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[components][cputime]to be able trace before use DWT.|使用 DWT 之前必须先使能跟踪系统.

This commit is contained in:
guozhanxin 2018-06-04 14:54:07 +08:00
parent 7d6b7dc3f0
commit e2c89ec0f5
1 changed files with 3 additions and 0 deletions
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3
components/drivers/cputime/cputime_cortexm.c
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@ -54,6 +54,9 @@ int cortexm_cputime_init(void)
/* check support bit */ /* check support bit */
if ((DWT->CTRL & (1UL << DWT_CTRL_NOCYCCNT_Pos)) == 0) if ((DWT->CTRL & (1UL << DWT_CTRL_NOCYCCNT_Pos)) == 0)
{ {
/* enable trace*/
CoreDebug->DEMCR |= (1UL << CoreDebug_DEMCR_TRCENA_Pos);
/* whether cycle counter not enabled */ /* whether cycle counter not enabled */
if ((DWT->CTRL & (1UL << DWT_CTRL_CYCCNTENA_Pos)) == 0) if ((DWT->CTRL & (1UL << DWT_CTRL_CYCCNTENA_Pos)) == 0)
{ {