潘多拉用TIM CHI 做PWM输出，程序编译无错误，但没输出

发布于 2019-08-27 22:20:46 浏览：1985 订阅该版

[table=98%]
[tr][td]1、cube配置，生成代码
![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10422&size=300x300&key=c1865573b9195db2&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10435&size=300x300&key=dd2cf70920414409&nocache=yes&type=fixnone)

2、修改kconfig文件
![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10423&size=300x300&key=a9b50057910bacb8&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10431&size=300x300&key=3a91586a79d15e54&nocache=yes&type=fixnone)

3、env配置PWM1 CH1
![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10424&size=300x300&key=202395f133a6272d&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10430&size=300x300&key=894c9acf7c45eb5c&nocache=yes&type=fixnone)

4、修改驱动
![图六.png](/uploads/201908/27/221844dr4cn3c34zonacg9.png)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10433&size=300x300&key=6b22ebcee2296e6a&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10434&size=300x300&key=a972fe4d752d25e7&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10425&size=300x300&key=73c2c31cfafbad44&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10426&size=300x300&key=d385ec298fd084d0&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10427&size=300x300&key=de50beb2de3d325b&nocache=yes&type=fixnone)

5、线程例程
```c
#include <rtthread.h>
#include <drivers/rt_drv_pwm.h>

#define PWM_DEV_NAME            "pwm1"  /* PWM设备名称 */
#define PWM_DEV_CHANNEL         1     /* PWM通道 */
#define THREAD_PRIORITY         25      /* 线程优先级 */
#define THREAD_STACK_SIZE       512     /* 线程栈大小 */
#define THREAD_TIMESLICE        5       /* 线程时间片大小 */

static rt_thread_t tid1 = RT_NULL;      /* 线程句柄 */
struct rt_device_pwm *pwm_dev;          /* PWM设备句柄 */
static rt_uint32_t period = 500000;     /* 周期为0.5ms，单位为纳秒ns */
static rt_uint32_t pulse =  250000;           /* PWM脉冲宽度值的增减方向 */
                                                                                                                
/* 线程 pwm_entry 的入口函数 */
static void pwm_entry(void *parameter)
{
    rt_uint32_t count = 0;

while (1)
 {
 rt_thread_mdelay(50);
 rt_kprintf("pwm out pulse=%d ", pulse);
 /* step 2、设置 PWM 周期和脉冲宽度，输出特定的波形 */
 rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);
 }
 /* step 3、如果不再使用该通道，可以关闭 PWM 通道的输出 */
 // rt_pwm_disable(pwm_dev, PWM_DEV_CHANNEL);
}

static int pwm_test(int argc, char *argv[])
{
 rt_err_t sate1;
 /* step 1.1、查找 PWM 设备 */
 pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM_DEV_NAME);
 if (pwm_dev == RT_NULL)
 {
 rt_kprintf("pwm sample run failed! can't find %s device! ", PWM_DEV_NAME);
 return RT_ERROR;
 }
 rt_kprintf("pwm sample run success! find %s device! ", PWM_DEV_NAME);
 /* step 1.2、设置 PWM 周期和脉冲宽度默认值 */
 sate1=rt_pwm_set(pwm_dev, PWM_DEV_CHANNEL, period, pulse);
 rt_kprintf("sate1=%d ", sate1);
 /* step 1.3、使能 PWM 设备的输出通道 */
 sate1=rt_pwm_enable(pwm_dev, PWM_DEV_CHANNEL);
 rt_kprintf("sate2=%d ", sate1);

/* 创建线程，名称是 pwm_thread ，入口是 pwm_entry*/
    tid1 = rt_thread_create("pwm_thread",
                             pwm_entry,
                             RT_NULL,
                             THREAD_STACK_SIZE,
                             THREAD_PRIORITY,
                             THREAD_TIMESLICE);

/* 如果获得线程控制块，启动这个线程 */
    if (tid1 != RT_NULL)
        rt_thread_startup(tid1);

return RT_EOK;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(pwm_test, pwm sample);
```

6、现象
发送 pwm_test命令 ，返回

![1,1](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10428&size=300x300&key=7d0d17937baff484&nocache=yes&type=fixnone)

![110,0](https://www.rt-thread.org/qa/forum.php?mod=image&aid=10429&size=300x300&key=f33015a11157b89d&nocache=yes&type=fixnone)

但是板子上的灯没有反应

各位大佬，求找找问题！万分感谢！！！！

[/td][/tr]
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![图三.png](https://oss-club.rt-thread.org/uploads/201908/27/221845jjknhppyvep5dyff.png)

