Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 USB 7-Segment Numeric Display 2 Manufactured by Delcom Engineering 3 4 Device Information 5 ------------------ 6 USB VENDOR_ID 0x0fc5 7 USB PRODUCT_ID 0x1227 8 Both the 6 character and 8 character displays have PRODUCT_ID, 9 and according to Delcom Engineering no queryable information 10 can be obtained from the device to tell them apart. 11 12 Device Modes 13 ------------ 14 By default, the driver assumes the display is only 6 characters 15 The mode for 6 characters is: 16 MSB 0x06; LSB 0x3f 17 For the 8 character display: 18 MSB 0x08; LSB 0xff 19 The device can accept "text" either in raw, hex, or ascii textmode. 20 raw controls each segment manually, 21 hex expects a value between 0-15 per character, 22 ascii expects a value between '0'-'9' and 'A'-'F'. 23 The default is ascii. 24 25 Device Operation 26 ---------------- 27 1. Turn on the device: 28 echo 1 > /sys/bus/usb/.../powered 29 2. Set the device's mode: 30 echo $mode_msb > /sys/bus/usb/.../mode_msb 31 echo $mode_lsb > /sys/bus/usb/.../mode_lsb 32 3. Set the textmode: 33 echo $textmode > /sys/bus/usb/.../textmode 34 4. 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) 38 5. 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