Running STM32H7 timers at 480Mhz

[JLope.11]

Hello, how can I get timers running at 480Mhz to have maximum resolution?

Here is a capture using latest stmcube version:

I have tried D2PRE1 & D2PRE2 

=1 but then warnings appear

[Sarra.S · Accepted solution]

Hello @JLope.11, 

No, this frequency is out of range for timers, maximal clock for timers is 240Mhz 

you can use HRTIM for high-resolution that can reach 400 MHz (check Timer resolution and min. PWM frequency Fhrtim in RM ) 

[JLope.11]

I have seen that the HRTIM can be used as independent PWMs (up to 8 lines) at 480Mhz that can give 2ns resolution but cant be used as line and complementary one.

[AScha.3]

read the rm..

[JLope.11]

It is possible to make changes of frequency and duty cycle of a HRTIM without resetting the pwm or introduce glitches?.

To change the period and duty cycle I should do:

  HRTIM_TimeBaseCfgTypeDef pTimeBaseCfg = {0};
  pTimeBaseCfg.Period = 2892;
  if (HAL_HRTIM_TimeBaseConfig(&hhrtim, HRTIM_TIMERINDEX_TIMER_A, &pTimeBaseCfg) != HAL_OK)
  {
    Error_Handler();
  }

  HRTIM_CompareCfgTypeDef pCompareCfg = {0};
  pCompareCfg.CompareValue = 1446;
  if (HAL_HRTIM_WaveformCompareConfig(&hhrtim, HRTIM_TIMERINDEX_TIMER_A, HRTIM_COMPAREUNIT_1, &pCompareCfg) != HAL_OK)
  {
    Error_Handler();
  }

But I do not know if the changes are done in the actual PWM cycle or in the next.

If not, the second option is to  change both at the begin of a cycle (shot by an interruption at the beginning of the timerA)

[AScha.3]

>But I do not know if the changes are done in the actual PWM cycle or in the next.

rtfm

[JLope.11]

I found it at the stm32cubeide:

By default it is disabled. 

In other way how to manage the complementary mode?, I have programmed the timer D-1 and 2, if I make push-pull I can not set the dead time. With dead time I do not know if it is connected the timer D-1 with compare unit-1 and timer D-2 to the compare unit 2 and if it is delayed pulse of the D2 automatic 

I run the code but no signal is generated. Seems that something must be done to make timers run or activate the lines, something like this but for stm32h7xx:

LL_HRTIM_EnableOutput(HRTIM1, LL_HRTIM_OUTPUT_TC1 | LL_HRTIM_OUTPUT_TC2);
/* Start HRTIM's TIMER C */
LL_HRTIM_EnableIT_REP(HRTIM1, LL_HRTIM_TIMER_C);
LL_HRTIM_TIM_CounterEnable(HRTIM1, LL_HRTIM_TIMER_C);

Exist an example code?

[AScha.3]

see:

so between TA1 and TA2 outputs.