好吧,我不得不承认自己水平还不够,在第一个板子(金牛STM32F107VCT6)上跑了一个程序,但是没能成功,继续找原因吧。
接下来,我还是不死心,在另外一块板子(ALIENTEK STM32F103RBT6)上面写了一个使用SysTick定时的代码,结果运行成功,在这里分享出来,以作以后复习只用。
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Delay_SysTick.H
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
** 文件名称:Delay_SysTick.H
** 功能描述:系统滴答及其延时的使用声明
** 硬件平台:STM32F10x
** 编译环境:Keil uversion4 IDE
** 库版本 :v3.5.0
** 版本信息:v0.0
** 编写作者:
** 编写时间:2011-11-26
** 附加说明:无
** 修改记录:无
**/
#ifndef _DELAY_SYSTICK_H
#define _DELAY_SYSTICK_H
#include "stm32f10x.h"
/* Private function prototypes -----------------------------------------------*/
void SysTick_Configuration(void);
void SysTickDelay(__IO uint32_t nTime);
void TimingDelay_Decrement(void);
void SysTick_Handler(void);
#endif
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Delay_SysTick.C
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
** 文件名称:Delay_SysTick.C
** 功能描述:系统滴答及其延时的使用
** 硬件平台:STM32F10x
** 编译环境:Keil uversion4 IDE
** 库版本 :v3.5.0
** 版本信息:v0.0
** 编写作者:
** 编写时间:2011-11-26
** 附加说明:无
** 修改记录:2011-11-26 将TimingDelay数据类型改为volatile
**/
/* Includes ------------------------------------------------------------------*/
//#include "main.h"
#include "delay_systick.h"
#include "stm32f10x.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
volatile uint32_t TimingDelay;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/* Setup SysTick Timer for 1 msec interrupts.
------------------------------------------
1. The SysTick_Config() function is a CMSIS function which configure:
- The SysTick Reload register with value passed as function parameter.
- Configure the SysTick IRQ priority to the lowest value (0x0F).
- Reset the SysTick Counter register.
- Configure the SysTick Counter clock source to be Core Clock Source (HCLK).
- Enable the SysTick Interrupt.
- Start the SysTick Counter.
2. You can change the SysTick Clock source to be HCLK_Div8 by calling the
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8) just after the
SysTick_Config() function call. The SysTick_CLKSourceConfig() is defined
inside the misc.c file.
3. You can change the SysTick IRQ priority by calling the
NVIC_SetPriority(SysTick_IRQn,...) just after the SysTick_Config() function
call. The NVIC_SetPriority() is defined inside the core_cm3.h file.
4. To adjust the SysTick time base, use the following formula:
Reload Value = SysTick Counter Clock (Hz) x Desired Time base (s)
- Reload Value is the parameter to be passed for SysTick_Config() function
- Reload Value should not exceed 0xFFFFFF
*/
/**
* @brief Configure the SysTick clock.
* @param None
* @retval None
*/
void SysTick_Configuration(void)
{
/*SysTick clock source select*/
SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);
/*Initialize and start systick clock and its interrupt*/
if (SysTick_Config(SystemCoreClock / 1000))
{
/* Capture error */
while (1);
}
}
/**
* @brief Inserts a delay time.
* @param nTime: specifies the delay time length, in milliseconds.
* @retval None
*/
void SysTickDelay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
/**
* @brief Decrements the TimingDelay variable.
* @param None
* @retval None
*/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}
/**
* @brief This function handles SysTick Handler.
* @param None
* @retval None
*/
void SysTick_Handler(void)
{
TimingDelay_Decrement();
}
说明:本次没有直接对寄存器操作,因为是入门,所以没那么深入,先让板子跑起来再说吧,下面给出的参考资料中有对寄存器的讲解,很有价值,希望能帮上大家。
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