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1 | |||
2 | Parallel link cable for Texas Instruments handhelds | ||
3 | =================================================== | ||
4 | |||
5 | |||
6 | Author: Romain Lievin | ||
7 | Homepage: http://lpg.ticalc.org/prj_tidev/index.html | ||
8 | |||
9 | |||
10 | INTRODUCTION: | ||
11 | |||
12 | This is a driver for the very common home-made parallel link cable, a cable | ||
13 | designed for connecting TI8x/9x graphing calculators (handhelds) to a computer | ||
14 | or workstation (Alpha, Sparc). Given that driver is built on parport, the | ||
15 | parallel port abstraction layer, this driver is architecture-independent. | ||
16 | |||
17 | It can also be used with another device plugged on the same port (such as a | ||
18 | ZIP drive). I have a 100MB ZIP and both of them work fine! | ||
19 | |||
20 | If you need more information, please visit the 'TI drivers' homepage at the URL | ||
21 | above. | ||
22 | |||
23 | WHAT YOU NEED: | ||
24 | |||
25 | A TI calculator and a program capable of communicating with your calculator. | ||
26 | |||
27 | TiLP will work for sure (since I am its developer!). yal92 may be able to use | ||
28 | it by changing tidev for tipar (may require some hacking...). | ||
29 | |||
30 | HOW TO USE IT: | ||
31 | |||
32 | You must have first compiled parport support (CONFIG_PARPORT_DEV): either | ||
33 | compiled in your kernel, either as a module. | ||
34 | |||
35 | Next, (as root): | ||
36 | |||
37 | modprobe parport | ||
38 | modprobe tipar | ||
39 | |||
40 | If it is not already there (it usually is), create the device: | ||
41 | |||
42 | mknod /dev/tipar0 c 115 0 | ||
43 | mknod /dev/tipar1 c 115 1 | ||
44 | mknod /dev/tipar2 c 115 2 | ||
45 | |||
46 | You will have to set permissions on this device to allow you to read/write | ||
47 | from it: | ||
48 | |||
49 | chmod 666 /dev/tipar[0..2] | ||
50 | |||
51 | Now you are ready to run a linking program such as TiLP. Be sure to configure | ||
52 | it properly (RTFM). | ||
53 | |||
54 | MODULE PARAMETERS: | ||
55 | |||
56 | You can set these with: modprobe tipar NAME=VALUE | ||
57 | There is currently no way to set these on a per-cable basis. | ||
58 | |||
59 | NAME: timeout | ||
60 | TYPE: integer | ||
61 | DEFAULT: 15 | ||
62 | DESC: Timeout value in tenth of seconds. If no data is available once this | ||
63 | time has expired then the driver will return with a timeout error. | ||
64 | |||
65 | NAME: delay | ||
66 | TYPE: integer | ||
67 | DEFAULT: 10 | ||
68 | DESC: Inter-bit delay in micro-seconds. A lower value gives an higher data | ||
69 | rate but makes transmission less reliable. | ||
70 | |||
71 | These parameters can be changed at run time by any program via ioctl(2) calls | ||
72 | as listed in ./include/linux/ticable.h. | ||
73 | |||
74 | Rather than write 50 pages describing the ioctl() and so on, it is | ||
75 | perhaps more useful you look at ticables library (dev_link.c) that demonstrates | ||
76 | how to use them, and demonstrates the features of the driver. This is | ||
77 | probably a lot more useful to people interested in writing applications | ||
78 | that will be using this driver. | ||
79 | |||
80 | QUIRKS/BUGS: | ||
81 | |||
82 | None. | ||
83 | |||
84 | HOW TO CONTACT US: | ||
85 | |||
86 | You can email me at roms@lpg.ticalc.org. Please prefix the subject line | ||
87 | with "TIPAR: " so that I am certain to notice your message. | ||
88 | You can also mail JB at jb@jblache.org. He packaged these drivers for Debian. | ||
89 | |||
90 | CREDITS: | ||
91 | |||
92 | The code is based on tidev.c & parport.c. | ||
93 | The driver has been developed independently of Texas Instruments. | ||