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Subject: Help with FT2232H flow control

From: Dave McMahan <dmcmahan@xxxxxxxxxxxx>
To: "libftdi@xxxxxxxxxxxxxxxxxxxxxxx" <libftdi@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 18 Aug 2015 20:01:26 +0000

Hello,

 

I am using the FT2232H chip in an Android (linux) environment.  I am working with the latest libftdi (version 1.2), libusb (version 1.0).

 

I have built the code as a static library for Android and written an example program.  I am using port B on the chip for serial communications.  I can set the baud rate, parity, data bits, stop bits and this all works.  I can send and receive test patterns.  I am testing this on FT2232H Mini-Module purchased from FTDI.

 

My problem is in using hardware flow control with RTS and CTS.  The RTS output is always high, which prevents data from coming.  If I jumper RTS and CTS together, no data flows because of this.  If I simply ground CTS, I can send and receive data in loop back.  I have a USBee AX logic analyzer running on a separate laptop to see all the lines and their states.

 

I have changed the example program many times with several different combinations of API functions, changed order of API functions, etc.  Nothing seems to help.

 

I know my hardware works because I can use the same module on MacBook and Linux using the D2XX library from FTDI and hardware flow control works exactly like it should.    I tried to copy exactly the same API functions and order of calling from D2XX to libftdi but this also has the same problem.

 

I am using libftdi because it supports current Android software.   Current D2XX libraries are not available for Android, so I can’t use a 64-bit environment (a requirement for me).

 

Please let me know what I should be looking at or what other information you would like me to provide.  I don’t know which way to go to solve this.

 

 

  -dave

 



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