csrohit

static void gpio_setup(void)
{
    rcc_periph_clock_enable(RCC_GPIOC);
    gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
                  GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
}

csrohit

    uint32_t baud = (uint32_t)(SystemCoreClock / baudrate);

    USART1->BRR = baud;

csrohit

void led_init()
{
	RCC->APB2ENR |= RCC_APB2ENR_IOPCEN;
	GPIOC->CRH = 0x02 << ((13 - 8) << 2);
}

void led_on()
{
	GPIOC->BSRR = 1 << 13;
}

csrohit

#define MY_STACK_SIZE 512

static void thread1_handler(void *, void *, void *);
static void thread2_handler(void *, void *, void *);

K_THREAD_STACK_DEFINE(stack1, MY_STACK_SIZE);
struct k_thread thread1_data;

K_THREAD_STACK_DEFINE(stack2, MY_STACK_SIZE);
struct k_thread thread2_data;

csrohit

 // enable interrupt on button for rising edge
    ret = gpio_pin_interrupt_configure_dt(&button, GPIO_INT_EDGE_RISING);
	if (ret != 0) {
		printk("Error %d: failed to configure interrupt on %s pin %d\n",
			ret, button.port->name, button.pin);
		return;
	}

    // initialize callback structure for button interrupt
    gpio_init_callback(&button_cb, button_pressed, BIT(button.pin));

csrohit

    if (!device_is_ready(spec.port))
    {
        return;
    }

csrohit

var dbRef = firebase.database().ref();
const userRef = dbRef.child('Users');

var container = document.getElementById('container');
userRef.on("child_added", snap => {
    let user = snap.val();
    let li = document.createElement('li');
    li.innerHTML = `<i class="fa fa-user-circle" aria-hidden="true"></i>${user.name}`
    container.appendChild(li);
    li.addEventListener('click', launchChatWindow);

csrohit

var dbRef = firebase.database().ref();
const usrRef = dbRef.child('Messages/XuqOxUbSWAPIC763Sxtc6WepFfd2')
const container = document.getElementById('chat-container');
let messages  = new Object;
usrRef.on("child_added", snap => {
    //* sender is sending as well as receiving messages
    let sender = snap.val();
    // create a heading with name of the sender in it
    const div = document.createElement('div');
    // fetch information of the sender

csrohit

#include <Arduino.h>
#include <U8x8lib.h>
#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>

// Credentials

static const PROGMEM u1_t NWKSKEY[16] ={ 0xD9, 0x87, 0x45, 0xEC, 0xD6, 0x69, 0x1B, 0x2F, 0x1A, 0x32, 0x34, 0xEB, 0xFE, 0x74, 0x03, 0x91 };
static const PROGMEM u1_t APPSKEY[16] ={ 0x1E, 0x2C, 0x65, 0xCD, 0x5D, 0xE9, 0x1E, 0xE3, 0xC7, 0x3A, 0x1A, 0x6C, 0x3C, 0x10, 0xB4, 0xCA } ;