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| author | Harrison Metzger <harrisonmetz@gmail.com> | 2008-08-14 11:29:32 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-10-17 14:40:51 -0700 |
| commit | eb86be5424d4c08e686d5e578b72a26c516ae58a (patch) | |
| tree | 757c974b683640a6da10f0c8d21efac432a04243 /Documentation/usb | |
| parent | c3d36c453c84554eb12941b3f98abf4fefec000a (diff) | |
| download | lwn-eb86be5424d4c08e686d5e578b72a26c516ae58a.tar.gz lwn-eb86be5424d4c08e686d5e578b72a26c516ae58a.zip | |
USB: Added driver for a Delcom USB 7-segment LED Display
Added basic support for a Delcom USB 7-segment LED Display
Signed-off by: Harrison Metzger <harrisonmetz@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation/usb')
| -rw-r--r-- | Documentation/usb/misc_usbsevseg.txt | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/usb/misc_usbsevseg.txt b/Documentation/usb/misc_usbsevseg.txt new file mode 100644 index 000000000000..0f6be4f9930b --- /dev/null +++ b/Documentation/usb/misc_usbsevseg.txt @@ -0,0 +1,46 @@ +USB 7-Segment Numeric Display +Manufactured by Delcom Engineering + +Device Information +------------------ +USB VENDOR_ID 0x0fc5 +USB PRODUCT_ID 0x1227 +Both the 6 character and 8 character displays have PRODUCT_ID, +and according to Delcom Engineering no queryable information +can be obtained from the device to tell them apart. + +Device Modes +------------ +By default, the driver assumes the display is only 6 characters +The mode for 6 characters is: + MSB 0x06; LSB 0x3f +For the 8 character display: + MSB 0x08; LSB 0xff +The device can accept "text" either in raw, hex, or ascii textmode. +raw controls each segment manually, +hex expects a value between 0-15 per character, +ascii expects a value between '0'-'9' and 'A'-'F'. +The default is ascii. + +Device Operation +---------------- +1. Turn on the device: + echo 1 > /sys/bus/usb/.../powered +2. Set the device's mode: + echo $mode_msb > /sys/bus/usb/.../mode_msb + echo $mode_lsb > /sys/bus/usb/.../mode_lsb +3. Set the textmode: + echo $textmode > /sys/bus/usb/.../textmode +4. set the text (for example): + echo "123ABC" > /sys/bus/usb/.../text (ascii) + echo "A1B2" > /sys/bus/usb/.../text (ascii) + echo -ne "\x01\x02\x03" > /sys/bus/usb/.../text (hex) +5. Set the decimal places. + The device has either 6 or 8 decimal points. + to set the nth decimal place calculate 10 ** n + and echo it in to /sys/bus/usb/.../decimals + To set multiple decimals points sum up each power. + For example, to set the 0th and 3rd decimal place + echo 1001 > /sys/bus/usb/.../decimals + + |