NRF52832 ble detection issue

RE: NRF52832 ble detection issue

Jared — Wed, 13 Dec 2023 13:33:24 GMT

[quote user="d3fine"]

Now the code is stuck in log_backend_rt.c

while (SEGGER_RTT_HasDataUp(CONFIG_LOG_BACKEND_RTT_BUFFER) &&

host_present) {

on_failed_write(retry_cnt--);

[/quote]

Ok, I can't make sense out of that. but you need to address the other stuff I pointed out as well,

regards

Jared

RE: NRF52832 ble detection issue

d3fine — Wed, 13 Dec 2023 11:32:09 GMT

I also soldered a low-frequency crystal and parallel capacitors

RE: NRF52832 ble detection issue

d3fine — Wed, 13 Dec 2023 11:30:45 GMT

Now the code is stuck in log_backend_rt.c

while (SEGGER_RTT_HasDataUp(CONFIG_LOG_BACKEND_RTT_BUFFER) &&

host_present) {

on_failed_write(retry_cnt--);

}

RE: NRF52832 ble detection issue

Jared — Wed, 13 Dec 2023 10:33:20 GMT

Hi,

The clock will automatically be chosen by one of the Kconfigs that you provide, looking at your schematic there is multiple points that should be addressed:

The high frequency crystal needs parallel load capacitors
You need to replicate the same size for the matching components as in the reference design that means 0.8 pF and 3.9 nH,
You do not have decoupling on VDD
You're missing an inductor for the DC/DC

reference design:

Try setting CONFIG_BOARD_ENABLE_DCDC=n in the project config and see if it works,

regards

Jared

RE: NRF52832 ble detection issue

d3fine — Wed, 13 Dec 2023 08:52:08 GMT

And how can i set up clocking using an external high-frequency crystal correctly?

RE: NRF52832 ble detection issue

d3fine — Wed, 13 Dec 2023 07:58:23 GMT

Hello!

I flashed and ran the beacon example. No errors occurred, and the device consumes 13-15 milliamperes. However, the phone does not detect it. In the debugger, the code executes from start to finish without errors. Also used CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y.

Code:

/* main.c - Application main entry point */

/*
 * Copyright (c) 2015-2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr/types.h>
#include <stddef.h>
#include <zephyr/sys/printk.h>
#include <zephyr/sys/util.h>

#include <zephyr/bluetooth/bluetooth.h>
#include <zephyr/bluetooth/hci.h>

#define DEVICE_NAME CONFIG_BT_DEVICE_NAME
#define DEVICE_NAME_LEN (sizeof(DEVICE_NAME) - 1)

/*
 * Set Advertisement data. Based on the Eddystone specification:
 * https://github.com/google/eddystone/blob/master/protocol-specification.md
 * https://github.com/google/eddystone/tree/master/eddystone-url
 */
static const struct bt_data ad[] = {
    BT_DATA_BYTES(BT_DATA_FLAGS, BT_LE_AD_NO_BREDR),
    BT_DATA_BYTES(BT_DATA_UUID16_ALL, 0xaa, 0xfe),
    BT_DATA_BYTES(BT_DATA_SVC_DATA16,
              0xaa, 0xfe, /* Eddystone UUID */
              0x10, /* Eddystone-URL frame type */
              0x00, /* Calibrated Tx power at 0m */
              0x00, /* URL Scheme Prefix http://www. */
              'z', 'e', 'p', 'h', 'y', 'r',
              'p', 'r', 'o', 'j', 'e', 'c', 't',
              0x08) /* .org */
};

/* Set Scan Response data */
static const struct bt_data sd[] = {
    BT_DATA(BT_DATA_NAME_COMPLETE, DEVICE_NAME, DEVICE_NAME_LEN),
};

static void bt_ready(int err)
{
    char addr_s[BT_ADDR_LE_STR_LEN];
    bt_addr_le_t addr = {0};
    size_t count = 1;

    if (err) {
        printk("Bluetooth init failed (err %d)\n", err);
        return;
    }

    printk("Bluetooth initialized\n");

    /* Start advertising */
    err = bt_le_adv_start(BT_LE_ADV_NCONN_IDENTITY, ad, ARRAY_SIZE(ad),
                  sd, ARRAY_SIZE(sd));
    if (err) {
        printk("Advertising failed to start (err %d)\n", err);
        return;
    }


    /* For connectable advertising you would use
     * bt_le_oob_get_local().  For non-connectable non-identity
     * advertising an non-resolvable private address is used;
     * there is no API to retrieve that.
     */

    bt_id_get(&addr, &count);
    bt_addr_le_to_str(&addr, addr_s, sizeof(addr_s));

    printk("Beacon started, advertising as %s\n", addr_s);
}

int main(void)
{
    int err;

    printk("Starting Beacon Demo\n");

    /* Initialize the Bluetooth Subsystem */
    err = bt_enable(bt_ready);
    if (err) {
        printk("Bluetooth init failed (err %d)\n", err);
    }
    return 0;
}

RE: NRF52832 ble detection issue

Jared — Tue, 12 Dec 2023 14:54:26 GMT

Hi,

Can you start with something easier such as the unmodified beacon sample in the sdk?

