Hello,

Here is some feedback from our R&D team:

FT4222H SPI Slave can only receive bytes.
It cannot accept bit transmission.

The workaround might be for the SPI master to send additional dummy bits.

Best Regards,
FTDI Community

Hi John,

we have some HID precompilied firmware that can help you. The HID firmware for VNC2 are for host port 1. The precompiled firmware can be found on our website https://ftdichip.com/firmware/precompiled/. You should have a look at AN 193 VNC2 SPI Master to USB HID Class Host Bridge. there are other HID class firmware, however i believe this one will be most rlevent to you.

Best Regards

FTDI Community

LibMPSSE 1.0.3 has now been released to the website:

https://ftdichip.com/software-examples/mpsse-projects/

Note v1.0.3 has a known bug which will be fixed in a future version.

The code is not sending I2C ACK after 1st byte read.

Please check this bit of code in particular:

static FT_STATUS I2C_Read8bitsAndGiveAck(FT_HANDLE handle, uint8 *data, bool ack)
{
    FT_STATUS status = FT_OTHER_ERROR;
    uint8 buffer[20], inBuffer[5];
    uint32 noOfBytes = 0;
    DWORD noOfBytesTransferred;
    FN_ENTER;

    /*set direction*/
    buffer[noOfBytes++] = MPSSE_CMD_SET_DATA_BITS_LOWBYTE;/* MPSSE command */
    buffer[noOfBytes++] = VALUE_SCLLOW_SDALOW; /*Value*/
    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAIN; /*Direction*/
    /*Command to read 8 bits*/
    buffer[noOfBytes++] = MPSSE_CMD_DATA_IN_BITS_POS_EDGE;
    buffer[noOfBytes++] = DATA_SIZE_8BITS;/*0x00 = 1bit; 0x07 = 8bits*/
    /*Command MPSSE to send data to PC immediately */
    buffer[noOfBytes++] = MPSSE_CMD_SEND_IMMEDIATE;
    /* Fix introduced to solve a glitch issue */
    buffer[noOfBytes++] = MPSSE_CMD_SET_DATA_BITS_LOWBYTE; 
    buffer[noOfBytes++] = VALUE_SCLLOW_SDALOW ;
    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAIN;                                                                                                     

    /* Burn off one I2C bit time */
    buffer[noOfBytes++] = MPSSE_CMD_DATA_OUT_BITS_NEG_EDGE;
    buffer[noOfBytes++] = 0; /*0x00 = 1bit; 0x07 = 8bits*/ 
    buffer[noOfBytes++] = ack ? SEND_ACK : SEND_NACK;/*Only MSB is sent*/

SDA has been left as input:

    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAIN;   

But this should actually be output:

    buffer[noOfBytes++] = DIRECTION_SCLOUT_SDAOUT; 

Best Regards,
FTDI Community

Hello,

Which version of the V2DPS firmware are you using?

Note that there is also an SP3 patch for the IDE available:

https://www.ftdicommunity.com/index.php?topic=731.0

V2DPS firmware is provided with the IDE which allows customers to customise and debug the firmware:

C:\Users\Username\Documents\FTDI\Firmware\Samples\V2.0.2-SP2\VNC1L\V2DPS

So it might be worthwhile building the latest version of the code with the IDE and SP3 patch.

Otherwise the hub might not be compatible with the firmware or IC.
Also note that VNC2 only has USB Full Speed Controllers inside the IC.

Best Regards,
FTDI Community

Hello,

This is the FTDI Community.

For EVE related questions please post on our Bridgetek Community:

www.brtcommunity.com

Best Regards,
FTDI Community

Hi
The FT260 is a HID class device, so 64K interrupt transfer on the FT260.  The FT4222 part is perhaps a better option if you are looking for a bulk data transfer     
https://ftdichip.com/wp-content/uploads/2020/08/AN_395_User_Guide_for_LibFT260.pdf

Regards
FTDI Community

Hi,
Can you clairfy, what open source client software' are you using?  Have you tried with a terminal programs like PuTTY or Coolterm?
The application has to specify CTS/RTS support. It can be selected with those two terminals mentioned above.   

Regards
FTDI Community

Hello,

All information on the VNC2 tools can be found in AN_151 Vinculum II User Guide:

https://ftdichip.com/wp-content/uploads/2020/08/AN_151_Vinculum-II_User_Guide.pdf

The asm error is a value of >255 being loaded into an 8 bit register.
The ASM file can have line numbers from the original C code inline.
Please check the command line options for VinC.exe:

VinC.exe
VinC [options] [file ...] [-L linker options]

  -E            Run the pre-processor and stop.
  -S            Stop processing after pre-processing and compilation.
  -c            Pre-process, compile and assemble but do not invoke linker.
  -O level      Specify optimisation for compiler.
  -d level      Specify debug output level for compiler.
  -D macro=defn Defines macro with optional defn in preprocessor.
  -U macro      Undefines macro in preprocessor.
  -I dir        Add a search directory for include files.
  -o file       Specify output filename.
  -l file       Specify log filename.
  --save-temps  Save all temporary files.
  --save-temp   Save temporary files: 'a' assembler, 'i' preprocessor,
                'o' object.
  --combine     Combine source files on command line into single input file
                for compiling.
  --library     Create a single output file for all source files on command
                line.
  -v            Verbose output of command lines for tools.
  -q            Quieten output of command lines for tools.
  --version     Display tool version.
  --all-versions        Display all tool versions.
  --max-warn limit      Limit the number of warnings displayed.
  --max-err limit       Limit the number of errors displayed.
  --help        Display this help message.
  -L            Process all following options as linker options.
The bin file can be up to 256 kB - 4 kB.

Best Regards,
FTDI Community