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Author Topic: Would need to know more details about the FT_Write() function  (Read 586 times)

mosi

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Would need to know more details about the FT_Write() function
« on: November 07, 2018, 08:38:51 PM »

A question about the FT_Write() function.

Code: [Select]
FT_STATUS FT_Write (FT_HANDLE ftHandle, LPVOID lpBuffer, DWORD dwBytesToWrite, LPDWORD lpdwBytesWritten)

I wonder about the lpdwBytesWritten.

When will it ever return lpdwBytesWritten < dwBytesToWrite? Would FT_Write return other than FT_OK in that case?

And how much data can I send in one call to FT_Write? What limit has the dwBytesToWrite parameter?

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Re: Would need to know more details about the FT_Write() function
« Reply #1 on: November 09, 2018, 04:34:06 PM »

Hello,

Please see the D2XX Programmer's Guide for all available information.

dwBytesToWrite is DWORD type. This is an unsigned, 32-bit unit of data. It can contain an integer value in the range 0 through 4,294,967,295.

FT_Write would return with an error code other than FT_OK if it's not completed successfully.
Error codes can be found in Appendix A - Type Definitions.

You may also want to set FT_SetTimeouts which sets the read and write timeouts for the device.

Please also take a look at AN232B-04 Data Throughput, Latency & Handshaking which provides additional useful information and applies to all our FTDI USB products.

Best Regards,
FTDI Community
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