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Merge pull request #1499 from Guozhanxin/new 

to be able debug trace bit  before use DWT.
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Bernard Xiong 2018-06-04 17:27:31 +08:00 committed by GitHub
parent 7d6b7dc3f0 e2c89ec0f5
commit f0895aa491
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1 changed files with 3 additions and 0 deletions
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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)
{ {