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, 14 insertions, 8 deletions

diff --git a/testhal/STM32/PWM-ICU/main.c b/testhal/STM32/PWM-ICU/main.c
index 3f7b6423e..1fd56c33a 100644
--- a/testhal/STM32/PWM-ICU/main.c
+++ b/testhal/STM32/PWM-ICU/main.c
@@ -89,7 +89,7 @@ int main(void) {
   palSetPad(IOPORT3, GPIOC_LED);

 

   /*

-   * Initializes the PWM driver 1.

+   * Initializes the PWM driver 1 and ICU driver 4.

    */

   pwmStart(&PWMD1, &pwmcfg);

   palSetPadMode(IOPORT1, 8, PAL_MODE_STM32_ALTERNATE_PUSHPULL);

@@ -98,26 +98,32 @@ int main(void) {
   chThdSleepMilliseconds(2000);

 

   /*

-   * Starts the channel 0 using 25% duty cycle.

+   * Starts the PWM channel 0 using 75% duty cycle.

    */

-  pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 2500));

+  pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 7500));

   chThdSleepMilliseconds(5000);

 

   /*

-   * Changes the channel 0 to 75% duty cycle.

+   * Changes the PWM channel 0 to 50% duty cycle.

    */

-  pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 7500));

+  pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 5000));

+  chThdSleepMilliseconds(5000);

+

+  /*

+   * Changes the PWM channel 0 to 25% duty cycle.

+   */

+  pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 2500));

   chThdSleepMilliseconds(5000);

 

   /*

-   * Changes PWM period to half second and duty cycle to 50%.

+   * Changes PWM period to half second the duty cycle becomes 50%

+   * implicitly.

    */

   pwmChangePeriod(&PWMD1, 5000);

-  pwmEnableChannel(&PWMD1, 0, PWM_PERCENTAGE_TO_WIDTH(&PWMD1, 5000));

   chThdSleepMilliseconds(5000);

 

   /*

-   * Disables channel 0.

+   * Disables channel 0 and stops the drivers.

    */

   pwmDisableChannel(&PWMD1, 0);

   pwmStop(&PWMD1);