iPod connector and protocol

前天有人問說想要用ipod來連接控制我們的系統，這真是個好問題ㄚ，要能通訊的話要先了解pin的定義，於是就上網找了一下iPod的腳位及protocol，把相關資料整理一下。



iPod總共有30pin
communication: serial port ,8N1, 19200 baud rate

針腳定義:

The male dock connector's internal pin numbering: 

1 3 5 7 9  11 13 15 17 19 21 23 25 27 29
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
Pin#/Functions: 

1  Ground (-) 1
2  Line Out - Common Ground (-) 1
3  Line Out - R (+)
4  Line Out - L (+)
5  Line In - R (+)
6  Line In - L (+)
7
8  Video Out - Composite Video (for ipod colour when slideshow activated) 6
9  S-Video Chrominance 7
10 S-Video Luminance 7
11 Serial GND
12 Serial TxD
13 Serial RxD
14
15 Ground (-) 2
16 USB GND (-) 2
17
18 3.3V Power (+) 8
19 Firewire Power 12 VDC (+) 3
20 Firewire Power 12 VDC (+) 3
21 Accessory Indicator 4
22 FireWire Data TPA (-)
23 USB Power 5 VDC (+) 9
24 FireWire Data TPA (+)
25 USB Data (-) 9
26 FireWire Data TPB (-)
27 USB Data (+) 9
28 FireWire Data TPB (+)
29 FireWire Ground (-) 5
30 FireWire Ground (-) 5

資料格式:

















Field
Size
Value
  
Header
2
0xff 0x55
Length     
1     
Size of Mode + Command + Parameter
 
Mode       
1     
The mode the command is referring to.
 
Command    
2     
The two bite command.
 
Parameter  
0..n  
Optional parameter, depending on the command.
 
Checksum   
1     
0x100 - ( (sum of all length/mode/command/parameter bytes) & 0xFF)
 

例如: FF 55 03 00 01 04 F8

看起來應該可以很容易連線....

參考資料:
http://nuxx.net/wiki/iPod_Dock_Connector
http://nuxx.net/wiki/Apple_Accessory_Protocol
http://stud3.tuwien.ac.at/~e0026607/ipod_remote/ipod_ap.html