Hi,
Our project is related to bringup CC2540 BT chip in NetBSD platform. In the client hardware, Atheros SOC and CC2540 BT chip are connected. CC2540 BT chip is communicating through High speed UART interface (UART1). UART1 is part of Atheros SoC.
We ensured that High speed UART registers are set appropriately.
a. On starting bluetooth using btattach, btconfig, btdevctl commands in NetBSD platform, we could observe the below behavior.
i) Bluetooth stack HCI, L2CAP, RFCOMM are getting initialized properly in NetBSD platform.
ii) HS UART dev is getting created.
iii) Btuart line discipline is initialized properly.
Issue observed:
b. On sending HCI command to read BDADDR (BT Device address) or reset hardware,
i) We were able to observe that the data written to UART FIFO is successful (Ensured only with no failure return).
ii) No Acknowledgement is received for written data from BT chip. We expect Rx interrupt as an acknowledgement from the BT chip to UART1 to post HCI command completion event.
c. We have confirmed that there is NO communication happening from UART to BT chip using oscilloscope by probing in rx/tx test points.
As per schematics, HSUART Rx/Tx are connected to P0_2 and P0_3 respectively.
In UART registers, we ensure
- No flow control
- Baud rate is 460800
Do we need to wake up BT chip by any other means ? What all the possible ways to ensure whether BT chip receives the sent data. Please provide your inputs to resolve this issue.
Thanks & Regards,
Vennila
