STM32 PWM driver optimization, changed the behavior of pwmChangePeriod().

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2869 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 4 insertions, 7 deletions

diff --git a/os/hal/src/pwm.c b/os/hal/src/pwm.c
index ed80ec24b..e7dd6b64c 100644
--- a/os/hal/src/pwm.c
+++ b/os/hal/src/pwm.c
@@ -124,11 +124,9 @@ void pwmStop(PWMDriver *pwmp) {
  *          been activated using @p pwmStart().

  * @pre     The PWM unit must have been activated using @p pwmStart().

  * @post    The PWM unit period is changed to the new value.

- * @post    Any active channel is disabled by this function and must be

- *          activated explicitly using @p pwmEnableChannel().

- * @note    Depending on the hardware implementation this function has

- *          effect starting on the next cycle (recommended implementation)

- *          or immediately (fallback implementation).

+ * @note    If a period is specified that is shorter than the pulse width

+ *          programmed in one of the channels then the behavior is not

+ *          guaranteed.

  *

  * @param[in] pwmp      pointer to a @p PWMDriver object

  * @param[in] period    new cycle time in ticks

@@ -142,8 +140,7 @@ void pwmChangePeriod(PWMDriver *pwmp, pwmcnt_t period) {
   chSysLock();

   chDbgAssert(pwmp->state == PWM_READY,

               "pwmChangePeriod(), #1", "invalid state");

-  pwmp->period = period;

-  pwm_lld_change_period(pwmp, period);

+  pwmChangePeriodI(pwmp, period);

   chSysUnlock();

 }