How to send HCI command to bluetooth controller ?

[phb98]

Hello. AFAIK the cyw firmware already support bluetooth, only the software on host side does not support, so at this moment how can i send and receive raw HCI data to bluetooth controller ?
The bluedroid bluetooth stack on ESP32 is already mature, so i can port the stack from esp-idf

[peterharperuk]

I think the answer is, wait not very long and you can look at the code yourself. Duplicate of #1164

[peterharperuk]

You should be able to update to the latest version of the SDK v1.5 now.

To send a HCI command call cyw43_bluetooth_hci_write. It requires a 4-byte header. The first 3 bytes of this header are filled in for you. The final byte in the header is the hci packet type. The buffer must be 4-byte aligned. See hci_transport_cyw43_send_packet for an example of how it's used with BTstack.

When there's some BT work to be done cyw43_bluetooth_hci_process gets called by the driver. cyw43_bluetooth_hci_read reads hci data. Again it has a 4 byte header of which probably only the final byte giving the hci packet type will be of interest, see hci_transport_cyw43_process for an example.

[kilograham]

not really an issue, so closing