GY-63_MS5611/libraries/PCF8574/examples/buttonRead8/buttonRead8.ino

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/**
* @file
* @Author Septillion (https://github.com/sseptillion)
* @date 2016-05-20
* @brief Example how to use buttonRead8()
*
* buttonRead8() works the same as buttonRead() but works on all
* pins simultaneous. You can give a mask as parameter to decide which
* pins are affected (aka, made high for a short periode) during
* a buttonRead8().
*
* The mask can also be set with setButtonMask(mask). Calling buttonRead8()
* after that will be the same as calling buttonRead8(mask).
*
* ButtonRead8() can also be used for pins that are input only.
*
* In this example pin 0 of the PCF8574 (address 0x20) is used to blink a
* LED but at the same time it can be used to toggle the onboard LED of
* the Arduino.
*
* Pin 1 is also toggle but isn't affected by the buttonRead8();
*
* NOTE: The button will affect the LED on the same pin. The led will light up
* no matter the set output state when you press the button.
*/
#include <PCF8574.h>
#include <Wire.h>
PCF8574 pcf20(0x20);
const byte onboardLed = 13;
const byte PcfButtonLedPin = 0;
const byte PcfLedPin = 1;
unsigned int blinkMillis;
unsigned int buttonMillis;
void setup() {
Serial.begin(115200);
pcf20.begin();
pinMode(onboardLed, OUTPUT);
//As alternative to adding the mask to buttonRead8() every time
//you can set it once.
//Without setting a mask buttonRead8() will effect ALL pins.
//Not a problem when using things like LEDs.
//pcf20.setButtonMask(_BV(PcfButtonLedPin));
}
void loop() {
static bool state;
unsigned int currentMillis = millis();
//Limit button read to 20 times a second
//Fast enough for most buttons
//but this way you don't have a dimmer output because it's blanked during button read
//a read takes 460us t 16Mhz Arduino and normal I2C speed.
if(currentMillis - buttonMillis >= 50){
buttonMillis = currentMillis;
//read all states but only force PcfButtonLedPin HIGH during the
//buttonRead8()
//Alternativly the mask could have been set with setButtonMask().
//Then the mask can be omitted here. See setup()
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// byte inputStates = pcf20.readButton8(_BV(PcfButtonLedPin));
byte inputStates = pcf20.readButton8(1 << PcfButtonLedPin); // Keep Arduino-CI happy
//check the bit of PcfButtonLedPin
if(state != bitRead(inputStates, PcfButtonLedPin)){
if(state){
//toggle the LED
digitalWrite(onboardLed, !digitalRead(onboardLed));
}
state = !state;
}
}
//Lets blink the same output
if(currentMillis - blinkMillis >= 500){
//Update time
blinkMillis = currentMillis;
pcf20.toggle(PcfButtonLedPin);
pcf20.toggle(PcfLedPin);
Serial.println(pcf20.read8(), BIN);
}
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}