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#include"stm32f10x_lib.h"
GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;
void NVIC_Configuration(void);
void RCC_Configuration(void);
void TIM2_Configuration(void);
void Delay(vu32 nCount);
int main(void)
{
#ifdef DEBUG
debug();/*[初始化外圍設備指針]*/
#endif
NVIC_Configuration();//初始化中斷嵌套
RCC_Configuration(); //初始化時鐘與復位
TIM2_Configuration();//初始化定時器
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin= GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8; //PB的5678接LED2345
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
TIM_SetCounter( TIM2, 0x0010);
TIM_SetAutoreload(TIM2, 0x0010);
TIM_ClearFlag(TIM2, TIM_FLAG_Update); /*清除更新標志位*/
TIM_ClearITPendingBit(TIM2, TIM_FLAG_Update); //清除TIM2等待中斷更新中斷標志位
TIM_ARRPreloadConfig(TIM2, ENABLE); /*預裝載寄存器的內(nèi)容被立即傳送到影子寄存器 */
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); //使能TIM2的更新
TIM_Cmd(TIM2, ENABLE);
while(1)
{
}
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
//NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); //配置優(yōu)先級組
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel; //設置TIM2通道輸入中斷
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; /* Configure the NVIC Preemption Priority Bits[配置優(yōu)先級組] */
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; /* Enable the TIM2 gloabal Interrupt [允許TIM2全局中斷]*/
NVIC_Init(&NVIC_InitStructure);
}
void TIM2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 0xffff; //設定的最大計數(shù)值7199，最大計數(shù)值是0xffff
TIM_TimeBaseStructure.TIM_Prescaler = 9999; //分頻9999
TIM_TimeBaseStructure.TIM_ClockDivision = 0; // 時鐘分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //計數(shù)方向向上計數(shù)
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_Cmd(TIM2, ENABLE); //TIM2 enable counter
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //在開啟時鐘里一定要打開TIM2的時鐘
}
void RCC_Configuration(void)
{
RCC_DeInit();
RCC_HSEConfig(RCC_HSE_ON);
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
FLASH_SetLatency(FLASH_Latency_2);
RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK2Config(RCC_HCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div2);
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
RCC_PLLCmd(ENABLE);
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
}
void Delay(vu32 nCount)
{
for(;nCount!=0;nCount--);
}
TIM2中斷服務程序：
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) == SET)
{
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
GPIO_SetBits(GPIOB,GPIO_Pin_5);
Delay(400000);
GPIO_ResetBits(GPIOB,GPIO_Pin_5);
GPIO_SetBits(GPIOB,GPIO_Pin_6);
Delay(400000);
GPIO_ResetBits(GPIOB,GPIO_Pin_6);
GPIO_SetBits(GPIOB,GPIO_Pin_7);
Delay(400000);
GPIO_ResetBits(GPIOB,GPIO_Pin_7);
GPIO_SetBits(GPIOB,GPIO_Pin_8);
Delay(400000);
GPIO_ResetBits(GPIOB,GPIO_Pin_8);
}
}
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