how to read FDA801 DB Data?

[Ssong.1]

i read the data sheet about FDA801 and try to read DB data , the data i read were all 0x00 ,But none of the speakers came through , i think there is something wrong in my process procedure . Here's how I tried it:

May I ask if this process is correct?thanks

 

if i initial FDA801 to play state , and the i read IB data ,it works:

Because it satisfies process figure 51.a

[Ssong.1]

this question has been resolved now 。

first : if you want to read IB data : set device address first and then Just call the read function

second : if you want to read DB data , importantly this step must do after you write register on DC diagnosis state ,otherwise it doesn't work : 1.set device address first and 2. send sub address 3. set device address(I test this step to work without doing it) 4.call the read function

Hoping to help others😀