Posted on August 04, 2016 at 12:07 Dear,
I want to generate the 4 signals for a H bridge to create a sinusoidal signal by pwm
So I used Timer 1 and its 4 channels powered by a DMA in burst mode
The PWM data are organized in an array of 360 structures
{
{CCR1, CCR2, CCR3, CCR4},
…
{CCR1, CCR2, CCR3, CCR4},
}
I wanted to start by HAL_TIM_DMABurst_WriteStart() but I found this function not enough flexible as the same variable (BurstLength) is used to program:
the number of data to transfer in the DMA_SxNDTR register
/* Enable the DMA Stream */
HAL_DMA_Start_IT(htim->hdma[TIM_DMA_ID_CC1], (uint32_t)BurstBuffer, (uint32_t)&htim->Instance->DMAR, ((BurstLength) >> 8U) + 1U);
and the DMA burst length in the TIM1_DCR timer
/* configure the DMA Burst Mode */
htim->Instance->DCR = BurstBaseAddress | BurstLength;
I think it should be different; in my case
/* Enable the DMA Stream */
HAL_DMA_Start_IT(htim->hdma[TIM_DMA_ID_CC1], (uint32_t)BurstBuffer, (uint32_t)&htim->Instance->DMAR, 360*4;
/* configure the DMA Burst Mode */
htim->Instance->DCR = BurstBaseAddress | TIM_DMABURSTLENGTH_4TRANSFERS;
In final
HAL_StatusTypeDef HAL_TIM_DMABurst_WriteStart(TIM_HandleTypeDef *htim, uint32_t BurstBaseAddress, uint32_t BurstRequestSrc,
uint32_t* BurstBuffer, uint32_t BurstLength)
should be
HAL_StatusTypeDef HAL_TIM_DMABurst_WriteStart(TIM_HandleTypeDef *htim, uint32_t BurstBaseAddress, uint32_t BurstRequestSrc,
uint32_t* Buffer, uint32_t BufferLength,
uint32_t BurstLength)
My platform is STM32F429 Cube_FW_F4_V1.12.0
Regards
