| 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 |
| |
| |