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Forum: ARM programming with GCC/GNU tools Help needed to make DLP2232M work!


Author: kansusid (Guest)
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Hi all,

 I am trying to implement USB to RS232 converter using DLP2232M module
which uses FT2232C(FTDI chip). This I am using with PIC16F877A.

My connections are for USB self-powered configuration ( pins 17,18,19
connected to external +5V, while pins 22,23,24,25 are grounded).

I have downloaded Combined Driver Model CDM 2.00 from FTDI website,
unzipped and installed.

On hooking the circuit to the PC, the PC detects it and after
installation, it recognises the module as USB serial converter A and USB
serial converter B.

But the device is not listed as virtual com port like com2,com3 or com4
so that it can be used as RS232 port.  What could be the problem? Any
suggestions to make the DLP2232M to work?

Thanks in advance

Author: Stefan (Guest)
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I have such a device too because i'll try to build a USB JTAG device for
a ARM7 (AT91R40008) according to
http://www.fh-augsburg.de/~hhoegl/proj/usbjtag/usbjtag.html

But i havn't yet started the project. Maybe your question is a good
starting point ;-)

"Combined driver model (D2XX and VCP). Devices programmed as VCP will
expose a COM port, as will AM and BM devices."
http://www.ftdichip.com/Drivers/D2XX.htm

But as far as i understand:
You have to program/configure the device first as VCP and then it will
expose a virtual COM on PC. OR you can overwrite the device setting with
a property page of the combined device drivers.

Configuration of the device via EEPROM:
=======================================

WARNING - WARNING - WARNING - WARNING - WARNING - WARNING - WARNING -
WARNING
"If you are unsure about any of the features described in this document,
please do not change any of your driver files or registry settings and
seek assistance from FTDI Support."
http://www.ftdichip.com/Documents/AppNotes/AN232B-...
WARNING - WARNING - WARNING - WARNING - WARNING - WARNING - WARNING -
WARNING

"The EEPROM is programmable in-circuit via USB using a utility program
available from both FTDI

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