how to get DMA work

lpcware — Wed, 15 Jun 2016 18:29:52 GMT

Content originally posted in LPCWare by taker on Thu Oct 02 06:01:09 MST 2014



/*D*/ uint32_t dummy_send[2] = {0x12345,0x343424};
/*D*/ uint32_t dummy_receiver[2] = {0};



LPC_SC->PCONP |= (1 << 29); // enable DMA power
LPC_SC->DMAREQSEL |= (1<<1); // source  Timer0  


LPC_GPDMA->IntTCClear = (1<<1);
LPC_GPDMA->IntErrClr =(1<<1);
    
    
    //NVIC_EnableIRQ (DMA_IRQn);
LPC_GPDMA->Sync |= 0; //syncing DMA channel ( 1- disable)
    LPC_GPDMA->Config = (1<<0); //b0- enables DMA module/ b1=0 little endian                        

LPC_GPDMACH[GPDMA_CHANNEL1]->CSrcAddr = (uint32_t) &dummy_send[0];
    LPC_GPDMACH[GPDMA_CHANNEL1]->CDestAddr = (uint32_t) &dummy_receiver[0];//&LPC_GPIO1->PIN;
LPC_GPDMACH[GPDMA_CHANNEL1]->CLLI = 0;
    LPC_GPDMACH[GPDMA_CHANNEL1]->CControl = 
(2<< 11)  //data size
     |(1<< 12) //Source burst size
     |(1 << 15) //Destination burst size
     |(2 << 18) //Source transfer width
     |(2 << 21) //Destination transfer width
     |(0 << 26) //Source increment
     |(0 << 27) //Destination increment
|(1 << 31);//count interrupt is enable
    
    
    LPC_GPDMACH[GPDMA_CHANNEL1]->CConfig = (0<<0) //channel enabled  
                                            |(0 << 1)//source peripherial
                                            |(0 << 6)//dest peripherial
                                            |(0<<11)//transfer type
                                            |(0<<14)//int error
                                            |(0<<15)//terminal count mask                                            
                                            |(0<<17) // fifo has data
                                            |(0<<18); // disable dma requests


LPC_GPDMACH[GPDMA_CHANNEL1]->CConfig |= (1<<0); //enable

what else should I set to get this device working?

Re: how to get DMA work

lpcware — Wed, 15 Jun 2016 18:29:53 GMT

Content originally posted in LPCWare by xianghuiwang on Wed Mar 25 18:38:19 MST 2015
There are a simple DMA example Flash2Ram in this software package:
http://www.lpcware.com/content/nxpfile/lpc407x-and-lpc408x-cmsis-compliant-standard-peripheral-firmware-driver-library-keil
regards,

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how to get DMA work

Re: how to get DMA work