STM32——基本定时一秒闪烁LED.doc

STM32通用定时器的基本定时器功能实现灯闪烁 /* Includes -*/#include stm32f10x_lib.hErrorStatus HSEStartUpStatus;void RCC_Configuration(void);/void USART_Configuration(void);void GPIO_Configuration(void);void TIM_Configuration(void);void NVIC_Configuration(void);void delay(void);int main(void)#ifdef DEBUG debug();#endif RCC_Configuration(); GPIO_Configuration(); TIM_Configuration(); /USART_Configuration(); NVIC_Configuration(); /* Infinite loop */ while (1) if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) /* Function Name : assert_failed* Description : Reports the name of the source file and the source line number* where the assert_param error has occurred.* Input : - file: pointer to the source file name* - line: assert_param error line source number* Output : None* Return : None*/void RCC_Configuration(void) /*将外设RCC寄存器重设为缺省值 */ RCC_DeInit(); /*设置外部高速晶振（HSE）*/ RCC_HSEConfig(RCC_HSE_ON); /RCC_HSE_ONHSE晶振打开(ON) /*等待HSE起振*/ HSEStartUpStatus = RCC_WaitForHSEStartUp(); if(HSEStartUpStatus = SUCCESS) /SUCCESS：HSE晶振稳定且就绪 /*设置AHB时钟（HCLK）*/ RCC_HCLKConfig(RCC_SYSCLK_Div1); /RCC_SYSCLK_Div1AHB时钟 = 系统时钟 /* 设置高速AHB时钟（PCLK2）*/ RCC_PCLK2Config(RCC_HCLK_Div1); /RCC_HCLK_Div1APB2时钟 = HCLK /*设置低速AHB时钟（PCLK1）*/ RCC_PCLK1Config(RCC_HCLK_Div2); /RCC_HCLK_Div2APB1时钟 = HCLK / 2 /*设置FLASH存储器延时时钟周期数*/ FLASH_SetLatency(FLASH_Latency_2); /FLASH_Latency_2 2延时周期 /*选择FLASH预取指缓存的模式*/ FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); / 预取指缓存使能 /*设置PLL时钟源及倍频系数*/ RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);/ PLL的输入时钟 = HSE时钟频率；RCC_PLLMul_9PLL输入时钟x 9 /*使能PLL */ RCC_PLLCmd(ENABLE); /*检查指定的RCC标志位(PLL准备好标志)设置与否*/ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) = RESET) /*设置系统时钟（SYSCLK） */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);/RCC_SYSCLKSource_PLLCLK选择PLL作为系统时钟 /* PLL返回用作系统时钟的时钟源*/while(RCC_GetSYSCLKSource() != 0x08) /0x08：PLL作为系统时钟 /*使能TIM3的APB1外设时钟*/ RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); /*使能或者失能APB2外设时钟*/ RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOF , ENABLE); /RCC_APB2Periph_GPIOA GPIOA时钟 /RCC_APB2Periph_GPIOB GPIOB时钟 /RCC_APB2Periph_GPIOC GPIOC时钟 /RCC_APB2Periph_GPIOD GPIOD时钟/*void USART_Configuration(void) /串口初始化函数USART_InitTypeDef USART_InitStructure; /串口设置恢复默认参数USART_InitStructure.USART_BaudRate = 9600; /设置波特率=9600 USART_InitStructure.USART_WordLength = USART_WordLength_8b;/字长8位 USART_InitStructure.USART_StopBits = USART_StopBits_1;/ 1位停止字节 USART_InitStructure.USART_Parity = USART_Parity_No ; /无奇偶校验 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; /无流控制USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);/接收中断使能 USART_ITConfig(USART1,USART_IT_TXE,ENABLE);/发送中断使能 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; / 打开Rx接收和Tx发送功能 USART_Init(USART1, &USART_InitStructure); / 初始化串口 USART_Cmd(USART1, ENABLE);/启动串口 */void GPIO_Configuration(void)GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_6;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; /推挽输出GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; /推挽输出GPIO_Init(GPIOD, &GPIO_InitStructure);void TIM_Configuration(void) /*每1秒发生一次更新事件(进入中断服务程序)。 RCC_Configuration()的SystemInit()的RCC-CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2 表明TIM3CLK为72MHz。因此，每次进入中断服务程序间隔时间为 (1+TIM_Prescaler )/72M)*(1+TIM_Period )=(1+7199)/72M)*(1+9999)=1秒 */TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;TIM_DeInit( TIM2); TIM_TimeBaseStructure.TIM_Period =9999; / 自动重装载寄存器周期的值(定时时间) / 累计 0xFFFF个频率后产生个更新或者中断(也是说定时时间到)TIM_TimeBaseStructure.TIM_Prescaler = 7199;/时钟预分频数 例如 ：时钟频率=72/(时钟预分频+1)TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);/*此函数的语句TIMx-EGR = TIM_PSCReloadMode_Immediate;以软件方式产生更新事件(注:当发生一个更新事件时，所有的寄存器都被更新，硬件同时(依据URS位)设置更新标志位(TIMx_SR寄存器中的UIF位)。 */ /TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;/TIM_SetAutoreload(TIM2, 9999);TIM_ClearFlag(TIM2, TIM_FLAG_Update); / Clear TIM2 update pending flag清除TIM2溢出中断标志 TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE); / Enable TIM2 Update interrupt TIM2溢出中断允许TIM_Cmd(TIM2, ENABLE);/ TIM2 enable counter 允许tim2计数/*void EXTI_Configuration(void) /连接EXTI Line0到PA.00 GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); / 配置EXTI Line0产生一个下降沿中断 EXTI_InitStructure.EXTI_Line = EXTI_Line0; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); / 连接EXTI Line9到PB.09 GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource9); / 配置EXTI Line9产生一个下降沿中断 EXTI_InitStructure.EXTI_Line = EXTI_Line9; EXTI_Init(&EXTI_InitStructure); */void NVIC_Configuration(void) NVIC_InitTypeDef NVIC_InitStructure; #ifdef VECT_TAB_RAM /* Set the Vector Table base location at 0x20000000 矢量表设置在0x20000000基地位置 */ NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); #else /* VECT_TAB_FLASH */ /* Set the Vector Table base location at 0x08000000 矢量表设置在0x08000000基地位置 */ NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); #endif NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); /* Enable the TIM2 global Interrupt 全局中断使能TIM2 */ NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);void delay(void)u32 i,j;for (i=0; i0x0fffff; i+) j +;#ifdef DEBUGvoid assert_failed(u8* file, u32 line) /* 用户可以添加自己的执行情况报告的文件名和行号，例如：printf（“请值错误的参数：文件的行d 的R N”的，文件，行） */ /* Infinite loop */ wh