关于rt-thread的PWM框架在stm32f103vf应用的疑问

发布于 2018-11-19 17:56:19 浏览：3332 订阅该版

* 本帖最后由 fyywhy 于 2018-11-21 20:45 编辑 *

芯片：STM32F103VF.

一、准备项目

首先下载了最新的rt-thread代码。进行入stm32f103-HAL BSP

在env下
 menuconfig
进行配置
1.选中芯片STM32F103VF
2.选中 Using HSI as clock source
3.选中 Using PWM4
4.选中 Enable Channel 1
![快照1.png](/uploads/201811/21/203620zhns0sn635jibu4o.png)
![快照4.png](/uploads/201811/21/203620yzb5nh05np1acz9z.png)
5.保存
6.退出
7.在env下 scons --target=mdk5重新组织项目。

二、修改配置

1.选中STM32F103VF芯片
![快照2.png](/uploads/201811/21/203738vzk981yk31jgj668.png)

2.设置晶振频率8MHz
![快照3.png](/uploads/201811/21/203738oncjrlqkqmlrm6rm.png)
3.保存设置，进行编译
![快照5.png](/uploads/201811/21/203738ydfgzabd1ab0d966.png)
发现3个警告。
```/* pwm test cmd */
static int pwm_test(int argc, char **argv)
{
     char *pwmc = argv[1];
     rt_device_t pwmd = rt_device_find(argv[1]);
     struct rt_pwm_configuration cfg =
           {
                 .channel = 0,  /* 0-n */
                 .period = 100, /* unit:ns 1ns~4.29s:1Ghz~0.23hz */
                 .pulse = 50    /* unit:ns (pulse<=period) */
           };
      for (int i = 1; i < 5; i++)
      {
            cfg.channel = i;
            rt_device_control(pwmd, PWM_CMD_SET, &cfg);
            rt_device_control(pwmd, PWM_CMD_ENABLE, &cfg);
      }
}
MSH_CMD_EXPORT(pwm_test, pwm_test pwm1);```该在drv_pwm.c中
1.pwmc声明了但未使用
2.pwm_test没有返回值
3.最后一行没有留空行。
修改一下：
```/* pwm test cmd */
static int pwm_test(int argc, char **argv)
{
       char *pwmc = argv[1];
       rt_device_t pwmd = rt_device_find(pwmc);
       struct rt_pwm_configuration cfg =
           {
                 .channel = 0,  /* 0-n */
                 .period = 100, /* unit:ns 1ns~4.29s:1Ghz~0.23hz */
                 .pulse = 50    /* unit:ns (pulse<=period) */
           };
      for (int i = 1; i < 5; i++)
      {
            cfg.channel = i;
            rt_device_control(pwmd, PWM_CMD_SET, &cfg);
            rt_device_control(pwmd, PWM_CMD_ENABLE, &cfg);
      }
        return RT_EOK;
}
MSH_CMD_EXPORT(pwm_test, pwm_test pwm1);

```警告消除。:)

三、增加TIMER、PWM通道。
由于该BSP中仅有PWM1\2\3\4\5\8。但我需要用到PWM10。所以开始增加PWM10的功能。

1.增加htim10声明
```#ifdef BSP_USING_PWM10
TIM_HandleTypeDef htim10;
#endif```2.增加TIM10初始化函数
```#ifdef BSP_USING_PWM10
static void MX_TIM10_Init(void)
{
    TIM_OC_InitTypeDef sConfigOC;

htim10.Instance = TIM10;
    htim10.Init.Prescaler = 8;
    htim10.Init.CounterMode = TIM_COUNTERMODE_UP;
    htim10.Init.Period = 400;
    htim10.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
    htim10.Init.RepetitionCounter = 0;
    if (HAL_TIM_PWM_Init(&htim10) != HAL_OK)
    {
        RT_ASSERT(0);
    }

sConfigOC.OCMode = TIM_OCMODE_PWM1;
    sConfigOC.Pulse = 200;
    sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
    sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
    sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
    sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
    sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;

if (HAL_TIM_PWM_ConfigChannel(&htim10, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
    {
        RT_ASSERT(0);
    }
    HAL_TIM_MspPostInit(&htim10);
    rt_kprintf("time configure ok!<br>");
}
#endif /* BSP_USING_PWM10 
```3.增加TIM10时钟使能
```void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *tim_pwmHandle)
{
   ...
   ...
    else if (tim_pwmHandle->Instance == TIM10)
    {
        __HAL_RCC_TIM10_CLK_ENABLE();
                rt_kprintf("enable time10 rcc<br>");
    }
}```4.增加GPIO初始化
```static void HAL_TIM_MspPostInit(TIM_HandleTypeDef *timHandle)
{
    GPIO_InitTypeDef GPIO_InitStruct;
        ...
        ...
        ...
        else if(timHandle->Instance==TIM10)
        {
                /**TIM10 GPIO Configuration    
                PB8     ------> TIM10_CH1 
                */
                GPIO_InitStruct.Pin = GPIO_PIN_8;
                GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
                GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
                HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
                rt_kprintf("pin Pb8 configure ok!<br>");
        }
}```5.增加TIM10的失能函数
```void HAL_TIM_PWM_MspDeInit(TIM_HandleTypeDef *tim_pwmHandle)
{
        ...
        ...
        ...
    else if (tim_pwmHandle->Instance == TIM10)
    {
        __HAL_RCC_TIM10_CLK_DISABLE();
    }  
}```6.增加pwm10的注册函数
```int drv_pwm_init(void)
{
        ...
        ...
        ...
#ifdef BSP_USING_PWM10
    MX_TIM10_Init();
    rt_device_pwm_register(rt_calloc(1, sizeof(struct rt_device_pwm)), "pwm10", &drv_ops, &htim10);
#endif
    return 0;
}```7.由于pwm10只有一个通道，所以修改测试函数
```/* pwm test cmd */
static int pwm_test(int argc, char **argv)
{
    char *pwmc = argv[1];
    rt_device_t pwmd = rt_device_find(pwmc);
    struct rt_pwm_configuration cfg =
        {
            .channel = 1,  /* 0-n */
            .period = 400, /* unit:ns 1ns~4.29s:1Ghz~0.23hz */
            .pulse = 200    /* unit:ns (pulse<=period) */
        };
        cfg.channel = 1;
        rt_device_control(pwmd, PWM_CMD_SET, &cfg);
        rt_device_control(pwmd, PWM_CMD_ENABLE, &cfg);
        return RT_EOK;
}```8.在rtconfig.h中定义PWM10
```#define BSP_USING_PWM10```9.编译
  编译顺利通过。
10.烧写
11.测试
![快照6.png](/uploads/201811/21/203738sz3jjooic3vceikd.png)

很遗憾，没有pwm波输出。

四、做出的尝试

也怀疑过配置，怀疑硬件问题，好吧。用cubeMX生成相关文件裸机跑一下。

1、配置管脚

![快照7.png](/uploads/201811/21/203739usqt8u31u8yydqvs.png)

2.配置时钟

![快照8.png](/uploads/201811/21/203739oap11vt4mr5v4n2t.png)

3、配置timer

![快照9.png](/uploads/201811/21/203739kxpt4ez8pvx4p8jt.png)
4.生成项目
5.编译、烧写、测试

![417151247652908628.jpg](/uploads/201811/21/203738ddng1ooqzg89gt3l.jpg)

好吧，说明硬件和示波器、连线都没有问题。

五、查看两者差异
呃，真的没有发现差异在哪个地方，严重怀疑是时钟没搞对，rtt本身是初始化了时钟的啊，不知道哪里出了问题，请大家帮忙看一下。谢谢