rtthread配置pwm控制stmf429zi的led灯
时间: 2023-08-03 11:04:09 浏览: 156
好的,下面是在 RT-Thread 中配置 PWM 控制 STM32F429ZI 的 LED 灯的步骤:
1. 首先,需要在 RT-Thread 的 BSP 配置文件中启用 PWM 功能,可以在文件 rtconfig.h 中添加以下代码:
```
#define BSP_USING_PWM
```
2. 在 BSP 中实现 PWM 设备的操作函数,例如在文件 stm32f4xx_pwm.c 中实现以下函数:
```
static rt_err_t stm32_pwm_control(struct rt_pwm_device *pwm, int cmd, void *arg)
{
switch (cmd)
{
case PWM_CMD_ENABLE:
// 启用 PWM
break;
case PWM_CMD_DISABLE:
// 禁用 PWM
break;
default:
return RT_EINVAL;
}
return RT_EOK;
}
static rt_err_t stm32_pwm_set(struct rt_pwm_device *pwm, rt_uint32_t channel, rt_uint32_t period, rt_uint32_t pulse)
{
// 配置 PWM 通道的周期和占空比
return RT_EOK;
}
// 注册 PWM 设备
void rt_hw_pwm_init(void)
{
static struct rt_pwm_device pwm;
pwm.parent.type = RT_Device_Class_PWM;
pwm.control = stm32_pwm_control;
pwm.set = stm32_pwm_set;
rt_device_pwm_register(&pwm, "pwm", 0);
}
```
3. 在 BSP 中实现 LED 灯的控制函数,例如在文件 board.c 中实现以下函数:
```
#include <rtthread.h>
#include <rtdevice.h>
#define LED_PWM_CHANNEL 0
static rt_device_t pwm_dev;
void rt_hw_led_init(void)
{
// 打开 PWM 设备
pwm_dev = rt_device_find("pwm");
rt_device_open(pwm_dev, RT_DEVICE_OFLAG_WRONLY);
// 设置 PWM 通道的周期和占空比
rt_pwm_set(pwm_dev, LED_PWM_CHANNEL, 1000, 500);
// 启用 PWM
rt_pwm_control(pwm_dev, PWM_CMD_ENABLE, RT_NULL);
}
void rt_hw_led_on(void)
{
// 增加占空比,使 LED 灯亮起来
rt_pwm_set(pwm_dev, LED_PWM_CHANNEL, 1000, 800);
}
void rt_hw_led_off(void)
{
// 减小占空比,使 LED 灯熄灭
rt_pwm_set(pwm_dev, LED_PWM_CHANNEL, 1000, 200);
}
```
4. 在应用程序中调用 LED 灯的控制函数:
```
#include <rtthread.h>
int main(void)
{
rt_hw_led_init();
while (1)
{
rt_hw_led_on();
rt_thread_mdelay(500);
rt_hw_led_off();
rt_thread_mdelay(500);
}
return RT_EOK;
}
```
以上是在 RT-Thread 中配置 PWM 控制 STM32F429ZI 的 LED 灯的步骤,希望能帮助到你。
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