mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-09-20 00:55:58 -04:00
74 lines
1.2 KiB
C++
74 lines
1.2 KiB
C++
//
|
|
// FILE: PCF8575_interrupt.ino
|
|
// AUTHOR: Rob Tillaart
|
|
// PURPOSE: test PCF8575 library
|
|
// URL: https://github.com/RobTillaart/PCF8575
|
|
//
|
|
// TEST SETUP
|
|
// Connect INT pin of the PCF8575 to UNO pin 2
|
|
//
|
|
// (from figure 4 datasheet
|
|
// Place a pull up resistor 4K7 between pin and 5V
|
|
// Place a capacitor 10-400 pF between pin and GND
|
|
|
|
|
|
#include "PCF8575.h"
|
|
|
|
PCF8575 PCF(0x20);
|
|
|
|
|
|
////////////////////////////////////
|
|
//
|
|
// INTERRUPT ROUTINE + FLAG
|
|
//
|
|
const int IRQPIN = 2;
|
|
|
|
volatile bool flag = false;
|
|
|
|
void pcf_irq()
|
|
{
|
|
flag = true;
|
|
}
|
|
|
|
|
|
////////////////////////////////////
|
|
//
|
|
// MAIN CODE
|
|
//
|
|
void setup()
|
|
{
|
|
Serial.begin(115200);
|
|
Serial.println(__FILE__);
|
|
Serial.print("PCF8575_LIB_VERSION:\t");
|
|
Serial.println(PCF8575_LIB_VERSION);
|
|
|
|
Wire.begin();
|
|
|
|
PCF.begin();
|
|
|
|
pinMode(IRQPIN, INPUT_PULLUP);
|
|
attachInterrupt(digitalPinToInterrupt(IRQPIN), pcf_irq, FALLING);
|
|
}
|
|
|
|
|
|
void loop()
|
|
{
|
|
uint32_t now = millis();
|
|
if (flag)
|
|
{
|
|
flag = false;
|
|
uint16_t x = PCF.read16();
|
|
Serial.print("READ:\t");
|
|
Serial.print('\t');
|
|
Serial.print(now);
|
|
Serial.print('\t');
|
|
Serial.println(x, HEX);
|
|
}
|
|
// do other things here
|
|
delay(10);
|
|
}
|
|
|
|
|
|
// -- END OF FILE --
|
|
|