stm32F1系列 程序源碼如下
#include "timer.h"
#include "led.h"
#include "usart.h"
void TIM3_Int_Init(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); //時鐘使能
TIM_TimeBaseStructure.TIM_Period = arr; //設置在下一個更新事件裝入活動的自動重裝載寄存器周期的值 計數到5000為500ms
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設置用來作為TIMx時鐘頻率除數的預分頻值 10Khz的計數頻率
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
TIM_ITConfig( //使能或者失能指定的TIM中斷
TIM3, //TIM2
TIM_IT_Update | //TIM 中斷源
TIM_IT_Trigger, //TIM 觸發中斷源
ENABLE //使能
);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; //TIM3中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //先占優先級0級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //從優先級3級
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根據NVIC_InitStruct中指定的參數初始化外設NVIC寄存器
TIM_Cmd(TIM3, ENABLE); //使能TIMx外設
}
void TIM3_IRQHandler(void) //TIM3中斷
{
if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET) //檢查指定的TIM中斷發生與否:TIM 中斷源
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update ); //清除TIMx的中斷待處理位:TIM 中斷源
LED1=!LED1;
}
}
//PWM輸出初始化
//arr：自動重裝值
//psc：時鐘預分頻數
void TIM3_PWM_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //使能GPIO外設和AFIO復用功能模塊時鐘使能
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); //Timer3部分重映射 TIM3_CH2->PB5 //用于TIM3的CH2輸出的PWM通過該LED顯示
//設置該引腳為復用輸出功能,輸出TIM3 CH2的PWM脈沖波形
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //復用推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//GPIO_WriteBit(GPIOA, GPIO_Pin_7,Bit_SET); // PA7上拉
TIM_TimeBaseStructure.TIM_Period = arr; //設置在下一個更新事件裝入活動的自動重裝載寄存器周期的值 80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //設置用來作為TIMx時鐘頻率除數的預分頻值 不分頻
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //設置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //選擇定時器模式:TIM脈沖寬度調制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比較輸出使能
TIM_OCInitStructure.TIM_Pulse = 0; //設置待裝入捕獲比較寄存器的脈沖值
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //輸出極性:TIM輸出比較極性高
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //根據TIM_OCInitStruct中指定的參數初始化外設TIMx
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); //使能TIMx在CCR2上的預裝載寄存器
TIM_ARRPreloadConfig(TIM3, ENABLE); //使能TIMx在ARR上的預裝載寄存器
TIM_Cmd(TIM3, ENABLE); //使能TIMx外設
}
//定時器5通道1輸入捕獲配置
TIM_ICInitTypeDef TIM5_ICInitStructure;
void TIM5_Cap_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //使能TIM5時鐘
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能GPIOA時鐘
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0 清除之前設置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //PA0 輸入
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_ResetBits(GPIOA,GPIO_Pin_0); //PA0 下拉
//初始化定時器5 TIM5
TIM_TimeBaseStructure.TIM_Period = arr; //設定計數器自動重裝值
TIM_TimeBaseStructure.TIM_Prescaler =psc; //預分頻器
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
//初始化TIM5輸入捕獲參數
TIM5_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 選擇輸入端 IC1映射到TI1上
TIM5_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; //上升沿捕獲
TIM5_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM5_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置輸入分頻,不分頻
TIM5_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置輸入濾波器 不濾波
TIM_ICInit(TIM5, &TIM5_ICInitStructure);
//中斷分組初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM3中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占優先級2級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //從優先級0級
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道被使能
NVIC_Init(&NVIC_InitStructure); //根據NVIC_InitStruct中指定的參數初始化外設NVIC寄存器
TIM_ITConfig(TIM5,TIM_IT_Update|TIM_IT_CC1,ENABLE);//允許更新中斷 ,允許CC1IE捕獲中斷
TIM_Cmd(TIM5,ENABLE ); //使能定時器5
}
u8 TIM5CH1_CAPTURE_STA=0; //輸入捕獲狀態
u16 TIM5CH1_CAPTURE_VAL; //輸入捕獲值
//定時器5中斷服務程序
void TIM5_IRQHandler(void)
{
if((TIM5CH1_CAPTURE_STA&0X80)==0)//還未成功捕獲
{
if (TIM_GetITStatus(TIM5, TIM_IT_Update) != RESET)
{
if(TIM5CH1_CAPTURE_STA&0X40)//已經捕獲到高電平了
{
if((TIM5CH1_CAPTURE_STA&0X3F)==0X3F)//高電平太長了
{
TIM5CH1_CAPTURE_STA|=0X80;//標記成功捕獲了一次
TIM5CH1_CAPTURE_VAL=0XFFFF;
}else TIM5CH1_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM5, TIM_IT_CC1) != RESET)//捕獲1發生捕獲事件
{
if(TIM5CH1_CAPTURE_STA&0X40) //捕獲到一個下降沿
{
TIM5CH1_CAPTURE_STA|=0X80; //標記成功捕獲到一次高電平脈寬
TIM5CH1_CAPTURE_VAL=TIM_GetCapture1(TIM5);
TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Rising); //CC1P=0 設置為上升沿捕獲
}else //還未開始,第一次捕獲上升沿
{
TIM5CH1_CAPTURE_STA=0; //清空
TIM5CH1_CAPTURE_VAL=0;
TIM_SetCounter(TIM5,0);
TIM5CH1_CAPTURE_STA|=0X40; //標記捕獲到了上升沿
TIM_OC1PolarityConfig(TIM5,TIM_ICPolarity_Falling); //CC1P=1 設置為下降沿捕獲
}
}
}
TIM_ClearITPendingBit(TIM5, TIM_IT_CC1|TIM_IT_Update); //清除中斷標志位
}
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輸入捕獲實驗.7z
(187.65 KB, 下載次數: 137)
2019-5-20 18:17 上傳
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