STM32H7 DMA issue

[zhaowhong]

Hello

My current requirement is to generate an FSK waveform with two frequencies around 3-5 MHz, a rate of about 700K, and output a square wave using PWM. The method involves switching frequencies by updating ARR and CCR using two timers—one for PWM output and the other for frequency switching (updating ARR and CCR). The main issue is updating ARR and CCR simultaneously since these addresses are not contiguous, and various methods tried have failed. See if the approach below works.

void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* htim_base)

{

if(htim_base->Instance==TIM1)

{

/* USER CODE BEGIN TIM1_MspInit 0 */

/* USER CODE END TIM1_MspInit 0 */

/* Peripheral clock enable */

__HAL_RCC_TIM1_CLK_ENABLE();

/* TIM1 DMA Init */

/* TIM1_TRIG Init */

hdma_tim1_trig.Instance = DMA1_Stream1;

hdma_tim1_trig.Init.Request = DMA_REQUEST_TIM1_TRIG;

hdma_tim1_trig.Init.Direction = DMA_MEMORY_TO_PERIPH;

hdma_tim1_trig.Init.PeriphInc = DMA_PINC_DISABLE;

hdma_tim1_trig.Init.MemInc = DMA_MINC_ENABLE;

hdma_tim1_trig.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;

hdma_tim1_trig.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;

hdma_tim1_trig.Init.Mode = DMA_CIRCULAR;

hdma_tim1_trig.Init.Priority = DMA_PRIORITY_VERY_HIGH;

hdma_tim1_trig.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

if (HAL_DMA_Init(&hdma_tim1_trig) != HAL_OK)

{

Error_Handler();

}

__HAL_LINKDMA(htim_base,hdma[TIM_DMA_ID_TRIGGER],hdma_tim1_trig);

/* USER CODE BEGIN TIM1_MspInit 1 */

/* 手动配置TIM1 CCR的DMA流 */

hdma_tim1_ccr.Instance = DMA1_Stream2;

hdma_tim1_ccr.Init.Request = DMA_REQUEST_TIM1_TRIG;

hdma_tim1_ccr.Init.Direction = DMA_MEMORY_TO_PERIPH;

hdma_tim1_ccr.Init.PeriphInc = DMA_PINC_DISABLE;

hdma_tim1_ccr.Init.MemInc = DMA_MINC_ENABLE;

hdma_tim1_ccr.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;

hdma_tim1_ccr.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;

hdma_tim1_ccr.Init.Mode = DMA_CIRCULAR;

hdma_tim1_ccr.Init.Priority = DMA_PRIORITY_VERY_HIGH;

hdma_tim1_ccr.Init.FIFOMode = DMA_FIFOMODE_DISABLE;

if (HAL_DMA_Init(&hdma_tim1_ccr) != HAL_OK)

{

Error_Handler();

}

// 使能TIM3的触发DMA请求

TIM3->DIER |= TIM_DIER_TDE;

__HAL_LINKDMA(htim_base, hdma[TIM_DMA_ID_TRIGGER], hdma_tim1_ccr);

/* USER CODE END TIM1_MspInit 1 */

}
I use TIM3 as the master timer and TIM1 as the slave timer, with TIM3 triggering DMA.

Can the STM32H7 trigger two DMAs simultaneously with one event? I see that in STM32CubeIDE, it's one-to-one by default. Is it possible to manually add two DMA streams to modify ARR and CCR simultaneously?