JP1 Remotes Forum Index JP1 Remotes


FAQFAQ SearchSearch 7 days of topics7 Days MemberlistMemberlist UsergroupsUsergroups RegisterRegister
ProfileProfile Log in to check your private messagesLog in to check your private messages Log inLog in

What is the JP1

 
Post new topic   Reply to topic    JP1 Remotes Forum Index -> JP1 - Beginners
View previous topic :: View next topic  
Author Message
boxnut



Joined: 26 Jun 2007
Posts: 7

                    
PostPosted: Sun Nov 03, 2019 5:38 pm    Post subject: What is the JP1 Reply with quote

Perhaps some insight as to just what is this JP1 port.
"JP1" idenifies a plug used to define a port defined by the 'Joint Test Access Group' known as JTAG. A reduced serial pin configuration is called 'BDM' background debug module.
Manufacturers of JP1 remotes us this port to load and troubleshoot the firmware that makes these remotes tick. URC, Radio shack and such.
Wat this means for the remote tinkerer is this gives a gateway to reprogram codes and protocols not already on the remote.
The early interface was simple, connecting certain paralell port pins to JP1, then running software like remote master.
Newer interfaces use USB with a controller to into a USART, buffered to JP1
There are many such BDM interfaces to be found, from USB dongles, to more complex interfaces, usually available from a few dollars to as much as $30 that will work with JP1 remotes, these will need their certain drivers installed for your OS, then you are free to use all the remote software available.
Been quite a wile since playing with remotes and they have come a long way with BDM. Worst case is JTAG has no set standards for pinout functions, so up to the maker of the remote to define that, the signals and functions are all there though.
Once you understand this, it is really rather simple. Gets a bit more complicated when you work with smart oled UHDYV.
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 21211
Location: Chicago, IL

                    
PostPosted: Sun Nov 03, 2019 5:51 pm    Post subject: Reply with quote

What is the point of this post?
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
xnappo
Expert


Joined: 30 Dec 2003
Posts: 861

                    
PostPosted: Mon Nov 04, 2019 3:25 pm    Post subject: Reply with quote

This post hurts my brain. Seriously, it may be dangerous to read.
Back to top
View user's profile Send private message
MaskedMan
Tivo Expert


Joined: 10 Feb 2004
Posts: 1006
Location: Boone, IA

                    
PostPosted: Mon Nov 04, 2019 3:48 pm    Post subject: Reply with quote

Is this access group going to ask for royalties?
_________________
Edmund
Back to top
View user's profile Send private message
Barf
Expert


Joined: 24 Oct 2008
Posts: 1402
Location: Munich, Germany

                    
PostPosted: Mon Nov 04, 2019 5:03 pm    Post subject: Reply with quote

Applying for the position of "secretary of JP1" at the White House?
Back to top
View user's profile Send private message Send e-mail Visit poster's website
ckeays



Joined: 12 Jan 2015
Posts: 129
Location: Toronto, Ontario

                    
PostPosted: Mon Nov 04, 2019 9:31 pm    Post subject: Re: What is the JP1 Reply with quote

boxnut wrote:
"JP1" idenifies a plug used to define a port defined by the 'Joint Test Access Group' known as JTAG.
I don't think JP1 remotes are programmed using JTAG.
Back to top
View user's profile Send private message
boxnut



Joined: 26 Jun 2007
Posts: 7

                    
PostPosted: Mon Nov 04, 2019 11:01 pm    Post subject: Point Reply with quote

The Robman wrote:
What is the point of this post?

Back when I first started playing with remotes, I had no clue "what"JP1 was, what it did, and how it worked. This site taught me the basics, and taken it on my own from there. Learned the entire scope of joint test access group and its kin, Come a long ways and can at least give something to the forums.
Back to top
View user's profile Send private message
boxnut



Joined: 26 Jun 2007
Posts: 7

                    
PostPosted: Mon Nov 04, 2019 11:08 pm    Post subject: Reply with quote

MaskedMan wrote:
Is this access group going to ask for royalties?

No, just a group of engineers that forme some level of standardizing the 'tap' found on many of todays processors. Makes for a much faster testing method than visual or the "bed of nails" troublshooting PC boards or programming firmware.
Back to top
View user's profile Send private message
boxnut



Joined: 26 Jun 2007
Posts: 7

                    
PostPosted: Mon Nov 04, 2019 11:20 pm    Post subject: Re: What is the JP1 Reply with quote

ckeays wrote:
boxnut wrote:
"JP1" idenifies a plug used to define a port defined by the 'Joint Test Access Group' known as JTAG.
I don't think JP1 remotes are programmed using JTAG.
The folks like URC are a marketing for many programmable remotes made in Kore or China.
Off the assembly line they are a bunch of parts. The brain in these has a "TAP" test access port the makers DO program with JTAG and OEM SDK for the specific processor. The outside world is a 6 pin header labled 'JP1'.
Software such as found on this site gives access to to remote codes and protocols, and programming or adding to the factory codes.
Back to top
View user's profile Send private message
boxnut



Joined: 26 Jun 2007
Posts: 7

                    
PostPosted: Thu Nov 07, 2019 9:48 pm    Post subject: Reply with quote

Hi, I know this is an old post, but may be of some help.
The chip in this remote is what I take as overkill being an 'SOIC"
The radio just part of the system makes it a good radio remote.
Your JP1 is obviously working given you have any access to memory space.
A look at your file doesn't look like RDF, Possibly protocols for existing remotes(TVs)
RM/IR looks to eeprom space, internal or external for anything like RDF data.
Probably why this won't save as an RDF , but should save as a binary.
The core of this chip is 8051 with a few variants for eeprom and e2 space.
The 'TAP' called proprietary 2 wire in the data sheet still complies with JTAG and 2 of the needed 5 pin minimum for reading/writing to memory space and debugging.
Take a step up with JTAG software, should give yo every thing on and off chip. I played with a predecessor to this with a dish network remote with wireless. One would have to disassemble and trace the firmware to see just what your code does.
Hope this sheds a bit of light here.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic       JP1 Remotes Forum Index -> JP1 - Beginners All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


 

Powered by phpBB © 2001, 2005 phpBB Group
Top 7 Advantages of Playing Online Slots The Evolution of Remote Control