![图二.png](https://oss-club.rt-thread.org/uploads/201908/27/221844rv59iubtgapib6x9.png)

![图12.png](https://oss-club.rt-thread.org/uploads/201908/27/221844tk7916u8buvvub6d.png)

![QQ截图20190827221319.png](https://oss-club.rt-thread.org/uploads/201908/27/221844nopxzptz42amt5th.png)

![图四.png](https://oss-club.rt-thread.org/uploads/201908/27/221845ove9ttvtjgufsuue.png)

![图一.png](https://oss-club.rt-thread.org/uploads/201908/27/221845yvs428j4ya24ys4f.png)

14 个回答

tyustli 2019-08-27

这家伙很懒，什么也没写！

君墨竹 2019-08-27

这家伙很懒，什么也没写！

summerxyh 2019-08-28

这家伙很懒，什么也没写！

君墨竹 2019-08-28

这家伙很懒，什么也没写！

flyangus 2019-09-01

这家伙很懒，什么也没写！

flyangus 2019-09-01

这家伙很懒，什么也没写！

flyangus 2019-09-01

这家伙很懒，什么也没写！

[i=s] 本帖最后由 flyangus 于 2019-9-1 22:18 编辑 [/i]

#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>

/* defined the LED0 pin: PE7 */
//#define LED0_PIN    GET_PIN(E, 7)

//PWM1 CH1 是IO PE9，蓝色led
#define PWM1_DEVICE_NAME "pwm2"
#define PWM1_DEVICE_CHANNEL 3
 
 
#define PWM1_PERIOD 500000 //周期的单位是ns，0.5ms
#define PWM1_STEP 20000 //pwm变化量
static struct rt_device_pwm *pwm_dev;
 
void pwm_led_entry(void *pra)
{
 static rt_uint32_t pwm_pulse = 0;
 static int dir = 0;
 
 while(1)
 {
 switch(dir)
 {
 case 0: pwm_pulse += PWM1_STEP;
 pwm_pulse = (pwm_pulse >= PWM1_PERIOD)? PWM1_PERIOD : pwm_pulse;
 if(pwm_pulse == PWM1_PERIOD)dir = 1; 
 
 break;
 
 case 1:pwm_pulse -= PWM1_STEP;
 pwm_pulse = (pwm_pulse <= 0)? 0 : pwm_pulse;
 if(pwm_pulse == 0)dir = 0; 
 break;
 
 default:
 break;
 }
 rt_pwm_set(pwm_dev,PWM1_DEVICE_CHANNEL,PWM1_PERIOD,pwm_pulse);
 rt_kprintf("%s %d %d \r\n",pwm_dev,PWM1_DEVICE_CHANNEL,pwm_pulse);
 rt_thread_mdelay(50); 
 } 
}
 
int pwm_sample(void)
{
 static rt_thread_t pwm_led_thread;
 
 
 //初始化pwm设备
 pwm_dev = (struct rt_device_pwm *)rt_device_find(PWM1_DEVICE_NAME);
 if(pwm_dev == RT_NULL)
 {
 rt_kprintf("cannot find pwmdev\n");
 return RT_ERROR;
 }
 
 rt_pwm_set(pwm_dev,PWM1_DEVICE_CHANNEL,PWM1_PERIOD,0);//初始默认值
 rt_pwm_enable(pwm_dev,PWM1_DEVICE_CHANNEL);
 
 
 //创建一个使用pwm设备的线程，如点亮led的线程
 pwm_led_thread = rt_thread_create("led_thread",pwm_led_entry,0,1024,10,10);
 
 if(pwm_led_thread == RT_NULL)
 {
 rt_kprintf("create pwm thread failed\n");
 return RT_ERROR;
 }
 
 rt_thread_startup(pwm_led_thread);
 
 return RT_EOK;
 
}
MSH_CMD_EXPORT(pwm_sample,pwm sample);

int main(void)
{
    //int count = 1;
    /* set LED0 pin mode to output */
    //rt_pin_mode(LED0_PIN, PIN_MODE_OUTPUT);
    //rt_pin_write(LED0_PIN, PIN_HIGH);
        
    while (1)
    {
        //rt_pin_write(LED0_PIN, PIN_HIGH);
        //rt_thread_mdelay(500);
        //rt_pin_write(LED0_PIN, PIN_LOW);
        rt_thread_mdelay(1000);
    }

return RT_EOK;
}