Now i cann't get the right value from any register use command 0x04.
I think the busy line is right.
I describe my trouble in attachment in detail.
Thanks for your help.
The content of the register is returned in the 4 byte response.
Yes, but i cann't get the right response.
I saw you only receive one byte.
According to the datasheet, this is the recommendation for the BUSY line handling by the host:1. Assert NSS to Low2. Perform Data Exchange3. Wait until BUSY is high4. Deassert NSS5. Wait until BUSY is low
Have you try to read/write the other register? e.g. system_config
Yes,other registers are 0xffffffff also.
Now i want to send 0x04 command to get the 32bit of 0x00 register.
After send 0x04, i can find busy line has become high,Now i want to know if i should Deassert NSS to let busy line recover low.And then i can send 0x00 to get the response.
For i know if busy line is high,PN5180 cann't get 0x00 data.
The BUSY line is used to indicate that the system is BUSY and cannot receive any datafrom a host. Recommendation for the BUSY line handling by the host:1. Assert NSS to Low2. Perform Data Exchange3. Wait until BUSY is high4. Deassert NSS5. Wait until BUSY is low
i want to know Perform Data Exchange is send 0x04+0x00+32bit response or only send 0x04.
Because after i send 0x04,the busy has become high.
Yes, when BUSY is high, need to deassert the NSS.
Retrieving data ...