Buffing Blocks

Buffing Blocks

Interaction with FTDI

What FTDI chip?

FTDI chips are chips that are developed by International Future devices Technology (href = "http://www.ftdichip.com/" http://www.ftdichip.com/>).

FTDI chips are used in USB adapters connect the hardware FIFO RS232 and parallel interfaces. The most common use is the USB-2-COM interface.

They are used in:

1. Mobile phone cables.
   Mobile phones have RS232 or UART output, and the PC can have only one USB port, the chip converts RS232 to USB. And the driver is installed on the PC creates the virtual device (usually a virtual COM port), which is used for communication.
2. Service Boxes
   These tools are used by service centers and repair telephone service car repair. These are the devices that are connected to the PC via USB, and - on the other side - for different materials.
3. Hardware Debuggers (JTAG)
4. Any other device to be connected through USB to a PC and has the RS232 port on the other side.

How do I know if the device is based on FTDI?

Well, you can disassemble it and read the labels on the chips, but it is not the way you want. There are more humane method.

There are original drivers on the FTDI site. If you look at the files that are included in the driver package there will be such a set file:

So if your camera has one of these files in the list of drivers it is based on FTDI.

To see the drivers for the device:

1. Go to Device Manager
2. Select the device
3. Open the context menu and select Properties
4. Switch to the driver and click Driver Details.

For example:

This device FTD2XX.dll the pilot has the file list. And the condition name is FTDI. This device is based on FTDI. Some manufacturers may rename the driver (. Sys), but information Copyright reveal the manufacturer of the actual driver.

How to interact with it?

Fortunately, FTDI provides the API. There is a generic set of APIs that can be used with all FTDI chips.

API is provided through FTD2XX.dll. This is a DLL that interacts with FTD2XX.SYS driver.

There is a header file and library file in the FTDI driver package: ftd2xx.h ftd2xx.lib and files.

The. Lib is the COFF format, so it can be used in Visual Studio without any problems.

FTDI API usage

The API set has two interfaces "classical" (functions "FT_" prefix) and "Win32 API "(functions" FT_W32_ "prefix).

"Classic" is cross-platform interface.

"Win32 API" is a set of Windows functions only. Windows API is very similar, which is used to work with serial ports. So porting the code for functions FTDI is quite simple.

The main functions are:

FT_W32_CreateFile () / FT_OpenEx ()
Open the handle to the specified connection FTDI Chip

FT_W32_WriteFile () / FT_Write ()
Sends data on the virtual COM port.

FT_W32_ReadFile () / FT_Read ()
Bed data from virtual COM port

FT_W32_CloseHandle () / FT_Close ()
Closes connection.

There are functions to configure the port:

FT_SetBaudRate ()
Sets the transmission speed for the connection

FT_SetDataCharacteristics ()
Sets the number of bits in byte, parity, etc.

FT_ClrDtr ()
Clear the DTR signal on the virtual COM port

FT_SetDtr ()
Set DTR on the virtual COM port

FT_ClrRts ()
Clear the RTS signal on the virtual COM port

FT_SetRts ()
RTS goes on the virtual COM port

etc.

For Windows there is no limitation on the use of Win32 API functions and classical together. Thus, you can combine.

Opening the virtual serial port

There are several ways to open the FTDI device: by index, by description, by serial number, by location. These types of information can be used to open the device via FT_W32_CreateFile ();.

For information on devices connected FT_ListDevices () should be used.

Example:

ftStatus FT_ListDevices = (0, buf, FT_LIST_BY_INDEX | FT_OPEN_BY_SERIAL_NUMBER);
if (= ftStatus! FT_OK) / / Returns the first production aircraft
{
printf ("Can not to obtain the device name FTDI ");
return 0;
}

ftHandle FT_W32_CreateFile = (Buf,
GENERIC_READ | GENERIC_WRITE,
0,
0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED | FT_OPEN_BY_SERIAL_NUMBER,
0) / / Open the device by serial number

There are several functions that can provide additional information on the connected devices:

FT_GetDeviceInfoList (), FT_CreateDeviceInfoList (), FT_GetDeviceInfoDetail (), etc.

Setting up the port

The code to set the parameters typical serial port to 115200 bps, 8 bits per byte, 1 stop bit and no parity should look like this:

ftStatus = FT_SetBaudRate (FtHandle, FT_BAUD_115200);

ftStatus FT_SetDataCharacteristics = (ftHandle,
FT_BITS_8,
FT_STOP_BITS_1,
FT_PARITY_NONE);

ftStatus FT_ClrDtr = (ftHandle);
ftStatus FT_SetDtr = (ftHandle);

Also there are functions to configure the port in the style of Windows:

FT_W32_GetCommState (), FT_W32_SetCommState (), FT_W32_SetupComm (), etc.

