Posted on March 06, 2018 at 16:54Clive,
I thought this was a forum for writing ST technical support professionals, actual employees of ST. I am sorry for venting to you, if you too are a developer and not formally associated ST. This is quite literally the 10th time I have contacted ST on this or a related issue, and there has been no response.
Now, thank you for sharing the information that you have. Regardless of the pin that has been selected - this can be changed quite easily - there is still the need to measuring the PWM pulse time. If, for example, pin PC5 (TIM2_Channel1) were used and the PWMI Init function were used (see below), how would one extract the pulse time and mange the timer. If there were any example code for this, it would be useful.
/**
* @brief Configures the TIM2 peripheral in PWM Input Mode according to the specified parameters.
* @param TIM2_Channel specifies the Input Capture Channel from @ref TIM2_Channel_TypeDef.
* @param TIM2_ICPolarity specifies the Input Capture Polarity from @ref TIM2_ICPolarity_TypeDef.
* @param TIM2_ICSelection specifies the Input Capture Selection from @ref TIM2_ICSelection_TypeDef.
* @param TIM2_ICPrescaler specifies the Input Capture Prescaler from @ref TIM2_ICPSC_TypeDef.
* @param TIM2_ICFilter specifies the Input Capture Filter value (value can be an integer from 0x00 to 0x0F).
* @retval None
*/
void TIM2_PWMIConfig(TIM2_Channel_TypeDef TIM2_Channel,
TIM2_ICPolarity_TypeDef TIM2_ICPolarity,
TIM2_ICSelection_TypeDef TIM2_ICSelection,
TIM2_ICPSC_TypeDef TIM2_ICPrescaler,
uint8_t TIM2_ICFilter)
{
uint8_t icpolarity = (uint8_t)TIM2_ICPOLARITY_RISING;
uint8_t icselection = (uint8_t)TIM2_ICSELECTION_DIRECTTI;
/* Check the parameters */
assert_param(IS_TIM2_PWMI_CHANNEL_OK(TIM2_Channel));
assert_param(IS_TIM2_IC_POLARITY_OK(TIM2_ICPolarity));
assert_param(IS_TIM2_IC_SELECTION_OK(TIM2_ICSelection));
assert_param(IS_TIM2_IC_PRESCALER_OK(TIM2_ICPrescaler));
/* Select the Opposite Input Polarity */
if (TIM2_ICPolarity != TIM2_ICPOLARITY_FALLING)
{
icpolarity = (uint8_t)TIM2_ICPOLARITY_FALLING;
}
else
{
icpolarity = (uint8_t)TIM2_ICPOLARITY_RISING;
}
/* Select the Opposite Input */
if (TIM2_ICSelection == TIM2_ICSELECTION_DIRECTTI)
{
icselection = (uint8_t)TIM2_ICSELECTION_INDIRECTTI;
}
else
{
icselection = (uint8_t)TIM2_ICSELECTION_DIRECTTI;
}
if (TIM2_Channel == TIM2_CHANNEL_1)
{
/* TI1 Configuration */
TI1_Config((uint8_t)TIM2_ICPolarity, (uint8_t)TIM2_ICSelection,
(uint8_t)TIM2_ICFilter);
/* Set the Input Capture Prescaler value */
TIM2_SetIC1Prescaler(TIM2_ICPrescaler);
/* TI2 Configuration */
TI2_Config(icpolarity, icselection, TIM2_ICFilter);
/* Set the Input Capture Prescaler value */
TIM2_SetIC2Prescaler(TIM2_ICPrescaler);
}
else
{
/* TI2 Configuration */
TI2_Config((uint8_t)TIM2_ICPolarity, (uint8_t)TIM2_ICSelection,
(uint8_t)TIM2_ICFilter);
/* Set the Input Capture Prescaler value */
TIM2_SetIC2Prescaler(TIM2_ICPrescaler);
/* TI1 Configuration */
TI1_Config((uint8_t)icpolarity, icselection, (uint8_t)TIM2_ICFilter);
/* Set the Input Capture Prescaler value */
TIM2_SetIC1Prescaler(TIM2_ICPrescaler);
}
}
