/** @brief Get Timer clock frequency (before prescaling)
* Only valid if using the internal clock for the timer.
* Currently implemented for STM32F1x and STM32F405xx/407xx STM32F415xx/417xx.
* Not valid for STM32F42xxx and STM32F43xxx.
* @param[in] timer_peripheral Unsigned int32. Timer register address base
* @return Unsigned int32. Timer base frequency
*/
uint32_t timer_get_frequency(uint32_t timer_peripheral)
{
switch (timer_peripheral) {
// Timers on high speed APB2
case TIM1:
case TIM8:
#ifdef TIM9
case TIM9:
#endif
#ifdef TIM10
case TIM10:
#endif
#ifdef TIM11
case TIM11:
#endif
if (!rcc_get_ppre2()) {
/* without APB2 prescaler, runs at APB2 freq */
return rcc_apb2_frequency;
} else {
/* with any ABP2 prescaler, runs at 2 * APB2 freq */
return rcc_apb2_frequency * 2;
}
// timers on low speed APB1
case TIM2:
case TIM3:
case TIM4:
case TIM5:
case TIM6:
case TIM7:
#ifdef TIM12
case TIM12:
#endif
#ifdef TIM13
case TIM13:
#endif
#ifdef TIM14
case TIM14:
#endif
if (!rcc_get_ppre1()) {
/* without APB1 prescaler, runs at APB1 freq */
return rcc_apb1_frequency;
} else {
/* with any ABP1 prescaler, runs at 2 * APB1 freq */
return rcc_apb1_frequency * 2;
}
default:
// other timers currently not supported
break;
}
return 0;
}
/** @brief Get Timer clock frequency (before prescaling)
* Only valid if using the internal clock for the timer.
* Currently implemented for STM32F1x and STM32F405xx/407xx STM32F415xx/417xx.
* Not valid for STM32F42xxx and STM32F43xxx.
* @param[in] timer_peripheral Unsigned int32. Timer register address base
* @return Unsigned int32. Timer base frequency
*/
uint32_t timer_get_frequency(uint32_t timer_peripheral)
{
switch (timer_peripheral) {
// Timers on APB1
case TIM1:
case TIM8:
#ifdef TIM9
case TIM9:
#endif
#ifdef TIM10
case TIM10:
#endif
#ifdef TIM11
case TIM11:
#endif
if (!rcc_get_ppre2())
// no APB2 prescaler
return rcc_ppre2_frequency;
else
return rcc_ppre2_frequency * 2;
// timers on APB2
case TIM2:
case TIM3:
case TIM4:
case TIM5:
case TIM6:
case TIM7:
#ifdef TIM12
case TIM12:
#endif
#ifdef TIM13
case TIM13:
#endif
#ifdef TIM14
case TIM14:
#endif
if (!rcc_get_ppre1())
// no APB2 prescaler
return rcc_ppre1_frequency;
else
return rcc_ppre1_frequency * 2;
default:
// other timers currently not supported
break;
}
return 0;
}