Keisha Brathwaite
/
KBrat-SSD541-Midterm-Q2a
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kl46z_slider_mid_v1
by 
Stanley Cohen
Revision 2:8b60d4eb7388, committed 2016-10-10
- Comitter:
- tisbrat
- Date:
- Mon Oct 10 05:56:09 2016 +0000
- Parent:
- 1:44dcf262c7dd
- Commit message:
- KBrat-SSD541-Midterm-Q2a
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Sat Oct 01 22:10:10 2016 +0000
+++ b/main.cpp Mon Oct 10 05:56:09 2016 +0000
@@ -1,30 +1,32 @@
#include "mbed.h"
-#include <math.h>
+#include <math.h>
+#include <cmath>
#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 NUMBUTS 2 //two buttons
+#define LBUT PTC12 //left button // port addresses for buttons
+#define RBUT PTC3 //right button
+#define ARGUMENTSTATE 0 //Switch case 0
+#define ANSWERSTATE 1 //Switch case 1
+#define LCDTIME 1.0 //LCD Timer 1 sec
+#define TSILIMIT 0.01
#define PRINTDELTA 0.01
#define LCDCHARLEN 10
#define DATAINTERVAL 0.1
#define BUTTONTIME 0.1
-#define PROGNAME "kl46z_slider_mid_v1\n\r"
+#define PROGNAME "KBrat-SSD541-Midterm-Q2a \nNewton's Method of Square Root\n\r"
-SLCD slcd; //define LCD display
+SLCD slcd;//define LCD display globally define
Serial pc(USBTX, USBRX);
-Timer dataTimer;
-Timer ButtonTimer; // for reading button states
+Timer LCDTimer; //for reading lcd input state for display
+Timer dataTimer; //for reading data input states(from the slider 1-100)
+Timer ButtonTimer; //for reading button states
DigitalIn buttons[NUMBUTS] = {RBUT, LBUT};
float tsidata;
-int displayState;
+int displayState = ARGUMENTSTATE;//Make initial state ARGUMENTSTATE
void initialize_global_vars(){
pc.printf(PROGNAME);
@@ -32,7 +34,9 @@
ButtonTimer.start();
ButtonTimer.reset();
dataTimer.start();
- dataTimer.reset();
+ dataTimer.reset();
+ LCDTimer.start();
+ LCDTimer.reset();
}
void LCDMess(char *lMess){
@@ -44,7 +48,7 @@
int main(void) {
int i;
char lcdData[LCDCHARLEN];
- float lastTouch = 0.0;
+ float lastTouch = 0.0; //intial lastTouch starts at 0.0
TSISensor tsi;
float tempTSI;
PwmOut gled(LED_GREEN);
@@ -54,30 +58,77 @@
while (true) {
if (ButtonTimer > BUTTONTIME){
- for (i=0; i<NUMBUTS; i++){ // index will be 0 or 1
+ for (i=0; i<NUMBUTS; i++){ // index will be 0 or 1 //find buttons
if(!buttons[i]) {
- displayState = i;
- // do something here.
-
+ displayState = i;
} // if ! buttons
}// for loop to look at buttons
ButtonTimer.reset();
- sprintf (lcdData,"%0.4f",tsidata);
+ }
+
+
+ if(LCDTimer.read() > LCDTIME){
+ LCDTimer.reset();
+ switch (displayState){//start switch case for displayState
+
+ case ARGUMENTSTATE: {// case #0
+ rled = 0.0;//red light on
+ gled = 1.0;//green light off
+
+ if(dataTimer.read() > DATAINTERVAL){
+ dataTimer.reset();
+ tempTSI = tsi.readPercentage();
+ if (tempTSI > TSILIMIT){
+ tsidata = tempTSI;
+ if (fabs(tsidata - lastTouch)> PRINTDELTA){
+ pc.printf("Position %2.0f\n\r", tsidata*100);//print to computer tsidata*100 to get a range from 1-100
+ }
+ }
+ lastTouch = tsidata;
+ }
+
+ sprintf (lcdData,"%2.1f",tsidata*100); //print to lcd screen tsidata*100 to get a range from 1-100
+ LCDMess(lcdData);
+
+ break;
+ }
+
+ case ANSWERSTATE: {
+
+ rled = 1.0;//red light off
+ gled = 0.0;//green light on
+
+ /*-------With built in sqrt function-----*/
+ /*double slid_input, sq_root;
+ slid_input = tsidata*100;
+ if (slid_input > 0){
+ sq_root = sqrt(slid_input);
+ pc.printf ("Square root(%f) = %f\n", slid_input, sq_root);
+ sprintf (lcdData,"%2.2f", sq_root);
+ LCDMess(lcdData);
+ //return 0;
+ }*/
+
+ /*-------Without built in sqrt function-----*/
+ double x1, slid_input, sq_root;
+ slid_input = tsidata*100;
+ if(slid_input > 0){
+ sq_root = log(slid_input);
+ do {
+ x1 = (sq_root - (((sq_root * sq_root) - slid_input)/(2* sq_root))); //Newton's Method
+ sq_root = x1;
+
+ } while ((x1 * x1) > slid_input);
+ pc.printf ("Newton's Method: Square root(%2.2f) = %2.2f\n", slid_input, sq_root);
+ sprintf (lcdData,"%2.2f", sq_root);
+ LCDMess(lcdData);
+ }
+ break;
+ }// end switch case displayState
+ }
LCDMess(lcdData);
- rled = 0.0;
- gled = 1.0;
+ } // end LCD timer.read
- }
- 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 while(true)
+
}
\ No newline at end of file