77 lines
1.7 KiB
C++
77 lines
1.7 KiB
C++
#include "Arduino.h"
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#include "INPUT_74HC4051.h"
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//should be called in setup()
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void INPUT_74HC4051::begin(uint8_t analog, uint8_t s0, uint8_t s1, uint8_t s2,CallbackFunction cbF) {
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//analog pin which output Z is connected to
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_analog = analog;
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//3 digital pins where S0,S1,S2 are connected to
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_s0 = s0;
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_s1 = s1;
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_s2 = s2;
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pinMode(_analog,INPUT);
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pinMode(_s0,OUTPUT);
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pinMode(_s1,OUTPUT);
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pinMode(_s2,OUTPUT);
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_callbackFunction = cbF;
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//initalize start values
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uint8_t pin,r0,r1,r2;
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//run through the 8 I/O pins
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for (pin=0; pin<8; pin++) {
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r0 = bitRead(pin,0);
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r1 = bitRead(pin,1);
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r2 = bitRead(pin,2);
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digitalWrite(_s0, r0);
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digitalWrite(_s1, r1);
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digitalWrite(_s2, r2);
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//delayMicroseconds(10);
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_value[pin] = analogRead(_analog);
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}
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}
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//should be called in loop(), read values and call callback function on change
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void INPUT_74HC4051::loop() {
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uint8_t pin,r0,r1,r2;
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int value;
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for (pin=0; pin<8; pin++) {
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r0 = bitRead(pin,0);
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r1 = bitRead(pin,1);
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r2 = bitRead(pin,2);
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digitalWrite(_s0, r0);
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digitalWrite(_s1, r1);
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digitalWrite(_s2, r2);
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//not sure if nessesary
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//delayMicroseconds(10);
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value = analogRead(_analog);
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if (_value[pin] < value - INPUT_74HC4051_TOLERANCE || _value[pin] > value + INPUT_74HC4051_TOLERANCE) {
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_value[pin] = value;
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(*_callbackFunction)(_analog,pin,value);
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}
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}
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}
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//maybe useful later
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int INPUT_74HC4051::getSpecificValue(uint8_t pin) {
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if (pin >= 8)
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return -1;
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uint8_t r0,r1,r2;
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r0 = bitRead(pin,0);
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r1 = bitRead(pin,1);
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r2 = bitRead(pin,2);
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digitalWrite(_s0, r0);
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digitalWrite(_s1, r1);
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digitalWrite(_s2, r2);
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//delayMicroseconds(10);
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int value = analogRead(_analog);
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_value[pin] = value;
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return value;
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}
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