一、RCC初始化
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/****************************************************************************
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* Function Name : RCC_Configuration
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* Description : Sets System clock frequency to 72MHz and configure HCLK, PCLK2
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* and PCLK1 prescalers.
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* Input : None
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* Output : None
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* Return : None
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****************************************************************************/
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void RCC_Configuration(void)
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{
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/* Deinitialize the RCC registers */
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RCC_DeInit();
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/* Enable the HSE */
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RCC_HSEConfig(RCC_HSE_ON);
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/* Wait till HSE is ready and if Time out is reached exit */
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HSEStartUpStatus = RCC_WaitForHSEStartUp();
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if(HSEStartUpStatus == SUCCESS)
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{
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/* Add here PLL ans system clock config */
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/* Enable The Prefetch Buffer */
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FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
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/* Configure Tthe Latency cycle: Set 0 Latency cycles */
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FLASH_SetLatency(FLASH_Latency_2);
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/* Configure HCLK such as HCLK = SYSCLK */
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RCC_HCLKConfig(RCC_SYSCLK_Div1);
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/* PCLK2 = HCLK */
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RCC_PCLK2Config(RCC_HCLK_Div1);
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/* PCLK1 = HCLK/2 */
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RCC_PCLK1Config(RCC_HCLK_Div2);
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/* Select HSE as system clock source*/
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RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
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/* PLLCLK = 8MHz * 9 = 72MHz */
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RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
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/* ADCCLK = PCLK/4 */
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RCC_ADCCLKConfig(RCC_PCLK2_Div4);
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/* Enable PLL */
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RCC_PLLCmd(ENABLE);
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/* Wait till PLL is ready */
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while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
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/* Select PLL as system clock source */
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RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* Wait till HSE is used as system clock source */
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while(RCC_GetSYSCLKSource() != 0x08)
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{
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}
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}
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else
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{
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/* If HSE fails to start-up. */
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while(1)
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{
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}
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}
- }
二、GPIO初始化
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/****************************************************************************
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* Function Name : GPIO_Configuration
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* Description :
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* Input : None
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* Output : None
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* Return : None
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****************************************************************************/
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void GPIO_Configuration(void)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
- }
三、NVIC初始化
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/****************************************************************************
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* Function Name : NVIC_Configuration
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* Description : Configures Vector Table base location.
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* Input : None
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* Output : None
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* Return : None
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****************************************************************************/
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void NVIC_Configuration(void)
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{
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NVIC_InitTypeDef NVIC_InitStructure;
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#ifdef VET_TAB_RAM
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/* Set the Vector Table base location at 0x2000 0000 */
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NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
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#else
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/* Set the Vector Table base location at 0x8000 0000 */
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NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
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#endif
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
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NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
- }
四、EXTI初始化
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/****************************************************************************
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* Function Name : EXTI_PE6_Config
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* Description :
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* Input : None
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* Output : None
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* Return : None
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****************************************************************************/
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void EXTI_PE6_Config(void)
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{
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GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource6);
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EXTI_InitStructure.EXTI_Line = EXTI_Line6;
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EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
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EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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EXTI_Init(&EXTI_InitStructure);
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EXTI_GenerateSWInterrupt(EXTI_Line6);
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- }
EXTI_GenerateSWInterrupt是触发一次软件中断。
同时需要编写中断函数在stm32f10x_it.c中:
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/*******************************************************************************
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* Function Name : EXTI9_5_IRQHandler
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* Description : This function handles External lines 9 to 5 interrupt request.
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void EXTI9_5_IRQHandler(void)
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{
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if(EXTI_GetITStatus(EXTI_Line6) != RESET)
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{
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GPIO_WriteBit(GPIOB, GPIO_Pin_8, (BitAction)(1-GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_8)));
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EXTI_ClearITPendingBit(EXTI_Line6);
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}
- }
五、main函数
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/****************************************************************************
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* Function Name : main
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* Description : Main program.
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* Input : None
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* Output : None
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* Return : None
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****************************************************************************/
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int main(void)
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{
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RCC_Configuration();
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NVIC_Configuration();
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GPIO_Configuration();
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EXTI_PE6_Config();
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while(1)
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{
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}
- }