sysem us startup time

askari.nima · ‎2015-01-13

Posted on January 13, 2015 at 17:25

I use #define micros() SysTick->VAL + HAL_GetTick()*1000

is it true ?

Tesla DeLorean · ‎2015-01-13

Posted on January 13, 2015 at 17:35

I use #define micros() SysTick->VAL + HAL_GetTick()*1000

is it true ?

HAL_GetTick() depends on interrupts functioning, and there's likely a potential race hazard here. Why not use a free running 32-bit counter?

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askari.nima · ‎2015-01-13

Posted on January 13, 2015 at 18:20

I want to make a general library for stm32 micro

I found the way

.h

#ifndef _GENERAL_LIB_H

#define _GENERAL_LIB_H

#ifdef __cplusplus

extern ''C'' {

#endif

#include ''stm32f4xx_hal.h''

uint32_t millis(void);

uint32_t micros(void);

void delay_us(uint32_t delay);

#define delay_ms(delay) HAL_Delay(delay)

#ifdef __cplusplus

}

#endif

.c

#include ''general_lib.h''

//////////////////////////////////////////////////////////////////////

uint32_t millis(void)

{

return HAL_GetTick();

}

//////////////////////////////////////////////////////////////////////

uint32_t micros(void)

{

uint32_t clock1 = (SystemCoreClock/1000);

uint32_t clock2 = (SystemCoreClock/1000000);

return ((clock1-SysTick->VAL)/clock2 +(HAL_GetTick()*1000));

}

//////////////////////////////////////////////////////////////////////

void delay_us(uint32_t delay)

{

uint32_t d2;

d2= micros();

while(micros() - d2 < delay);

}