Diff: main.cpp

Revision:

0:c84bafdeada4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Jan 25 02:27:27 2018 +0000
@@ -0,0 +1,193 @@
+/*INSTITUTO POLITÉCNICO NACIONAL
+  ESCUELA SUPERIOR DE INGENIERÍA MECÁNICA Y ELÉCTRICA
+  INGENIERÍA ELÉCTRICA
+  SPWM & THPWM
+  RIVERA GUILLEN GUSTAVO
+  2016*/
+#include "mbed.h"
+
+//Number of dutycycle steps for output wave
+#define SINE_STEPS        32
+//Frequency of output sine in Hz
+#define SINE_OUT_FREQ     60
+
+//Constants to compute the sine waveform
+#define PI                            3.14159265359f
+#define SINE_STEPS_RAD               (2.0f * PI / (float)SINE_STEPS)
+#define ANGLE_RAD_PHASE_A             0.0f
+#define ANGLE_RAD_PHASE_B             2.09439510239f
+#define ANGLE_RAD_PHASE_C             4.18879020479f
+#define CONST_A                       1.15470053838f
+#define CONST_B                       0.19245008973f
+
+//Frequency of Pulse Width Modulated signal in Hz
+#define PWM_FREQ          5000
+
+//Comunication Serial to PC
+Serial pc(USBTX, USBRX);
+
+//PWM pin
+PwmOut Pwm_Phase_A (PTB0);
+PwmOut Pwm_Phase_B (PTB1);
+PwmOut Pwm_Phase_C (PTB2);
+
+//Heartbeat LED
+DigitalOut Led_sine(LED1,1);
+DigitalOut Led_3rd (LED2,1);
+
+//Tickers to update the PWM dutycycle
+Ticker pwm_ticker1;
+Ticker pwm_ticker2;
+
+//Table to generate the sine waveform using dutycycles
+float sine_duty_A[SINE_STEPS];
+float sine_duty_B[SINE_STEPS];
+float sine_duty_C[SINE_STEPS];
+
+float sine_duty_3rd_harmonic_A[SINE_STEPS];
+float sine_duty_3rd_harmonic_B[SINE_STEPS];
+float sine_duty_3rd_harmonic_C[SINE_STEPS];
+
+
+//Ticker calls this fucntion to update the PWM dutycycle
+
+void pwm_sinusoidal_duty_updater()
+{
+    static int idx=0;
+
+    Pwm_Phase_A.write(sine_duty_A[idx]);  // Set the dutycycle % to next value in array
+    Pwm_Phase_B.write(sine_duty_B[idx]);
+    Pwm_Phase_C.write(sine_duty_C[idx]);
+
+    idx++;                         // Increment the idx
+    if (idx == SINE_STEPS) idx=0;  // Reset the idx when teh end has been reached
+
+}
+
+//Ticker calls this fucntion to update the PWM dutycycle
+void pwm_sinusoidal_3rd_harmonic_duty_updater()
+{
+
+    static int idx=0;
+
+    Pwm_Phase_A.write(sine_duty_3rd_harmonic_A[idx]);   // Set the dutycycle % to next value in array
+    Pwm_Phase_B.write(sine_duty_3rd_harmonic_B[idx]);
+    Pwm_Phase_C.write(sine_duty_3rd_harmonic_C[idx]);
+
+    idx++;                         // Increment the idx
+    if (idx == SINE_STEPS) idx=0;  // Reset the idx when teh end has been reached
+
+}
+
+//main principal
+int main()
+{
+//Comunication Serial speed
+    pc.baud(9600);
+
+//Local variables
+    int i;
+    int k=0;
+
+//Caculate to generate the sine waveform using dutycycles
+    for (i=0; i<SINE_STEPS; i++) 
+    {
+        //Phase A
+       
+
+        sine_duty_A[i] = ( sin(i * SINE_STEPS_RAD+ANGLE_RAD_PHASE_A) + 1.0f ) / 2.0f;  
+        // convert sine (-1.0 .. +1.0) into dutycycle (0.0 .. 1.0)
+
+        //Phase B
