Diff: main.cpp

Revision:

2:b88fecb5232c

Parent:

1:760c5b759868

diff -r 760c5b759868 -r b88fecb5232c main.cpp
--- a/main.cpp	Mon Jul 29 08:40:09 2019 +0000
+++ b/main.cpp	Mon Jul 29 20:33:04 2019 +0000
@@ -1,24 +1,25 @@
+//lab 2_4_1_Modified.
+// Modify the code so that the for loop parameters are variables which can be initialised at the start of the program
+// and modified in the while loop to produce a different sound second time around.
 #include "mbed.h"
-//modified version of initial program.
-// declare varibles for 'i+=' (rate of change) and spkr.period calculation (pitch).
+
 DigitalIn fire(p14); // centre pin of joystick.
 PwmOut spkr(p26); // speaker output
-// add analog inputs for pot 1 & 2
-AnalogIn pot1(p19);
-AnalogIn pot2(p20);
-
+int b = 1; // base time for pwm output. this will be divided by the value of 'r'. This will increment up by 10 after first loop.
+int r = 100; // base value for the increment of float 'i'. This is used in the PWM calculation, and will increment up by 10 after the first loop. 
+int c = 0; //counter on loop.
 int main() {
-    while(1) {
-        float roc = (pot1*100); // read pot 1 and * by 100.
-        printf("pot1 = %.0f \n\r", (roc)); // used for display during testing.
-        float spk = (pot2*10); // read pot 1 and * by 10.
-        printf("pot2 = %.0f \n\r", (spk)); // display for testing
-        for (float i=2000.0; i<10000; i+=(roc)) { // increment i by the calculated roc each loop if the value at the start of the loop is less than 1000
-            spkr.period((spk)/i); // base time is taken for the pot 2 calculation.
+    while(c < 2) { // only repeat loop twice (c will increment after each pass), once c !<2 the program will stop.
+        for (float i=2000.0; i<10000; i+=r) { // increment i by 'r' each loop if the value at the start of the loop is less than 1000
+            spkr.period((b)/i); // base time/i
             spkr=0.5;
             wait(0.1);
     }
     spkr=0.0;
+    b += 10;// increment b by +10
+    r += 10; // increment r by +10
+    c +=1;// increment count by one.
+    printf("Count is %i \n\r", c); // only for display purposes during testing.
     while(!fire) {}
     }
 }