Re: Sending AVRCP Commands
Re: Sending AVRCP Commands
- Subject: Re: Sending AVRCP Commands
- From: Roman Pixell <email@hidden>
- Date: Tue, 8 Sep 2009 10:12:53 +0200
dear josh,
i think that so far, there is not a single A2DP/AVRCP headset that is
fully compatible with OS X or iphone for that matter. at least i didnt
hear about ANY headset hat gives you full compatibility. right now,
the music pauses only if you take an incoming phone call. the music is
then resumed after hanging up.
/ ®
On 8 sep 2009, at 04.36, Joshua Brickner wrote:
I'm trying to learn how to write commands to a bluetooth device
using the IOBluetooth framework. I've gotten as far as discovering,
pairing, and connecting with the device. I'm at the point where I
have an L2CAP channel open and I'm using - (IOReturn)writeSync:(void
*)data length:(UInt16)length; to send data.
My problem is figuring how to send the specific command that I want.
I'm using the AVRCP profile, and the device I'm working with is a
media player. For starters I just want to send a play command. From
reading the spec for AVRCP I'm pretty sure that this example is what
I'm going for: http://imgur.com/K9uUG.png
Here is the code I have so far, but it doesn't seem to work. The
data goes through and I get back a seemingly random set of data
(usually something like: 0x480010) Can anyone give me some pointers?
I haven't had much experience with this lower level C stuff such as
hex and the like, but I'm eager to learn.
- (IBAction) play:(id)sender {
IOReturn ret;
int i;
const char data[5] = {0x00, 0x48, 0x7C, 0x44, 0x00};
unsigned int length = 5;
unsigned char buf[5];
memset(buf,0,5);
memcpy(buf, data, length);
printf ("send=:", length);
for(i=0 ; i<length ; i++) {
printf(" X", buf[i]);
}
printf("\n");
for (i = 0; i < 10; i++){
ret = [l2channel writeSync:buf length:length];
if (kIOReturnSuccess == ret)
break;
usleep(10000);
}
}
Cheers
-Josh
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med vänliga hälsningar / warmest regards,
/ ®
roman pixell
http://www.linkedin.com/in/pixell
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kåkbrinken 11a 3tr
111 27 stockholm
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