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reducing to one magical value, putting reference to nrf51-pwm-library

This commit is contained in:
Stephane D'Alu 2016-11-24 12:00:11 +01:00
parent 7ea44ed39c
commit 5c85f5a7ce
1 changed files with 17 additions and 2 deletions
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19
os/hal/ports/NRF5/NRF51822/hal_pwm_lld.c
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@ -18,6 +18,11 @@
* @file hal_pwm_lld.c
* @brief NRF51 PWM subsystem low level driver source.
*
* @note Using the method described in nrf51-pwm-library to correctly
* handle toggling of the pin with GPIOTE when changing period.
* It means it is generally unsafe to use GPIOTE with a period
* less than (2 * PWM_GPIOTE_DECISION_TIME / 16MHz)
*
* @addtogroup PWM
* @{
*/
@ -31,6 +36,7 @@
/*===========================================================================*/
#define PWM_GPIOTE_PPI_CC 3
#define PWM_GPIOTE_DECISION_TIME 160
/*===========================================================================*/
/* Driver exported variables. */
@ -65,7 +71,16 @@ PWMDriver PWMD3;
/*===========================================================================*/
static const uint8_t pwm_margin_by_prescaler[] = {
80, 40, 20, 15, 10, 5, 2, 1, 1, 1
(PWM_GPIOTE_DECISION_TIME + 0) >> 0,
(PWM_GPIOTE_DECISION_TIME + 1) >> 1,
(PWM_GPIOTE_DECISION_TIME + 3) >> 2,
(PWM_GPIOTE_DECISION_TIME + 7) >> 3,
(PWM_GPIOTE_DECISION_TIME + 15) >> 4,
(PWM_GPIOTE_DECISION_TIME + 31) >> 5,
(PWM_GPIOTE_DECISION_TIME + 63) >> 6,
(PWM_GPIOTE_DECISION_TIME + 128) >> 7,
(PWM_GPIOTE_DECISION_TIME + 255) >> 8,
(PWM_GPIOTE_DECISION_TIME + 511) >> 9
};
/*===========================================================================*/
@ -349,7 +364,7 @@ void pwm_lld_enable_channel(PWMDriver *pwmp,
current = pwmp->timer->CC[PWM_GPIOTE_PPI_CC];
if (pwm_within_safe_margins(pwmp, current, old_width) &&
pwm_within_safe_margins(pwmp, current, new_width))
pwm_within_safe_margins(pwmp, current, new_width))
break;
}
if (((old_width <= current) && (current < new_width)) ||