S3C8 OpCode

Ironbreeze · Post by **Ironbreeze** » Wed Jun 16, 2004 9:12 am

I discovered the world of JP1 four days ago, and man has it made an impact. It allowed me to do what I needed/wanted to be done with a $31 remote instead of the $100+ remotes. But now I have bags under my eyes from staying up to the wee hours of the morning learning all the cool things that can be done, my wife is threatening to leave me because "I love the remote more than her." etc... So first off, a thanks goes out to all you jp1 pioneers... seriously, this is very cool stuff.
Ok, on to my question...
I'm attempting to write my own protocol (custom extender), I need to load a register with a relative address (relative to the current execution point). I'm looking at the SC38-instruction-set doc, but can't seem to find the opcode that would allow me to do this. Worse case scenerario (i.e. more instructions) would be to get the pc (program counter) or the ip (instruction pointer) and move that to the src register then sub the desired relative offset. But one, I'm not clear on the difference between the IP and the CP (which do I want?), and 2 I'm not sure how to access either of their values.
Can any of you geeks out there help a fellow geek out?

Thanks

johnsfine · Post by **johnsfine** » Wed Jun 16, 2004 10:56 am

What are you using for an assembler? Are you using the S3C8asm that I wrote?

You shouldn't be computing a relative address like that at run time. A protocol is always loaded into the same place (in ram) to be executed, so the address wouldn't vary. The assembler supports expressions that cand be used to compute the relative address.

Ironbreeze · Post by **Ironbreeze** » Wed Jun 16, 2004 11:40 am

Actually I'm not using the assembler, but have it. Kudos for taking the time to write one. I will most definately use it for future development.
But for right now I'm just hand coding the op codes into IR. Here's the jist of what I'm trying to do...
I'm attempting to write a protocol that will allow me to display a custom message on the LCD. For my first pass this will simply be a fixed message of my choosing. BTW, this is for the RS15-2116. The code so far looks like this.

Code: Select all

FF00:        00 00           DB    00H, 00H
FF02:        01              DB    01H
FF03:        8B 10           JR	 FF15H        //jump over message data
FF05:        00 00           DEC	R00            //custom message data starts here
FF07:        00 00           DEC	R00
FF09:        00 00           DEC	R00
FF0B:        00 00           DEC	R00
FF0D:        00 00           DEC	R00
FF0F:        00 00           DEC	R00
FF11:        00 00           DEC	R00
FF13:        00 00           DEC	R00
FF15:        C6 C4 FF 05     LDW   RC4, #FF05H  //Load message address into display register
FF19:        E6 92 00        LD    R92, #00H    //clear icons
FF1C:        F6 0E B0        CALL  0EB0H        //call LCD display function
FF1F:        AF              RET

where FF05 will be used as the storage space for the message. But when IR uploads this to the remote, then it won't really be address FF05, correct? So thats why I'm looking for a relative postion to the current executing instruction, as opposed to the direct address pointer of the C6 C4 FF 05 command.
Or, does IR by some chance take care of calculating the true (eventual) address of FF05? It kinda occurred to me that this might be the case, since protocols can and do move in the eeprom Raw Data if I were to delete a protocol preceeding it.
I may be going about this all wrong. As mentioned earlier, I'm a bit sleep deprived at the moment.

johnsfine · Post by **johnsfine** » Wed Jun 16, 2004 11:48 am

Ironbreeze wrote: where FF05 will be used as the storage space for the message. But when IR uploads this to the remote, then it won't really be address FF05, correct?

When that protocol executes that data will be at address FF05.

IR loads it into the eeprom, which is not in the remote's address space at all. Each time the remote uses the protocol, it copies the protocol from eeprom to ram. It always will be loaded at the beginning of ram, which in that model is FF00.

Ironbreeze · Post by **Ironbreeze** » Wed Jun 16, 2004 11:51 am

oooohhhh, I see now. That sure makes life alot simpler. Thank you.

