< SysTick CTRL: COUNTFLAG Position */ #define SysTick_CTRL_COUNTFLAG_Msk (1ul << SysTick_CTRL_COUNTFLAG_Pos) /*!< SysTick CTRL: COUNTFLAG Mask */ #define SysTick_CTRL_CLKSOURCE_Pos 2 /*!< SysTick CTRL: CLKSOURCE Position */ #define SysTick_CTRL_CLKSOURCE_Msk (1ul << SysTick_CTRL...
#include "stm32f4xx.h" // 读取 SysTick 中断标志位状态 uint32_t SysTick_GetFlagStatus(void) { return (SysTick->CTRL & SysTick_CTRL_COUNTFLAG_Msk) != 0; } // 清除 SysTick 中断标志位 void SysTick_ClearFlag(void) { // 读取 STK_CSR 寄存器以清除 COUNTFLAG 位 (void)SysTick...
SysTick->VAL = 0; /* Load the SysTick Counter Value */ // 这里的SysTick_CTRL_CLKSOURCE_Msk = 1 << 2,默认会将时钟配置为AHB时钟源72M SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_TICKINT_Msk | SysTick_CTRL_ENABLE_Msk; /* Enable SysTick IRQ and SysTick Timer */ ...
// 等待计数到0 while (!((SysTick->CTRL) & SysTick_CTRL_COUNTFLAG_Msk)); } // 关掉定时器 SysTick->CTRL &= ~(SysTick_CTRL_ENABLE_Msk); } 出自:https://blog.csdn.net/dingyc_ee/article/details/98480179
< SysTick CTRL: COUNTFLAG Position */ #defineSysTick_CTRL_COUNTFLAG_Msk (1ul << SysTick_CTRL_COUNTFLAG_Pos)/*!< SysTick CTRL: COUNTFLAG Mask */ #defineSysTick_CTRL_CLKSOURCE_Pos 2/*!< SysTick CTRL: CLKSOURCE Position */ #defineSysTick_CTRL_CLKSOURCE_Msk (1ul << SysTick_CTRL_...
#define SysTick_CTRL_COUNTFLAG_Msk (1ul << SysTick_CTRL_COUNTFLAG_Pos) /*!< SysTick CTRL: COUNTFLAG Mask */ 溢出标志位 #define SysTick_CTRL_CLKSOURCE_Pos 2 /*!< SysTick CTRL: CLKSOURCE Position */ #define SysTick_CTRL_CLKSOURCE_Msk (1ul << SysTick_CTRL_CLKSOURCE_Pos) ...
< SysTick CTRL: COUNTFLAG Position */ #define SysTick_CTRL_COUNTFLAG_Msk (1UL << SysTick_CTRL_COUNTFLAG_Pos) /*!< SysTick CTRL: COUNTFLAG Mask */ #define SysTick_CTRL_CLKSOURCE_Pos 2U /*!< SysTick CTRL: CLKSOURCE Position */
CTRL 从上往下,我们一一来讲解。首先是COUNTFLAG寄存器,主要的作用就是防止误读以及多读,在读完之后自动清零;之后是 CLKSOURCE寄存器,主要用来选择时钟源,使用SysTick_CLKSourceConfig();再后面就是TICKINT寄存器,主要功能就是选择是否再倒计时结束后产生中断;最后就是ENABLE寄存器,使能位,应该比较好理解。
< SysTick CTRL: COUNTFLAG Position */#define SysTick_CTRL_COUNTFLAG_Msk (1ul << SysTick_CT...
/* SysTick Control / Status Register Definitions */#defineSysTick_CTRL_COUNTFLAG_Pos 16/*!< SysTick CTRL: COUNTFLAG Position */#defineSysTick_CTRL_COUNTFLAG_Msk (1ul <#defineSysTick_CTRL_CLKSOURCE_Pos 2/*!< SysTick CTRL: CLKSOURCE Position */#defineSysTick_CTRL_CLKSOURCE_Msk (1ul <#def...