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Missing data from real bus trace
Question
In slave mode, while reading data from “ftdi_slave_read” it is giving a data frame which is not transmitted from the opposite end. Below data is transmitted from the opposite end(line 7)
![](https://i1.wp.com/www.digiajay.com/wp-content/uploads/2020/10/image-7.png?fit=640%2C418&ssl=1)
![](https://i2.wp.com/www.digiajay.com/wp-content/uploads/2020/10/image-8.png?fit=640%2C165&ssl=1)
I feel that it taking from the FTDI chip buffer. Is there any steps or function to clear buffer data of FTDI hardware?
Answer
Scope/analyzer shows an extra nibble (one byte + a nibble) in every frame. The driver’s text file report shows only the first byte and doesn’t show the extra nibble of the frame. There could be a setting in the analyzer/scope which shows the extra nibble that confuses you.