按键中断总结

来源：互联网发布：三星s7解网络锁工具编辑：程序博客网时间：2024/05/29 19:25

一、RCC初始化

/****************************************************************************
* Function Name : RCC_Configuration
* Description : Sets System clock frequency to 72MHz and configure HCLK, PCLK2
* and PCLK1 prescalers.
* Input : None
* Output : None
* Return : None
****************************************************************************/
void RCC_Configuration(void)
{
/* Deinitialize the RCC registers */
RCC_DeInit();
/* Enable the HSE */
RCC_HSEConfig(RCC_HSE_ON);
/* Wait till HSE is ready and if Time out is reached exit */
HSEStartUpStatus = RCC_WaitForHSEStartUp();
if(HSEStartUpStatus == SUCCESS)
{
/* Add here PLL ans system clock config */
/* Enable The Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/* Configure Tthe Latency cycle: Set 0 Latency cycles */
FLASH_SetLatency(FLASH_Latency_2);
/* Configure HCLK such as HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);
/* Select HSE as system clock source*/
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
/* PLLCLK = 8MHz * 9 = 72MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
/* ADCCLK = PCLK/4 */
RCC_ADCCLKConfig(RCC_PCLK2_Div4);
/* Enable PLL */
RCC_PLLCmd(ENABLE);
/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* Wait till HSE is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
}
else
{
/* If HSE fails to start-up. */
while(1)
{
}
}
}

相比之前的时钟初始化，多初始化了ADCCLK。

二、GPIO初始化

/****************************************************************************
* Function Name : GPIO_Configuration
* Description :
* Input : None
* Output : None
* Return : None
****************************************************************************/
void GPIO_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}

使用PB8作为推挽输出，PB6为浮空输入。

三、NVIC初始化

/****************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Output : None
* Return : None
****************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VET_TAB_RAM
/* Set the Vector Table base location at 0x2000 0000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else
/* Set the Vector Table base location at 0x8000 0000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

因位PB6位输入，也就是外部中断源。所以初始化EXTI9_5_IRQn作为外部中断源

四、EXTI初始化

/****************************************************************************
* Function Name : EXTI_PE6_Config
* Description :
* Input : None
* Output : None
* Return : None
****************************************************************************/
void EXTI_PE6_Config(void)
{
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource6);
EXTI_InitStructure.EXTI_Line = EXTI_Line6;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
EXTI_GenerateSWInterrupt(EXTI_Line6);
}

设置了外部中断源，把GPIOB6作为中断源。外部中断线是6，结合原理图使用下降沿触发。
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：

/*******************************************************************************
* Function Name : EXTI9_5_IRQHandler
* Description : This function handles External lines 9 to 5 interrupt request.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line6) != RESET)
{
GPIO_WriteBit(GPIOB, GPIO_Pin_8, (BitAction)(1-GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_8)));
EXTI_ClearITPendingBit(EXTI_Line6);
}
}

五、main函数

/****************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Output : None
* Return : None
****************************************************************************/
int main(void)
{
RCC_Configuration();
NVIC_Configuration();
GPIO_Configuration();
EXTI_PE6_Config();
while(1)
{
}
}

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