main.cpp

00001 #include "mbed.h"
00002 #include "SLCD.h"
00003 
00004 
00005 // An State Machine solution to HW 4.1 Q3
00006 // using wait() for high and low limits.
00007 //#define PRINTDEBUG
00008 #define PROGNAME "blink_kl46z_states nowait v1\n\r"
00009 #define LEDON false
00010 #define LEDOFF true
00011 #define LEDTMESS "TRUE"
00012 #define LEDFMESS "FALS"
00013 #define BLINKDWELL 400 // milliseconds
00014 #define LIMITSTAYON 1000
00015 #define DFDELTA 0.01
00016 #define PWMTIME 1 // ms (kHz
00017 #define LCDLEN 10
00018 #define NUMSTATES 2
00019 #define LOWLIMIT 0.1
00020 #define HILIMIT 0.85
00021 #define ONTIME 1.0
00022 
00023 
00024 enum blinkStates {IDLESTATE, NEWBLINK, LOWLITE, HILITE}; // define the states
00025 
00026 char logicalString [NUMSTATES][LCDLEN] = {LEDFMESS, LEDTMESS};
00027 SLCD slcd; //define LCD display globally define
00028 Serial pc(USBTX, USBRX);
00029 
00030 void LCDMess(char *lMess){
00031         slcd.Home();
00032         slcd.clear();
00033         slcd.printf(lMess);
00034 } 
00035 
00036 int main() {
00037     DigitalOut greenColor(LED_GREEN);
00038     DigitalOut redColor(LED_RED);
00039     AnalogIn LightSensor(PTE22);
00040     float lightData; 
00041     char lcdData[LCDLEN];
00042     Timer LEDTimer;  // time till next PWM values is to change.
00043     blinkStates PGMState = IDLESTATE; // work till timer transitions
00044     int ledState = LEDON;  
00045     
00046    
00047     int timeToChangeDF = BLINKDWELL;
00048     // set up timer for next step of Duty Factor timing
00049     LEDTimer.start();
00050     LEDTimer.reset();
00051     pc.printf(PROGNAME);
00052     
00053     
00054 
00055     while(true) {
00056         switch (PGMState){ 
00057             case IDLESTATE: {
00058                 if (LEDTimer.read_ms() > timeToChangeDF){ // check for timer time out transtion
00059                     lightData = (1.0 - LightSensor.read());
00060                     sprintf(lcdData,"%4.3f",lightData);
00061                     LCDMess(lcdData);  
00062                     timeToChangeDF = BLINKDWELL;
00063                     if (lightData < LOWLIMIT){ // find appropriate state
00064                         PGMState = LOWLITE;
00065                         timeToChangeDF = LIMITSTAYON;
00066                     } else if (lightData > HILIMIT){
00067                         PGMState = HILITE;
00068                         timeToChangeDF = LIMITSTAYON;
00069                     } else {
00070                         PGMState = NEWBLINK;
00071                         timeToChangeDF = BLINKDWELL;
00072                     }                      
00073                     
00074                 }
00075                 break;
00076               }
00077              case  NEWBLINK: {              
00078                 ledState = !ledState;
00079                 redColor.write(ledState);
00080                 greenColor.write(!ledState);
00081                 // create string for display on LCD
00082                              
00083                 LEDTimer.reset();  // reset the timer
00084                 PGMState = IDLESTATE;  // go idle state
00085                 break;
00086               }
00087              case HILITE: {              
00088                 redColor.write(LEDON);
00089                 greenColor.write(LEDOFF);
00090                 // create string for display on LCD
00091                 if (LEDTimer.read_ms() > timeToChangeDF){     
00092                     LEDTimer.reset();  // reset the timer
00093                     PGMState = IDLESTATE;  // go idle state
00094                 }
00095                 break;
00096               }
00097              case LOWLITE: {              
00098                 redColor.write(LEDOFF);
00099                 greenColor.write(LEDON);
00100                 // create string for display on LCD
00101                 if (LEDTimer.read_ms() > timeToChangeDF){     
00102                     LEDTimer.reset();  // reset the timer
00103                     PGMState = IDLESTATE;  // go idle state
00104                 }
00105                 break;
00106               }
00107         } // end state machine
00108         
00109 #ifdef PRINTDEBUG
00110         pc.printf("i= %d dutyfactor = %5.4f workingDelta %5.4f \n\r",  i, dutyFactor, workingDelta); 
00111 #endif
00112     }// emd while
00113 }