TIM2 clock source disabld but timer still running correctly?

[Ricko]

Hi,

as you can see from the screenshot below I have TIM2 clock source set to disable but the PWM is still running as configured and generates PWM. And it has been like that for the entire project for a while so I just noticed.

Does the time start function automatically select the source to some default like the Internal clock? Or is that Clock source referring to something else? Just asking because I want to make sure the code is running correctly for the right configuration not because of some other settings that somehow override these.

Thank you

 

 

[mƎALLEm]

Hello,

When Clock source is disabled, HAL_TIM_ConfigClockSource() is not generated and when "Internal Clock" is selected, the following code is generated:

 sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
 if (HAL_TIM_ConfigClockSource(&htim2, &sClockSourceConfig) != HAL_OK)
 {
 Error_Handler();
 }

And according to HAL_TIM_ConfigClockSource() implementation TIM_CLOCKSOURCE_INTERNAL does almost nothing, just some bit reset before: 

 /* Reset the SMS, TS, ECE, ETPS and ETRF bits */
 tmpsmcr = htim->Instance->SMCR;
 tmpsmcr &= ~(TIM_SMCR_SMS | TIM_SMCR_TS);
 tmpsmcr &= ~(TIM_SMCR_ETF | TIM_SMCR_ETPS | TIM_SMCR_ECE | TIM_SMCR_ETP);
 htim->Instance->SMCR = tmpsmcr;

 switch (sClockSourceConfig->ClockSource)
 {
 case TIM_CLOCKSOURCE_INTERNAL:
 {
 assert_param(IS_TIM_INSTANCE(htim->Instance));
 break;
 }

So "Internal Clock" and "Disable" seems to have the same behavior.