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Adventurer
Adventurer
4,312 Views
Registered: ‎08-21-2016

INVALID DAP ACK VALUE 7 ERROR

I am getting invalid dap error  while running the sdk code

can u please help me

 

 

DAPERROR.jpg
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8 Replies
Xilinx Employee
Xilinx Employee
4,291 Views
Registered: ‎07-23-2012

Re: INVALID DAP ACK VALUE 7 ERROR

The error means that the debugger is unable to get a valid response from the DAP (debug interface). This can occur if the jtag connection is not stable or if the DAP is disabled during debug. Few questions..

1. Do you see this error everytime when you run ps7_init?

2. Which version of SDK are you targeting? Can you please useps7_init from latest versions?

3. Have you tried to lower the jtag frequency? You can do this with the following commands in XSDB cli

connect [-url <url of the remote hw_server>]

jtag targets

jtag targets <id of the target representing jtag cable>  // this is typically 1

jtag frequency  // this will return the current frequency

jtag frequency <lower frequency>

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Adventurer
Adventurer
4,273 Views
Registered: ‎08-21-2016

Re: INVALID DAP ACK VALUE 7 ERROR

Thanks for the reply ,

ya I am getting the error all the time, even I have checked my previously working project, now there also I am getting same error.

I am working on SDK 15.3

I tried lowering the JTAG frequency to 10mhz ,still the same error

 

can u please help me

 

with regards

ramesh

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Xilinx Employee
Xilinx Employee
4,263 Views
Registered: ‎07-23-2012

Re: INVALID DAP ACK VALUE 7 ERROR

Can you please see if you are able to detect ARM in JTAG chain? You can use either XSDB or Vivado HW manager to check this.

By the way, are you targeting a custom board or one of Xilinx evaluation boards?
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Adventurer
Adventurer
4,255 Views
Registered: ‎08-21-2016

Re: INVALID DAP ACK VALUE 7 ERROR

HI,

 

YA , I AM ABLE TO DETECT THE JTAG  IN HW Manager . I am working on our customized board. ZYNQ 7020

 

 

WITH REGARDS

RAMESH

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Adventurer
Adventurer
4,254 Views
Registered: ‎08-21-2016

Re: INVALID DAP ACK VALUE 7 ERROR

and ya, I am able to detect the ARM .

 

 

WITH REGARDS

RAMESH

 

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Visitor jys_ee
Visitor
2,173 Views
Registered: ‎12-13-2017

Re: INVALID DAP ACK VALUE 7 ERROR

hello, RAMESH, could you share how you solved the problem?

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Visitor shenlu
Visitor
670 Views
Registered: ‎12-11-2018

Re: INVALID DAP ACK VALUE 7 ERROR

hello, do you solve the problem? could you share how you solved the problem?

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Visitor steveatlam
Visitor
226 Views
Registered: ‎09-21-2015

Re: INVALID DAP ACK VALUE 7 ERROR

I know this is an old thread, but here is how I fixed the issue: I reduced the JTAG clock speed. Once the clock speed was reduced from 30MHz to 3MHz, both downloading the FPGA image and running the application on the development board worked. I am using an Ultra96 board with the Avnet JTAG interface board. I also used Vivado 2017.4.

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