Reading a file from external memory via System Console

[skon]

Hello,

My design captures images from an external video source and records them to DDR3.

In addition to my custom logic, I also have a Jtag to Avalog master connected the DDR3 controller (via Qsys).

Is it possible to save a section of the memory (representing a single image) into a file on my hard drive via System Console ?

[RParks]

I've done something similar so this might help:

proc DDR3_read_to_file {} {

  set imagefile [open "C:/Users/RParks/system_console/scripts/image_read.mem" w]

  # set imagefile [open "/root/system_console/scripts/image_read.mem" w]

  set read_data [<ddr_read_command> <addr> <length>]

  # puts $read_data

  puts $imagefile [format "%s" $read_data]

  close $imagefile

}

[skon]

Hi,

Thanks for the reply.

But where in your script do you specify the DDR3 address range that you want to be copied to the file ?

[RParks]

Hi, so my solution wasn't for DDR3 and you'd need to customise it for your system but in mine I wrote a separate proc <ddr_read_command> which took 2 arguments, the address and length.

The below might be a helpful starting point for you to write your own:

proc memory_rd_cmd {addr length} {

  variable claimed_path

  set readdata {}

  for {set i 0} {$i < $length} {incr i} {

    lappend readdata [master_read_32 $claimed_path [expr {$addr+$i}] 1]

  }

  return $readdata

}

[skon]

Thanks.

I'll try it.

I thought I'd easily find an online example for this exact scenario - but I can't.