STM32定時器及中斷簡單程式
阿新 • • 發佈:2019-01-23
STM32定時器及中斷簡單
//----------------------------main()--------------------
//stm32f103c8t6有3個普通1個高階定時器
//每次進入中斷服務程式間隔時間為
//((1+TIM_Prescaler )/72M)*(1+TIM_Period )=((1+7199)/72M)*(1+9999)=1秒
#include<stm32f10x.h>
#define D13_ON GPIO_ResetBits(GPIOC,GPIO_Pin_13)
#define D13_OFF GPIO_SetBits(GPIOC,GPIO_Pin_13)
void GPIO_Config(void);
void TIM2_Config(u16 arr,u16 psc);
void NVIC_Config(void);
//主函式
int main(void)
{
GPIO_Config();
//((1+arr )/72M)*(1+psc )=((1+1999)/72M)*(1+35999)=1秒
TIM2_Config(1999,35999);
NVIC_Config();
while(1);
}
//初始化GPIO
void GPIO_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
//PC13燈
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOC,&GPIO_InitStructure);
GPIO_ResetBits(GPIOC,GPIO_Pin_13); //關閉LED
}
//初始化TIM2定時器及中斷
//每次進入中斷服務程式間隔時間為
//((1+arr )/72M)*(1+psc )=((1+1999)/72M)*(1+35999)=1秒
void TIM2_Config(u16 arr,u16 psc)
{
//定時器時間是1s
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
//清除中斷標誌位
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);//TIM_ClearFlag(TIM2,TIM_FLAG_Update);//兩者作用相同
//自動裝載的週期值0-0xffff,72M/36000=2000
TIM_TimeBaseStructure.TIM_Period = arr;
//時鐘除數預分頻值0-oxffff,下面是36000分頻
TIM_TimeBaseStructure.TIM_Prescaler = psc;
////普通和高階才有下面兩行
//時鐘分割,暫時為0,高階應用才用
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
//計數模式,向上下,中央對齊123
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure);
//開啟中斷
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
//開啟外設
TIM_Cmd(TIM2,ENABLE);
}
//初始化中斷向量控制器NVIC
void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//--------------------stm32f10x_it.c------------------------
//中斷函式中自己編寫
void TIM2_IRQHandler(void)
{
//判斷TIM3更新中斷是否發生
if(TIM_GetITStatus(TIM2,TIM_IT_Update)!=RESET)
{
//必須清楚標誌位
TIM_ClearITPendingBit(TIM2,TIM_IT_Update);
//狀態取反
GPIO_WriteBit(GPIOC,GPIO_Pin_13,(BitAction)(!GPIO_ReadOutputDataBit(GPIOC,GPIO_Pin_13)));
}
}