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72 lines
1.1 KiB
C++
72 lines
1.1 KiB
C++
//
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// FILE: PCF8574_interrupt.ino
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// AUTHOR: Rob Tillaart
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// DATE: 2020-12-07
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// PUPROSE: test PCF8574 library
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//
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// TEST SETUP
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// Connect INT pin of the PCF8574 to UNO pin 2
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//
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// (from figure 4 datasheet
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// Place a pull up resistor 4K7 between pin and 5V
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// Place a capacitor 10-400pF between pin and GND
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#include "PCF8574.h"
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PCF8574 PCF(0x38);
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////////////////////////////////////
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//
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// INTERRUPT ROUTINE + FLAG
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//
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const int IRQPIN = 2;
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volatile bool flag = false;
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void pcf_irq()
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{
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flag = true;
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}
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////////////////////////////////////
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//
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// MAIN CODE
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//
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void setup()
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{
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Serial.begin(115200);
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Serial.println(__FILE__);
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Serial.print("PCF8574_LIB_VERSION: ");
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Serial.println(PCF8574_LIB_VERSION);
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PCF.begin();
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pinMode(IRQPIN, INPUT_PULLUP);
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attachInterrupt(digitalPinToInterrupt(IRQPIN), pcf_irq, FALLING);
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}
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void loop()
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{
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uint32_t now = millis();
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if (flag)
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{
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flag = false;
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int x = PCF.read8();
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Serial.print("READ:\t");
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Serial.print('\t');
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Serial.print(now);
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Serial.print('\t');
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Serial.println(x, HEX);
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}
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// do other things here
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delay(10);
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}
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// -- END OF FILE --
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