main.cpp

00001 //    touch2RGB
00002 //program for FRDM-KL25Z
00003 //each touch on the touch sensor switches embedded led between Red Green and Blue colours
00004 
00005 #include "mbed.h"
00006 #include "TSISensor.h"
00007 
00008 const float TOUCH_THRESHOLD=0.5;   //sensor returns analog value from 0.0(no touch) to 1.0(full touch) to determine when there is a touch
00009 enum  colour { RED=0,GREEN,BLUE};
00010 
00011 bool analog2dig(float );
00012 void setColour(colour);
00013 
00014 DigitalOut r (LED_RED);
00015 DigitalOut g (LED_GREEN);
00016 DigitalOut b (LED_BLUE);
00017 colour currentColour=RED;
00018 
00019 Serial pc(USBTX,USBRX); //serial connection with pc
00020 TSISensor tsi; //touchSensor
00021 
00022 
00023 
00024 int main() {
00025      bool previousState=analog2dig(tsi.readPercentage());
00026      bool currentState;
00027      
00028      setColour(currentColour); //set initial colour
00029      pc.printf("begin - initial state=%d\n",previousState);
00030      
00031      while(1){
00032         currentState=analog2dig(tsi.readPercentage());
00033         //pc.printf("state=%d\n",currentState);  
00034         if(previousState==false && currentState==true){  //touch detected
00035             switch (currentColour){
00036                 case RED:
00037                     setColour(GREEN);
00038                     break;
00039                 case GREEN:
00040                     setColour(BLUE);
00041                     break;
00042                 case BLUE:
00043                     setColour(RED);
00044                     break;
00045                 };//end switch
00046         }//end if
00047         previousState=currentState;
00048         wait(0.1);
00049  }
00050 }
00051 
00052 //---------------------------------------------
00053 void setColour(colour col){
00054     switch(col){
00055         case RED:
00056             r=0;  // 0 enables the led
00057             g=1;  // 1 disables the led
00058             b=1;
00059             currentColour=RED;        
00060             break;
00061         case GREEN:
00062             r=1;
00063             g=0;
00064             b=1;
00065             currentColour=GREEN;
00066             break;
00067         case BLUE:
00068             r=1;
00069             g=1;
00070             b=0;
00071             currentColour=BLUE;
00072             break;
00073     }
00074     return;
00075 } 
00076 
00077 
00078 //-----------------------------------------------
00079 bool analog2dig(float analogRead){
00080     return (analogRead>=TOUCH_THRESHOLD)?true:false;
00081 
00082     }