Diff: main.cpp

Revision:

0:db770a1bef64

Child:

1:ed3c12662b08

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Feb 02 15:03:02 2018 +0000
@@ -0,0 +1,172 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "mbed.h"
+
+#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 (120)
+uint16_t buffer[BUFFER_SIZE];
+
+Serial pc(USBTX, USBRX);
+DigitalOut led1(LED1);
+DigitalIn button(PC_13);
+AnalogOut Vout(PA_4);
+
+// Create the sinewave buffer
+void calculate_sinewave(void){
+  for (int i = 0; i < BUFFER_SIZE; i++) {
+     double rads = (PI * (i*3))/180.0; // Convert degree in radian
+     buffer[i] = (uint16_t)(AMPLITUDE * (RANGE * (cos(rads + PHASE))) + OFFSET);
+  }
+}
+
+
+void sinecom(char* inputstring) {
+    
+    calculate_sinewave();
+    char s[20];
+    char sV[20];
+    char sF[20];
+    int pos, len;
+    int i = 1;
+    strcpy(s, inputstring);
+    len = strlen(s);
+    
+    
+    for (; i < len; i++){     
+            if (s[i] == ' '){
+                pos = i;
+                break;
+                }
+        }
+        
+    memcpy(sF, &s[pos], len-pos);          
+    memcpy(sV, &s[0], pos);
+    float inV = atof(sV);
+    float input_f = atof(sF);
+    pc.printf("Voltage: %f \n\r",inV);
+    pc.printf("Frequency: %f \n\r",input_f);
+
+    float wait_time = -9.955923 + (20817940 + 9.955923) / (1 + powf(input_f/0.0007111212, 1.049561));  //took data points and got this equation by estimating the graph with computer, results in 1-3% error
+    while(1) {      
+        // sinewave output
+        for (int i = 0; i < BUFFER_SIZE; i++) {
+            Vout.write_u16(buffer[i]/(3.30 * (1.00/inV)));
+            wait_us(wait_time);
+        }
+    }
+}
+
+void ledcom(char* onoff)
+{
+    if(strstr(onoff, "ON") != NULL)
+        led1 = 1; 
+    else 
+        led1 = 0;
+}
+
+void buttoncom(void)
+{
+    if(button.read() == 0){
+        pc.printf("PRESSED \n\r");
+        }
+    else if (button.read() != 0) {
+        pc.printf("RELEASED \n\r");
+        }
+}
+
+void blinkcom(char* reps)
+{
+    int x = atoi(reps);
+    int i;
+    for(i = 0; i < x; i++)
+    {
+        led1 = 1;
+        wait(.5);
+        led1 = 0;
+        wait(.5);
+    }
+}
+
+void dccom(char *volts)
+{
+    float volt = atof(volts);
+    pc.printf("voltage output: %4.2f \n\r", volt);
+    Vout.write_u16((volt/3.317)*0xFFFF); 
+}
+
+
+int main() {
+    char s[20];
+    pc.printf("Enter command \n\r");
+    while (true) {
+        int j = 0;
+        char c;
+    
+        while(true){
+            c = pc.getc();
+            pc.putc(c);
+            s[j]=c;
+            j++;
+            if(c == '\r'){
+                pc.printf("\n\r");
+                break;
+                }
+            }
+        s[j] = '\0'; 
+        char s_one[20];
+        char s_two[20];
+        int len = strlen(s);
+        int pos = 0;
+        
+        int i = 0;
+        for (; i < len; i++){
+            
+            if (s[i] == ' '){
+                pos = i;
+                break;
+                }
+            else if (i == len)
+                pos = len+1;
+        }
+        
+        
+        if (pos <= len){
+            memcpy(s_two, &s[pos], len-pos);
+            s_two[len - pos] = '\0';
+            
+            memcpy(s_one, &s[0], pos+1);
+            s_one[pos] = '\0';
+            }
+        
+        else {
+            memcpy(s_one, &s[0], len);
+            s_one[len] = '\0';
+            pc.printf("%s \n\r", s_one);
+            }//case where there is no space  
+
+
+        if (strstr(s_one, "LED") != NULL) {
+            ledcom(s_two);
+            }
+        else if (strstr(s, "BUTTON") != NULL) {
+            buttoncom();
+            }
+        else if (strstr(s_one, "BLINK") != NULL) {
+            blinkcom(s_two);
+            }
+        else if (strstr(s_one, "DC") != NULL) {
+            dccom(s_two);
+            }
+        else if (strstr(s_one, "SINE") != NULL){
+            sinecom(s_two);
+            }
+        else pc.printf("Bad command, try again buddy \n\r");      
+        }
+}
\ No newline at end of file