CD74HC4067.h

00001 //CD74HC4067 Library based on bildr code: "http://bildr.org/2011/02/cd74hc4067-arduino/"
00002 //Ported to mbed by Scott M. O'Hair
00003 //
00004 //sample code:
00005 /*
00006 #include "mbed.h"
00007 #include "CD74HC4067.h"
00008 
00009 Serial pc(PB_6, PA_10, 115200); //tx, rx 
00010 
00011 CD74HC4067 mux1(D8, D9, D12, D11, A0); //S0, S1, S2, S3, SIG
00012  
00013 int main()
00014 {
00015     pc.printf("Running MUX test\n");
00016     while(1) {
00017         //Loop through and read all 16 values
00018         for(int i = 0; i < 15; i++) {    
00019             mux1.currentState = mux1.readMux(i);
00020             if (fabs(mux1.portState[i] - mux1.currentState) > BTN_NOISE_THRES) { 
00021                 pc.printf("Value at channel %i is %f\n", i, mux1.currentState);
00022                 mux1.saveState(i, mux1.currentState);
00023             }
00024         }
00025 
00026     }
00027 }
00028 */
00029 
00030 
00031 
00032 #ifndef MBED_CD74HC4067_H
00033 #define MBED_CD74HC4067_H
00034  
00035 #include "mbed.h"
00036  
00037 #define BTN_NOISE_THRES   0.018f            //Define a threshold for the amount of analog change required
00038 
00039 class CD74HC4067 {
00040 public:
00041     CD74HC4067(PinName S1, PinName S2, PinName S3, PinName S4, PinName SIG);
00042     void saveState(uint8_t port, float state);
00043     float readMux(uint8_t channel);
00044     float currentState ;
00045     float portState[16];
00046   
00047 private:  
00048     DigitalOut _S0;
00049     DigitalOut _S1;
00050     DigitalOut _S2;
00051     DigitalOut _S3;
00052     AnalogIn _SIG;    
00053 
00054 };
00055  
00056 #endif