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, 19 insertions, 5 deletions

diff --git a/os/hal/platforms/STM32/pwm_lld.h b/os/hal/platforms/STM32/pwm_lld.h
index 3d0d9d79c..2b3ce7183 100644
--- a/os/hal/platforms/STM32/pwm_lld.h
+++ b/os/hal/platforms/STM32/pwm_lld.h
@@ -296,10 +296,6 @@ struct PWMDriver {
 #endif

   /* End of the mandatory fields.*/

   /**

-   * @brief Bit mask of the enabled channels.

-   */

-  uint32_t                  enabled_channels;

-  /**

    * @brief Pointer to the TIMx registers block.

    */

   TIM_TypeDef               *tim;

@@ -309,6 +305,25 @@ struct PWMDriver {
 /* Driver macros.                                                            */

 /*===========================================================================*/

 

+/**

+ * @brief   Changes the period the PWM peripheral.

+ * @details This function changes the period of a PWM unit that has already

+ *          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.

+ * @note    The function has effect at the next cycle start.

+ * @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

+ *

+ * @notapi

+ */

+#define pwm_lld_change_period(pwmp, period)                                 \

+  ((pwmp)->tim->ARR = (uint16_t)((period) - 1))

+

 /*===========================================================================*/

 /* External declarations.                                                    */

 /*===========================================================================*/

@@ -339,7 +354,6 @@ extern "C" {
   void pwm_lld_init(void);

   void pwm_lld_start(PWMDriver *pwmp);

   void pwm_lld_stop(PWMDriver *pwmp);

-  void pwm_lld_change_period(PWMDriver *pwmp, pwmcnt_t period);

   void pwm_lld_enable_channel(PWMDriver *pwmp,

                               pwmchannel_t channel,

                               pwmcnt_t width);