Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

[SOLVED] Access BRAM from PS

Status
Not open for further replies.

aminpix

Advanced Member level 4
Joined
Sep 30, 2008
Messages
108
Helped
2
Reputation
4
Reaction score
2
Trophy points
1,298
Activity points
2,339
I have a zynq FPGA and I am trying to read a file from MicroSD, then write the file into the BRAM of the FPGA and do some process on them in PL side of the Zynq.
I can read and write to the BRAM from PL side.
The block diagram is like this:

Screenshot from 2023-02-22 04-03-32.png


and my PS code is this:


Code:
#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
#include "xparameters.h"

int main()
{
    init_platform();
    UINTPTR ADRS1 ;
    u32 din ;
    int i ;
    ADRS1 = XPAR_BRAM_0_BASEADDR ;
    while (1)
    {
        usleep(1000000);
        for (i=0;i<50;i++)
        {
            din = *((uint32_t *)(ADRS1 + i));  //(uint32_t)*(ADRS1+i);
            printf("val %i:  %lu \n\r",i, din);
        }
    }



Now, I just want to read BRAM from PS (and next step will be write into the BRAM).

What is wrong with my code?
 

Solution
I found the solution for my problem:

  • 1) AXI_BRAM_CNT should have one controller not two.
  • 2) The BRAM address (ADRS1) should increase by 4 not 1
  • 3) Xil_In32(ADRS1); was the correct way of reading from BRAM.
  • 4) I can use u64 instead of UINTPTR
In principle...
1. The BRAM needs to have an AXI wrapper module or maybe an AXI BRAM Controller (if such a thing exists within Xilinx).
2. This AXI-BRAM then needs to be connected to the AXI Interconnect module (the interface between PS and PL) as a slave.
3. You can write C code for the ARM core that will be able R/W the BRAM over the AXI.

There should be help available on how to do it in details. You search word needs to be "Accessing BRAM from PS + Zynq"
 

I found the solution for my problem:

  • 1) AXI_BRAM_CNT should have one controller not two.
  • 2) The BRAM address (ADRS1) should increase by 4 not 1
  • 3) Xil_In32(ADRS1); was the correct way of reading from BRAM.
  • 4) I can use u64 instead of UINTPTR
 

Solution
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top