Hi,
I'm trying to use a XPS central DMA. Actually i connected it to the same PLB that my PPC440 and all other peripherals. I first try to do a simple write and read from BRAM to BRAM. bellow my code :
int x;
XDmaCentral mdma;
//XDmaCentral_SelfTest(&mdma);
x=XDmaCentral_Initialize(&mdma,0);
if (x != XST_SUCCESS)
{
xil_printf("Error Initialize \n\r");
return (XST_FAILURE);
}
XDmaCentral_Reset(&mdma);
XDmaCentral_SetControl(&mdma, XDMC_DMACR_SOURCE_INCR_MASK | XDMC_DMACR_DEST_INCR_MASK);
static u32 data[2]= {0x00000000,0x00000000};
static u32 data_0[2]= {0xabababab,0xecececec};
u32 len=2;
u32 RegValue;
xil_printf("data : 0x%08X\n\r", data);
xil_printf("data_0 : 0x%08X\n\r", data_0);
XGpio_mWriteReg((void*)data,0,0xDEAD0011);
xil_printf("DPRAMREAD : 0x%08X\n\r",XGpio_mReadReg((void*)data,0));
XDmaCentral_Transfer(&mdma,(void*)data_0,(void*)data,len);
xil_printf("DMA_DA : 0x%08X\n\r", XDmaCentral_GetDestAddress(&mdma));
xil_printf("DMA_SA : 0x%08X\n\r", XDmaCentral_GetSrcAddress(&mdma));
xil_printf("DMA_DMACR : 0x%08X\n\r", XDmaCentral_GetControl(&mdma));
xil_printf("DMA_DMASR : 0x%08X\n\r", XDmaCentral_GetStatus(&mdma));
xil_printf("DMA_ISR : 0x%08X\n\r", XDmaCentral_InterruptStatusGet(&mdma));
do
{
RegValue = XDmaCentral_GetStatus( &mdma );
xil_printf("regvalue_reset:%x \n\r",RegValue);
} while ((RegValue & XDMC_DMASR_BUSY_MASK) == XDMC_DMASR_BUSY_MASK);
if (RegValue & ((XDMC_DMASR_BUS_ERROR_MASK)| XDMC_DMASR_BUS_TIMEOUT_MASK))
{
xil_printf("entered error or timeout branch \n\r");
XDmaCentral_Reset( &mdma );
return XST_FAILURE;
}
int i=0;
while(i<2)
{
xil_printf("data_dam : %x\n\r", data[i]);
i++;
}
I have no error, everything seems to be ok, the status register say that the DMA is done but if i read the place where DMA should have been write data nothing is written.
In order to be sure that addresses on BRAM are available, i wrote by hand at the first address (0xDEAD0011) and then when i red data (data_dam) i see my "0xDEAD0011" but the next data is 0x00000000.
So why do i get no error but the DMA seems to not do his job ????
here a copy of my UART output after a try :
data : 0xFFFDDB48
data_0 : 0xFFFDD50C
DPRAMREAD : 0xDEAD0011
DMA_DA : 0xFFFDDB4A
DMA_SA : 0xFFFDD50E
DMA_DMACR : 0xC0000000
DMA_DMASR : 0x00000000
DMA_ISR : 0x00000001
regvalue_reset:0
data_dam : DEAD0011
data_dam : 0
Thank you
