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Harrison Metzgereb86be52008-08-14 11:29:32 -05001USB 7-Segment Numeric Display
2Manufactured by Delcom Engineering
3
4Device Information
5------------------
6USB VENDOR_ID 0x0fc5
7USB PRODUCT_ID 0x1227
8Both the 6 character and 8 character displays have PRODUCT_ID,
9and according to Delcom Engineering no queryable information
10can be obtained from the device to tell them apart.
11
12Device Modes
13------------
14By default, the driver assumes the display is only 6 characters
15The mode for 6 characters is:
16 MSB 0x06; LSB 0x3f
17For the 8 character display:
18 MSB 0x08; LSB 0xff
19The device can accept "text" either in raw, hex, or ascii textmode.
20raw controls each segment manually,
21hex expects a value between 0-15 per character,
22ascii expects a value between '0'-'9' and 'A'-'F'.
23The default is ascii.
24
25Device Operation
26----------------
271. Turn on the device:
28 echo 1 > /sys/bus/usb/.../powered
292. Set the device's mode:
30 echo $mode_msb > /sys/bus/usb/.../mode_msb
31 echo $mode_lsb > /sys/bus/usb/.../mode_lsb
323. Set the textmode:
33 echo $textmode > /sys/bus/usb/.../textmode
344. set the text (for example):
35 echo "123ABC" > /sys/bus/usb/.../text (ascii)
36 echo "A1B2" > /sys/bus/usb/.../text (ascii)
37 echo -ne "\x01\x02\x03" > /sys/bus/usb/.../text (hex)
385. Set the decimal places.
39 The device has either 6 or 8 decimal points.
40 to set the nth decimal place calculate 10 ** n
41 and echo it in to /sys/bus/usb/.../decimals
42 To set multiple decimals points sum up each power.
43 For example, to set the 0th and 3rd decimal place
44 echo 1001 > /sys/bus/usb/.../decimals
45
46