NRF54H report connected RSSI as a positive value.

[psiemek]

I found some examples on dev zone how to read RSSI during connected state:

static void read_conn_rssi(uint16_t handle, int8_t *rssi)
{
	struct net_buf *buf, *rsp = NULL;
	struct bt_hci_cp_read_rssi *cp;
	struct bt_hci_rp_read_rssi *rp;

	int err;

	buf = bt_hci_cmd_create(BT_HCI_OP_READ_RSSI, 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_READ_RSSI, buf, &rsp);
	if (err) {
		uint8_t reason = rsp ?
			((struct bt_hci_rp_read_rssi *)rsp->data)->status : 0;
		printk("Read RSSI err: %d reason 0x%02x\n", err, reason);
		return;
	}

	rp = (void *)rsp->data;
	*rssi = rp->rssi;

	net_buf_unref(rsp);
}

Function report RSSI but as a positive value around 230. How to recalculate it to dB. I see that value is getting changed (getting smaller) when I'm moving my mobile from the board. 

Przemek

[psiemek]

Hi All,

Finally I found a bug. Casting a "int8_t" variable to "int" causes that issue. Still dont know why "int" is printed as unsigned anyway now I know that it is not on Nordic side :-)


Przemek