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polu
n00b
Joined: 02 Mar 2007
Posts: 16
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 Posted: Thu Jan 31, 2008 4:13 pm Post subject: HTvision USB2LCD |
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I have an HTvision USB LCD device. It's an HD44780 compatible character LCD.
When I hook the LCD up to a Windows computer, a new serial port is created (COM3), and I can use the LCD using the Crystalfontz driver. (16x2, 9600)
But when I connect it to my Gentoo machine, it's not recognized at all. Not even as Serial device:
| Code: | usb 2-1: new full speed USB device using ohci_hcd and address 4
usb 2-1: configuration #1 chosen from 1 choice
usb 2-1: USB disconnect, address 4
usb 2-1: new full speed USB device using ohci_hcd and address 5
usb 2-1: configuration #1 chosen from 1 choice |
I have USBSerial enabled in my kernel:
| Code: | | CONFIG_USB_SERIAL=y |
Well, maybe it does work, but how do I know which device in "/dev/" is my USB LCD? |
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polu
n00b
Joined: 02 Mar 2007
Posts: 16
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| Posted: Thu Jan 31, 2008 6:42 pm Post subject: |
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Never mind. I've got it working. 
Make sure usbserial is a module. (NOT included in the kernel)
Run "lsusb -v" to grep the vendor and product id:
| Code: |
Bus 002 Device 002: ID 04d8:000a Microchip Technology, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 2 Communications
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x04d8 Microchip Technology, Inc.
idProduct 0x000a
bcdDevice 0.00
iManufacturer 1 HTvision
iProduct 2 USB-LCD
iSerial 3 V08.0b
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Modprobe usbserial with these parameters:
| Code: | | modprobe usbserial vendor=0x04d8 product-0x000a |
Create an usbserial device:
| Code: | | mknod /dev/ttyUSB0 c 188 0 |
I can now send data to the LCD using LCD4Linux. The text doesn't show up 100% correctly but it's a start! |
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