Programming nrf52832 d internal temperature sensor

RE: Programming nrf52832 d internal temperature sensor

runsiv — Thu, 13 Apr 2023 05:54:35 GMT

That is good to hear. To display the data you can use our nrf Connect for Desktop Bluetooth Low Energy app, Microsoft's Bluetooth LE Explorer https://apps.microsoft.com/store/detail/bluetooth-le-explorer/9N0ZTKF1QD98?hl=nb-no&gl=no&rtc=1 or another application that supports BLE. However I would presume all of them will only give you a CLI.

If you want to power your DK with external power, please see our documentation

Regards

Runar

RE: Programming nrf52832 d internal temperature sensor

rawan — Wed, 12 Apr 2023 15:59:36 GMT

Hi,

I followed the BLE course and I am now getting temperature values:

Is it possible to display this data on a GUI, is there a guide as to how I can do it?

I have a final question, the nrf52 DK can be powered either by the USB, battery or an external source starting from voltage of 1.7 V. If I want to power it using the external source, which pins on the DK should be connected to allow the use of the external source?

Thanks Again

RE: Programming nrf52832 d internal temperature sensor

runsiv — Wed, 12 Apr 2023 07:00:32 GMT

Hi and thanks for the code

Next time, can you upload it using insert --> code? It makes it more readable then a normal copy/paste

I can't see that you are publishing your temperature data anywhere over BLE, only over UART with prink

I would recommend looking into exercise 2 in our Bluetooh Low Energy Fundamentals course . The exercise covers publishing a button press counter, this can easily be adapted to reading a temperature. In general I would recommend the course if you are new to BLE or our course covering NCS if you are new to nRF Connect SDK

Regards

Runar

RE: Programming nrf52832 d internal temperature sensor

rawan — Wed, 12 Apr 2023 05:34:11 GMT

Hi,

I tried a different computer the application works now thanks but the device does not connect it displays an error message that access to the COM is denied,

I have a question related to connecting the bluetooth on the board, I have this main code written and I am able to connect ble via the nrf connect for mobile but am not sure where can I read the temperature values.

Main:

#include <stdio.h>

#include <stddef.h>

#include <string.h>

#include <errno.h>

#include <zephyr/types.h>

#include <zephyr/kernel.h>

#include <zephyr/drivers/sensor.h>

#include <zephyr/sys/printk.h>

#include <zephyr/sys/byteorder.h>

#include <zephyr/bluetooth/bluetooth.h>

#include <zephyr/bluetooth/hci.h>

#include <zephyr/bluetooth/conn.h>

#include <zephyr/bluetooth/uuid.h>

#include <zephyr/bluetooth/gatt.h>

#include <zephyr/bluetooth/services/bas.h>

//#include "hts.h"

#ifdef __cplusplus

extern "C" {

#endif

void hts_init(void);

void hts_indicate(void);

#ifdef __cplusplus

}

#endif

//THIS IS THE hts.c

#ifdef CONFIG_TEMP_NRF5

static const struct device *temp_dev = DEVICE_DT_GET_ANY(nordic_nrf_temp);

#else

static const struct device *temp_dev;

#endif

static uint8_t simulate_htm;

static uint8_t indicating;

static struct bt_gatt_indicate_params ind_params;

static void htmc_ccc_cfg_changed(const struct bt_gatt_attr *attr,

uint16_t value)

{

simulate_htm = (value == BT_GATT_CCC_INDICATE) ? 1 : 0;

}

static void indicate_cb(struct bt_conn *conn,

struct bt_gatt_indicate_params *params, uint8_t err)

{

printk("Indication %s\n", err != 0U ? "fail" : "success");

}

static void indicate_destroy(struct bt_gatt_indicate_params *params)

{

printk("Indication complete\n");

indicating = 0U;

}

/* Health Thermometer Service Declaration */

BT_GATT_SERVICE_DEFINE(hts_svc,

BT_GATT_PRIMARY_SERVICE(BT_UUID_HTS),

BT_GATT_CHARACTERISTIC(BT_UUID_HTS_MEASUREMENT, BT_GATT_CHRC_INDICATE,

BT_GATT_PERM_NONE, NULL, NULL, NULL),

BT_GATT_CCC(htmc_ccc_cfg_changed,

BT_GATT_PERM_READ | BT_GATT_PERM_WRITE),

/* more optional Characteristics */

);

//IT ENDS HERE

void hts_init(void)

{

if (temp_dev == NULL || !device_is_ready(temp_dev)) {

printk("no temperature device; using simulated data\n");

temp_dev = NULL;

} else {

printk("temp device is %p, name is %s\n", temp_dev,

temp_dev->name);

}

static const struct bt_data ad[] = {

BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),

BT_DATA_BYTES(BT_DATA_UUID16_ALL,

BT_UUID_16_ENCODE(BT_UUID_HTS_VAL),

BT_UUID_16_ENCODE(BT_UUID_DIS_VAL),

BT_UUID_16_ENCODE(BT_UUID_BAS_VAL)),

};

static void connected(struct bt_conn *conn, uint8_t err)

{

if (err) {

printk("Connection failed (err 0x%02x)\n", err);

} else {

printk("Connected\n");

}

static void disconnected(struct bt_conn *conn, uint8_t reason)

{

printk("Disconnected (reason 0x%02x)\n", reason);

}

static struct bt_conn_cb conn_callbacks = {

.connected = connected,

.disconnected = disconnected,

};

static void bt_ready(void)

