Question
Timer output goes hi while starting DMA.
My CPU is STM32H750VBTx
My Configuration of the timer is
void MX_TIM2_Init(void)
{
TIM_SlaveConfigTypeDef sSlaveConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
htim2.Instance = TIM2;
htim2.Init.Prescaler = 0;
htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
htim2.Init.Period = 0xFFFFFFFF;
htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_OC_Init(&htim2) != HAL_OK)
{
Error_Handler();
}
sSlaveConfig.SlaveMode = TIM_SLAVEMODE_EXTERNAL1;
sSlaveConfig.InputTrigger = TIM_TS_ITR2;
if (HAL_TIM_SlaveConfigSynchro(&htim2, &sSlaveConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim2, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_TOGGLE;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_LOW;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_TIMING;
if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_TOGGLE;
if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_TIMING;
if (HAL_TIM_OC_ConfigChannel(&htim2, &sConfigOC, TIM_CHANNEL_4) != HAL_OK)
{
Error_Handler();
}
HAL_TIM_MspPostInit(&htim2);
}void HAL_TIM_Base_MspInit(TIM_HandleTypeDef* tim_baseHandle)
{
if(tim_baseHandle->Instance==TIM2)
{
/* USER CODE BEGIN TIM2_MspInit 0 */
/* USER CODE END TIM2_MspInit 0 */
/* TIM2 clock enable */
__HAL_RCC_TIM2_CLK_ENABLE();
/* TIM2 DMA Init */
/* TIM2_CH1 Init */
hdma_tim2_ch1.Instance = DMA1_Stream6;
hdma_tim2_ch1.Init.Request = DMA_REQUEST_TIM2_CH1;
hdma_tim2_ch1.Init.Direction = DMA_MEMORY_TO_PERIPH;
hdma_tim2_ch1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim2_ch1.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim2_ch1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_tim2_ch1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_tim2_ch1.Init.Mode = DMA_NORMAL;
hdma_tim2_ch1.Init.Priority = DMA_PRIORITY_HIGH;
hdma_tim2_ch1.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_tim2_ch1) != HAL_OK)
{
Error_Handler();
}
I start the DMA transfer like this
m_oRet = HAL_TIM_OC_Start_DMA(&htim2, TIM_CHANNEL_1, &m_aunTimer[0], 4);But the function
void TIM_CCxChannelCmd(TIM_TypeDef *TIMx, uint32_t Channel, uint32_t ChannelState)
{
uint32_t tmp;
/* Check the parameters */
assert_param(IS_TIM_CC1_INSTANCE(TIMx));
assert_param(IS_TIM_CHANNELS(Channel));
tmp = TIM_CCER_CC1E << (Channel & 0x1FU); /* 0x1FU = 31 bits max shift */
/* Reset the CCxE Bit */
TIMx->CCER &= ~tmp;
/* Set or reset the CCxE Bit */
TIMx->CCER |= (uint32_t)(ChannelState << (Channel & 0x1FU)); /* 0x1FU = 31 bits max shift */
}rise the output for one timer clock.
If I change the function to
void TIM_CCxChannelCmd(TIM_TypeDef *TIMx, uint32_t Channel, uint32_t ChannelState)
{
uint32_t tmp;
/* Check the parameters */
assert_param(IS_TIM_CC1_INSTANCE(TIMx));
assert_param(IS_TIM_CHANNELS(Channel));
tmp = TIM_CCER_CC1E << (Channel & 0x1FU); /* 0x1FU = 31 bits max shift */
/* Reset the CCxE Bit */
//TIMx->CCER &= ~tmp;
/* Set or reset the CCxE Bit */
TIMx->CCER = (TIMx->CCER & ~tmp) | (uint32_t)(ChannelState << (Channel & 0x1FU)); /* 0x1FU = 31 bits max shift */
}It is ok.
Can some one change the library.
My version is STM32Cube FW_H7 V1.4.0