Hi,

This is a known issue, and there is a fix. if you send an email to support1@ftdichip.com, we can send you a fixed version.

Best Regards
FTDI Community

You should fix these bugs.  I just ran into similar issues.

I downloaded the DLL libraries, examples, and source code from the following link
https://ftdichip.com/software-examples/mpsse-projects/libmpsse-i2c-examples/

After running the code I noticed that the library is having an issue reading the ACK bit.

In the attached scope capture, the slave successfully acknowledges the 9th bit.  However, the FTDI device does not see it.

In LibMPSSE-I2C, I noticed there's a function called: static FT_STATUS I2C_Write8bitsAndGetAck(FT_HANDLE handle, uint8 data, bool *ack)

The function appears to call

status = FT_Channel_Write(I2C, handle, noOfBytes, buffer, &noOfBytesTransferred);
which writes a byte a data along with the 9th clock for the acknowledge bit.

For some reason, the code then calls this
{/*Get ack*/
noOfBytes = 1;
noOfBytesTransferred = 0;
INFRA_SLEEP(1);
status = FT_Channel_Read(I2C, handle, noOfBytes, inBuffer,
&noOfBytesTransferred);
I'm confused about the /*Get Ack*/ code.  Exactly where does the I2C library read the ACK bit?

From what I can tell the library reads the acknowledge bit AFTER the 9th clock.  Is this correct?

Based on my understanding of I2C, this is the wrong time to read the acknowledge bit.

Hi,
If you use FT_SetBitMode to reset (zero for reset)   
https://ftdichip.com/wp-content/uploads/2023/09/D2XX_Programmers_Guide.pdf (Page 66, D2xx programmers guide)

Regards
FTDI Community

Hi,

I realized that the only option I have is to use bitbang mode and implement the UART protocol myself. It's not a problem, I just need to send 10 bytes for every byte I actually wanted to send. However, when I use FT_SetBaudRate() to set the UART speed, the resulting speed is 5 times faster than I expected. So to get 115200 I have to call FT_SetBaudRate(115200/5). What am I doing wrong?

Regards,
Slava

Hello,

There are no issues with changing the Manufacturer/Description/Serial string without change VID/PID.

Best Regards,
FTDI Community

I need to use port A of the FT4232H in all I2C/SPI/JTAG/UART modes and switch between them in software. I don't see any problem in switching between I2C/SPI/JTAG, but I don't understand how to switch it from I2C to UART. Please help!

Regards,
Slava

I haVe aN electronic board with a FTDI Chip.

Using FT_Prog I can change the Manufacturer/Description/Serial string without change VID/PID. Is it legal with USB Org directive?

I checked everywhere but I didn't find no mention regarding the change about the topic.

Colud someone clarify this question?

Marco

Hello,

Please provide the USBView details and screenshot for analysis.

Please send this via email to your local support team:

https://ftdichip.com/technical-support/

Best Regards,
FTDI Community

Great, Thanks!