Post by **The Robman** » Wed Jun 16, 2004 12:03 pm

Just FYI, someone once wrote an executor that displays custom messages on the screen of an RCU810 remote, which might make for interesting reading for you, here it is: RCU810KCU.zip

This particular upgrade relies on the data in the EEPROM being where it's supposed to be because the executor overlays itself with data from the EEPROM.

pH7_jp1 · Post by **pH7_jp1** » Wed Jun 16, 2004 12:08 pm

Another FYI, the 2116 extender already supports custom text on the LCD, so you shouldn't have to write any code of your own - unless of course that is the whole purpose (to write your own code).

Ironbreeze · Post by **Ironbreeze** » Wed Jun 16, 2004 12:30 pm

Thanks Robman, I grabbed a copy of it and I'll definately check it out. So much to learn and so little time.

pH7-jp1,
That brings me to another thing I'm a bit confused on. I've downloaded the 2117/2116 extender from the yahoo files section, and have it installed. But unless I'm not understanding something it appears to be the 2116 Extender 1 which from what I can tell doesn't have a method to display custom messages, except the LCD_SAT, LCD_DVD, etc keys. But, I've seen numerous post of peeps saying they have the 2116 Ext 2 installed. Where can I get the 2116 Extender 2? Or do I already have the right files and just need to do something to enable the extnder 2 functionality. Sorry if this is a stupid question, if it is I'm falling back on the sleep deprived excuse.

unless of course that is the whole purpose (to write your own code).

Writing my own is definately a big part of the fun in all this. Practicality has been passed at this point (my remote does everything I could have expected one remote to do). The rest is just for fun and the whole "Oh neat" aspect.

Nils_Ekberg · Post by **Nils_Ekberg** » Wed Jun 16, 2004 1:03 pm

Both 2116/2117 extenders version 1 and 2 are in the same folder where you got version 1.

If you want the LCD functionality from the extender you need to install version 2 because the custom LCD is not in version 1 at all.

Ironbreeze · Post by **Ironbreeze** » Wed Jun 16, 2004 1:18 pm

Ok, I dl'd the ext 1 file a couple days ago, and I missed the second one completely, and I wasn't sleep deprived at that point.

Thanks Nil
There may be no such thing as a stupid question, but the intelligence of the source of my last question is debatable.

Ironbreeze · Post by **Ironbreeze** » Thu Jun 17, 2004 7:53 am

I got a chance to install the Ext 2 in my remote last night. The custom LCD protocol does everything I was hoping to get mine to do, and a whole lot more efficient than I could ever expect mine to be.
So, to whoever writes these extenders, I'm impressed, and thanks for taking the time to do them.

Post by **The Robman** » Thu Jun 17, 2004 8:39 am

Hey IB, while you may have already got your remote to do what you were hoping to make it do, don't let that stop you from getting into the S3C8 code a bit deeper. Who knows what else you might want to make the remote do that it currently can't, there's always room for more hackers.

Ironbreeze · Post by **Ironbreeze** » Thu Jun 17, 2004 9:11 am

You bet. Being that I'm on day 6 of learning this new world of JP1, I haven't really come up with any original ideas that someone here hasn't already come up with. But give me time, I'm sure I'll come up with something and start to play with it some. Now whether the idea has any actual practicality is another matter

.
On another note, I'm fluent in Delphi. We've used it here (the software company I work for) to develop our product since the Delphi 2 days, but just recently switched to C# for all new development, due to consolidation of various companies in our field. IOW, a bunch of us competitors were bought up to make one larger company and that led to a handful of different development teams all programming in different languages. So we got together and decided C# (.net) would be what we all would adopt and use from that point forward.
So anyway, I have Delphi 7 and could probably be of more help there if the need arises. Particularly seeing that you guys could run circles around me in the S3C8 arena (for the time being

). Is the Delphi/IR an area that could use another chef, or are there already enough in the kitchen?

If my services could be used, I've only been able to locate the IR 4.01 source, is the newer source available?

Thanks,
IB

Edit:
Of course currently I have more jp1 questions than answers, so I doubt I'll be of much help any time soon. That realization kinda hit me after reading a post on an IR request (three times), and still didn't understand it completely

. "The What and Why of JP-1" has been instrumental in helping me understand the data formats, but I've still a long ways to go. As you can probably gather, I'm eager to contribute and looking forward to the point that I can.