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https://github.com/RobTillaart/Arduino.git
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75 lines
1.2 KiB
C++
75 lines
1.2 KiB
C++
//
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// FILE: PCF8575_interrupt.ino
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// AUTHOR: Rob Tillaart
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// DATE: 2021-01-03
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// PURPOSE: test PCF8575 library
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// URL: https://github.com/RobTillaart/PCF8575
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//
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// TEST SETUP
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// Connect INT pin of the PCF8575 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 10-400 pF between pin and GND
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#include "PCF8575.h"
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PCF8575 PCF(0x20);
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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("PCF8575_LIB_VERSION:\t");
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Serial.println(PCF8575_LIB_VERSION);
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Wire.begin();
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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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uint16_t x = PCF.read16();
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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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