Diff: main.cpp

Revision:

68:61bde79fc489

Parent:

67:9015fa015c73

Child:

69:9c1bb616a393

--- a/main.cpp	Thu Aug 23 13:49:20 2018 +0000
+++ b/main.cpp	Mon Oct 01 01:51:02 2018 +0000
@@ -1,27 +1,85 @@
 #include "mbed.h"
 
-Serial pc(USBTX, USBRX);
-
-// Initialize a pins to perform analog and digital output functions
-AnalogOut aout(p18);
-AnalogIn ain(p20);
+// In the sections below, change
+// /* to // and */ to // to make a program active
 
-char text[128];
-float voltage;
-// Adjust VCC to get best scaling
-float VCC1=3.292;
-float VCC2=3.292;
+// PROGRAM #1
+//
+// This controls two digital out lines connected to LEDs
+// and two others that go outon pins 21 and 22
+// The program alternates these lines with a 2 second delay;
+DigitalOut led1(LED1);  // Controls LED1
+DigitalOut led2(LED2);  // Controls LED2
+DigitalOut d1(p21);  // Controls pin 21
+DigitalOut d2(p22);  // Controls pin 22
+
+bool valOut = false; //logical variable to flip on and off
 
 int main(void){
-   while (1) {
-        pc.printf("Please enter an output voltage\n\r");
-        pc.scanf("%s", text);
-        voltage = atof(text);
-        pc.printf("Voltage output is %f\n\r", voltage);
-        // set the output value to be voltage/VCC
-        aout = voltage/VCC1;
-        // read the output voltage
-        pc.printf("Voltage read is %f\n\r", ain*VCC2);
+  while(1){
+    led1 = valOut;
+    d1 = valOut;
+    led2 = !valOut;
+    d2 = !valOut;
+    valOut = !valOut;
+    wait(2.);  // wait 2 seconds. Use wait_ms or wait_us using integers of milli or micro seconds
+  }
+}
+//
+
+// PROGRAM #2
+/*
+// This program uses PWM to vary the LED brightness
+PwmOut led1(LED1);  // PWM output will control LED1
+PwmOut led2(LED2);  // PWM output will control LED2
+// Could use PwmOut a1(p21) through p(26)
+float brightness1 = 0.1;
+float brightness2 = 0.5;
+
+int main() {
+    // Initialize
+    led1.period(0.01);  //  period in seconds both outputs use the same period
+    // Could use led.period_ms (for milliseconds) or led.period_us (for microseconds)
+    // Could use led.pulsewidth (or led.pulsewidth_ms, led.pulsewidth_us) to set the on width for a given frequency
+    
+    while(1) {
+        led1 = brightness1; // set the fraction of period on
+        led2 = brightness2; // set the fraction of period on
+        // Could use led.write(brightness);
     }
 }
+*/
 
+// PROGRAM #3
+/*
+// This program writes out a sine wave
+AnalogOut  aout(p18);
+int main(void){
+    while(1){
+        for (int k = 0; k < 32; k++){
+            aout = (1+sin(3.14159*k/16.))/2.;
+        }
+    }
+ }
+*/
+
+
+// PROGRAM #4
+/*
+// This program writes out a sine wave quickly
+int main(void){
+// Define an array to hold the function values
+// Change the 32 if you want more or fewer values
+    float temp[32];
+// If you calculate the values before you output them
+// the wave can be much faster
+    for (int k = 0; k < 32; k++){
+        temp[k] = (1+sin(3.14159*k/16.))/2.;
+    }
+    while(1){
+      for (int k = 0; k < 32; k++){
+            aout = temp[k];
+      }
+    }
+ }
+*/
\ No newline at end of file