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Using FT2232H in Sync FIFO mode for streaming out data

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chensx2012

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I want to use FT2232H in fifo mode for streaming out data. The external altera FPGA reads the FT2232H at a fixed rate of 48kb/s. On my PC side, what I need to do is to continuously check the number of bytes in the transmit queue. If the bytes falls below 32, the program will feed 256 bytes using FT_write. But when I use FT_GetStatus(ftHandle,@RxBytes,@TxBytes,@EventDWord), TxBytes always return 0 (unlike RxBytes which can truthfully indicate the number of bytes in the receive buffer). Any ideas? Thanks in advance!
 

Hi,

Sending out via pc has several bufferd.
Pc software buffer ... FTDI driver buffer ... FTDI transmit FIFO ... FTDI receive FIFO.

I think you read pc software buffer status. (Or FTDI drver buffer)
So as soon as you write data it is immediately in the next buffer. Mind your FTDI is a high speed USB chip with large size fifo.

Klaus
 

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