1 ============================= 2 USB 7-Segment Numeric Display 3 ============================= 4 5 Manufactured by Delcom Engineering 6 7 Device Information 8 ------------------ 9 USB VENDOR_ID 0x0fc5 10 USB PRODUCT_ID 0x1227 11 Both the 6 character and 8 character displays have PRODUCT_ID, 12 and according to Delcom Engineering no queryable information 13 can be obtained from the device to tell them apart. 14 15 Device Modes 16 ------------ 17 By default, the driver assumes the display is only 6 characters 18 The mode for 6 characters is: 19 20 MSB 0x06; LSB 0x3f 21 22 For the 8 character display: 23 24 MSB 0x08; LSB 0xff 25 26 The device can accept "text" either in raw, hex, or ascii textmode. 27 raw controls each segment manually, 28 hex expects a value between 0-15 per character, 29 ascii expects a value between '0'-'9' and 'A'-'F'. 30 The default is ascii. 31 32 Device Operation 33 ---------------- 34 1. Turn on the device: 35 echo 1 > /sys/bus/usb/.../powered 36 2. Set the device's mode: 37 echo $mode_msb > /sys/bus/usb/.../mode_msb 38 echo $mode_lsb > /sys/bus/usb/.../mode_lsb 39 3. Set the textmode: 40 echo $textmode > /sys/bus/usb/.../textmode 41 4. 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) 45 5. Set the decimal places. 46 The device has either 6 or 8 decimal points. 47 to set the nth decimal place calculate 10 ** n 48 and echo it in to /sys/bus/usb/.../decimals 49 To set multiple decimals points sum up each power. 50 For example, to set the 0th and 3rd decimal place 51 echo 1001 > /sys/bus/usb/.../decimals
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