stm32定时器延时时间（STM32 timer delay time）.doc

stm32定时器延时时间（STM32 timer delay time） STM32, systick specific delay time calculation Categories: STM32/STM8, 2013-04-12, 11:14, 154 people read comments (0) collection report /**************************************************************************** * STM32 microcontroller, SysTick system, tick timer, experimental procedures * * * *****************************************************************************/ #ifndef _SYSTICK_H #define _SYSTICK_H #include SysTick.h #define (SYSTICK_CSR ((volatile unsigned * long * 0xE000E010))) / / control register #define (SYSTICK_LOAD ((volatile unsigned * long * 0xE000E014))) / / reload registers #define (SYSTICK_VAL ((volatile unsigned * long * 0xE000E018))) / / current value register #define (SYSTICK_CALRB ((volatile unsigned * long * 0xE000E01C))) / / calibration value register Unsigned long SysTick_Delay; / / global variables / / configuration register Void SysTick_InitStructReadCmd (void) { SYSTICK_VAL = 0; / / the current zero value register SYSTICK_LOAD = SystemCoreClock / 1000000; / / an important part here is the system of/ 100000 SYSTICK_CSR |= 0x06; / / the first time can make SysTick close in the open } / / interrupt service program Void SysTick_Hangler (void) { SYSTICK_VAL = 0; / / the current zero value register If (SysTick_Delay! = 0x00 / SysTick_Delay) to judge the delay is equal to 0 { SysTick_Delay--; / / reduced to 0 end } } / / delay function Void Delay_10us (unsigned, long, Countlinef) { SYSTICK_CSR |= 0x07; / / SysTick to start SysTick_Delay = Countlinef; / / assign delay variable SysTick_Delay global variables While (SysTick_Delay! = 0); / / judge whether to delay time SYSTICK_CSR |= 0x06; / / time to close the SysTick which can be used in the open } Int main (void) { (SystemInit); / / note so is the system clock initialization is clocked at 72M, here is a must SysTick_InitStructReadCmd (); While (1) { GPIOD-BSRR = 0 Delay_10us (1000000); / / 1ms delay GPIOD-BRR = 0 } } //====