Diff: IO_pwm/IO_pwm.cpp

Revision:

0:d0c188d2cd1c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IO_pwm/IO_pwm.cpp	Sat Mar 16 01:58:24 2019 +0000
@@ -0,0 +1,53 @@
+/*
+cpp文件：
+类名::构造函数:
+    _对象名（属性）        //给类中的变量赋值，也可以在花括号中用等于号赋值，主要针对是构造函数中的变量
+{
+    _对象名.函数(参数)；        //在生成构造函数的时候执行这个代码块
+}
+
+void 类名::函数名(参数)
+{
+    函数体；
+}
+*/
+
+#include "IO_pwm.h"
+#include "mbed.h"
+
+IO_pwm::IO_pwm(PinName n):
+    _n(n)
+{
+//    DigtalOut mypwm(_n);
+    on_delay=0;
+    off_delay=0;  
+}
+void IO_pwm::toggleOn(void) {
+    DigitalOut mypwm(_n);
+    mypwm = 1;
+    timer.attach_us(this,&IO_pwm::toggleOff, on_delay);                         //类里启动中断,函数名需要特殊处理,按照这个方式拷贝就可以了
+}
+
+void IO_pwm::toggleOff(void) {
+    DigitalOut mypwm(_n);
+    mypwm = 0;
+    timer.attach_us(this,&IO_pwm::toggleOn, off_delay);
+}
+
+// 周期p_us = signal period in micro_seconds
+// 占空比dc   = signal duty-cycle (0.0 to 1.0)
+void IO_pwm::pwm_io(int p_us, float dc) {
+    DigitalOut mypwm(_n);
+    timer.detach();
+    if ((p_us == 0) || (dc == 0)) {
+        mypwm = 0;
+        return;
+    }
+    if (dc >= 1) {
+        mypwm = 1;
+        return;
+    }
+    on_delay = (int)(p_us * dc);
+    off_delay = p_us - on_delay;
+    this->toggleOn();
+}