Some questions about bluetooth

[Boss_crab]

Hi! nordic,

I am using nRF52840 and NCS v2.5.0.

I have some questions about bluetooth.

1.about channel map

when I simply read the channel map through a function, it looks like this:

function:

result:

It seems correct, but the order is different from the Bluetooth manual.

Then, I use the function  bt_le_set_chan_map()

to set the channel map, but the channel map read out doesn't match the one I set. I can't figure it out.

2.How to update PHY in connection？For example, if I want to change the TX PHY during the transmission process from tx_phy = 1 (1M) to 2M or coded S8, what should I do? Are there any relevant examples?

3.Is there an example of extended advertising?

[Amanda Hsieh]

Hi, 

1. I cannot find the read_channel_map function in NCS. What NCS version are you using? What sample are you using and where is it from?

2. You can refer to the BLE Throughput sample. 

3. The periodic_adv sample under zephyr/samples/bluetooth is a good example of BLE extended advertising.

Regards,
Amanda H.

[Boss_crab]

Hi！Amanda H，

this is read_channel_map（）：

code：

static void read_channel_map(uint16_t handle, struct bt_hci_rp_le_read_chan_map *map_data)

{

    struct net_buf *buf, *rsp = NULL;

    struct bt_hci_cp_le_read_chan_map *cp;

    struct bt_hci_rp_le_read_chan_map *rp;

    int err;

    buf = bt_hci_cmd_create(BT_HCI_OP_LE_READ_CHAN_MAP, sizeof(*cp));

    if (!buf) {

        printk("Unable to allocate command buffer\n");

        return;

    }

    cp = net_buf_add(buf, sizeof(*cp));

    cp->handle = sys_cpu_to_le16(handle);

    err = bt_hci_cmd_send_sync(BT_HCI_OP_LE_READ_CHAN_MAP, buf, &rsp);

    rp = (void *)rsp->data;

    *map_data = *rp;

    net_buf_unref(rsp);

}

I wrote based on the get_tx_power function in the hci_pwr_ctrl project.

[Amanda Hsieh]

Hi, 

The bt_le_set_chan_map() function is used for central devices to set a channel map in a connection. Could you test the code with the central sample under zephyr\samples\bluetooth and connect with the peripheral sample under zephyr\samples\bluetooth? You also could take a look at this post. 

-Amanda H.