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STM32 PWM: Add logic to handle writes to 32-bit registers properly

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Lederhilger Martin 2015-10-06 07:29:00 -06:00 • committed by Gregory Nutt
parent 2ab66a015b
commit a9c8458458
1 changed files with 20 additions and 1 deletions
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21
arch/arm/src/stm32/stm32_pwm.c
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@ -454,7 +454,26 @@ static uint16_t pwm_getreg(struct stm32_pwmtimer_s *priv, int offset)
static void pwm_putreg(struct stm32_pwmtimer_s *priv, int offset, uint16_t value)
{
putreg16(value, priv->base + offset);
if (priv->timtype == TIMTYPE_GENERAL32 &&
(offset == STM32_GTIM_CNT_OFFSET ||
offset == STM32_GTIM_ARR_OFFSET ||
offset == STM32_GTIM_CCR1_OFFSET ||
offset == STM32_GTIM_CCR2_OFFSET ||
offset == STM32_GTIM_CCR3_OFFSET ||
offset == STM32_GTIM_CCR4_OFFSET))
{
/* a 32 bit access is required for a 32 bit register:
* if only a 16 bit write would be performed, then the
* upper 16 bits of the 32 bit register will be a copy of
* the lower 16 bits.
*/
putreg32(value, priv->base + offset);
}
else
{
putreg16(value, priv->base + offset);
}
}
/****************************************************************************