stm32f407pwm输出标准库
时间: 2023-11-13 21:02:44 浏览: 125
STM32F407 PWM输出
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要使用STM32F407的PWM输出功能,可以使用标准库中的TIM库。具体步骤如下:
1. 初始化TIM时钟和GPIO引脚
2. 配置TIM为PWM模式
3. 配置PWM输出参数,如占空比和频率
4. 启动TIM
以下是一个简单的示例代码:
```c
#include "stm32f4xx.h"
void TIM_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
// 使能TIM时钟和GPIO时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// 配置GPIO引脚为复用功能
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置GPIO复用映射
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_TIM2);
// 配置TIM基本参数
TIM_TimeBaseStructure.TIM_Period = 999; // PWM周期为1000个计数器时钟周期
TIM_TimeBaseStructure.TIM_Prescaler = 83; // 计数器时钟频率为84MHz/84=1MHz
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
// 配置TIM为PWM模式
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 500; // 初始占空比为50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
// 启动TIM
TIM_Cmd(TIM2, ENABLE);
}
int main(void)
{
TIM_Config();
while (1) {
// do something
}
}
```
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