stm32：简单按键输入实现

开发环境keil4，芯片STM32F103C8T6

1、main.c

//串口实验
#include "sys.h"
#include "delay.h"
#include "key.h"
#define DC12VDO_ON()         GPIO_SetBits   (GPIOC, GPIO_Pin_13)
#define DC12VDO_OFF()        GPIO_ResetBits (GPIOC, GPIO_Pin_13)

 int    Index1,Index2,Index3 = ;
 int        time1;
unsigned char      gUart_Rece_Buf1[];
unsigned char      gUart_Rece_Buf2[];
unsigned char      gUart_Rece_Buf3[];
int i,j=;
u8 key;
 int main(void)
{
    delay_init();             //延时函数初始化
  sys_Init();        //系统初始化（时钟初始化、中断初始化、GPIOx初始化、串口1初始化、串口2初始化、串口3初始化）
    while()
    {
        DC12VDO_OFF();//led常亮
        key=KEY_Scan();
        if(key==)
        {
            DC12VDO_ON();//灭led
            delay_ms();//等待
        }
    }
}

2、key.c

#include "key.h"
#include "delay.h"
#include "sys.h"
uint8_t K1_Value;
u8 KEY_Scan(void)
{
        if(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0))
       {
          delay_ms(); //防抖
          if(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0))
          {
                        K1_Value=;
                        while(!GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_0));
                        }
           }
            else     K1_Value=;
            return K1_Value;
}

3、delay.c

#include "delay.h"
#include "sys.h"
//////////////////////////////////////////////////////////////////////////////////      

static u8  fac_us=;//us延时倍乘数
static u16 fac_ms=;//ms延时倍乘数

void delay_init()

{

    SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);    //选择外部时钟  HCLK/8
    fac_us=SystemCoreClock/;                //为系统时钟的1/8
    fac_ms=(u16)fac_us*;                    //非OS下,代表每个ms需要的systick时钟数     

}

void delay_us(u32 nus)
{
    u32 temp;
    SysTick->LOAD=nus*fac_us;                     //时间加载
    SysTick->VAL=0x00;                            //清空计数器
    SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;    //开始倒数
    do
    {
        temp=SysTick->CTRL;
    }while((temp&0x01)&&!(temp&(<<)));        //等待时间到达
    SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;    //关闭计数器
    SysTick->VAL =0X00;                           //清空计数器
}

void delay_ms(u16 nms)
{
    u32 temp;
    SysTick->LOAD=(u32)nms*fac_ms;                //时间加载(SysTick->LOAD为24bit)
    SysTick->VAL =0x00;                            //清空计数器
    SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;    //开始倒数
    do
    {
        temp=SysTick->CTRL;
    }while((temp&0x01)&&!(temp&(<<)));        //等待时间到达
    SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;    //关闭计数器
    SysTick->VAL =0X00;                           //清空计数器
} 

4、sys.c

#include "sys.h"

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
  ErrorStatus HSEStartUpStatus;//HSEStartUpStatus是枚举函数的参数，两个参数ERROR = 0, SUCCESS = !ERROR
/* Setup the microcontroller system. Initialize the Embedded Flash Interface,
   initialize the PLL and update the SystemFrequency variable. */
  //SystemInit();

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

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);    

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

  if(HSEStartUpStatus == SUCCESS)
  {

    /* 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 GPIOx clock */
  RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOC , ENABLE );
  RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB , ENABLE );
  RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA , ENABLE );
  RCC_APB2PeriphClockCmd( RCC_APB2Periph_AFIO  , ENABLE );

  /* Enable USART1&2 clocks */
  // Enable GPIOA clock
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,  ENABLE  );
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE  );
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE  );

  /* Enable USART3 clocks */
  // Enable GPIOB clock
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,  ENABLE  );
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE  );
}

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

      //--------------------------->PB0
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  //-------------------------USART1_TX-->PA9 , USART1_RX-->PA10
  /* Configure USART1_Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART1_Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  //-------------------------USART2_TX-->PA2 , USART2_RX-->PA3
  /* Configure USART2_Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Configure USART2_Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  //-------------------------USART3_TX-->PB10 , USART3_RX-->PB11
  /* Configure USART3_Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  /* Configure USART3_Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOB, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
#define  VECT_TAB_FLASH
//#define  VECT_TAB_FLASH_IAP
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

#if defined (VECT_TAB_RAM)
  /* Set the Vector Table base location at 0x20000000 */
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#elif defined(VECT_TAB_FLASH_IAP)
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x18000);
    __set_FAULTMASK();//开放总中断
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
  //__set_FAULTMASK(0);//开放总中断
#endif 

  /* Configure the NVIC Preemption Priority Bits */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

  /* Enable the USART1 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  /* Enable the USART2 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
    /* Enable the USART3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/*******************************************************************************
* Function Name  : USART1_Configuration
* Description    : Configures USART1.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void USART1_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;

  /* USART1 configuration ------------------------------------------------------*/
  /*
     USART1 configured as follow:
        - BaudRate = 9600 baud
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = ;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No ;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  //USART_InitStructure.USART_Mode = USART_Mode_Rx;

  /* Configure the USART1 */
  USART_Init(USART1, &USART_InitStructure);

  /* Enable USART1 Receive interrupt */
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);

  /* 如下语句解决第1个字节无法正确发送出去的问题 */
  USART_ClearFlag(USART1, USART_FLAG_TC);             // 清标志
}

/*******************************************************************************
* Function Name  : USART2_Configuration
* Description    : Configures USART2.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void USART2_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;

  /* USART2 configuration ------------------------------------------------------*/
  /*
     USART2 configured as follow:
        - BaudRate = 9600 baud
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = ;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No ;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  //USART_InitStructure.USART_Mode = USART_Mode_Rx;

  /* Configure the USART2 */
  USART_Init(USART2, &USART_InitStructure);

  /* Enable USART2 Receive interrupt */
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

  /* Enable the USART2 */
  USART_Cmd(USART2, ENABLE);

  /* 如下语句解决第1个字节无法正确发送出去的问题 */
  USART_ClearFlag(USART2, USART_FLAG_TC);             // 清标志
}

/*******************************************************************************
* Function Name  : USART3_Configuration
* Description    : Configures USART3.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void USART3_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;

  /* USART3 configuration ------------------------------------------------------*/
  /*
     USART3 configured as follow:
        - BaudRate = 9600 baud
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = ;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  //USART_InitStructure.USART_Mode = USART_Mode_Rx;

  /* Configure the USART3 */
  USART_Init(USART3, &USART_InitStructure);

  /* Enable USART3 Receive interrupt */
  USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

  /* Enable the USART3 */
  USART_Cmd(USART3, ENABLE);

  /* 如下语句解决第1个字节无法正确发送出去的问题 */
  USART_ClearFlag(USART3, USART_FLAG_TC);             // 清标志
}

//BSP初始化函数
void sys_Init(void)
{
    RCC_Configuration();
    NVIC_Configuration();
    GPIO_Configuration();
    USART1_Configuration();
  USART2_Configuration();
    USART3_Configuration();
}

#ifdef  DEBUG
/*******************************************************************************
* 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 assert_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 %d\r\n", file, line) */

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

/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/