Reading and writing

The use of functions FT_W32_WriteFile () and FT_W32_ReadFile () is similar to WriteFile () and ReadFile (). If the handle is open OVERLAPPED mode, the functions are asynchronous, otherwise they are synchronous. Thus reading and writing can be done in a standard way:

DWORD Written = 0;
unsigned char cmd []={' A ',' T ',' r ',' n '};
ftStatus FT_W32_WriteFile = (ftHandle, cmd, sizeof (cmd), and writing & OVL);
if (WaitForSingleObject (Ovl.hEvent, INFINITE)! = WAIT_OBJECT_0)
throw std:: exception ("Error writing waiting to complete ");
unsigned char buf [250];
ftStatus FT_W32_ReadFile = (ftHandle, Buf, sizeof (Buf), & TotalRead, & OVL);
if (WaitForSingleObject (Ovl.hEvent, 1000)! = WAIT_OBJECT_0)
throw std:: exception ("Error waiting read operation");

EEPROM programming

There are also APIs that allow you to program FTDI Chip. FTDI Chip EEPROM within it. EEPROM containing the block parameters and chip block the user area. You can read and write two of these blocks.

Warning! Programming EEPROM is dangerous driving. Writing invalid data can cause incorrect work of the unit. You do so at your own risk.

API

The API for managing block user area:

FT_EE_UASize ()
Gets the size of the user.

FT_EE_UAWrite ()
Write data to the Space User.

FT_EE_UARead ()
Read Data User Area

Playing area is quite simple:

UASize DWORD = 0;
FT_EE_UASize (ftHandle, & UASize);

UCHAR * pUAData = new UCHAR [UASize];
SizeRead DWORD = 0;
ftStatus FT_EE_UARead = (ftHandle, pUAData, UASize, & SizeRead);

The API to manage the entire EEPROM:

FT_EE_Program ()
Writing to the EEPROM structure special (FT_PROGRAM_DATA), which contains the chip

FT_EE_ProgramEx ()
Writing to the EEPROM special structure (FT_PROGRAM_DATA) which contains the chip, but USB String descriptors are transmitted separately from the structure FT_PROGRAM_DATA

FT_WriteEE ()
Written EEPROM data directly.

FT_EE_Read ()
FT_PROGRAM_DATA bed structure from data EEPROM.

FT_EE_ReadEx ()
Bed FT_PROGRAM_DATA the structure of the EEPROM data and USB String descriptors are transmitted separately

FT_ReadEE ()
Reads EEPROM data directly

FT_EraseEE ()
Erase EEPROM Contents

Dumping EEPROM

Dumping EEPROM is a little tricky, because some chips have internal EEPROM, and some may have an external.

Quote:

The FT2232C supports 93C46 (64 x 16 bit), 93C56 (128 x 16 bit) and 93C66 (256 x 16 bits) EEPROM.

So there may be different sizes.

Here is an example of dumping for 64 x 16 bit EEPROM:

EEPromData WORD [0x40] = {0};
DWORD offset = 0;
while (offset <(sizeof (EEPromData) / sizeof (WORD)))
{
MOT DataChunk = 0;
ftStatus FT_ReadEE = (ftHandle, Offset & EEPromData [offset]);
if (= ftStatus! FT_OK)
break;
Offset + +;
}

Here's a tip seconds. If you look at the function declaration for FT_ReadEE:

FTD2XX_API
FT_STATUS WINAPI FT_ReadEE (
FT_HANDLE ftHandle,
DWORD dwWordOffset,
LPWORD lpwValue
);

dwWordOffset argument is actually the index of the word value to EEPROM, not the shift in the meaning of "data gap".

The data in the block parameters

The parameter block contains VID and PID of USB device, so if it has changed, the device will be treated like any other device. The default values ​​of the VID and PID for FTDI chip are 0x0403 0x6001 and consequently, these values ​​are overwritten by the manufacturers devices.

The parameter block contains the strings from the product description (USB String descriptors): Manufacturer, manufacturer's ID and Description. Also there is the device number series, which can be modified by EEPROM programming.

Attention again! Changing the setting the EEPROM can also cause failure of the software, if invalid data is written into the EEPROM.

Download the sample source code for FTDI interaction.

Connections

Information on the FTDI chip cards can be found in part of FTDI official website:
http://www.ftdichip.com/Documents/DataSheets.htm

Additional information about the API can be found in FTD2XX Programming Manual:
http://www.ftdichip.com/Documents/ProgramGuides/D2XXPG34.pdf

Driver Package:
http://www.ftdichip.com/Drivers/D2XX.htm

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