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- =============================
- 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
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