/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"
#include "stdio.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
u8 USART2_Counter=0;
u8 USART2_Send_Flage=0;
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void); /* 系统时钟设置 */
void GPIO_Configuration(void); /* 端口设置 */
void NVIC_Configuration(void); /* NVIC中断向量设置 */
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name : main
* Description : Main program
* Input : None
* Output : None
* Return : None
*******************************************************************************/
int main(void)
{
/* 系统时钟设置 */
RCC_Configuration();
/* NVIC中断向量设置 */
NVIC_Configuration();
/* 端口设置 */
GPIO_Configuration();
/*系统时钟设置 HCLK=36MKZ，SysTick=4.5MKZ，Reload=49500，每11ms 产生一个中断，开系统时钟中断*/
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
SysTick_SetReload(49500);
SysTick_ITConfig(ENABLE);
SysTick_CounterCmd(SysTick_Counter_Enable);
while(1)
{
if(USART2_Send_Flage==1)
{
GPIO_WriteBit(GPIOA, GPIO_Pin_0,(BitAction)~GPIO_ReadOutputDataBit(GPIOA, GPIO_Pin_0));
USART2_Send_Flage=0;
}
}
}
/*******************************************************************************
* Function Name : RCC_Configuration
* Description : 配置不同的系统时钟.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
/* 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)
{
/* HCLK = SYSCLK =36MHZ*/
RCC_HCLKConfig(RCC_SYSCLK_Div1);
/* PCLK2 = HCLK=36MHZ */
RCC_PCLK2Config(RCC_HCLK_Div1);
/* PCLK1 = HCLK/2 =18MHZ*/
RCC_PCLK1Config(RCC_HCLK_Div2);
/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
/*系统时钟36MK PLLCLK = 4MHz * 9 = 36MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div2, 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)
{
}
}
/* 开 GPIOA时钟 36MHZ*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
}
/*******************************************************************************
* Function Name : GPIO_Configuration
* Description : 配置不同的GPIO引脚.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/*******************************************************************************
* Function Name : NVIC_Configuration
* Description : Configures Vector Table base location.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void NVIC_Configuration(void)
{
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
}
#ifdef DEBUG
/*******************************************************************************
* Function Name : assert_failed
* Description : Reports the name of the source file and the source line number
* where the assert error has occurred.
* Input : - file: pointer to the source file name
* - line: assert 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
", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
中断处理/*******************************************************************************
* Function Name : SysTickHandler
* Description : This function handles SysTick Handler.
* Input : None
* Output : None
* Return : None
*******************************************************************************/
void SysTickHandler(void)
{
extern u8 USART2_Counter;
extern u8 USART2_Send_Flage;
USART2_Counter++;
if(USART2_Counter==300) // 系统时钟每11ms产生一个中断，则3.3s则产生300次中断。3.3s GPIOA的引脚翻转一次，所接的LCD指示灯应该闪烁一次。
{
USART2_Send_Flage=1;
USART2_Counter=0;
}
}
但是我所设置的指示灯一直都没有亮过，我把设置GPIO翻转写在中断里也是同样的情况，我怀疑没有进入系统时钟中断。我主要的目的是实现用系统时钟定时，指示灯只是一个测试的单元。
为什么会出现这种情况，请高手指点！！谢谢！！ |
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