Hello,
thank you for pointing me to the example in libftdi. I tried stream_test.c and
got close to 40 MB/s, so I think the problem is in my code, not libftdi or the
USB stack. I will try to rewrite my program to use ftdi_readstream().
Best regards and greetings from Darmstadt,
Laurenz
------ Original Message ------
Date: Sat, 30 Mar 2019 00:47:21 +0100
Subject: Re: Maximize transfer speeds on Linux with FT232H in sync FIFO mode
From: bon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
To: libftdi@xxxxxxxxxxxxxxxxxxxxxxx
> Laurenz Kamp writes:
>> Hello,
>>
>> I am currently working with an FT232H that is connected to an FPGA that
>> generates the data that is sent to a PC over the FT232H.
>>
>> The setup works, I can receive data with no data loss. However, the
>> transmission speed is well below the advertised 40 MBytes/sec. I am
>> currently receiving around 28 MBytes/sec. The FPGA is sending data as soon
>> as the TXE line goes low, so I assume the bottleneck lies within the USB
>> connection between the FT232H and the PC.
>>
>> I am running Arch Linux and have installed libftdi from the packet sources.
>> The version is reported as 1.4-2. Has anyone experienced this behavior
>> before and knows a solution?
>>
> > Below is the code I use. I do check return values, I just removed the
> checks to keep this message short.
>>
>>
> Hi,
>
> I did not read the code. Two things to consider:
> - Sync Fifo speed needs a good PC and a good USB host implementation.
> - Did you try the svnc fifo example in libftdi?
>
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