FTDI LibFT4222 - Page 41

Application Note
AN_329 User Guide For LibFT4222
Version 1.5
Document Reference No.: FT_001060 Clearance No.: FTDI#406
40
Product Page
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Supported Chip:
FT4222 chip version
Supported
FT4222 Rev A
YES
FT4222 Rev B
YES
FT4222 Rev C
YES
FT4222 Rev D
YES
Summary:
Read data from the receive queue of the SPI slave device.
Parameters:
ftHandle
Handle of the device.
buffer
Pointer to the buffer that receives the data from the device.
bytesToRead
Number of bytes to read from the device.
sizeOfRead
Pointer to a variable of type uint16 which receives the number of bytes read from
the device.
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_DEVICE_NOT_SUPPORTED: This device is not a FT4222 chip.
FT4222_IS_NOT_SPI_MODE: The device is not in spi slave mode.
FT4222_INVALID_POINTER: The parameter buffer or sizeOfRead is NULL.
FT4222_INVALID_PARAMETER: Parameter bytesToRead is equal to zero.
Prerequisite:
FT4222_SPISlave_InitEx or FT4222_SPISlave_Init
Example:
FT_HANDLE ftHandle = NULL;
FT_STATUS ftStatus;
FT4222_STATUS ft4222Status;
ftStatus = FT_OpenEx("FT4222 A",FT_OPEN_BY_DESCRIPTION, &ftHandle);
if (FT_OK != ftStatus)
{
// open failed
return;
}
if (FT4222_OK != FT4222_SPISlave_InitEx(ftHandle, SPI_SLAVE_NO_PROTOCOL))
{
// init spi slave failed
return;
}
uint16 sizeTransferred = 0;
uint16 rxSize;
std::vector<unsigned char> recvBuf;
while(1)
{
if(FT4222_SPISlave_GetRxStatus(ftHandle, &rxSize) == FT4222_OK)
{