2016-05-20 08:33:42 -04:00
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/**
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* @file
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* @Author Septillion (https://github.com/sseptillion)
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* @date 2016-05-20
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* @brief Example how to use buttonRead8()
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*
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* buttonRead8() works the same as buttonRead() but works on all
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* pins simultaneous. You can give a mask as parameter to decide which
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* pins are affected (aka, made high for a short periode) during
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* a buttonRead8().
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*
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* The mask can also be set with setButtonMask(mask). Calling buttonRead8()
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* after that will be the same as calling buttonRead8(mask).
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*
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* ButtonRead8() can also be used for pins that are input only.
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*
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* In this example pin 0 of the PCF8574 (address 0x20) is used to blink a
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* LED but at the same time it can be used to toggle the onboard LED of
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* the Arduino.
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*
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* Pin 1 is also toggle but isn't affected by the buttonRead8();
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*
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* NOTE: The button will affect the LED on the same pin. The led will light up
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* no matter the set output state when you press the button.
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*/
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#include <PCF8574.h>
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#include <Wire.h>
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PCF8574 pcf20(0x20);
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const byte onboardLed = 13;
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const byte PcfButtonLedPin = 0;
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const byte PcfLedPin = 1;
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unsigned int blinkMillis;
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unsigned int buttonMillis;
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void setup() {
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Serial.begin(115200);
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pcf20.begin();
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pinMode(onboardLed, OUTPUT);
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//As alternative to adding the mask to buttonRead8() every time
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//you can set it once.
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//Without setting a mask buttonRead8() will effect ALL pins.
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//Not a problem when using things like LEDs.
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//pcf20.setButtonMask(_BV(PcfButtonLedPin));
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}
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void loop() {
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static bool state;
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unsigned int currentMillis = millis();
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//Limit button read to 20 times a second
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//Fast enough for most buttons
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//but this way you don't have a dimmer output because it's blanked during button read
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//a read takes 460us t 16Mhz Arduino and normal I2C speed.
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if(currentMillis - buttonMillis >= 50){
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buttonMillis = currentMillis;
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//read all states but only force PcfButtonLedPin HIGH during the
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//buttonRead8()
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//Alternativly the mask could have been set with setButtonMask().
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//Then the mask can be omitted here. See setup()
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2021-01-29 06:31:58 -05:00
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// byte inputStates = pcf20.readButton8(_BV(PcfButtonLedPin));
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byte inputStates = pcf20.readButton8(1 << PcfButtonLedPin); // Keep Arduino-CI happy
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2016-05-20 08:33:42 -04:00
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//check the bit of PcfButtonLedPin
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if(state != bitRead(inputStates, PcfButtonLedPin)){
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if(state){
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//toggle the LED
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digitalWrite(onboardLed, !digitalRead(onboardLed));
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}
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state = !state;
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}
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}
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//Lets blink the same output
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if(currentMillis - blinkMillis >= 500){
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//Update time
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blinkMillis = currentMillis;
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pcf20.toggle(PcfButtonLedPin);
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pcf20.toggle(PcfLedPin);
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Serial.println(pcf20.read8(), BIN);
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}
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2021-01-29 06:31:58 -05:00
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}
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