616
Discussion - Drivers / Re: FT4222_I2CMaster_Write sizeTransferred returning 4 extra bytes.
« on: August 29, 2019, 09:14:43 AM »
Hello,
In general with USB full speed 64 bytes transfer package is made up of 2 status bytes and 62 user bytes.
Note this is 512 maximum transfer package size for USB high speed like the FT4222H.
The two bytes 02 60 are the status bytes required by the D2XX driver.
The status bytes are for the driver and should be invisible to the user application and is handled by the driver.
Which version of LibFT4222 are you using? Which version of the D2XX driver are you using?
The latest are v1.4.2 and 2.12.28 respectively (for Windows).
Which FT4222H IC revision are you using?
Have you tested out the I2C examples provided with LibFT4222?
Best Regards,
FTDI Community
In general with USB full speed 64 bytes transfer package is made up of 2 status bytes and 62 user bytes.
Note this is 512 maximum transfer package size for USB high speed like the FT4222H.
The two bytes 02 60 are the status bytes required by the D2XX driver.
The status bytes are for the driver and should be invisible to the user application and is handled by the driver.
Which version of LibFT4222 are you using? Which version of the D2XX driver are you using?
The latest are v1.4.2 and 2.12.28 respectively (for Windows).
Which FT4222H IC revision are you using?
Have you tested out the I2C examples provided with LibFT4222?
Best Regards,
FTDI Community