Sending message from application CPU to network CPU

[selvam]

Hi Nordic Leaders,

Regarding nRF5340 and nRF connect SDK

Objective:  Update blue tooth data transfer rate between 1Mbps and 2 Mbps.

Details:

As it is not possible to access network CPU register from application side, We planned below steps:

1. Write own API Say func_datarate() at network CPU side to access network CPU register and update blue tooth data transfer rate  . 

2. Send of message as few bytes of date from application CPU to network CPU.

3. Then pass the required byte to the created API func_datarate() to update blue tooth data transfer rate ,

As my understanding, for the step 2 is we planned to use rpmsg service files (like rpmsg.c, rpmsg_nRF53.c ..etc).

Please correct us, if this is incorrect. 

If correct which of below API shall be used for few data bytes(which is not to be transferred as Bluetooth data) transfer from application CPU to network CPU.

1. static int bt_rpmsg_send(struct net_buf *buf).

2. int bt_rpmsg_platform_send(struct net_buf *buf)

3. int rpmsg_service_send(int endpoint_id, const void *data, size_t len)

Please suggest.a solution to Update blue tooth data transfer rate between 1Mbps and 2 Mbps.

Thanks

Selvam

 

[Hung Bui]

Hi Selvam,

I'm not 100% sure why you need to access the rpmsg API to request PHY update. 

Can't you just call: bt_conn_le_phy_update() function with either BT_GAP_LE_PHY_1M or BT_GAP_LE_PHY_2M in the application core to update ? 

You can have a look at the \nrf\samples\bluetooth\throughput\ example to see how it works.