Re: [linux-usb-devel] USB bulk read very slow !

[Josep Comas]

Hello,

You send more data in same bulk transfer packet (until endpoint max data 
transfer). This works great sending firmware.

Regards,
  Josep
En/na Ga�tan Marti ha escrit:

I implement a new version of my library using FTDI_SIO and USBSERIAL
modules. I've used the open,close,read and write commands to access the
port. Unfortunately, the new update rate is 25 Hz (compared to 900 Hz
under Windows). As my device use bulk read/write to transfer data I
really do not know how to configure the serial port to work at full
speed.
Does anybody has some source C code or some tips.

Thanks

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Paulo
Marques
Sent: jeudi 30 octobre 2003 06:08
To: Ga�tan Marti
Cc: [EMAIL PROTECTED]
Subject: Re: [linux-usb-devel] USB bulk read very slow !


Ga�tan Marti wrote:

 

The current ftdi_sio module is for the FT8U100AX, 8U232AM, as well as
for the USB to parallel converter (245).
Our application is using the FT232BM and I'm not sure the FTDI_SIO
module is designed for it!
   



The module works fine with the FT232BM chip and I talk from personal
experience 
here :)

The only thing the driver doesn't support AFAIK is the bit-bang mode of
this 
chip, because this mode doesn't fit in a serial driver architecture.

If you have a custom device with your own VID/PID, just edit the source
at:
/drivers/usb/serial/ftdi_sio.c

and add an entry with your data to the array "id_table_FT232BM".

You probably can get more speed by using this driver than you would ever
using 
libusb.

 

Ga�tan Marti wrote:

   

I'm currently porting an application from windows to linux. The

     

software

   

read a stream of data coming from a custom device. The USB chip used

     

is

   

a FTDI USB-Serial.

     

This may seem like a silly question, but why don't you use the FTDI
serial 
driver that is already in the kernel?
   

Best regards,

 





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