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Bugfix: corrects the ARR calculation for the LED PWM timer

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The calculation of the ARR on the LED PWM timer did not subtract 1
from the timer period calculation to get the ARR value.
This commit is contained in:
Karl Schwabe
2017-09-14 04:10:41 -10:00
committed by David Sidrane
parent 8f7e2158f1
commit 6d1aa4cad2
1 changed files with 2 additions and 2 deletions
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src/drivers/stm32/drv_led_pwm.cpp
+2 -2
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@@ -147,14 +147,14 @@ static void led_pwm_timer_init_timer(unsigned timer)
/* If the timer clock source provided as clock_freq is the STM32_APBx_TIMx_CLKIN
* then configure the timer to free-run at 1MHz.
* Otherwize, other frequencies are attainable by adjusting .clock_freq accordingly.
* Otherwise, other frequencies are attainable by adjusting .clock_freq accordingly.
*/
rPSC(timer) = (led_pwm_timers[timer].clock_freq / 1000000) - 1;
/* configure the timer to update at the desired rate */
rARR(timer) = 1000000 / LED_PWM_RATE;
rARR(timer) = (1000000 / LED_PWM_RATE) - 1;
/* generate an update event; reloads the counter and all registers */
rEGR(timer) = GTIM_EGR_UG;