Default Timer configuration for DAC stm32mp1 cortex M4.

[Sindhu Vadde]

Hi

We are using stm32mp157a processor in my custom board.We want to configure DAC in cortex M4.In stm32h745xi DAC has Default Timer for interrupt.Where as in stm32mp157a we dont have that timer configuration for DAC .you can see the difference in below attachments.

[PatrickF]

Hi @Sindhu Vadde​ ,

that's normal, on STM32H7, due to legacy or shortage of NVIC inputs, the TIM6 and DAC interrupts share the same interrupt line.

In STM32MP15x, there is separate TIM6 and DAC interrupts, which add more flexibility and could reduce amount of code in interrupt handler.

Regards,

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[Sindhu Vadde]

Thanks for the reply,

My code flow :

HAL_TIM_Base_Start(&htim2);

calcsin ();

HAL_DAC_Start_DMA(&hdac1,DAC_CHANNEL_2,sine_val,100,DAC_ALIGN_12B_R);

Sine Function Implementation:

void calcsin ()

 {

    for (int i=0; i<100; i++)

    {

       sine_val[i] = ((sin(i*2*PI/100) + 1)*(4096/2));

    }

 }

Timer Configuration :

htim2.Instance = TIM2;

 htim2.Init.Prescaler = 64-1;

 htim2.Init.CounterMode = TIM_COUNTERMODE_UP;

 htim2.Init.Period = 100-1;

 htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

 htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

 if (HAL_TIM_Base_Init(&htim2) != HAL_OK)

 {

   Error_Handler();

 }

.

but we are uanable to get Timer Interrupt and also unable to generate Sine wave.How can i can i generate sine wavet hrough Dac? What maybe the issue with above configuration?