Lpc2000

Hi Gus,

I am interested in writing some code for the JTAG, but i do not know 
the hardware configuration to use. Can i use the USB JLink IAR JTAG 
that i have, or i will have to use a JTAG on the parallel port. 

If possible then please tell me something about ur project hardware 
and some idea of how i can go about writing some code for the JTAG.

Regards,
Jerome

--- In lpc2000@yahoogroups.com, "Gus" <gus_is_working@...> wrote:
>
> Hello,
> 
> I am writing my own code to do JATG on LPC chips. In Shift-IR 
state, I 
> am able to select any one of the JTAG commands and I get back 0001 
as 
> the ARM manual says. IDCODE and BYPASS work just fine when I 
> read/write data in Shift-DR state.
> 
> Now, When I want to select a chain using SCAN_N command, I get 
0001 in 
> Shift-IR state as the manual says but in the Shift-DR state I do 
not 
> get back 1000!
> 
> Is there anything I should do before SCAN_N?
> Is anyone able to write SCAN_N Shift-DR and got back 1000?
> 
> Thanks,
> 
> Gus
>