main.c

STM32 单片机例程

/******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
* File Name          : main.c
* Author             : MCD Application Team
* Version            : V2.0.1
* Date               : 06/13/2008
* Description        : Main program body.
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#define SYS_GLOBALS
#include "include.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
GPIO_InitTypeDef GPIO_InitStructure;
ErrorStatus HSEStartUpStatus;

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void NVIC_Configuration(void);
void GPIO_Configuration(void);
void USART1_InitConfig(uint32 BaudRate);
void testKEY(void);
/* Private functions ---------------------------------------------------------*/
/*----------------------------------------------------------------------------
  SendChar
  Write character to Serial Port.
 *----------------------------------------------------------------------------*/
int SendChar (int ch)  {

  while (!(USART1->SR & USART_FLAG_TXE));
  USART1->DR = (ch & 0x1FF);

  return (ch);
}


/*----------------------------------------------------------------------------
  GetKey
  Read character to Serial Port.
 *----------------------------------------------------------------------------*/
int GetKey (void)  {

  while (!(USART1->SR & USART_FLAG_RXNE));

  return ((int)(USART1->DR & 0x1FF));
}

/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif

  /* System Clocks Configuration */
  RCC_Configuration();//配置系统时钟   

  GPIO_Configuration();//配置GPIO
  

  /* NVIC configuration */
  NVIC_Configuration();//配置中断

  USART1_InitConfig(115200);

  
  printf ("Polling mode Serial I/O Example\r\n\r\n");

  while (1)
  {                                     // Loop forever
    //unsigned char c;

    printf ("Press a key. ");//提示从串口输入1个字符
    //c = getchar ();
    printf ("\r\n");
    //printf ("You pressed '%c'.\r\n\r\n", c);
	testKEY();
  } // end while
  
}

void USART1_InitConfig(uint32 BaudRate)
{USART_InitTypeDef USART_InitStructure;
  
  //使能串口的RCC时钟
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
  
  //串口使用的GPIO口配置
  /* Configure USART1 Rx (PA.10) as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  /* Configure USART1 Tx (PA.09) as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  //配置串口
  USART_InitStructure.USART_BaudRate = 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;

  /* Configure USART1 */
  USART_Init(USART1, &USART_InitStructure);//配置串口1

  /* Enable the USART1 */
  USART_Cmd(USART1, ENABLE);//使能串口1
}
/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{   
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);//使能外部时钟 

  /* Wait till HSE is ready */
  HSEStartUpStatus = RCC_WaitForHSEStartUp();//等待外部时钟就绪

  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)
    {
    }
  }

}

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the different GPIO ports.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  
  /* Enable GPIO_LED clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);//使能GPIO时钟
  //LED_init-------------------------------------------------------

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);			 //设置GPIO为输出
  
  //按键输出
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIO_SetBits(GPIOC, GPIO_Pin_0);
  GPIO_SetBits(GPIOC, GPIO_Pin_1);
  GPIO_SetBits(GPIOC, GPIO_Pin_2);
  GPIO_SetBits(GPIOC, GPIO_Pin_3);
  
  //按键输入
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//lzt;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIO_SetBits(GPIOC, GPIO_Pin_4);
  GPIO_SetBits(GPIOC, GPIO_Pin_5);
  GPIO_SetBits(GPIOC, GPIO_Pin_6);
  GPIO_SetBits(GPIOC, GPIO_Pin_7);
  
  //蜂鸣器输出
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//lzt;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  
  GPIO_ResetBits(GPIOC, GPIO_Pin_13);
}

/*******************************************************************************
* Function Name  : NVIC_Configuration
* Description    : Configures Vector Table base location.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void NVIC_Configuration(void)
{

//#ifdef  VECT_TAB_RAM
#if defined (VECT_TAB_RAM)
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); //设置中断向量在RAM中
//#elif defined(VECT_TAB_FLASH_IAP)
//  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x2000);
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0); //设置中断向量在FLASH中  
#endif


}

void delay(uint32 time)
{uint32 i, j;
   
   for(i=0; i<time; i++)
   {
      for(j=0; j<14000; j++);
   }
}

void testKEY(void)
{
int i;
int x,y;
char buf[32];
char c;
char old_keydownflag=0;
 
  
  x=0;y=0;
  while (1)
  {

	 PC4=0;  PC5=0;  PC6=0;  PC7=0;
	 if(PC0in==0 || PC1in==0 || PC2in==0 || PC3in==0)
	 {
	  delay(100);//消抖
		if(PC0in==0 || PC1in==0 || PC2in==0 || PC3in==0)
		{
		   for(i=0;i<4;i++)
		   {
		      if(i==0)
		      {
		         PC4=0;  PC5=1;  PC6=1;  PC7=1;
		      }
		      else if(i==1)
		      {
		         PC4=1;  PC5=0;  PC6=1;  PC7=1;
		      }
		      else if(i==2)
		      {
		         PC4=1;  PC5=1;  PC6=0;  PC7=1;
		      }
		      else// if(i==3)
		      {
		         PC4=1;  PC5=1;  PC6=1;  PC7=0;
		      }
		      if(PC0in==0)
		      {
		         x=0,y=i;
		         break;
		      }
		      else if(PC1in==0)
		      {
		         x=1,y=i;
		         break;
		      }
		      else if(PC2in==0)
		      {
		         x=2,y=i;
		         break;
		      }
		      else if(PC3in==0)
		      {
		         x=3,y=i;
		         break;
		      }
		      else
		         x=4,y=4;
		   }
		   
		   
		   if(x<4)
		   {
		      PC13=1;
		      if(old_keydownflag==1)
		         continue;
		      old_keydownflag=1;

			    //sprintf(buf,"\r\n key=%d",y*4+x+1);
		      //SendMulChar1(buf);
		      printf ("You pressed '%c'.\r\n\r\n", y*4+x+1);
		   }
		}
	 }
	 else
	 {
	    old_keydownflag=0;
		  PC13=0;
	 }
  }
  
}


#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 (1)
  {
  }
}
#endif

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