read data from DDR xilinx ML507

[elionidas]

Hi


I download a data file in DDR (ML507) and I want to read these data with C instruction
How can I do it ?


Best regards;

 

[treqer]

void DispMem(int addrMem)
{
xil_printf("addr=%08X mem=%08X\r\n",addrMem,*(int *)(addrMem));
}






DispMem(XPAR_DDR2_SDRAM_MEM_BASEADDR);

 

[elionidas]

hi treqer
thanks for your replay

I load a txt file to DDR2 widt xmd dow command.
My txt file is as follow
I follow your C function but I obtain a wrong value for the first data that is "5"
the result obtained is addr=00000000 mem= 00000011
!!!!!!
plz help, I used also XIO_IN8(DDR2_BaseAddress) and nothing

 

[treqer]

Are you sure that you address 0 data, not the software?
In terms of tire care about how to read. From BRAM read?

 

[elionidas]

I don't understand what mean " Are you sure that you address 0 data, not the software?"
and I want to read from DDR not from BRAM

I use addresses for loading and reading as indicated in the attached figure

 

[treqer]

it means nothing. When you create a sample project wizard asks "where is the program, stack, hip." Perhaps the address 0 is used in your system executable code.

I do not know much about programming - I have been doing digital part. Program writes a programmer who knows nothing about the digital part. Many of the program do not tell. See file compiler_options / linker_script

 

[elionidas]

thank for your replay

The program, heap and stack are in "xps_bram_if_cntlr_1"
the heap and the stack are the size of 1000 bytes

For the Heap and Stack, I must make the tab "memory" to DDR2_SDRAM_C_MEM_BASEADDRESS"?

 

[treqer]

Try to write itself

#define WriteReg(BaseAddress, RegOffset, Data) \
XIut32((BaseAddress) + (RegOffset), (Xuint32)(Data))



WriteReg(XPAR_ddr_BASEADDR, 0, data);


and more .... in zero addresses will be interrupt vector

 

[elionidas]

hi treqer

I used ReadReg and nothing
I obtained 17 instead of 5 for the first value in the address 0x00000000 !!!!!!
and when I change my file il SRAM for exemple, I obtained an other value such as 53
plz help me if you know what is the source of problem
thank

 

[treqer]

check that
1. read the first 10 memory at address 0.
2. record the first 10 memory at address 0
3. read the first 10 memory at address 0.

Do not forget that memory addressing byte. To read and write to 32 should be addressed to increase by 4.

 

[elionidas]

hi treqer

I do what you say
Before downloading the txt file in DDR2-SDRAM, I read the 10 first memory at address 0 like this:

        ReadReg(0x00000000,0,res1);
	xil_printf("data=%d\n",res1);
	ReadReg(0x00000000,4,res2);
	xil_printf("data=%d\n",res2);
	ReadReg(0x00000000,8,res3);
	xil_printf("data=%d\n",res3);
	ReadReg(0x00000000,12,res4);
	xil_printf("data=%d\n",res4);
	ReadReg(0x00000000,16,res5);
	xil_printf("data=%d\n",res5);
	ReadReg(0x00000000,20,res6);
	xil_printf("data=%d\n",res6);
	ReadReg(0x00000000,24,res7);
	xil_printf("data=%d\n",res7);
	ReadReg(0x00000000,28,res8);
	xil_printf("data=%d\n",res8);
	ReadReg(0x00000000,32,res9);
	xil_printf("data=%d\n",res9);
	ReadReg(0x00000000,36,res10);
	xil_printf("data=%d\n",res10);

and i obtain the same value that is "165".
however, when I download my file and I do the same instructions I obtained for the 3 first memory "53" , "32" and "32" !!!!

 

[treqer]

can be a problem in the position of bytes. big-endian little-Indian?

 

[elionidas]

hi treqer
Have you an other method to download the data file to the memory ? I think the problem is there

 

[treqer]

I'm not a programmer. I can only analyze the process of recording, if you describe the state of the first 10 memory cells. Before and after your download file. To do this, I am interested in the contents of the file.