Update GPIO values */
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updateGPIO();
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}
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uint8_t PCF8574_Soft::read() {
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/* Read GPIO */
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readGPIO();
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#ifdef PCF8574_Soft_INTERRUPT_SUPPORT
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/* Check for interrupt (manual detection) */
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//checkForInterrupt();
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#endif
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/* Return current pins values */
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return _PIN;
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}
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void PCF8574_Soft::pullUp(uint8_t pin) {
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/* Same as pinMode(INPUT_PULLUP) */
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pinMode(pin, INPUT_PULLUP); // /!\ pinMode form THE LIBRARY
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}
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void PCF8574_Soft::pullDown(uint8_t pin) {
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/* Same as pinMode(INPUT) */
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pinMode(pin, INPUT); // /!\ pinMode form THE LIBRARY
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}
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void PCF8574_Soft::clear() {
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/* User friendly wrapper for write() */
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write(0x00);
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}
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void PCF8574_Soft::set() {
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/* User friendly wrapper for write() */
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write(0xFF);
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}
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void PCF8574_Soft::toggle(uint8_t pin) {
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/* Toggle pin state */
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_PORT ^= (1 << pin);
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/* Update GPIO values */
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updateGPIO();
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}
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void PCF8574_Soft::blink(uint8_t pin, uint16_t count, uint32_t duration) {
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/* Compute steps duration */
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duration /= count * 2;
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/* Loop n times */
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while (count--) {
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/* Toggle pin 2 times */
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toggle(pin);
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delay(duration);
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toggle(pin);
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delay(duration);
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}
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}
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#ifdef PCF8574_Soft_INTERRUPT_SUPPORT
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void PCF8574_Soft::enableInterrupt(uint8_t pin, void (*selfCheckFunction)(void)) {
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/* Store interrupt pin number */
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_pcintPin = pin;
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/* Setup interrupt pin */
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#if ARDUINO >= 100
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::pinMode(pin, INPUT_PULLUP); // /!\ pinMode form THE ARDUINO CORE
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#else
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::pinMode(pin, INPUT); // /!\ pinMode form THE ARDUINO CORE
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::digitalWrite(pin, HIGH); // /!\ digitalWrite form THE ARDUINO CORE
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#endif
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/* Attach interrupt handler */
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PCattachInterrupt(pin, selfCheckFunction, FALLING);
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}
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void PCF8574_Soft::disableInterrupt() {
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/* Detach interrupt handler */
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PCdetachInterrupt(_pcintPin);
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}
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void PCF8574_Soft::checkForInterrupt() {
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/* Avoid nested interrupt triggered by I2C read/write */
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if(_isrIgnore)
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return;
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else
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_isrIgnore = 1;
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/* Re-enable interrupts to allow Wire library to work */
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sei();
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/* Read current pins values */
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readGPIO();
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/* Check all pins */
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for (uint8_t i = 0; i < 8; ++i) {
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/* Check for interrupt handler */
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if (!_intCallback[i])
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continue;
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/* Check for interrupt event */
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switch (_intMode[i]) {
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case CHANGE:
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if ((1 << i) & (_PIN ^ _oldPIN))
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_intCallback[i]();
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break;
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case LOW:
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if (!(_PIN & (1 << i)))
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_intCallback[i]();
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break;
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case FALLING:
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if ((_oldPIN & (1 << i)) && !(_PIN & (1 << i)))
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_intCallback[i]();
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break;
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case RISING:
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if (!(_oldPIN & (1 << i)) && (_PIN & (1 << i)))
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_intCallback[i]();
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break;
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}
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}
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/* Turn off ISR ignore flag */
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_isrIgnore = 0;
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}
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void PCF8574_Soft::attachInterrupt(uint8_t pin, void (*userFunc)(void),
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uint8_t mode) {
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/* Store interrupt mode and callback */
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_intMode[pin] = mode;
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_intCallback[pin] = userFunc;
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}
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void PCF8574_Soft::detachInterrupt(uint8_t pin) {
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/* Void interrupt handler */
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_intCallback[pin] = 0;
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}
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#endif
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void PCF8574_Soft::readGPIO() {
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#ifdef PCF8574_Soft_INTERRUPT_SUPPORT
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/* Store old _PIN value */
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_oldPIN = _PIN;
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#endif
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/* Start request, wait for data and receive GPIO values as byte */
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_wire->requestFrom(_address, (uint8_t) 0x01);
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while (_wire->available() < 1)
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;
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_PIN = _wire->read();
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}
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void PCF8574_Soft::updateGPIO() {
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/* Read current GPIO states */
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//readGPIO(); // Experimental
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/* Compute new GPIO states */
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//uint8_t value = ((_PIN & ~_DDR) & ~(~_DDR & _PORT)) | _PORT; // Experimental
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uint8_t value = (_PIN & ~_DDR) | _PORT;
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/* Start communication and send GPIO values as byte */
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_wire->beginTransmission(_address);
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_wire->write(value);
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_wire->endTransmission();
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}
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