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我有一个STM32F769I-EVAL配置为接收基于ST的AN4666代码的8位并行数据。我期望发生的情况是：来自输入设备的时钟触发输入捕捉DMA并将数据写入SDRAM，直到OC定时器中断禁止传输。此时，我可以操纵SDRAM中的数据并将其传输到其他地方。但是，硬件配置完成并且启用输入捕捉后，会出现DMA传输错误。 HAL_DMA_IRQHandler函数中errorcode（6）的值表示设置了FIFO和传输错误标志。根据我对datasheet（请参阅第261页）的理解，这应该是不可能的，我认为我错误地配置了某个设置，但是我仍然无法完成设置。我可以采取哪些措施来解决这个问题？STM32 DMA传输错误，同时设置FIFO和传输错误标志
DMA配置：
void HAL_TIM_Base_MspInit(TIM_HandleTypeDef *htim)
{
GPIO_InitTypeDef GPIO_InitStruct;
static DMA_HandleTypeDef hdma_tim;
/* TIMx clock enable */
TIMx_CLK_ENABLE();
/* Enable DMA clock */
DMAx_CLK_ENABLE();
/* Enable TIM input GPIO clock */
TIMx_CHy_GPIOCLK_ENABLE();
/* Configure input of TIMx_CHy on AF */
GPIO_InitStruct.Pin = TIMx_CHy_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF_TIMx;
HAL_GPIO_Init(TIMx_CHy_PORT, &GPIO_InitStruct);
/* Set the parameters to be configured */
hdma_tim.Init.Channel = DMA_CHANNEL;
hdma_tim.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_tim.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_tim.Init.MemInc = DMA_MINC_ENABLE;
hdma_tim.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE ; /* Reading in GPIO PC[7:0]*/
hdma_tim.Init.MemDataAlignment = DMA_MDATAALIGN_WORD ;
hdma_tim.Init.Mode = DMA_NORMAL; /* double memory buffer used */
hdma_tim.Init.Priority = DMA_PRIORITY_HIGH;
hdma_tim.Init.FIFOMode = DMA_FIFOMODE_ENABLE; /* using FIFO mode since memory datasize=32bit and GPIO=8bits in our case */
hdma_tim.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_1QUARTERFULL; /* flushing FIFO at each 32bit reception (4 data) */
hdma_tim.Init.MemBurst = DMA_MBURST_SINGLE;
hdma_tim.Init.PeriphBurst = DMA_PBURST_SINGLE;
/* Set hdma_tim instance */
hdma_tim.Instance = DMA_STREAM;
/* Link hdma_tim to hdma[CC1] */
__HAL_LINKDMA(htim, hdma[TIMx_DMA_ID], hdma_tim);
/* Initialize TIMx DMA handle */
HAL_DMA_Init(htim->hdma[TIMx_DMA_ID]);
/* NVIC configuration for TIMx output compare interrupt */
HAL_NVIC_SetPriority(TIMx_IRQn, 0, 2);
HAL_NVIC_EnableIRQ(TIMx_IRQn);
/* Configure the NVIC for DMA */
/* NVIC configuration for DMA transfer complete interrupt */
HAL_NVIC_SetPriority(TIMx_DMA_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(TIMx_DMA_IRQn);
}
从主代码：
/* Initialize SDRAM */
BSP_SDRAM_Init();
/* Configure the Data GPIO in input mode */
Data_GPIO_Config();
/* Set Timers instance */
TimHandle.Instance = TIMx;
/* Initialize global Timer parameters */
TimHandle.Init.Period = MAX_COUNTER;
TimHandle.Init.Prescaler = TIMx_PRESCALER - 1;
TimHandle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
TimHandle.Init.RepetitionCounter = 0;
if (HAL_TIM_Base_Init(&TimHandle) != HAL_OK)
{
/* Initialization Error */
Error_Handler();
}
//Initialize Timer "OC" channel for OC mode
sOConfig.OCMode = TIM_OCMODE_TIMING/*TIM_OCMODE_TOGGLE*/;
sOConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
sOConfig.Pulse = NB_COUNTER_CYCLE;
sOConfig.OCNPolarity = TIM_OCPOLARITY_HIGH;
sOConfig.OCFastMode = TIM_OCFAST_DISABLE;
sOConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
sOConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
if (HAL_TIM_OC_ConfigChannel(&TimHandle, &sOConfig, TIMx_CHANNEL_OC) != HAL_OK)
{
//Configuration Error
Error_Handler();
}
/* Initialize Timer "IC" channel for IC mode */
sICConfig.ICPolarity = CLK_LATCHING_DATA_EDGE;
sICConfig.ICSelection = TIM_ICSELECTION_DIRECTTI;
sICConfig.ICPrescaler = TIM_ICPSC_DIV1;
sICConfig.ICFilter = TIM_IC_FILTER; /* filter the clock signal over/undershoot */
if (HAL_TIM_IC_ConfigChannel(&TimHandle, &sICConfig, TIMx_CHANNEL_IC) != HAL_OK)
{
/* Configuration Error */
Error_Handler();
}
/* Set the DMA memory0 conversion complete callback */
TimHandle.hdma[TIMx_DMA_ID]->XferCpltCallback = TransferComplete;
/* Set the DMA memory1 conversion complete callback */
TimHandle.hdma[TIMx_DMA_ID]->XferM1CpltCallback = TransferComplete;
/* Set the DMA error callback */
TimHandle.hdma[TIMx_DMA_ID]->XferErrorCallback = TransferError ;
/* Update second memory address */
second_mem_address = (uint32_t)((SDRAM_BANK_ADDR + WRITE_READ_ADDR) + (DMA_MEM_BUFF_SIZE));
/* Start DMA multi buffer transfer */
if (HAL_DMAEx_MultiBufferStart_IT(TimHandle.hdma[TIMx_DMA_ID], GPIOx_IDR, (SDRAM_BANK_ADDR + WRITE_READ_ADDR), second_mem_address, DMA_MEM_BUFF_SIZE) != HAL_OK)
{
/* Transfer Error */
Error_Handler();
}
__HAL_TIM_ENABLE_DMA(&TimHandle, TIMx_DMA_CC);
/* Enable the TIMx OC channel interrupt */
__HAL_TIM_ENABLE_IT(&TimHandle, TIMx_IT_OC);
/* Enable the TIMX OC channel */
TIM_CCxChannelCmd(TimHandle.Instance, TIMx_CHANNEL_OC, TIM_CCx_ENABLE);
/* Enable the TIMx IC channel */
TIM_CCxChannelCmd(TimHandle.Instance, TIMx_CHANNEL_IC, TIM_CCx_ENABLE);
HAL_TIM_OC_Start(&TimHandle, TIMx_CHANNEL_OC); // enable counter
/* processing while Timeout not reached */
while (timeout_flag == 0);
STlib HAL只是英国媒体报道，没有任何好处。使用直接注册编程。这样你可以直接检查状态寄存器并检查标志的含义。使用调试器进行仔细检查。 – Olaf
如果我编写自己的驱动程序，ST的HAL是否会改变状态寄存器中的值？我可以在调试器中看到状态寄存器，并且上述错误标志在DMA_HISR中断状态寄存器中设置，但我不知道我应该寻找什么来解决我所看到的问题。 – anOkCoder
自从我第一次看到那个烂摊子以来，我并没有和HAL一起工作。由于它声称是“硬件**抽象**层”，我会假设它。但是，它使调试和代码复杂化。相反，将语音驱动程序中的硬件访问封装起来（无论如何，HAL与否都是最佳实践）。 – Olaf