stm32f103c8t6定时器1输出pwm代码
时间: 2024-05-27 21:06:54 浏览: 18
好的,以下是stm32f103c8t6定时器1输出PWM的代码示例:
```
#include "stm32f10x.h"
void TIM1_PWM_Init(uint16_t arr, uint16_t psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_Prescaler = psc;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = arr / 2;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);
TIM_Cmd(TIM1, ENABLE);
}
int main(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
uint16_t arr = 999; // 自动重装载值
uint16_t psc = 71; // 分频系数
TIM1_PWM_Init(arr, psc);
while (1)
{
// 程序运行中可以修改占空比
uint16_t pulse = 500; // 脉冲宽度
TIM_SetCompare1(TIM1, pulse);
delay_ms(1000);
pulse = 800; // 脉冲宽度
TIM_SetCompare1(TIM1, pulse);
delay_ms(1000);
}
}
```
以上代码实现了stm32f103c8t6定时器1输出PWM信号。通过调整占空比,可以控制PWM信号的脉冲宽度。具体实现方法是通过设置TIM1的ARR和PSC寄存器确定PWM信号的周期和频率,然后通过设置TIM1的CCR1寄存器来确定PWM信号的占空比。这里的代码设置了一个周期为1ms,频率为1kHz,占空比默认为50%。在程序运行中可以通过修改CCR1寄存器的值来改变PWM信号的占空比。
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