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LPC3250 DMA Interrupt Help

New! LPC3250 DMA Interrupt Help
eswar g

I'm facing problum while configuration for GPDMA. I was unable to generate interrupt on DMA.
here I'm listing
1.I configured DMA Channel 0 for UART2 for 4 bytes trigger. But unable to get.

2.What that channel linked list register will do?

I have studied the data sheet. But unable to get these things.

Please help me

Here i'm attaching the GPDMA configuration what i did.

GPDMA_SOFT_BREQ |=0x00000100;           // HSUART 2 TX  Selected
        GPDMA_CH0_SRC    =HSU2_RX;      // Selecting Source address
        GPDMA_CH0_DEST   =(unsigned long)&Rx_Buffer_485[0];
        GPDMA_CH0_LLI    =0x00000000;
        GPDMA_CH0_CTRL   = 0x88009001;          // Terminal count interrupt and
                                                //transfer size 4byts(8bits wide)
        GPDMA_CH0_CFG    |=0x00001008;          // Peripheral to memory trnasaction
        GPDMA_CONFIG     |=0x00000001;          // Enable DMA Controller

Thanks
Eswar

0 eswar g over 13 years ago

Hi all

I'm trying to transmit data through DMA. i was able to get interrupt and transfer the data.
but the data was junk coming. Here is my configuration

         DMACLK_CTRL    |=0x00000001;           // enable all DMA Clocks
        GPDMA_CH0_SRC    =(unsigned long)Tx_Buffer_485[0];
        GPDMA_CH0_DEST   =0x40018000;              // HSUART2_TX address
        GPDMA_CH0_LLI    =0x00000000;
        GPDMA_CH0_CTRL       =0x85492002;    // 32 bit wide 8byte


        GPDMA_CONFIG     |=0x00000001;          // Enable DMA Controller
        GPDMA_CH0_CFG    |=0x000009C1;          // memory  to Peripheraltrnasaction

i'm using HSUART2 to transfer data. Source is memory. and destination is HSUART2 Tx
My source burst size is8 bytes
destination burst size is 8 bytes
Source and destination width is 32bit wide
and transfer size is 2

        for(i=0;i<8;i++)
        {
                Tx_Buffer_485[i]=0x38;
        }

like above i filled the buffer.

aim: Transfer the data of 8 bytes from pheripheral to memory.

anyone can please help me on this configuration

thanks
eswar

0 eswar g over 13 years ago in reply to eswar g
Hi all by small correction for above post i'm posting again

aim :Transfer the data of 8 bytes from memory to pheripheral.

I'm trying to transmit data through DMA. i was able to get interrupt and transfer the data.
but the data was junk coming. Here is my configuration

DMACLK_CTRL |=0x00000001; // enable all DMA Clocks GPDMA_CH0_SRC =(unsigned long)Tx_Buffer_485[0]; GPDMA_CH0_DEST =0x40018000; // HSUART2_TX address GPDMA_CH0_LLI =0x00000000; GPDMA_CH0_CTRL =0x85492002; // 32 bit wide 8byte GPDMA_CONFIG |=0x00000001; // Enable DMA Controller GPDMA_CH0_CFG |=0x000009C1; // memory to Peripheraltrnasaction

i'm using HSUART2 to transfer data. Source is memory. and destination is HSUART2 Tx
My source burst size is8 bytes
destination burst size is 8 bytes
Source and destination width is 32bit wide
and transfer size is 2

for(i=0;i<8;i++) { Tx_Buffer_485[i]=0x38; }

like above i filled the buffer.

anyone can please help me on this configuration

thanks
eswar
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