STM32F072 UART DMA Interrupt funktioniert nicht

[Leon L. (leonelf)]

Hi!
Ich versuche gerade UART mit DMA zum laufen zu bringen. Ich möchte die 
ankommenden Daten in den RAM schaufeln und danach den Interrupt 
auslösen.

Ich konfiguriere das DMA mit dieser Funktion:

void initDMA() {
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

  //USART Channel
  DMA_Cmd(DMA1_Channel5, DISABLE);
  DMA_DeInit(DMA1_Channel5);

  DMA_InitTypeDef dmaInitStruct;

  dmaInitStruct.DMA_M2M = DMA_M2M_Disable;
  dmaInitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
  dmaInitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
  dmaInitStruct.DMA_Mode = DMA_Mode_Normal;
  dmaInitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
  dmaInitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  dmaInitStruct.DMA_BufferSize = 16 * 32;
  dmaInitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
  dmaInitStruct.DMA_MemoryBaseAddr = (uint32_t) buffer;
  dmaInitStruct.DMA_PeripheralBaseAddr = (uint32_t) &(USART1->RDR);
  dmaInitStruct.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_Init(DMA1_Channel5, &dmaInitStruct);

  DMA_SetCurrDataCounter(DMA1_Channel5, 16 * 32);

  DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);

  NVIC_InitTypeDef nvicInitStruct;
  nvicInitStruct.NVIC_IRQChannel = DMA1_Channel4_5_6_7_IRQn;
  nvicInitStruct.NVIC_IRQChannelPriority = 1;
  nvicInitStruct.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&nvicInitStruct);

  DMA_ClearFlag(DMA1_FLAG_TC5);
  DMA_Cmd(DMA1_Channel5, ENABLE);
}

UART-Config:

void initUART() {
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

  USART_InitTypeDef uartInitStruct;
  uartInitStruct.USART_BaudRate = BAUD_RATE;
  uartInitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  uartInitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  uartInitStruct.USART_Parity = USART_Parity_No;
  uartInitStruct.USART_StopBits = USART_StopBits_1;
  uartInitStruct.USART_WordLength = USART_WordLength_8b;
  USART_Init(USART1, &uartInitStruct);

  //GPIO_AF_1 is used for USART1
  GPIO_PinAFConfig(UART_SPI_Port, UART_RX_PinSource, GPIO_AF_1);
  GPIO_PinAFConfig(UART_SPI_Port, UART_TX_PinSource, GPIO_AF_1);

  USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
/*/
  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

  NVIC_InitTypeDef nvicInitStruct;
  nvicInitStruct.NVIC_IRQChannel = USART1_IRQn;
  nvicInitStruct.NVIC_IRQChannelPriority = 1;
  nvicInitStruct.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&nvicInitStruct);
//*/
  USART_Cmd(USART1, ENABLE);
}

ISR:

void DMA1_Channel4_5_6_7_IRQHandler(){
  if (DMA_GetITStatus(DMA1_IT_TC5)) {
    DMA_Cmd(DMA1_Channel5, DISABLE);
    DMA_ClearFlag(DMA1_FLAG_TC5);
    DMA_ClearITPendingBit(DMA1_IT_TC5);
    bufferChanged = 1;
    currentBuffer = !currentBuffer;
    DMA1_Channel5 ->CMAR = (uint32_t) buffer[currentBuffer];
    DMA1_Channel5 ->CNDTR = 16 * 32;
    DMA_Cmd(DMA1_Channel5, ENABLE);
  }
}

Wenn ich aber Daten an das UART schicke kommt nie der Interrupt. Wenn 
ich DMA deaktiviere und den UART RXNE Interrupt aktiviere, wird dieser 
ausgelöst, sobald UART etwas empfängt, es kann also nicht am Signal 
liegen.
Seht ihr hier irgendeinen Konfigurationsfehler?

[Leon L. (leonelf)]

bump?

[Dr. Sommer (Gast)]

Leon L. schrieb:
> DMA_SetCurrDataCounter(DMA1_Channel5, 16 * 32);

Kann gerade nicht nachgucken, aber ich vermute das muss weg.

[Leon L. (leonelf)]

entfernen bringt nix.

[Leon L. (leonelf)]

bump