Diff: main.cpp

Revision:

0:08b1f4a462c7

Child:

1:28154deb13f1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jun 13 21:43:24 2017 +0000
@@ -0,0 +1,38 @@
+#include "mbed.h"
+
+AnalogOut my_output1(PA_4);
+//AnalogOut my_output2(PA_5);
+//AnalogOut my_output3(PA_6);
+
+#define PI        (3.141592653589793238462)
+#define AMPLITUDE (1.0)    // x * 3.3V
+#define PHASE     (PI * 1) // 2*pi is one period
+#define RANGE     (0x7FFF)
+#define OFFSET    (0x7FFF)
+
+// Configuration for sinewave output
+#define BUFFER_SIZE (360)
+uint16_t buffer[BUFFER_SIZE];
+
+void calculate_sinewave(void);
+
+int main() {
+    printf("Sinewave example\n");
+    calculate_sinewave();
+    while(1) {      
+        // sinewave output
+        for (int i = 0; i < BUFFER_SIZE; i++) {
+            my_output1.write_u16(buffer[i]);
+            //my_output2.write_u16(buffer[i]);
+            //my_output3.write_u16(buffer[i]);
+        }
+    }
+}
+
+// Create the sinewave buffer
+void calculate_sinewave(void){
+  for (int i = 0; i < BUFFER_SIZE; i++) {
+     double rads = (PI * i)/180.0; // Convert degree in radian
+     buffer[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET);
+  }
+}