STM32 v3.5固件库systick ms延时

来源：互联网发布：打鼓谱软件编辑：程序博客网时间：2024/06/04 17:49

http://yaoohui.blog.163.com/blog/static/173794970201231110648251/

《如何从STM32F10xxx固件库V2.0.3升级为STM32F10xxx标准外设库V3.0.0》一文中的“3.3.2 SysTick”讲到：

在标准外设库中移除了SysTick的驱动，因此用户必须调用CMSIS定义的函数。

CMSIS只提供了一个SysTick设置的函数，替代了STM32原有SysTick驱动的全部函数。

SysTick_Config(uint32_t ticks);

该函数设置了自动重载入计数器(LOAD)的值，SysTick IRQ的优先级，复位了计数器(VAL)的值，开始计数并打开SysTick IRQ中断。SysTick时钟默认使用系统时钟。

下面的例程为使用固件库V2.0.3进行SysTick设置：

/* Select the HCLK Clock as SysTick clock source (72MHz) */

SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK);

/* SysTick end of count event each 1ms with input clock equal to 72MHz (HCLK) */

SysTick_SetReload(72000);

/* Enable SysTick interrupt */

SysTick_ITConfig(ENABLE);

下面的例程为使用标准外设库V3.0.0进行SysTick设置：

/* Setup SysTick Timer for 1 msec interrupts */

if (SysTick_Config(SystemFrequency / 1000)) /* SystemFrequency is defined in “system_stm32f10x.h” and equal to HCLK frequency */

{

/* Capture error */

while (1);

}

2.0库函数延时代码

/*初始化时钟*/
void Init_SysTick(void){  /* Disable SysTick Counter */  SysTick_CounterCmd(SysTick_Counter_Disable);    /* Disable the SysTick Interrupt */  SysTick_ITConfig(DISABLE);    /* Configure HCLK clock as SysTick clock source */  SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);    /* SysTick interrupt each 1000 Hz with HCLK equal to 72MHz */  SysTick_SetReload(9000);    /* Enable the SysTick Interrupt */  SysTick_ITConfig(ENABLE);}
/*延时1ms函数*/__IO uint32_t TimingDelay;
void delay_ms(__IO uint32_t nTime){  /* Enable the SysTick Counter */  SysTick_CounterCmd(SysTick_Counter_Enable);    TimingDelay = nTime;    while(TimingDelay != 0);    /* Disable SysTick Counter */  SysTick_CounterCmd(SysTick_Counter_Disable);    /* Clear SysTick Counter */  SysTick_CounterCmd(SysTick_Counter_Clear);}
/*stm32f10x_it.c中的void SysTick_Handler(void)函数改为*/extern __IO uint32_t TimingDelay;
void SysTick_Handler(void){  if (TimingDelay != 0x00)  {     TimingDelay--;  }}
/*用法，延时1秒*/delay_ms(1000);

3.5库函数延时代码

/*初始化时钟*/
void Init_SysTick(void){  if(SysTick_Config(SystemCoreClock / 1000)) //注意：3.5库中 SystemFrequency 被 SystemCoreClock 取代。  while(1);}
/*延时1ms函数*/
__IO uint32_t TimingDelay;
void delay_ms(__IO uint32_t nTime){  TimingDelay = nTime;  while(TimingDelay != 0);}
/*stm32f10x_it.c中的void SysTick_Handler(void)函数改为*/
extern __IO uint32_t TimingDelay;
void SysTick_Handler(void){  if (TimingDelay != 0x00)  {     TimingDelay--;  }}
/*用法，延时1秒*/
delay_ms(1000);