liang brain
/
Ex_IO_pwm
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Revision 0:d0c188d2cd1c, committed 2019-03-16
- Comitter:
- brainliang
- Date:
- Sat Mar 16 01:58:24 2019 +0000
- Commit message:
- IO_pwm
Changed in this revision
--- /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();
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/IO_pwm/IO_pwm.h Sat Mar 16 01:58:24 2019 +0000
@@ -0,0 +1,35 @@
+/*
+h文件
+class 类名
+{
+public:
+ 类名::构造函数(变量参数)；
+ 公有函数声明；
+protected:
+ 私有对象声明；
+ 私有变量声明；
+ 私有函数声明；
+}；
+*/
+
+#ifndef IO_pwm_H_
+#define IO_pwm_H_
+#include "mbed.h"
+class IO_pwm
+{
+public:
+ IO_pwm(PinName n);
+ void pwm_io(int p_us, float dc);
+
+protected:
+ //PWM的周期=on_delay+off_delay,高电平时间=on_delay
+ int on_delay;
+ int off_delay;
+
+ PinName _n;
+ // DigitalOutr mypwm;
+ Timeout timer;
+ void toggleOn(void);
+ void toggleOff(void);
+};
+#endif
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat Mar 16 01:58:24 2019 +0000
@@ -0,0 +1,21 @@
+/*
+用普通IO模拟输出PWM
+*/
+
+#include "mbed.h"
+#include "IO_pwm.h"
+
+DigitalOut my_led(PC_13);
+IO_pwm my_pwm(PA_5); // IO used by pwm_io function
+int main() {
+
+ my_pwm.pwm_io(20000, 0.075); // 20ms - 25%,舵机控制周期20ms占空比范围0.025--0.125
+
+ while(1) {
+ my_pwm.pwm_io(20000, 0.025); // 20ms - 2.5%
+ my_led = !my_led;
+ wait(0.5);
+ my_pwm.pwm_io(20000, 0.125); // 20ms - 12.5%
+ wait(0.5);
+ }
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sat Mar 16 01:58:24 2019 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/5aab5a7997ee \ No newline at end of file