libs/rt-thread
libs
/
rt-thread
4
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

Merge pull request #2227 from ylz0923/patch-2 

Update board.c
This commit is contained in:
Bernard Xiong 2019-01-25 18:47:03 +08:00 committed by GitHub
parent 7aede1befb a5a4c6a503
commit b3c4f3be20
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 8 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
bsp/stm32f10x-HAL/drivers/board.c
View File

@ -186,15 +186,12 @@ void rt_hw_board_init(void)
*/
void rt_hw_us_delay(rt_uint32_t us)
{
rt_uint32_t delta;
us = us * (SysTick->LOAD / (1000000 / RT_TICK_PER_SECOND));
delta = SysTick->VAL;
if (delta < us)
{
/* wait current OSTick left time gone */
while (SysTick->VAL < us);
us -= delta;
delta = SysTick->LOAD;
}
while (delta - SysTick->VAL < us);
unsigned int start, now, delta, reload, us_tick;
start = SysTick->VAL;
reload = SysTick->LOAD;
us_tick = SystemCoreClock / 1000000UL;
do{
now = SysTick->VAL;
delta = start > now ? start - now : reload + start - now;
} while(delta < us_tick * us);
}