84 lines
2.8 KiB
C++
84 lines
2.8 KiB
C++
#include <FlowMeter.h>
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#include <Wire.h>
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#include <Adafruit_MCP23017.h>
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Adafruit_MCP23017 mcp;
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byte ledPin=13;
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byte InteruptPinA=1;
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byte InteruptPinB=3;
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byte arduinoInterrupt=1;
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FlowMeter sensorA[6]= FlowMeter(1);
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FlowMeter sensorB[6]= FlowMeter(3);
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volatile boolean awakenByInterrupt = false;
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// Two pins at the MCP (Ports A/B where some buttons have been setup.)
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// Buttons connect the pin to grond, and pins are pulled up.
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byte mcpPinA=7;
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byte mcpPinB=15;
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void setup(){
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pinMode(1, FUNCTION_3);
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pinMode(3, FUNCTION_3);
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pinMode(1,INPUT);
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pinMode(3,INPUT);
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mcp.begin(); // use default address 0
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mcp.setupInterrupts(true,false,LOW);
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// configuration for a button on port A
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mcp.pinMode(mcpPinA, INPUT);
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// mcp.pullUp(mcpPinA, HIGH); // turn on a 100K pullup internally
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mcp.setupInterruptPin(mcpPinA,RISING);
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mcp.pinMode(mcpPinB, INPUT);
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// mcp.pullUp(mcpPinB, HIGH); // turn on a 100K pullup internall
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mcp.setupInterruptPin(mcpPinB,RISING);
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// We will setup a pin for flashing from the int routine
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pinMode(ledPin, OUTPUT);
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}
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// The int handler will just signal that the int has happen
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// we will do the work from the main loop.
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void intCallBack(){
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awakenByInterrupt=true;
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}
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void handleInterrupt(){
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// Get more information from the MCP from the INT
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uint8_t pin=mcp.getLastInterruptPin();
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uint8_t val=mcp.getLastInterruptPinValue();
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// We will flash the led 1 or 2 times depending on the PIN that triggered the Interrupt
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// 3 and 4 flases are supposed to be impossible conditions... just for debugging.
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for(int sid=0;sid<=5;sid++)sensorA[sid].count();
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for(int sid=6;sid<11;sid++)sensorA[sid-6].count();
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// we have to wait for the interrupt condition to finish
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// otherwise we might go to sleep with an ongoing condition and never wake up again.
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// as, an action is required to clear the INT flag, and allow it to trigger again.
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// see datasheet for datails.
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while( ! (mcp.digitalRead(mcpPinB) && mcp.digitalRead(mcpPinA) ));
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// and clean queued INT signal
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cleanInterrupts();
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}
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// handy for interrupts triggered by buttons
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// normally signal a few due to bouncing issues
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void cleanInterrupts(){
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//EIFR=0x01;
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awakenByInterrupt=false;
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}
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/**
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* main routine: sleep the arduino, and wake up on Interrups.
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* the LowPower library, or similar is required for sleeping, but sleep is simulated here.
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* It is actually posible to get the MCP to draw only 1uA while in standby as the datasheet claims,
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* however there is no stadndby mode. Its all down to seting up each pin in a way that current does not flow.
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* and you can wait for interrupts while waiting.
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*/
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void loop(){
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attachInterrupt(arduinoInterrupt,intCallBack,FALLING);
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while(!awakenByInterrupt);
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// disable interrupts while handling them.
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detachInterrupt(arduinoInterrupt);
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if(awakenByInterrupt) handleInterrupt();
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}
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