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1=============================2USB 7-Segment Numeric Display3=============================4 5Manufactured by Delcom Engineering6 7Device Information8------------------9USB VENDOR_ID 0x0fc510USB PRODUCT_ID 0x122711Both the 6 character and 8 character displays have PRODUCT_ID,12and according to Delcom Engineering no queryable information13can be obtained from the device to tell them apart.14 15Device Modes16------------17By default, the driver assumes the display is only 6 characters18The mode for 6 characters is:19 20 MSB 0x06; LSB 0x3f21 22For the 8 character display:23 24 MSB 0x08; LSB 0xff25 26The device can accept "text" either in raw, hex, or ascii textmode.27raw controls each segment manually,28hex expects a value between 0-15 per character,29ascii expects a value between '0'-'9' and 'A'-'F'.30The default is ascii.31 32Device Operation33----------------341. Turn on the device:35 echo 1 > /sys/bus/usb/.../powered362. Set the device's mode:37 echo $mode_msb > /sys/bus/usb/.../mode_msb38 echo $mode_lsb > /sys/bus/usb/.../mode_lsb393. Set the textmode:40 echo $textmode > /sys/bus/usb/.../textmode414. set the text (for example):42 echo "123ABC" > /sys/bus/usb/.../text (ascii)43 echo "A1B2" > /sys/bus/usb/.../text (ascii)44 echo -ne "\x01\x02\x03" > /sys/bus/usb/.../text (hex)455. Set the decimal places.46 The device has either 6 or 8 decimal points.47 to set the nth decimal place calculate 10 ** n48 and echo it in to /sys/bus/usb/.../decimals49 To set multiple decimals points sum up each power.50 For example, to set the 0th and 3rd decimal place51 echo 1001 > /sys/bus/usb/.../decimals52