FTDI LibFT4222 - Page 59

Application Note
AN_329 User Guide For LibFT4222
Version 1.5
Document Reference No.: FT_001060 Clearance No.: FTDI#406
58
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Error code:
FT4222_DEVICE_NOT_OPENED: The initialization API is not called.
FT4222_INVALID_POINTER: Parameter pRxSize is NULL
Prerequisite:
FT4222_I2CSlave_Init
Example:
FT_HANDLE ftHandle = NULL;
FT_STATUS ftStatus;
FT4222_STATUS ft4222Status;
ftStatus = FT_Open(0, &ftHandle);
if (FT_OK != ftStatus)
{
// open failed
return;
}
// initial i2c slave
ft4222Status = FT4222_I2CSlave_Init(ftHandle);
if (FT4222_OK != ft4222Status)
{
// i2c slave init failed
return;
}
ft4222Status = FT4222_I2CSlave_SetClockStretch(ftHandle, TRUE);
if (FT4222_OK != ft4222Status)
{
// set clock stretch failed
return;
}
while(1)
{
uint16 rxSize;
if(FT4222_I2CSlave_GetRxStatus(ftHandle, &rxSize) == FT4222_OK)
{
if(rxSize>0)
{
uint8 *pRead_data = (uint8 *)malloc(rxSize) ;
uint16 sizeTransferred;
if(FT4222_I2CSlave_Read(ftHandle,pRead_data, rxSize, &sizeTransferred)==
FT4222_OK)
{
// got slave data
}
free(pRead_data);
}
}
else
{
printf("I2C slave get status error\n");
}
}
FT4222_UnInitialize(ftHandle);
FT_Close(ftHandle);