Link Port

[SirCmpwn]

Hello,
How do I access the link port on the Nspire?  It's documented here: http://hackspire.unsads.com/wiki/index.php/Memory-mapped_I/O_ports#90100000_-_TI-84_Plus_link_port, but this doesn't seem to work.

[SirCmpwn]

*bump*

[ExtendeD]

I suppose currently only calc84maniac or Goplat have any knowledge on this.

[DJ Omnimaga]

I think even Calc84maniac doesn't, but again, I could be wrong. Maybe you might have more luck with Goplat.

[t0xic_kitt3n]

I guess it would mean you read/write those memory locations to control the port, like it said. INitilaize a pointer to it, and then modify the value. Haven't tried anything with it, though.

[SirCmpwn]

Well, at that point, I didn't know how to access the TI-84+ link port through ARM assembly. Now I do, but I no longer have the source code for the TI-83+ emulator.

Now I'm just hoping he notices

[DJ Omnimaga]

Oh, I thought he kinda moved on from the idea for a while or was still working on it. I knew about his lost source code, though.

[SirCmpwn]

Calc84maniac and I were chatting last knight about how to fix this, and this is how you do both of our issues:
Access the link port:
To enable the link port, OR the value at 0x900A0000 with 0x20.
To disable, AND the same value with ~0x20.
Change the first two bits of 0x90100000 to reflect the state of the ring and tip, respectively.
Interrupts:
Back up the value at 0x38 first.
Load your own interrupt function into 0x38 by using &functionname to get a pointer to it.
Restore 0x38 upon leaving.

[calc84maniac]

Access the link port:
To enable the link port, OR the value at 0x900A0000 with 0x20.
To disable, AND the same value with ~0x20.

Actually, that should be 0x900A0004. That could explain why nothing was happening.

[SirCmpwn]

That would be a great explanation

[DJ Omnimaga]

This is to use the I/O link port when in Nspire mode, after swapping the keypads, right? Has anyone gotten any success with the USB?

[SirCmpwn]

I haven't tried USB, and this is intended to use the I/O port on an 84+ keypad.
okay...
Sounds weird but I'll go with it.
I got sound to work now, it plays a tone, and pressing up and down on the keypad changes the tone.
The following code should play some sort of noise, but it only plays a high pitched tone:

Code: Select All | Copy To Clipboard

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int main(void) { enableLink(); clearScreen(); FILE* wavFile = fopen("HBFS.wav", "r"); char currentSampleLeft, currentSampleRight; while (!isKeyPressed(KEY_84_ENTER)) { } while (!isKeyPressed(KEY_NSPIRE_ESC) && !isKeyPressed(KEY_84_CLEAR)) { fread(&currentSampleLeft, 1, 1, wavFile); fread(&currentSampleRight, 1, 1, wavFile); int count; for (count = 0; count <= 0xFF; count++) { int value = 0; if (count < currentSampleLeft) { value++; } if (count < currentSampleRight) { value += 2; } KEYPAD_84_IO = value; } } fclose(wavFile); disableLink(); return 0; } void enableLink() { MISC_PORTS |= 0x20; } void disableLink() { MISC_PORTS &= ~0x20; }

Any ideas?

[DJ Omnimaga]

Oh wow you're trying to get sound to work? O.o

I hope you can get it figured out. Hopefully someone will be able to help soon.

[SirCmpwn]

Well, right now what I have is static with the faintest inklings of the occasional tone, so I have a long way to go.

[DJ Omnimaga]

Yeah I know. I hope you can eventually manipulate sound and stuff, even if it's just to produce sound like this : http://www.youtube.com/watch?v=yXI1r2nG0-M