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:
1 | void initDMA() {
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2 | RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
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3 |
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4 | //USART Channel
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5 | DMA_Cmd(DMA1_Channel5, DISABLE);
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6 | DMA_DeInit(DMA1_Channel5);
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7 |
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8 | DMA_InitTypeDef dmaInitStruct;
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9 |
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10 | dmaInitStruct.DMA_M2M = DMA_M2M_Disable;
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11 | dmaInitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
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12 | dmaInitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
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13 | dmaInitStruct.DMA_Mode = DMA_Mode_Normal;
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14 | dmaInitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
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15 | dmaInitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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16 | dmaInitStruct.DMA_BufferSize = 16 * 32;
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17 | dmaInitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
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18 | dmaInitStruct.DMA_MemoryBaseAddr = (uint32_t) buffer;
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19 | dmaInitStruct.DMA_PeripheralBaseAddr = (uint32_t) &(USART1->RDR);
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20 | dmaInitStruct.DMA_Priority = DMA_Priority_VeryHigh;
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21 | DMA_Init(DMA1_Channel5, &dmaInitStruct);
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22 |
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23 | DMA_SetCurrDataCounter(DMA1_Channel5, 16 * 32);
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24 |
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25 | DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
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26 |
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27 | NVIC_InitTypeDef nvicInitStruct;
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28 | nvicInitStruct.NVIC_IRQChannel = DMA1_Channel4_5_6_7_IRQn;
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29 | nvicInitStruct.NVIC_IRQChannelPriority = 1;
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30 | nvicInitStruct.NVIC_IRQChannelCmd = ENABLE;
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31 | NVIC_Init(&nvicInitStruct);
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32 |
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33 | DMA_ClearFlag(DMA1_FLAG_TC5);
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34 | DMA_Cmd(DMA1_Channel5, ENABLE);
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35 | }
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UART-Config:
1 | void initUART() {
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2 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
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3 |
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4 | USART_InitTypeDef uartInitStruct;
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5 | uartInitStruct.USART_BaudRate = BAUD_RATE;
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6 | uartInitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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7 | uartInitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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8 | uartInitStruct.USART_Parity = USART_Parity_No;
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9 | uartInitStruct.USART_StopBits = USART_StopBits_1;
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10 | uartInitStruct.USART_WordLength = USART_WordLength_8b;
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11 | USART_Init(USART1, &uartInitStruct);
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12 |
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13 | //GPIO_AF_1 is used for USART1
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14 | GPIO_PinAFConfig(UART_SPI_Port, UART_RX_PinSource, GPIO_AF_1);
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15 | GPIO_PinAFConfig(UART_SPI_Port, UART_TX_PinSource, GPIO_AF_1);
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16 |
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17 | USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
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18 | /*/
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19 | USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
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20 |
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21 | NVIC_InitTypeDef nvicInitStruct;
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22 | nvicInitStruct.NVIC_IRQChannel = USART1_IRQn;
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23 | nvicInitStruct.NVIC_IRQChannelPriority = 1;
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24 | nvicInitStruct.NVIC_IRQChannelCmd = ENABLE;
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25 | NVIC_Init(&nvicInitStruct);
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26 | //*/
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27 | USART_Cmd(USART1, ENABLE);
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28 | }
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ISR:
1 | void DMA1_Channel4_5_6_7_IRQHandler(){
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2 | if (DMA_GetITStatus(DMA1_IT_TC5)) {
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3 | DMA_Cmd(DMA1_Channel5, DISABLE);
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4 | DMA_ClearFlag(DMA1_FLAG_TC5);
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5 | DMA_ClearITPendingBit(DMA1_IT_TC5);
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6 | bufferChanged = 1;
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7 | currentBuffer = !currentBuffer;
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8 | DMA1_Channel5 ->CMAR = (uint32_t) buffer[currentBuffer];
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9 | DMA1_Channel5 ->CNDTR = 16 * 32;
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10 | DMA_Cmd(DMA1_Channel5, ENABLE);
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11 | }
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12 | }
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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?
