Tutorial: Using the USB-Blaster as an SOPC/Qsys Avalon-MM master

Hi Dave,

I integrated JTAG to Avalon MM Master bridge in to my design and tried write-read memories (implemented as Avalon Slaves) with the Client-Server scripts that you have provided.

(Using Centos 5.9 and Quartus 16.0)

I could start the server with

% quartus_stp -t jtag_server.tcl

Opened another tab

% gcc -Wall -o jtag_client jtag_client.c

% ./jtag_client -w 0x0000 -d 0x12345678

(SRAM sits on 0x0000)

It shows me following messages on client side:

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[svaishampayan@dev01 jtag_client_server]$ ./jtag_client -w 0x0000 -d 0x12345678

Connect to server localhost:2540

JTAG write (address, data) = (0x00000000, 0x12345678)

[svaishampayan@dev01 jtag_client_server]$

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On Server side:

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JTAG: USB-BlasterII [USB 1-3.1], FPGA: @1: 10AT115S(1|2) (0x02E060DD)

Start the server on port 2540

Wait for clients

Accept sock2aaaab339790 from 127.0.0.1 port 56979

Handle the client via a fileevent callback

SERVER (sock2aaaab339790): jtag_write 0x00000000 0x12345678

SERVER: jtag_write 0x00000000 0x12345678

SERVER (sock2aaaab339790): Invalid command from the client

SERVER (sock2aaaab339790): empty command

SERVER (sock2aaaab339790): disconnected

[svaishampayan@dev01 jtag_client_server]$

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Could you please explain why it is saying "Invalid command from the client"?

Thanks in anticipation!

Regards

Sagar.