FTDI LibFT4222 - Get Max Transfer Size

Application Note
AN_329 User Guide For LibFT4222
Version 1.5
Document Reference No.: FT_001060 Clearance No.: FTDI#406
18
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}
}
}
FT4222_UnInitialize(ftHandle);
FT_Close(ftHandle);
3.2.8 Get Max Transfer Size
FT4222_STATUS FT4222_GetMaxTransferSize(FT_HANDLE ftHandle, uint16* pMaxSize)
Supported Chip:
FT4222 chip version
Supported
FT4222 Rev A
YES
FT4222 Rev B
YES
FT4222 Rev C
YES
FT4222 Rev D
YES
Summary:
This function returns the maximum packet size in a transaction. It will be affected by different bus
speeds, chip modes, and functions. The maximum transfer size is maximum size in writing path.
Parameters:
ftHandle
Handle of the device.
pMaxSize
Pointer to a variable of type unit16 where the returning value will be stored.
Return Value:
FT4222_OK if successful, otherwise the return value is an FT error code.
Error code:
FT4222_DEVICE_NOT_OPENED: The initialization API is not called.
FT4222_INVALID_POINTER: Parameter pMaxSize is NULL
Example:
FT_HANDLE ftHandle = NULL;
FT_STATUS ftStatus;
FT4222_STATUS ft4222Status;
uint16 maxSize;
ftStatus = FT_Open(0, &ftHandle);
if (FT_OK != ftStatus)
{
// open failed
return;
}
ft4222Status = FT4222_I2CMaster_Init(ftHandle, 1000);
if (FT4222_OK != ft4222Status)
{
// init i2c master failed
return;
}
ft4222Status = FT4222_GetMaxTransferSize(ftHandle, &maxSize);
if (FT4222_OK != ft4222Status)
{
// get max transfer size failed