This section talks about using LCDproc with the Futaba / Targa USB Graphic Vacuum Fluorescent Display (MDM166A; USB VID=0x19c2, PID=0x6a11).
The MDM166A is a graphical VFD with a 96x16 pixel dot matrix area which
is used for 16x2 characters with a 6x8 pixel font. It features several icons,
volume level and WLAN strength indicator which are all software controllable
using the output
function.
The mdm166a driver builds on top of libhid
which in
turn uses libusb
.
The driver was developed by Christoph Rasim (http://www.rasim.net/) without any available documentation from the vendor, but with a good protocol description from Thomas Koos (http://www.muetze1.de) created by reverse engineering the protocol.
The icons, the volume bar and the WLAN indicator supported by the VFD
can be controlled by use of the output
function.
The on
parameter is used as a
bitmask to control which elements to display. Setting an icon bit to
1
enables the icon, setting the bit to 0
disables an icon. Volume and WLAN strength indicator accept an numeric value
in the given bit mask.
Table 5.19. mdm166a_output bitmask
bit(s) | Icon |
---|---|
0 | Play |
1 | Pause |
2 | Record |
3 | Message |
4 | Mail (at-symbol) |
5 | Mute |
6 | WLAN tower |
7 | Volume (the word) |
8…12 | Volume (decimal 0…28) |
13…14 | WLAN strength (0…3) |
This display may appear as a HID device in your
system which may prevent libhid
from being able to open
the USB device. In this case you have to create some OS-specific
configuration to prevent the HID driver to take control
of this display.
To make the uhid driver ignore this device you have to apply the following patch to your kernel source and recompile and install your kernel:
--- sys/dev/usb/usbdevs.orig 2010-11-24 02:06:30.000000000 +0100 +++ sys/dev/usb/usbdevs 2010-11-24 07:36:38.000000000 +0100 @@ -623,6 +623,7 @@ vendor AMIT 0x18c5 AMIT vendor QCOM 0x18e8 Qcom vendor LINKSYS3 0x1915 Linksys +vendor TARGA 0x19c2 Targa Corporation vendor QUALCOMMINC 0x19d2 Qualcomm, Incorporated vendor STELERA 0x1a8d Stelera Wireless vendor DRESDENELEKTRONIK 0x1cf1 dresden elektronik @@ -2343,6 +2344,9 @@ /* System TALKS, Inc. */ product SYSTEMTALKS SGCX2UL 0x1920 SGC-X2UL +/* Targa Corporation */ +product TARGA VFD 0x6a11 Targa USB Graphic VFD + /* Tapwave products */ product TAPWAVE ZODIAC 0x0100 Zodiac --- sys/dev/usb/usb_quirks.c.orig 2010-11-24 02:07:03.000000000 +0100 +++ sys/dev/usb/usb_quirks.c 2010-11-24 02:16:30.000000000 +0100 @@ -112,6 +112,8 @@ ANY, { UQ_HID_IGNORE }}, { USB_VENDOR_APPLE, USB_PRODUCT_APPLE_IPHONE_3G, ANY, { UQ_HID_IGNORE }}, + { USB_VENDOR_TARGA, USB_PRODUCT_TARGA_VFD, + ANY, { UQ_HID_IGNORE }}, /* Devices which should be ignored by both ukbd and uhid */ { USB_VENDOR_CYPRESS, USB_PRODUCT_CYPRESS_WISPY1A,