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STM32 Timer Driver: Change calculation of per-timer pre-scaler value

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This commit is contained in:
Pierre-noel Bouteville 2016-06-03 08:45:22 -06:00 committed by Gregory Nutt
parent 7e2aed942a
commit 082d32226b
1 changed files with 84 additions and 10 deletions
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94
arch/arm/src/stm32/stm32_tim.c
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@ -324,17 +324,91 @@ static int stm32_tim_setclock(FAR struct stm32_tim_dev_s *dev, uint32_t freq)
return 0;
}
#if STM32_NATIM > 0
if (((struct stm32_tim_priv_s *)dev)->base == STM32_TIM1_BASE ||
((struct stm32_tim_priv_s *)dev)->base == STM32_TIM8_BASE)
{
prescaler = STM32_TIM18_FREQUENCY / freq;
}
else
switch (((struct stm32_tim_priv_s *)dev)->base)
{
#ifdef STM32_APB2_TIM1_CLKIN
case STM32_TIM1_BASE:
prescaler = STM32_APB2_TIM1_CLKIN / freq;
break;
#endif
{
prescaler = STM32_TIM27_FREQUENCY / freq;
}
#ifdef STM32_APB2_TIM2_CLKIN
case STM32_TIM2_BASE:
prescaler = STM32_APB2_TIM2_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM3_CLKIN
case STM32_TIM3_BASE:
prescaler = STM32_APB2_TIM3_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM4_CLKIN
case STM32_TIM4_BASE:
prescaler = STM32_APB2_TIM4_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM5_CLKIN
case STM32_TIM5_BASE:
prescaler = STM32_APB2_TIM5_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM6_CLKIN
case STM32_TIM6_BASE:
prescaler = STM32_APB2_TIM6_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM7_CLKIN
case STM32_TIM7_BASE:
prescaler = STM32_APB2_TIM7_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM8_CLKIN
case STM32_TIM8_BASE:
prescaler = STM32_APB2_TIM8_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM9_CLKIN
case STM32_TIM9_BASE:
prescaler = STM32_APB2_TIM9_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM10_CLKIN
case STM32_TIM10_BASE:
prescaler = STM32_APB2_TIM10_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM11_CLKIN
case STM32_TIM11_BASE:
prescaler = STM32_APB2_TIM11_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM12_CLKIN
case STM32_TIM12_BASE:
prescaler = STM32_APB2_TIM12_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM13_CLKIN
case STM32_TIM13_BASE:
prescaler = STM32_APB2_TIM13_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM14_CLKIN
case STM32_TIM14_BASE:
prescaler = STM32_APB2_TIM14_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM15_CLKIN
case STM32_TIM15_BASE:
prescaler = STM32_APB2_TIM15_CLKIN / freq;
break;
#endif
#ifdef STM32_APB2_TIM16_CLKIN
case STM32_TIM16_BASE:
prescaler = STM32_APB2_TIM16_CLKIN / freq;
break;
#endif
default:
return ERROR;
}
/* We need to decrement value for '1', but only, if we are allowed to
* not to cause underflow. Check for overflow.