nRF5340 - setting public bt address

Question

Hello, 
 Still on my custom nRF5340 board for a Bluetooth LE peripheral application (building environment: NCS 2.2.0, Zephyr 3.2.99). The net core is populated with the Zephyr HCI RPMsg sample LE Controller as it is. I don't want to change it if possible. 
 The problem is how to move from working random address to public address for advertising ? I've found a couple of functions around, namely bt_ctlr_set_public_addr() and sdc_hci_cmd_vs_zephyr_write_bd_addr(). However, for a reason or another things mess up. 
 To start clean, and depending on my case of use, can anyone pass a recipe in terms of 
 1. API name 2. prj.conf configs 3. include file(s) 
 Thank you very much

Gabriele · Accepted Answer

I've solved as follows, strongly inspired to link.

#include <zephyr/bluetooth/hci_vs.h>

static char bt_mac_buf[BT_ADDR_LE_STR_LEN];

void ble_set_mac(bt_addr_t* addr)
{
	struct net_buf *buf;
	int rc;

	buf = bt_hci_cmd_create(BT_HCI_OP_VS_WRITE_BD_ADDR, sizeof(*addr));
	if (!buf) {
		LOG_ERR("failed to create buffer [%d]", -ENOBUFS);
	}

	net_buf_add_mem(buf, addr, sizeof(*addr));

	rc = bt_hci_cmd_send_sync(BT_HCI_OP_VS_WRITE_BD_ADDR, buf, NULL);
	if (rc) {
		LOG_ERR("failed to set BT address [%d]", rc);
	}
}

int ble_init(void)
{
	bt_enable(NULL);

	/* check for public address in UICR.OPT area */
	if(NRF_UICR->OTP[0] != 0xffffffff && \
			NRF_UICR->OTP[1] != 0xffffffff) {
		LOG_INF("setting public address retrieved from UICR");
		bt_addr_t addr;
		uint8_t tmp[BT_ADDR_SIZE];
		int i;
		memcpy(&tmp[0], (uint8_t *)&NRF_UICR->OTP[0], BT_ADDR_SIZE);
		for (i=0; i < BT_ADDR_SIZE; i++) {
			addr.val[i] = tmp[BT_ADDR_SIZE - i -1];
		}

		ble_set_mac(&addr);

	} else {
		LOG_INF("going to set random static address");
	}

	if (IS_ENABLED(CONFIG_SETTINGS)) {
		settings_load();
	}
}

nRF5340 - setting public bt address

Top Replies