FTDI LibFT4222 - I 2 C Master Read Extension

Application Note
AN_329 User Guide For LibFT4222
Version 1.5
Document Reference No.: FT_001060 Clearance No.: FTDI#406
51
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FT4222_INVALID_POINTER: Parameter buffer is NULL
FT4222_INVALID_PARAMETER: bytesToWrite is equal to zero
FT4222_FAILED_TO_WRITE_DEVICE: Failed to write data.
Prerequisite:
FT4222_I2CMaster_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 master with 1000K bps
ft4222Status = FT4222_I2CMaster_Init(ftHandle, 1000);
if (FT4222_OK != ft4222Status)
{
// i2c master init failed
return;
}
const uint16 slaveAddr = 0x22;
uint8 write_req[1];
uint8 recvBuf[16];
uint16 sizeTransferred = 0;
write_req[0] = 0x00; // addr
ft4222Status = FT4222_I2CMaster_WriteEx(ftHandle, slaveAddr, START, &write_req[0], 1,
&sizeTransferred);
if (FT4222_OK == ft4222Status)
{
// write data success
}
else
{
// write data failed
}
ft4222Status = FT4222_I2CMaster_ReadEx(ftHandle,slaveAddr, Repeated_START | STOP,
&recvBuf[0], 16, &sizeTransferred);
if (FT4222_OK == ft4222Status)
{
// read data success
}
else
{
// read data failed
}
FT4222_UnInitialize(ftHandle);
FT_Close(ftHandle);
3.6.5 I
2
C Master Read Extension
FT4222_STATUS FT4222_I2CMaster_ReadEx(FT_HANDLE ftHandle, uint16 deviceAddress, uint8
flag, uint8* buffer, uint16 bytesToRead, uint16* sizeTransferred).