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本人小白一個
由于PIN44對應的引腳PC4沒有定時器，于是將PIN44和43連接起來了。使用43對應的引腳PA7,配置為上拉輸入，使用TIM8_CH1下降沿捕獲計數，求指點了哪里出問題了計數進不去timer.c文件
TIM_ICInitTypeDef TIM8_ICInitStructure;
void TIM8_Int_Init(u32 arr, u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM8, ENABLE); //使能TIM8時鐘
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); //使能GPIOC時鐘
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; //PC4 清除之前設置
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;//復用功能
// GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//推挽輸出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//上拉
GPIO_Init(GPIOC, &GPIO_InitStructure);
// GPIO_PinAFConfig(GPIOC,GPIO_PinSource4,GPIO_AF_TIM8);
//初始化定時器8 TIM8
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_RepetitionCounter = 0; //為0,溢出一次就進中斷一次，高級定時器必須設置
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
TIM_TimeBaseInit(TIM8, &TIM_TimeBaseStructure); //根據TIM_TimeBaseInitStruct中指定的參數初始化TIMx的時間基數單位
// TIM_ClearITPendingBit(TIM8,TIM_IT_Update); //清除中斷標志位，避免第一次自動進入中斷一次
// TIM_TIxExternalClockConfig( TIM8, TIM_TIxExternalCLK1Source_TI1,TIM_ICPolarity_Rising, 0xF );
//初始化TIM8輸入捕獲參數
TIM8_ICInitStructure.TIM_Channel = TIM_Channel_1; //CC1S=01 選擇輸入端 IC1映射到TI1上
TIM8_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; //下降沿捕獲
TIM8_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; //映射到TI1上
TIM8_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; //配置輸入分頻,不分頻
TIM8_ICInitStructure.TIM_ICFilter = 0x00;//IC1F=0000 配置輸入濾波器 不濾波
TIM_ICInit(TIM8, &TIM8_ICInitStructure);
//中斷分組初始化
NVIC_InitStructure.NVIC_IRQChannel = TIM8_UP_TIM13_IRQn; //TIM8中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //先占優(yōu)先級2級
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //從優(yōu)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(TIM8, TIM_IT_Update | TIM_IT_CC1, ENABLE); //允許更新中斷 ,允許CC1IE捕獲中斷
TIM_Cmd(TIM8, ENABLE ); //使能定時器2
}
u8 TIM8CH1_CAPTURE_STA = 0; //輸入捕獲狀態(tài)
u32 TIM8CH1_CAPTURE_VAL; //輸入捕獲值
u32 TIM8CH1_CAPTURE_STB = 0; //計數
//捕獲狀態(tài)
//[7]:0,沒有成功的捕獲;1,成功捕獲到一次.
//[6]:0,還沒捕獲到低電平;1,已經捕獲到低電平了.
//[5:0]:捕獲低電平后溢出的次數(對于 32 位定時器來說,1us 計數器加 1,溢出時間:4294 秒)
//定時器2中斷服務程序
void TIM8_UP_TIM13_IRQHandler(void)
{
if((TIM8CH1_CAPTURE_STA & 0X40) == 0) //還未成功捕獲
{
if (TIM_GetITStatus(TIM8, TIM_IT_Update) != RESET)
{
if(TIM8CH1_CAPTURE_STA & 0X80) //已經捕獲到低電平了
{
if((TIM8CH1_CAPTURE_STA & 0X3F) == 0X3F) //高電平太長了
{
TIM8CH1_CAPTURE_STA |= 0X40; //標記成功捕獲了一次
TIM8CH1_CAPTURE_VAL = 0XFFFFFFFF;
}
else TIM8CH1_CAPTURE_STA++;
}
}
if (TIM_GetITStatus(TIM8, TIM_IT_CC1) != RESET)//捕獲1發(fā)生捕獲事件
{
if(TIM8CH1_CAPTURE_STA & 0X80) //捕獲到一個上升沿
{
TIM8CH1_CAPTURE_STA |= 0X40; //標記成功捕獲到一次下降沿
TIM8CH1_CAPTURE_VAL = TIM_GetCapture1(TIM8); //獲取當前的捕獲值
TIM8CH1_CAPTURE_STB++;
TIM_OC1PolarityConfig(TIM8, TIM_ICPolarity_Falling); //CC1P=0 設置為下降沿捕獲
}
else //還未開始,第一次捕獲上升沿
{
TIM8CH1_CAPTURE_STA = 0; //清空
TIM8CH1_CAPTURE_VAL = 0;
TIM8CH1_CAPTURE_STA |= 0X80; //標記捕獲到了下降沿
TIM_Cmd(TIM8, DISABLE);
TIM_SetCounter(TIM8, 0);
TIM_OC1PolarityConfig(TIM8, TIM_ICPolarity_Rising); //CC1P=1 設置為上升沿捕獲
TIM_Cmd(TIM8, ENABLE);
}
}
}
TIM_ClearITPendingBit(TIM8, TIM_IT_CC1 | TIM_IT_Update); //清除中斷標志位
}
main
TIM8_Int_Init(10000-1,8400-1);
while(1){
if(TIM8CH1_CAPTURE_STA&0X40)//成功捕獲到了一次低電平
{
printf("count:%d \r\n",TIM8CH1_CAPTURE_STB);
TIM8CH1_CAPTURE_STA=0; //開啟下一次捕獲
}
delay_ms(1000);
}
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捕獲.PNG
(9.01 KB, 下載次數: 55)
下載附件
2022-3-25 13:41 上傳
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