Diff: main.cpp

Revision:

0:41dfb0b1f108

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Sep 09 05:40:54 2016 +0000
@@ -0,0 +1,59 @@
+#include "mbed.h"
+#define pwm_period_us 500
+//#define pwm_pulsewidth_us 400
+//實驗說明:利用鍵盤+-符號來控制馬達速度
+PwmOut pwm_1(D9);
+PwmOut pwm_2(D10);
+PwmOut pwm_3(D11);
+float pwm = 0.5;
+DigitalIn button(USER_BUTTON);
+int main()
+{
+    char a;
+    pwm_1.period_us(pwm_period_us);
+    pwm_2.period_us(pwm_period_us);
+    pwm_3.period_us(pwm_period_us);
+
+    pwm_1.write(0.5);
+    pwm_2.write(0.5);
+    pwm_3.write(0.5);
+    printf("PWM all RESET to %.1f %%\n", pwm_1.read() * 100);
+
+    while(1) {
+        scanf("%c",&a);
+        switch (a) {
+            case '+':
+                pwm += 0.05;
+                pwm_1.write(pwm);
+                pwm_2.write(pwm);
+                pwm_3.write(pwm);
+                printf("%c ; PWM all set to %.1f %%\n", a, pwm_1.read() * 100);
+                break;
+            case '-':
+                pwm -= 0.05;
+                pwm_1.write(pwm);
+                pwm_2.write(pwm);
+                pwm_3.write(pwm);
+                printf("%c ; PWM all set to %.1f %%\n", a, pwm_1.read() * 100);
+                break;
+            /*case '3':
+                pwm_3.write(pwm);
+                printf("%c ; pwm_3 set to %.1f %%\n", a, pwm_3.read() * 100);
+                break;
+                
+                case '0':
+                    pwm_1.write(0.5);
+                    pwm_2.write(0.5);
+                    pwm_3.write(0.5);
+                    printf("%c ; pwm all reset to %.1f %%\n", a, pwm_1.read() * 100);
+                    break;
+                */
+            default:
+                pwm_1.write(0.5);
+                pwm_2.write(0.5);
+                pwm_3.write(0.5);
+                printf("PWM all RESET to %.1f %%\n", pwm_1.read() * 100);
+                break;
+        }
+    }
+}