{

int err;

printk("Bluetooth initialized\n");

hts_init();

err = bt_le_adv_start(BT_LE_ADV_CONN_NAME, ad, ARRAY_SIZE(ad), NULL, 0);

if (err) {

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

return;

}

printk("Advertising successfully started\n");

}

static void auth_cancel(struct bt_conn *conn)

{

char addr[BT_ADDR_LE_STR_LEN];

bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));

printk("Pairing cancelled: %s\n", addr);

}

static struct bt_conn_auth_cb auth_cb_display = {

.cancel = auth_cancel,

};

static void bas_notify(void)

{

uint8_t battery_level = bt_bas_get_battery_level();

battery_level--;

if (!battery_level) {

battery_level = 100U;

}

bt_bas_set_battery_level(battery_level);

}

void hts_indicate(void)

{

/* Temperature measurements simulation */

struct sensor_value temp_value;

if (simulate_htm) {

static uint8_t htm[5];

static double temperature = 20U;

uint32_t mantissa;

uint8_t exponent;

int r;

if (indicating) {

return;

}

if (!temp_dev) {

temperature++;

if (temperature == 30U) {

temperature = 20U;

}

goto gatt_indicate;

}

r = sensor_sample_fetch(temp_dev);

if (r) {

printk("sensor_sample_fetch failed return: %d\n", r);

}

r = sensor_channel_get(temp_dev, SENSOR_CHAN_DIE_TEMP,

&temp_value);

if (r) {

printk("sensor_channel_get failed return: %d\n", r);

}

temperature = sensor_value_to_double(&temp_value);

gatt_indicate:

printf("temperature is %gC\n", temperature);

mantissa = (uint32_t)(temperature * 100);

exponent = (uint8_t)-2;

htm[0] = 0; /* temperature in celsius */

sys_put_le24(mantissa, (uint8_t *)&htm[1]);

htm[4] = exponent;

ind_params.attr = &hts_svc.attrs[2];

ind_params.func = indicate_cb;

ind_params.destroy = indicate_destroy;

ind_params.data = &htm;

ind_params.len = sizeof(htm);

if (bt_gatt_indicate(NULL, &ind_params) == 0) {

indicating = 1U;

}

void main(void)

{

int err;

err = bt_enable(NULL);

if (err) {

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

return;

}

bt_ready();

bt_conn_cb_register(&conn_callbacks);

bt_conn_auth_cb_register(&auth_cb_display);

/* Implement indicate. At the moment there is no suitable way

* of starting delayed work so we do it here

float ret;

while (1) {

k_sleep(K_SECONDS(1));

/* Temperature measurements simulation */

hts_indicate();

/* Battery level simulation */

bas_notify();

}

RE: Programming nrf52832 d internal temperature sensor

runsiv — Tue, 11 Apr 2023 13:03:15 GMT

Hi,

can you try the following :

uninstall the Bluetooth Low Energy from the OS 'Add and Remove Programs' and try to reinstall is and see if this resolves the issue?

make sure that the client rebooted the machine before reinstalling
If the above does not solve it can you try to manually install jLink 7.66a manually after 4.0.0 is installed

Can you upload the code with using insert --> code?

If you place a breakpoint on the line "ret = sensor_channel_get(temp_dev, SENSOR_CHAN_DIE_TEMP, &val);" do you get any values in the "ret" variable?

Regards

Runar

RE: Programming nrf52832 d internal temperature sensor

rawan — Tue, 11 Apr 2023 12:10:51 GMT

Can I install the ble app separately? outside of the nrf connect for desktop app?

Am using the nrf52832 the nrf connect sdk is v2.3.0

RE: Programming nrf52832 d internal temperature sensor

rawan — Tue, 11 Apr 2023 12:03:08 GMT

Hi,

Thanks for getting back to me.

I changed the main code (I can send it if needed) and this is what I have right now, the code builds and flashes and I get this message in the nrf terminal, I try opening the nrf connect for desktop ble it is not working, is there an alternative?

I downloaded the nrf connect for mobile as my peripheral and I can connect but where can I read the temperature values?

This is the prj.conf:

CONFIG_STDOUT_CONSOLE=y

CONFIG_PRINTK=y

CONFIG_PWM=y

CONFIG_LOG=y

CONFIG_LOG_PRINTK=y

CONFIG_LOG_MODE_IMMEDIATE=y

CONFIG_PWM_LOG_LEVEL_DBG=y

CONFIG_I2C=y

CONFIG_CBPRINTF_FP_SUPPORT=y

CONFIG_GPIO=y

CONFIG_SERIAL=y

CONFIG_SENSOR=y

CONFIG_TEMP_NRF5=y

CONFIG_BT=y

CONFIG_BT_DEBUG_LOG=y

CONFIG_BT_SMP=y

CONFIG_BT_PERIPHERAL=y

CONFIG_BT_DIS=y

CONFIG_BT_DIS_PNP=n

CONFIG_BT_BAS=y

CONFIG_BT_DEVICE_NAME="Zephyr Health Thermometer"

CONFIG_BT_DEVICE_APPEARANCE=768

CONFIG_BT_ATT_ENFORCE_FLOW=n

CONFIG_CBPRINTF_FP_SUPPORT=y

The overlay file:

&temp {

compatible = "nordic,nrf-temp";

status = "okay";

};

RE: Programming nrf52832 d internal temperature sensor

runsiv — Tue, 11 Apr 2023 06:03:48 GMT

Hi Rawan

Which version of the nRF Connect SDK are you using?

Can you post your prj.conf and your overlay files?

Regards

Runar