Counter using hrtim

Forum|Forum|11 months ago
March 11, 2025
2 replies
878 views

Hii,

I am using hrtim in stm32G474RET6 mcu, so i want to know how we generate a counter of 500ns in which i call adc in it.

If somebody know about it please help me.

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Best answer by ELABI.1

Hi @Harsh_18,

You can use a DMA request. The ADC is capable of generating this request to notify the DMA of the end of the conversion. The best way to use the DMA with the ADC is in continuous mode, with a DMA destination (a variable in memory), so that the user can use this variable without worrying about when it is updated by the ADC. When the ADC completes the conversion, it generates a request to the DMA, which copies it into this variable. Since continuous mode is enabled and the DMA is in circular mode, all the previous steps will restart automatically.

Here is the necessary configuration for this behavior:

For starting the ADC with DMA and specifying the destination variable, you could use:

if (HAL_ADC_Start_DMA(&hadc1, (uint32_t *) &VARIABLE_DESTINATION, 1) != HAL_OK)
{
/* ADC initiliazation Error */
Error_Handler();
}

Thank you.

ELABI.1

E

ELABI.1

Technical Moderator

Hi @Harsh_18,

You can refer to the Application Note AN5305, specifically section "2.8 Configuring the high-resolution timer". Additionally, you can consult the HRTIMcookbook, which can help you.

Thank you.

ELABI.1

H

Harsh_18Author

Visitor II

Hi @ELABI.1,

I worked on hal driver, so can you please guide me.

E

ELABI.1

Technical Moderator

Hi @Harsh_18?,

To generate a 500 ns PWM, you need to program and activate a counter with: HAL_HRTIM_WaveformCounterStart_IT(&hhrtim1, HRTIM_TIMERID_TIMER_A); / HAL_HRTIM_WaveformOutputStart(&hhrtim1, HRTIM_OUTPUT_TA1) for example, and generate a trigger to the ADC by this Timer unit, you can program the trigger at the beginning of the period: