74HC40520.hpp

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#include <Arduino.h>
 
class MUX_74HC40520{
public:
    MUX_74HC40520(void){}
 
    void setPins(int mux_inh, int mux_a, int mux_b){
        this->mux_inh = mux_inh;
        this->mux_a = mux_a;
        this->mux_b = mux_b;
 
        pinMode(mux_inh, OUTPUT);
        digitalWrite(mux_inh, LOW);
 
        pinMode(mux_a, OUTPUT);
        digitalWrite(mux_a, LOW);
 
        pinMode(mux_b, OUTPUT);
        digitalWrite(mux_b, LOW);
    }
 
    void select(int channel){
 
        if(channel >= 4 || channel < 0){
            if(Serial && DEBUG){
                Serial.println("ERROR: channel is invalid, use one 0-3");
            }
            return;
        }
 
        switch(channel){
            case 0: // X0, Y0
                digitalWrite(this->mux_inh, LOW);
                digitalWrite(this->mux_a, LOW);
                digitalWrite(this->mux_b, LOW);
                break;
            case 1: // X1, Y1
                digitalWrite(mux_inh, LOW);
                digitalWrite(mux_a, HIGH);
                digitalWrite(mux_b, LOW);
                break;
            case 2: // X2, Y2
                digitalWrite(mux_inh, LOW);
                digitalWrite(mux_a, LOW);
                digitalWrite(mux_b, HIGH);
                break;
            case 3: // X3, Y3
                digitalWrite(mux_inh, LOW);
                digitalWrite(mux_a, HIGH);
                digitalWrite(mux_b, HIGH);
                break;
 
            default: // turn X and Y off
                digitalWrite(mux_inh, HIGH);
                if(Serial){
                    Serial.println("ERROR: invalid MUX channel chosen");
                }
        }
    }
 
    int readChannel(int pin){
        return analogRead(pin);
    }
 
    void writeChannel(int pin, int value){
        digitalWrite(pin, value);
    }
 
    enum Mux_Channel {
        X, 
        Y  
    };
 
private:
    uint8_t mux_inh, mux_a, mux_b;
};