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| author | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2010-11-21 11:12:54 +0000 |
|---|---|---|
| committer | gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4> | 2010-11-21 11:12:54 +0000 |
| commit | 66c5a970fa52e53e643ef1f3365b4d30debd5bfe (patch) | |
| tree | 6cea71ea231f0a27ebef680a0f60f19bc9175280 /os/hal/templates | |
| parent | 297a1cefa8e045e68c6b12d1cb31525a086ae4ec (diff) | |
| download | ChibiOS-66c5a970fa52e53e643ef1f3365b4d30debd5bfe.tar.gz ChibiOS-66c5a970fa52e53e643ef1f3365b4d30debd5bfe.tar.bz2 ChibiOS-66c5a970fa52e53e643ef1f3365b4d30debd5bfe.zip | |
git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2406 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'os/hal/templates')
| -rw-r--r-- | os/hal/templates/pwm_lld.h | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/os/hal/templates/pwm_lld.h b/os/hal/templates/pwm_lld.h index 1b0b38f75..2b8cf294f 100644 --- a/os/hal/templates/pwm_lld.h +++ b/os/hal/templates/pwm_lld.h @@ -138,6 +138,21 @@ struct PWMDriver { /*===========================================================================*/
/**
+ * @brief Converts from fraction to pulse width.
+ * @note Be careful with rounding errors, this is integer math not magic.
+ * You can specify tenths of thousandth but make sure you have the
+ * proper hardware resolution by carefully choosing the clock source
+ * and prescaler settings, see @p PWM_COMPUTE_PSC.
+ *
+ * @param[in] numerator numerator of the fraction
+ * @param[in] denominator percentage as an integer between 0 and numerator
+ * @return The pulse width to be passed to @p pwmEnableChannel().
+ *
+ * @api
+ */
+#define PWM_FRACTION_TO_WIDTH(pwmp, numerator, denominator) 0
+
+/**
* @brief Converts from degrees to pulse width.
* @note Be careful with rounding errors, this is integer math not magic.
* You can specify hundredths of degrees but make sure you have the
@@ -150,7 +165,8 @@ struct PWMDriver { *
* @api
*/
-#define PWM_DEGREES_TO_WIDTH(pwmp, degrees) 0
+#define PWM_DEGREES_TO_WIDTH(pwmp, degrees) \
+ PWM_FRACTION_TO_WIDTH(pwmp, 36000, degrees)
/**
* @brief Converts from percentage to pulse width.
@@ -165,7 +181,8 @@ struct PWMDriver { *
* @api
*/
-#define PWM_PERCENTAGE_TO_WIDTH(pwmp, percentage) 0
+#define PWM_PERCENTAGE_TO_WIDTH(pwmp, percentage) \
+ PWM_FRACTION_TO_WIDTH(pwmp, 10000, percentage)
/*===========================================================================*/
/* External declarations. */
|