Forums

FTDI FT232BM

Started by Zerocool March 18, 2005
Hi, i'm new in using FTDI FT232BM. Currently, i'm want to send bulk o
information from micro-controller to PC using USB. I've built a boar
and the device is connected to my pc usb port
My PC is able to detect the chip but i couldn't install the drive
which i downloaded from FTDI website
My PC detects it as Unknown Device
Is it necessary to program the eeprom first
Anyone could help me

Thanks.

"Zerocool" <mychua1221@yahoo-dot-com.no-spam.invalid> wrote in message
news:msGdncfI5qhoFKffRVn_vQ@giganews.com...
> Hi, i'm new in using FTDI FT232BM. Currently, i'm want to send bulk of > information from micro-controller to PC using USB. I've built a board > and the device is connected to my pc usb port. > My PC is able to detect the chip but i couldn't install the driver > which i downloaded from FTDI website. > My PC detects it as Unknown Devices > Is it necessary to program the eeprom first?
No. if the eeprom is not programmed, the device has a PID of 6001 and will work with the provided drivers from the FTDI website. I have seen with our products that if the PC sees an unknown device, there was always a problem with the connection to the (even empty) eeprom. Meindert
"Zerocool" <mychua1221@yahoo-dot-com.no-spam.invalid> schreef in bericht
news:msGdncfI5qhoFKffRVn_vQ@giganews.com...
> Hi, i'm new in using FTDI FT232BM. Currently, i'm want to send bulk of > information from micro-controller to PC using USB. I've built a board > and the device is connected to my pc usb port. > My PC is able to detect the chip but i couldn't install the driver > which i downloaded from FTDI website. > My PC detects it as Unknown Devices > Is it necessary to program the eeprom first? > Anyone could help me? > > Thanks.. >
To be able to program the EEPROM, the device has be installed properly before MPROG recognizes it. Have you followed the datasheet? You did not forget the 1K5 resistor from the D+ line to /RSTOUT? Also the two resistors on the EEPROM? Does it oscillate at 6MHz? Jeroen
Am Fri, 18 Mar 2005 01:57:41 -0600 schrieb Zerocool:

> Hi, i'm new in using FTDI FT232BM. Currently, i'm want to send bulk of > information from micro-controller to PC using USB. I've built a board > and the device is connected to my pc usb port. > My PC is able to detect the chip but i couldn't install the driver > which i downloaded from FTDI website. > My PC detects it as Unknown Devices > Is it necessary to program the eeprom first? > Anyone could help me? > > Thanks..
Try to install the driver with disconnected EEPROM...
On Fri, 18 Mar 2005 01:57:41 -0600, mychua1221@yahoo-dot-com.no-spam.invalid (Zerocool) wrote:

>Hi, i'm new in using FTDI FT232BM. Currently, i'm want to send bulk of >information from micro-controller to PC using USB. I've built a board >and the device is connected to my pc usb port. >My PC is able to detect the chip but i couldn't install the driver >which i downloaded from FTDI website. >My PC detects it as Unknown Devices >Is it necessary to program the eeprom first? >Anyone could help me? > >Thanks..
If the eeprom already has something in it this may be confusing things. If the eeprom is blank, it could be that you already have a part-installation from another FTDI device. Shorts on the EEPROM lines can make it do VERY strange things. The setup should be one of the following : a) blank or no eeprom, using drivers as-is b) eeprom programmed with a VID/PID using MPROG, and the driver .inf files modified as described in the Mprog online help to reflect the changed VID/PID. (you can make up a PID for experimentation, FTDI will allocate you one for production if you ask them).
Hi Zerocool,

I don't know enough about the chip, but AFAIK there are many usb 
devices, that should not connected to the pc, bevore installing the 
driver for it. Take a look in the readme.

HTH
Michael
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"Michael Lange" <leckmich@despammed.com> wrote in message
news:d1f21p$9uo$1@online.de...
> Hi Zerocool, > > I don't know enough about the chip, but AFAIK there are many usb > devices, that should not connected to the pc, bevore installing the > driver for it. Take a look in the readme.
AFAIK any device may be connected to a PC running windows. Windows will then *always* ask for drivers. Anyway, the FTDI chips work that way. There is no installation program that allows you to pre-install. just plug in the device and windows does the rest (ask you for a disk or location). Meindert
On Fri, 18 Mar 2005 18:11:12 +0100, Michael Lange <leckmich@despammed.com> wrote:

>Hi Zerocool, > >I don't know enough about the chip, but AFAIK there are many usb >devices, that should not connected to the pc, bevore installing the >driver for it. Take a look in the readme.
This is just a recommendation that comes with some products to simplify installation. If the application software is installed first, it can install drivers so Windoze finds and installs them automagically when the device is plugged in instead of asking the user where to find them (and they may be buried in a compressed install file).
On Fri, 18 Mar 2005 19:04:32 +0100, "Meindert Sprang" <mhsprang@NOcustomSPAMware.nl> wrote:

>"Michael Lange" <leckmich@despammed.com> wrote in message >news:d1f21p$9uo$1@online.de... >> Hi Zerocool, >> >> I don't know enough about the chip, but AFAIK there are many usb >> devices, that should not connected to the pc, bevore installing the >> driver for it. Take a look in the readme. > >AFAIK any device may be connected to a PC running windows. Windows will then >*always* ask for drivers. > >Anyway, the FTDI chips work that way. There is no installation program that >allows you to pre-install. just plug in the device and windows does the rest >(ask you for a disk or location).
You could make an install package for your application that included the FTDI drivers, using a custom PID, so they were installed ready for when the user plugs the device in,
"Mike Harrison" <mike@whitewing.co.uk> wrote in message
news:cg8m31t7h1em9m8us1kkblc87p00jhgtq4@4ax.com...
> On Fri, 18 Mar 2005 19:04:32 +0100, "Meindert Sprang"
<mhsprang@NOcustomSPAMware.nl> wrote:
> >AFAIK any device may be connected to a PC running windows. Windows will
then
> >*always* ask for drivers. > > > >Anyway, the FTDI chips work that way. There is no installation program
that
> >allows you to pre-install. just plug in the device and windows does the
rest
> >(ask you for a disk or location). > > You could make an install package for your application that included the
FTDI drivers, using a
> custom PID, so they were installed ready for when the user plugs the
device in, That is correct. Meindert