stm32f103 定时器5pwm输出
时间: 2023-11-13 18:03:13 浏览: 140
stm32f103 通过定时器的编码器模式对ab相脉冲进行分频后输出
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好的,针对您的问题,我可以给出以下代码示例:
```c
#include "stm32f10x.h"
void TIM5_PWM_Init(u32 arr, u32 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
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(TIM5, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM5, &TIM_OCInitStructure);
TIM_OC2Init(TIM5, &TIM_OCInitStructure);
TIM_OC3Init(TIM5, &TIM_OCInitStructure);
TIM_OC4Init(TIM5, &TIM_OCInitStructure);
TIM_Cmd(TIM5, ENABLE);
}
int main(void)
{
TIM5_PWM_Init(999, 71); // 72MHz / (71 + 1) / (999 + 1) = 100Hz
while (1)
{
TIM_SetCompare1(TIM5, 500); // PA0
TIM_SetCompare2(TIM5, 250); // PA1
TIM_SetCompare3(TIM5, 750); // PA2
TIM_SetCompare4(TIM5, 125); // PA3
}
}
```
这段代码实现了定时器5的PWM输出,使用了PA0~PA3四个引脚作为输出口。在`TIM5_PWM_Init`函数中,我们首先开启了TIM5和GPIOA的时钟,然后配置了PA0~PA3四个引脚为复用推挽输出模式。接着,我们配置了TIM5的基本参数,包括计数器的自动重装载值和预分频系数,以及计数器的计数模式。最后,我们配置了TIM5的四个通道为PWM输出模式,并使能了TIM5。
在主函数中,我们不断地修改TIM5的四个通道的占空比,以实现PWM输出。
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