Revision 0:7f158d69af5e, committed 2018-01-20

Comitter:

scottohair

Date:

Sat Jan 20 10:52:09 2018 +0000

Commit message:

Library for the CDHC4067. Tested on NUCLEO-F401RE.

Changed in this revision

diff -r 000000000000 -r 7f158d69af5e CD74HC4067.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CD74HC4067.cpp	Sat Jan 20 10:52:09 2018 +0000
@@ -0,0 +1,61 @@
+//CD74HC4067 Library based on bildr code: "http://bildr.org/2011/02/cd74hc4067-arduino/"
+//Ported to mbed by Scott M. O'Hair
+
+#include "CD74HC4067.h"
+#include "mbed.h"
+
+
+CD74HC4067::CD74HC4067(PinName S1, PinName S2, PinName S3, PinName S4, PinName SIG) : _S0(S1), _S1(S2), _S2(S3), _S3(S4), _SIG(SIG)
+{
+    //initialize port state to zero
+    for (uint8_t i = 0; i < 15; i++) {
+        portState[i] = 0.0;
+    }
+
+    //pull all pins low
+    _S0 = 0;
+    _S1 = 0;
+    _S2 = 0;
+    _S3 = 0;
+
+}
+
+void CD74HC4067::saveState(uint8_t port, float state)
+{
+    this->portState[port] = state;
+}
+
+float CD74HC4067::readMux(uint8_t channel)
+{
+    DigitalOut controlPin[] = {_S0, _S1, _S2, _S3};
+
+    uint8_t muxChannel[16][4]= {
+        {0,0,0,0}, //channel 0
+        {1,0,0,0}, //channel 1
+        {0,1,0,0}, //channel 2
+        {1,1,0,0}, //channel 3
+        {0,0,1,0}, //channel 4
+        {1,0,1,0}, //channel 5
+        {0,1,1,0}, //channel 6
+        {1,1,1,0}, //channel 7
+        {0,0,0,1}, //channel 8
+        {1,0,0,1}, //channel 9
+        {0,1,0,1}, //channel 10
+        {1,1,0,1}, //channel 11
+        {0,0,1,1}, //channel 12
+        {1,0,1,1}, //channel 13
+        {0,1,1,1}, //channel 14
+        {1,1,1,1}  //channel 15
+    };
+
+    //loop through the 4 sig
+    for(uint8_t i = 0; i < 4; i++) {
+        controlPin[i] =  muxChannel[channel][i];
+    }
+
+    //read the value at the SIG pin
+    float val = _SIG.read();
+
+    //return the value
+    return val;
+}

diff -r 000000000000 -r 7f158d69af5e CD74HC4067.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CD74HC4067.h	Sat Jan 20 10:52:09 2018 +0000
@@ -0,0 +1,56 @@
+//CD74HC4067 Library based on bildr code: "http://bildr.org/2011/02/cd74hc4067-arduino/"
+//Ported to mbed by Scott M. O'Hair
+//
+//sample code:
+/*
+#include "mbed.h"
+#include "CD74HC4067.h"
+
+Serial pc(PB_6, PA_10, 115200); //tx, rx 
+
+CD74HC4067 mux1(D8, D9, D12, D11, A0); //S0, S1, S2, S3, SIG
+ 
+int main()
+{
+    pc.printf("Running MUX test\n");
+    while(1) {
+        //Loop through and read all 16 values
+        for(int i = 0; i < 15; i++) {    
+            mux1.currentState = mux1.readMux(i);
+            if (fabs(mux1.portState[i] - mux1.currentState) > BTN_NOISE_THRES) { 
+                pc.printf("Value at channel %i is %f\n", i, mux1.currentState);
+                mux1.saveState(i, mux1.currentState);
+            }
+        }
+
+    }
+}
+*/
+
+
+
+#ifndef MBED_CD74HC4067_H
+#define MBED_CD74HC4067_H
+ 
+#include "mbed.h"
+ 
+#define BTN_NOISE_THRES   0.018f            //Define a threshold for the amount of analog change required
+
+class CD74HC4067 {
+public:
+    CD74HC4067(PinName S1, PinName S2, PinName S3, PinName S4, PinName SIG);
+    void saveState(uint8_t port, float state);
+    float readMux(uint8_t channel);
+    float currentState ;
+    float portState[16];
+  
+private:  
+    DigitalOut _S0;
+    DigitalOut _S1;
+    DigitalOut _S2;
+    DigitalOut _S3;
+    AnalogIn _SIG;    
+
+};
+ 
+#endif
\ No newline at end of file