Can you verify that you're able to flash and run the sample without it asserting?

regards
Jared

RE: NRF52832 ble detection issue

d3fine — Tue, 12 Dec 2023 14:27:16 GMT

Thanks for the help. I added CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y in proj.conf and now debug mode is working properly, and there are no errors occurring during code execution. However, the phone still cannot detect the device. Here is the code I am using:

/* main.c - Application main entry point */

/*

*

* SPDX-License-Identifier: Apache-2.0

*/

#include <zephyr/types.h>

#include <stddef.h>

#include <zephyr/sys/printk.h>

#include <zephyr/sys/util.h>

#include <zephyr/bluetooth/bluetooth.h>

#include <zephyr/bluetooth/hci.h>

static uint8_t mfg_data[] = { 0xff, 0xff, 0x00 };

static const struct bt_data ad[] = {

BT_DATA(BT_DATA_MANUFACTURER_DATA, mfg_data, 3),

};

static void scan_cb(const bt_addr_le_t *addr, int8_t rssi, uint8_t adv_type,

struct net_buf_simple *buf)

{

mfg_data[2]++;

}

int main(void)

{

struct bt_le_scan_param scan_param = {

.type = BT_HCI_LE_SCAN_PASSIVE,

.options = BT_LE_SCAN_OPT_NONE,

.interval = 0x0010,

.window = 0x0010,

};

int err;

printk("Starting Scanner/Advertiser Demo\n");

/* Initialize the Bluetooth Subsystem */

err = bt_enable(NULL);

if (err) {

printk("Bluetooth init failed (err %d)\n", err);

return 0;

}

printk("Bluetooth initialized\n");

err = bt_le_scan_start(&scan_param, scan_cb);

if (err) {

printk("Starting scanning failed (err %d)\n", err);

return 0;

}

do {

k_sleep(K_MSEC(400));

/* Start advertising */

err = bt_le_adv_start(BT_LE_ADV_NCONN, ad, ARRAY_SIZE(ad),

NULL, 0);

if (err) {

printk("Advertising failed to start (err %d)\n", err);

return 0;

}

k_sleep(K_MSEC(400));

err = bt_le_adv_stop();

if (err) {

printk("Advertising failed to stop (err %d)\n", err);

return 0;

}

} while (1);

return 0;

}

RE: NRF52832 ble detection issue

Jared — Tue, 12 Dec 2023 13:01:36 GMT

Hi,

Yes but you need to change the LFCLK to use the RC oscillator instead of the external low frequency crystal. By default it will use the low frequency crystal.

You can change to RC oscillator by setting CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y in the project config in the nRF Connect SDK project,

regards

Jared

RE: NRF52832 ble detection issue

d3fine — Tue, 12 Dec 2023 12:18:30 GMT

The low-frequency crystal (ZQ2) on the board is not installed. In the datasheet for the high-frequency crystal (ZQ1), the Load Capacity is specified as 10 pF, and I couldn't find any other capacitance-related parameter. As far as I understand, BLE can operate using the internal crystal, right?

devzone.nordicsemi.com/.../6087.datasheet.pdf

Datasheet

RE: NRF52832 ble detection issue

Jared — Tue, 12 Dec 2023 11:51:51 GMT

What is the internal capacitance of your low frequency and high frequency crystals?

RE: NRF52832 ble detection issue

d3fine — Tue, 12 Dec 2023 11:05:19 GMT

devzone.nordicsemi.com/.../4747.Repeater1.pdf

devzone.nordicsemi.com/.../3757.projects.rar

Here are the source codes and the schematic.

RE: NRF52832 ble detection issue

Jared — Tue, 12 Dec 2023 10:27:39 GMT

Hi,

Assuming that you're using a custom board,

Can you share the schematics for your board? I can make the case private first if you agree to share,

[quote user=""]n my understanding, both examples should work out of the box, but unfortunately, they don't. I've uploaded the projects to the cloud. Link to the files https://drive.google.com/file/d/15gjsuDHun9xgwL13yR_y65k9e1L3tR-k/view?usp=sharing (Versions: NRF SDK 1.7.0, nrf-connect sdk 2.5.0)[/quote]

The problem doesn't have to sw related, it could be RF related. For example if the board hasn't been tuned or if you haven't followed our RF guidelines when designing the board. If you want to share files then you have to upload them here, I can't access external links. Either drag-and-drop the files or use insert->Image/video/file in the reply box,

regards

Jared