STM32_GPIO配置及库函数讲解——独立按键

下面给出完整程序：

/* Includes */
#include"stm32f10x_lib.h"

/* Private function prototypes --*/
voidRCC_Configuration(void);
voidNVIC_Configuration(void);
voidGPIO_Configuration(void);
voidDelay(vu32 nCount);

/*******************************************************************************
* Function Name : main
* Description : Main program.
* Input : None
* Return : None
*******************************************************************************/
intmain(void)
{
#ifdefDEBUG
debug();
#endif

/* Configure the system clocks */
RCC_Configuration();

/* NVIC Configuration */
NVIC_Configuration();

/* Configure the GPIO ports */
GPIO_Configuration();

/* Infinite loop */
while(1)
{
if(GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_9)==0)//检测USR键是否被按下,若按下，则点亮全部LED
{
GPIO_SetBits(GPIOC,GPIO_Pin_6GPIO_Pin_7GPIO_Pin_8GPIO_Pin_9);
}
else
{
GPIO_ResetBits(GPIOC,GPIO_Pin_6GPIO_Pin_7GPIO_Pin_8GPIO_Pin_9);
}
}
}

/*******************************************************************************
* Function Name : RCC_Configuration
* Description : Configures the different system clocks.
* Input : None
* Return : None
*******************************************************************************/
voidRCC_Configuration(void)
{
ErrorStatusHSEStartUpStatus;

/* RCC system reset(for debug purpose) */
RCC_DeInit();

/* Enable HSE */
RCC_HSEConfig(RCC_HSE_ON);

/* Wait till HSE is ready */
HSEStartUpStatus=RCC_WaitForHSEStartUp();

if(HSEStartUpStatus==SUCCESS)
{
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);

/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1,RCC_PLLMul_9);

/* 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 PLL is used as system clock source */
while(RCC_GetSYSCLKSource()!=0x08){}
}

/* Enable GPIOC and GPIOB clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
}

/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Return : None
*******************************************************************************/
voidNVIC_Configuration(void)
{
#ifdefVECT_TAB_RAM
/* Set the Vector Table base location at 0x20 */
NVIC_SetVectorTable(NVIC_VectTab_RAM,0x0);
#else/* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH,0x0);
#endif
}

/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : Configures the different GPIO ports.
* Input : None
* Return : None
*******************************************************************************/
voidGPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Configure PC.06, PC.07, PC.08 and PC.09 as Output push-pull */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_6GPIO_Pin_7GPIO_Pin_8GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
GPIO_Init(GPIOC,&GPIO_InitStructure);

/* Configure PB.09 as Input pull-up */
GPIO_InitStructure.GPIO_Pin=GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU;//上拉输入
GPIO_Init(GPIOB,&GPIO_InitStructure);
}

/*******************************************************************************
* Function Name : Delay
* Description : Inserts a delay time.
* Input : nCount: specifies the delay time length.
* Return : None
*******************************************************************************/
voidDelay(vu32 nCount)
{
for(;nCount!=0;nCount--);
}

#ifdefDEBUG
/*******************************************************************************
* 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
* Return : None
*******************************************************************************/
voidassert_failed(u8*file,u32 line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %drn", file, line) */

/* Infinite loop */
while(1)
{
}
}
#endif