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Messages - Rajesh@sys

Pages: [1] 2
Discussion - Hardware / Re: ft232h suspend mode
« on: August 08, 2019, 08:41:32 AM »
thank you so much for reply.

please explain the statement
<Although the hardware does not have RTS/CTS pins the driver does not know this, but it is now forced to monitor certain status bits, which allows the TXE# pin to be kept at logic 1 until space is made available>

how to Implement status bit logic ??

Rajeshkumar Athram

Discussion - Hardware / Re: ft232h suspend mode
« on: August 07, 2019, 06:21:50 AM »
is USB going to suspend mode ?

Discussion - Hardware / ft232h suspend mode
« on: August 06, 2019, 02:39:37 PM »

i am using ft232h in 245 FIFO synchronous mode.  i am using Hercules to Read data from USB.

after writing few frames of data (1frame= 512bytes) roughly 20 frames.

TXE is going to high state. and when it comes to low state my hardware not writing data.

please let me know how to make ft232h to write continuous data.?


waiting for your suggestion


i am using FT232H in my project.

as i am transferring continuous data from FPGA to PC using FT232H.

in oscilloscope i am observing TXE is HIgh for long time. of 1millisecond. i am loosing transfer speed here.

please see the attached snapshot of TXE.

 is there any way to make TXE  to LOW condition in micro-secs ..?  can we control TXE ?

Rajeshkumar Athram

Discussion - Hardware / Re: FT232H handle in visual studio
« on: June 27, 2019, 08:15:34 AM »
   I have a doubt that the procedure which you mentioned in previous reply is similar for visual studio 2017 as I am using this IDE.
waiting for someone to help.


Discussion - Hardware / FT232H handle in visual studio
« on: June 25, 2019, 11:16:53 AM »

 i am using visual studio 2017 to configure FT232H to synchronous mode.
i am able to detect ft232h as comport.(using vcp drivers)

as given pdf (building application  in visual studio) i have included .dll files from and header file  "d2xx driver".

i have used code from "TN_167 FIFO Basics (USB2.0)" fifo synchronous read code.

with these i am able  confirm FTDI IC is connected. as it showing(command prompt) code is excited with 0.

if i disconnect usb i am able to see "device status not ok".

my query is :

1) why i am not able to access ft_handle function.

2) code is everytime entering into null.

please suggest me., how access ft_handle


Discussion - Hardware / Re: txe and rxe signals in FT232H
« on: April 27, 2019, 06:09:28 AM »
Thank you  :)

Discussion - Hardware / Re: 232h in synchronous mode
« on: April 27, 2019, 06:05:49 AM »
thank you for reply .

the VI's which available in link are NOT updated.


kindly share updated VI's files if available.

as many of us NOT known LabVIEW programming.

please consider my request and update LabVIEW VI's  using which we can use FTDI's products easily.

Discussion - Hardware / 232h in synchronous mode
« on: April 26, 2019, 12:48:53 PM »

we are using UM232H in one of our projects.
we are using in synch FIFO mode.

After power ON
1) to set synchronous FIFO mode. we are sending 0x40 using FT_HANDLE/ from Visual Studio/COM port - after every power ON off board..

2) we are using Labview to read data. using NI-VISA as USB port.

here we are facing problem.   switching between labview and visual studio.


3) how to set  UM232H in synchronous FIFO mode permanently.

please suggest/share if any document is available for setting synch mode permanently.

Discussion - Hardware / Re: txe and rxe signals in FT232H
« on: March 19, 2019, 10:33:14 AM »
thank you very much for your reply.

When high, do not read data from the FIFO. When low, there is data available in the FIFO which can be read by driving RD# low. When in synchronous mode, data is transferred on every clock that RXF# and RD# are both low. Note that the OE# pin must be driven low at least 1 clock period before asserting RD# low.

When high, do not write data into the FIFO. When low, data can be written into the FIFO by driving WR# low. When in synchronous mode, data is transferred on every clock that TXE# and WR# are both low.

A write operation can be started when TXE# is low.

A read operation is started when the chip drives RXF# low. >

i know this one.

are they independent ??

can we perform READ and WRITE at same time ?

Discussion - Hardware / txe and rxe signals in FT232H
« on: March 15, 2019, 01:27:33 PM »

RXE and TXE signals are dependent or independent ?

                can TXE and RXE go LOW at same time.

Discussion - Software / labview programs for ft232h device.
« on: January 07, 2019, 09:20:01 AM »
i am using FT232H in my project.(FPGA-FT232H) other end i am using LABVIEW2018.  to verify/check  the data.

the programs available at "https://www.ftdichip.com/Support/SoftwareExamples/CodeExamples/LabVIEW.htm"
are not supporting with new version of labview.

please share the updated labview programs which ssupports LABVIEW2018.

Discussion - Software / data rate calculation ft232h asynchronous fifo mode
« on: November 28, 2018, 01:06:21 PM »

we are using FT232H in my project,

and sending continuous data with respect to TXE# is low.

we want to know the data rate of transmission to pc. how to calculate data rate of transmission for asynchronous FIFO mode??

Discussion - Drivers / Re: issue related to UM232H eval. board
« on: September 28, 2018, 07:58:23 AM »
thanks for the previous suggestions

As i indicated earlier,

we are using  FPGA based hardware to write the data in UM232H(tool ISE). After some no of writes TXE is gone low to high, Hence, we are NOT able write further.
our understanding is that , Sense the visual studio/laptop  does NOT do fifo read operation. The TXE remains high,
our current issue is
 we are not able to read back the data from UM232h/FIFO via COM PORT. because we are using synchronous fifo mode(using ONLY D2XX).

so for configuring UM232H in synch. fifo mode and reading we are using VISUAL STUDIO 2017.>

i want to know

1)how does visual studio knows when to read the data from fifo.
                is it based on any bit of the software register (or) any hardware signal from board. (such as fifo full)—it is not accessible by the software

3)how to access read operation from visual studio.

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