Tool/software: Code Composer Studio
Hi：
I have a question about PMBUS.
please take a look at this picture:
when I use the read word: B4h, the GUI will give no answer ,and will tell me NACK
but when I use the I2C read B4h, the GUI will give me the correct answer, and tell me ACK.
I want to know Why?
Thanks very much!
Zoe
When you use I2C read, even when you set the length of data to 2, you are still using a "Block read" communication format.
In this case the number of data bytes Block Count= N = 2 is sent after the cmd byte.
But, when you use Read Word, the communication format used is a "Read word" format that does not send the 2 (number of bytes) as as extra transmission byte.
It seems like your firmware does have the implementation of "Block Read", but does not support the command B4 read word.
Hope this makes sense.
Regards,
