Diff: main.cpp

Revision:

0:c4236b4df489

Child:

1:859677d7ccb4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Oct 09 05:25:09 2016 +0000
@@ -0,0 +1,117 @@
+#include "mbed.h"
+#include <math.h>  
+#include "TSISensor.h"
+#include "SLCD.h"
+
+#define LEDON false
+#define LEDOFF true
+#define NUMBUTS 2
+#define LBUT PTC12  // port addresses for buttons
+#define RBUT PTC3
+#define ARGUMENTSTATE 0
+#define ANSWERSTATE 1
+#define TSILIMIT 0.01
+#define PRINTDELTA 0.1
+#define LCDCHARLEN 10
+#define DATAINTERVAL 0.1
+#define BUTTONTIME 0.1
+#define PROGNAME "kl46z_slider_mid_v1\n\r"
+
+SLCD slcd; //define LCD display
+Serial pc(USBTX, USBRX);
+
+Timer dataTimer;
+Timer ButtonTimer; // for reading button states
+DigitalIn buttons[NUMBUTS] = {RBUT, LBUT};
+float tsidata;
+int displayState;
+
+void initialize_global_vars(){
+    pc.printf(PROGNAME);
+    // set up DAQ timers
+    ButtonTimer.start();
+    ButtonTimer.reset();
+    dataTimer.start();
+    dataTimer.reset(); 
+} 
+
+void LCDMess(char *lMess){
+        slcd.Home();
+        slcd.clear();
+        slcd.printf(lMess);
+}
+
+int main(void) {
+    int i;
+    char lcdData[LCDCHARLEN];
+    float lastTouch = 0.0;
+    TSISensor tsi;
+    float tempTSI;
+    PwmOut gled(LED_GREEN);
+    PwmOut rled(LED_RED);
+    
+    initialize_global_vars();
+
+     while (true) {
+        if (ButtonTimer > BUTTONTIME){
+            for (i=0; i<NUMBUTS; i++){ // index will be 0 or 1 
+                if(!buttons[i]) { 
+                    displayState = i; //set display state
+                } // if ! buttons
+            }// for loop to look at buttons  
+            
+        ButtonTimer.reset();
+        }//end if buttonTimer
+        
+        //if statements to do stuff based off of display state
+        
+        //press right button - SELECT MODE (red led)
+        if (displayState == 0){
+            rled = 0.0;
+            gled = 1.0;
+            
+            sprintf (lcdData,"%2.1f",tsidata*100);  
+            
+        //if statement to read tsi
+        if(dataTimer.read() > DATAINTERVAL){
+            dataTimer.reset();                               
+            tempTSI = tsi.readPercentage();        
+            if (tempTSI > TSILIMIT){
+                tsidata = tempTSI;
+                if (fabs(tsidata - lastTouch)> PRINTDELTA){
+                    pc.printf("Position %0.4f\n\r", tsidata);
+                }           
+            }
+            lastTouch=tsidata;
+        }// end if statement to read tsi
+            } //end if statement for display state = 0
+        //press left button - CALC MODE (green led)
+        else if (displayState == 1){
+            rled = 1.0;
+            gled = 0.0;
+            
+            float data = tsidata*100;
+            
+            float xOld = 0.0;
+            float xNew = 0.0;
+            
+            //calculate newton's method for square root
+            xOld = float(data/2.5); //make first guess
+            for (int x = 0; x< 20; x++){
+                xNew =  0.5 * (xOld + data/xOld) ;
+                float delta = fabs(xNew-xOld); //compare new and old values
+                if (delta < 1e-7)
+                    break;
+                else
+                    xOld = xNew; //replace calculated  value and retry
+                }//end for loop
+
+            //display data
+            sprintf (lcdData,"%1.2f",xNew);  
+           
+        } //end displaystate 1
+        
+    
+    LCDMess(lcdData); 
+    } //end while true
+}//end main
\ No newline at end of file