+
+        sine_duty_B[i] = ( sin(i * SINE_STEPS_RAD+ANGLE_RAD_PHASE_B) + 1.0f ) / 2.0f;  
+        // convert sine (-1.0 .. +1.0) into dutycycle (0.0 .. 1.0)
+
+        //Phase C
+
+        sine_duty_C[i] = ( sin(i * SINE_STEPS_RAD+ANGLE_RAD_PHASE_C) + 1.0f ) / 2.0f;  
+        // convert sine (-1.0 .. +1.0) into dutycycle (0.0 .. 1.0)
+
+    }
+
+    for (i=0; i<SINE_STEPS; i++) 
+    {
+        //Phase A
+        sine_duty_3rd_harmonic_A[i] = (( CONST_A*sin(i * SINE_STEPS_RAD+ANGLE_RAD_PHASE_A)+CONST_B*sin(3.0f*i * SINE_STEPS_RAD)) + 1.0f ) / 2.0f;  
+        // convert sine (-1.0 .. +1.0) into dutycycle (0.0 .. 1.0)
+
+        //Phase B
+
+        sine_duty_3rd_harmonic_B[i] = (( CONST_A*sin(i * SINE_STEPS_RAD+ANGLE_RAD_PHASE_B)+CONST_B*sin(3.0f*i * SINE_STEPS_RAD)) + 1.0f ) / 2.0f;  
+        // convert sine (-1.0 .. +1.0) into dutycycle (0.0 .. 1.0)
+
+        //Pahse C
+
+        sine_duty_3rd_harmonic_C[i] = (( CONST_A*sin(i * SINE_STEPS_RAD+ANGLE_RAD_PHASE_C)+CONST_B*sin(3.0f*i * SINE_STEPS_RAD)) + 1.0f ) / 2.0f;  
+        // convert sine (-1.0 .. +1.0) into dutycycle (0.0 .. 1.0)
+    }
+
+    // Set PWM frequency in Hz
+    Pwm_Phase_A.period( 1.0f / (float) PWM_FREQ);
+    Pwm_Phase_B.period( 1.0f / (float) PWM_FREQ);
+    Pwm_Phase_C.period( 1.0f / (float) PWM_FREQ);
+
+    while(1)
+
+    {
+
+        pc.printf("\rElige una opcion\r\n");
+        pc.printf("1. SPWM\r\n");
+        pc.printf("2. THPWM\r\n");
+        int Menu=pc.getc();
+
+        switch (Menu) 
+        {
+
+            case '1':
+
+                //Indicator Led
+                Led_sine=0;
+                Led_3rd=1;
+
+
+
+                // Init the Ticker to call the dutycyle updater at the required interval
+                // The update should be at (SINE_STEPS * SINE_OUT_FREQ)
+                pwm_ticker1.attach(&pwm_sinusoidal_duty_updater, 1.0f / (float)(SINE_STEPS * SINE_OUT_FREQ));
+
+                pc.printf("cycle duty= %3.3f\t%3.3f\t%3.3f\r\n", Pwm_Phase_A.read()*100,Pwm_Phase_B.read()*100,Pwm_Phase_C.read()*100);
+
+
+                break;
+
+
+            case '2':
+                Led_3rd=0;
+                Led_sine=1;
+
+                // Init the Ticker to call the dutycyle updater at the required interval
+                // The update should be at (SINE_STEPS * SINE_OUT_FREQ)
+                pwm_ticker2.attach(&pwm_sinusoidal_3rd_harmonic_duty_updater, 1.0f / (float)(SINE_STEPS * SINE_OUT_FREQ));
+
+                pc.printf("cycle duty_3rd= %3.3f\t%3.3f\t%3.3f\r\n", Pwm_Phase_A.read()*100,Pwm_Phase_B.read()*100,Pwm_Phase_C.read()*100);
+
+                break;
+
+                //Default menu
+            default:
+                pc.printf("Invalido \r\n");
+                Led_3rd=1;
+                Led_sine=1;
+                k=3;
+        }
+
+        //Exit to menu
+        if(k>2) {
+            pc.printf("End\r\n");
+            break;
+        }
+
+    }
+
+}
\ No newline at end of file