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EEPW首頁(yè) > 嵌入式系統 > 設計應用 > STM32F051R8T6的通用定時(shí)器配置

STM32F051R8T6的通用定時(shí)器配置

作者: 時(shí)間:2016-11-10 來(lái)源:網(wǎng)絡(luò ) 收藏
將系統時(shí)鐘24分頻,計數頻率為48MHz/24 = 2MHz,則計一個(gè)數的時(shí)間為0.5us。計滿(mǎn)1000個(gè)數的時(shí)間為0.5ms。這就是TIM3的定時(shí)周期。

void TIM3_Configuration(void) //每0.5ms發(fā)生一次更新事件(進(jìn)入中斷服務(wù)程序).
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

TIM_DeInit(TIM3); //重新將Timer設置為缺省值
TIM_InternalClockConfig(TIM3); //采用內部時(shí)鐘給TIM3提供時(shí)鐘源
TIM_ARRPreloadConfig(TIM3, DISABLE); //禁止ARR預裝載緩沖器 預裝載寄存器的內容被立即傳送到影子寄存器

TIM_TimeBaseStructure.TIM_Prescaler = 24-1; //預分頻系數為24-1,這樣計數器計數頻率為48MHz/24 = 2MHz
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設置時(shí)鐘分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //設置計數器模式為向上計數模
TIM_TimeBaseStructure.TIM_Period = 1000; //設置計數溢出大小,每計1000個(gè)數就產(chǎn)生一個(gè)更新事件
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //將配置應用到TIM3中

TIM_ClearFlag(TIM3, TIM_FLAG_Update); //清除溢出中斷標志
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE); //使能TIM3的更新中斷
TIM_Cmd(TIM3, ENABLE); //開(kāi)啟定時(shí)器3

//Enable the TIM3 Interrupt
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

本文引用地址:http://dyxdggzs.com/article/201611/317513.htmstm32f0xx_it.c文件中

//---------------------------------0.5ms中斷一次---------------------------------------
void TIM3_IRQHandler(void)
{
if (TIM_GetITStatus(TIM3 TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
//添加代碼

}
}




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