stm32定时器1应用
时间: 2024-01-21 09:03:54 浏览: 81
STM32定时器1是一个非常通用的定时器,它可以用于多种应用,包括计时、PWM输出、输入捕获等等。下面我将为你介绍一些常见的应用方法。
1. 计时器模式
在计时器模式下,定时器1可以用来计时。你可以通过配置定时器的预分频和计数值来设置定时器的计时时间。当定时时间到达后,定时器会触发中断,你可以在中断中进行相应的处理。
下面是一个使用定时器1进行计时的示例代码:
```
#include "stm32f10x.h"
void TIM1_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)
{
// 定时器中断处理代码
TIM_ClearITPendingBit(TIM1, TIM_IT_Update);
}
}
void TIM1_Init(uint16_t arr, uint16_t psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructure.TIM_Period = arr - 1;
TIM_TimeBaseStructure.TIM_Prescaler = psc - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
TIM_Cmd(TIM1, ENABLE);
}
int main(void)
{
TIM1_Init(1000, 7200);
while (1)
{
// 主程序
}
}
```
在上面的代码中,我们使用了STM32的库函数来初始化定时器1,并在中断处理函数中进行相应的处理。
2. PWM输出模式
在PWM输出模式下,定时器1可以用来生成PWM波形。你可以通过配置定时器的预分频、计数值和占空比来生成不同的PWM波形。
下面是一个使用定时器1进行PWM输出的示例代码:
```
#include "stm32f10x.h"
void TIM1_PWM_Init(uint16_t arr, uint16_t psc, uint16_t pulse)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructure.TIM_Period = arr - 1;
TIM_TimeBaseStructure.TIM_Prescaler = psc - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable;
TIM_OCInitStructure.TIM_Pulse = pulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_Cmd(TIM1, ENABLE);
TIM_CtrlPWMOutputs(TIM1, ENABLE);
}
int main(void)
{
TIM1_PWM_Init(1000, 72, 500);
while (1)
{
// 主程序
}
}
```
在上面的代码中,我们使用了STM32的库函数来初始化定时器1,并配置了PWM输出模式。我们使用了TIM_OC1Init函数来配置定时器1的通道1,并设置了占空比为50%。
3. 输入捕获模式
在输入捕获模式下,定时器1可以用来捕获外部输入的信号。你可以通过配置定时器的预分频、计数值和捕获模式来捕获不同的信号。
下面是一个使用定时器1进行输入捕获的示例代码:
```
#include "stm32f10x.h"
void TIM1_IC_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_ICInit(TIM1, &TIM_ICInitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);
TIM_Cmd(TIM1, ENABLE);
}
void TIM1_CC_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_CC1) != RESET)
{
// 输入捕获中断处理代码
TIM_ClearITPendingBit(TIM1, TIM_IT_CC1);
}
}
int main(void)
{
TIM1_IC_Init();
while (1)
{
// 主程序
}
}
```
在上面的代码中,我们使用了STM32的库函数来初始化定时器1,并配置了输入捕获模式。我们使用了TIM_ICInit函数来配置定时器1的通道1,并设置了捕获时间为上升沿。当定时器捕获到信号时,会触发中断,你可以在中断中进行相应的处理。
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