stm32输出pwm波的程序
时间: 2023-10-08 21:14:16 浏览: 42
以下是使用STM32输出PWM波的基本程序:
```c
#include "stm32f4xx.h"
int main(void)
{
// Enable the clock for GPIOA and TIM2
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// Configure PA5 as alternate function mode
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStruct);
// Connect PA5 to TIM2 as alternate function
GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_TIM2);
// Configure TIM2
TIM_TimeBaseInitTypeDef TIM_InitStruct;
TIM_InitStruct.TIM_Period = 999; // Set the period to 1000 (1 kHz PWM frequency)
TIM_InitStruct.TIM_Prescaler = 83; // Set the prescaler to 84 (84 MHz / 84 = 1 MHz timer clock)
TIM_InitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_InitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_InitStruct);
// Configure TIM2 channel 1 for PWM output
TIM_OCInitTypeDef TIM_OCInitStruct;
TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStruct.TIM_Pulse = 500; // Set the pulse width to 500 (50% duty cycle)
TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStruct);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);
// Start TIM2
TIM_Cmd(TIM2, ENABLE);
while (1)
{
// Do nothing
}
}
```
这个程序配置了TIM2通道1作为PWM输出,并将其连接到了PA5引脚上。在此示例中,PWM频率为1kHz,占空比为50%。您可以根据需要更改这些参数。