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-   -   glcd + ftdi + usb (

tooly 09-19-2005 10:19 AM

glcd + ftdi + usb

i has the LCD from

The Display has an ftdi232bm chip to communicate with USB and an S1D13305F for Display.

USB VendorID=0x403 and ProductID=0xe588

I added to ftdio_sio.h and ftdi_sio.c the product ID and recompile the ftdi_sio kernel modul.
Then i add :
BUS="usb", SYSFS{idProduct}="e588", NAME="lcd", SYMLINK="usb/lcd", MODE="0666"
to my udev rules.

Now when i connect the Display dmesg say:

drivers/usb/serial/usb-serial.c: USB Serial support registered for FTDI USB Serial Device
ftdi_sio 2-2:1.0: FTDI USB Serial Device converter detected
drivers/usb/serial/ftdi_sio.c: Detected FT232BM
usb 2-2: FTDI USB Serial Device converter now attached to ttyUSB0
usbcore: registered new driver ftdi_sio
drivers/usb/serial/ftdi_sio.c: v1.4.3:USB FTDI Serial Converters Driver

and i has an dev in /dev/usb/lcd

But how can i send some informations to Display?

First i thought that serdisplib can help, but at this time there is no rs232 support.
Then i asked the manufactur if there is any linux library for this display, but the answer was "Not now, maybe later".

Has anyone expirience with this Display in Linux?

My System:
AMD64 3200+, Kernel, LFS pure64.

Hope you can read my english ;)


tooly 09-25-2005 11:47 AM

Hi again,

i never unterstand how i can send data to the LCD via kernel.

So i conntect the LCD to an windows computer and record the data with usbsnoop (

lsusb -v :

Bus 002 Device 002: ID 0403:e588 Future Technology Devices International, Ltd
Device Descriptor:
  bLength                18
  bDescriptorType        1
  bcdUSB              2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass        0
  bDeviceProtocol        0
  bMaxPacketSize0        8
  idVendor          0x0403 Future Technology Devices International, Ltd
  idProduct          0xe588
  bcdDevice            4.00
  iManufacturer          1 Wallbraun-Elect.
  iProduct                2 LCD-USB-Interface V1
  iSerial                3 WE3EFDQG
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                9
    bDescriptorType        2
    wTotalLength          32
    bNumInterfaces          1
    bConfigurationValue    1
    iConfiguration          0
    bmAttributes        0xc0
      Self Powered
    MaxPower                0mA
    Interface Descriptor:
      bLength                9
      bDescriptorType        4
      bInterfaceNumber        0
      bAlternateSetting      0
      bNumEndpoints          2
      bInterfaceClass      255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              2 LCD-USB-Interface V1
      Endpoint Descriptor:
        bLength                7
        bDescriptorType        5
        bEndpointAddress    0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type              None
          Usage Type              Data
        wMaxPacketSize    0x0040  1x 64 bytes
        bInterval              0
      Endpoint Descriptor:
        bLength                7
        bDescriptorType        5
        bEndpointAddress    0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type              None
          Usage Type              Data
        wMaxPacketSize    0x0040  1x 64 bytes
        bInterval              0

Next i write this small c program:

#include <config.h>

#include <stdio.h>
#include <stdlib.h>

#include <usb.h>

#define USBLCD_VENDOR_ID  0x0403
#define USBLCD_PRODUCT_ID 0xe588

extern int usb_debug;

static usb_dev_handle *lcd;
static int interface;
static char *Buffer;
static char *BufPtr;

int drv_UL_open(void) {

  struct usb_bus *busses, *bus;
  struct usb_device *dev;

  lcd = NULL;

  usb_debug = 0;

  busses = usb_get_busses();

  for (bus = busses; bus; bus = bus->next) {
    for (dev = bus->devices; dev; dev = dev->next) {
      if ((dev->descriptor.idVendor == USBLCD_VENDOR_ID) &&
          (dev->descriptor.idProduct == USBLCD_PRODUCT_ID)) {
        printf ("USB LCD gefunden\n");
        lcd = usb_open(dev);
        if (usb_claim_interface(lcd, interface) < 0) {
          printf ("FEHLER : usb_claim_interface\n");
          return -1;
        else {
          printf ("usb_claim_interface erfolgreich\n");
  return -1;

int drv_UL_close(void) {
  usb_release_interface (lcd, interface);
  printf (" LCD wieder freigegeben\n");

int drv_CMD(void) {
  char *cmdBuf, *cmdPtr, *inBuf, *inPtr;
  int rv, i, inrv;

  inBuf = (char *) malloc(1024);
  if (inBuf == NULL) {
    printf ("kann speicher nicht reservieren!\n");
    return -1;
  inrv = usb_bulk_read(lcd, 0x81, inBuf, 1000, 1000);
  printf ("Ergebnis von usb_bulk_read: %d\n", inrv);

  cmdBuf = (char *) malloc(1024);
  if (cmdBuf == NULL) {
    printf ("Kann Speicher für cmd nicht reservieren!\n");
    return -1;

  rv=usb_bulk_write (lcd, 0x02, cmdBuf, 6, 1000);
  printf ("ergebnis von usb_bulk_write2 %d\n", rv);

  for (i=1; i <=1007; ++i) {
  rv=usb_bulk_write (lcd, 0x02, cmdBuf, 1024, 1000);
  printf ("ergebnis von usb_bulk_write3 %d\n", rv);

  for (i=1; i <= inrv; ++i) {
  printf ("Inhalt inBuf %x\n", *inPtr++);

  free (inBuf);
  free (cmdBuf);

int main(int argc, char *argv[])

  return EXIT_SUCCESS;

All the program to is, write my name to the LCD.

Take a look at // First DATA to LCD, the second and third byte are the lengt of data that follow, but dont know for what is 0x04 and 0x4f?

// Second DATA to LCD
First byte 0x08 ?
Second and third byte = 0x03FD = lengt of the follow data
rest is easy, my Name and some spaces.

Anyone know for what is 0x04, 0x4f and 0x08?

Hope you can read my english.


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