UART0_RX DMA and FIFO

mbeakes · ‎2007-03-05

Posted on March 05, 2007 at 16:12

mbeakes · ‎2011-05-17

Posted on May 17, 2011 at 09:39

Hi, I am currently trying to set DMA to receive with UART FIFO. At the moment, i am able to receive bytes and store it in my buffer (with DMA) :p .

I would like to reset my buffer pointer after each reception and notify the main App to check the buffer for new data. Where can I do this ? In the DMA interrupt, UART interrupt. I try to set a DMA interrupt without success.

Help would be appreciated

Code:

DMA_StructInit(&DMA_InitStruct);

DMA_InitStruct.DMA_Channel_LLstItm = 0; DMA_InitStruct.DMA_Channel_SrcAdd =(u32)(&UART0->DR);

DMA_InitStruct.DMA_Channel_DesAdd =(u32)(&RxBuffer[0]);

DMA_InitStruct.DMA_Channel_DesWidth=64;

DMA_InitStruct.DMA_Channel_SrcWidth=16;

DMA_InitStruct.DMA_Channel_SrcBstSize = DMA_DesBst_8Data ;

DMA_InitStruct.DMA_Channel_FlowCntrl = DMA_FlowCntrl_Perip2;

DMA_InitStruct.DMA_Channel_Src = DMA_SRC_UART0_RX; DMA_ChannelSRCIncConfig (DMA_UART0_RX_CHANNEL, DISABLE);

DMA_ChannelDESIncConfig (DMA_UART0_RX_CHANNEL, ENABLE);

/* clear all pending interrupt before init */

DMA_ClearIT(Channel6,DMA_TCC);

DMA_ClearIT(Channel6,DMA_EC);

DMA_Init(DMA_UART0_RX_CHANNEL,&DMA_InitStruct);

DMA_ITConfig(DMA_UART0_RX_CHANNEL, ENABLE);

/*Enable the TCI interrupt for channel0*/

DMA_ITMaskConfig(DMA_UART0_RX_CHANNEL, DMA_ITMask_ITC, ENABLE);

DMA_ITMaskConfig(DMA_UART0_RX_CHANNEL, DMA_ITMask_IE, DISABLE);

/* Update the DMA channel0 registers with the structure*/

DMA_ChannelCmd (DMA_UART0_RX_CHANNEL, ENABLE);

Here is my VIC config in my main App.

Code:

DMA_ClearIT(Channel0,DMA_TCC); // CLEAR OC flag for next interrupt

VIC_Config(DMA_ITLine, VIC_IRQ, 3);

VIC_ITCmd(DMA_ITLine, ENABLE);

UART_ClearITPendingBit(UART0,UART_IT_ReceiveTimeOut);

UART_ClearITPendingBit(UART0,UART_IT_Receive);

VIC_Config(UART0_ITLine, VIC_IRQ, 3);

VIC_ITCmd(UART0_ITLine, ENABLE);

Here is my UART config

void UART_Configuration(void)

{

UART_InitTypeDef UART_InitStructure;

UART_InitStructure.UART_WordLength = UART_WordLength_7D;

UART_InitStructure.UART_StopBits = UART_StopBits_2;

UART_InitStructure.UART_Parity = UART_Parity_No ;

UART_InitStructure.UART_BaudRate = 115200;

UART_InitStructure.UART_HardwareFlowControl = UART_HardwareFlowControl_None;

UART_InitStructure.UART_Mode = UART_Mode_Tx_Rx;

UART_InitStructure.UART_FIFO = UART_FIFO_Enable;

UART_InitStructure.UART_TxFIFOLevel = UART_FIFOLevel_1_2; /* FIFO size 16 bytes, FIFO level 8 bytes */

UART_InitStructure.UART_RxFIFOLevel = UART_FIFOLevel_1_8; /* FIFO size 16 bytes, FIFO level 8 bytes */

UART_DeInit(UART0);

UART_Init(UART0, &UART_InitStructure);

/* -------Enable the DMA request for the Tx FIFO */

UART_DMACmd(UART0, UART_DMAReq_Tx , ENABLE);

/* -------Enable the DMA request for the Tx FIFO */

UART_DMACmd(UART0, UART_DMAReq_Rx , ENABLE);

/* Enable interrupt for UART0 */

UART_ITConfig(UART0,UART_IT_Receive,ENABLE);

UART_ITConfig(UART0,UART_IT_ReceiveTimeOut,ENABLE);

/* Enable the UART0 */

UART_Cmd(UART0, ENABLE);

}