how to start a "hello world' and connect the board to my mobilephone

[Cong Ma]

I turn on the device, the led turns green. And I use usb to connect it with computer then I  open the nrf connect for desktop, the bluetooth low energy tool,

10:51:05.822

Received status with code 0 PKT_SEND_MAX_RETRIES_REACHED, message: 'No response from device. Tried to send packet 6 times.'

10:51:07.010

serial port COM3 closed.

10:51:07.015

Error occured when opening port. Errorcode: NRF_ERROR_TIMEOUT (0xd)

then this error happened, and I cant find the device on my phone.

How can I start a hello world with my phone?

[Vidar Berg]

Hello,

Which board to use with nRF connect. You can find the list of supported boards here: nRF Connect Bluetooth Low Energy

Best regards,

Vidar

[Cong Ma]

I use the nrf5340dk, when I open the BLE app,It came out like this, does it look like a J-LINK problem?

Many thanks

Cong

[Vidar Berg]

OK thanks. Did you build sample for 'nrf5340dk_nrf5340_cpuapp'?

[Cong Ma]

yes

[Cong Ma]

Now I have switched to another 5340 board for the BLINKY test and the results are still the same, I think there is something wrong with the SAMPLE code or it does not apply to the 5340

Cong

[Vidar Berg]

Please try to build and program the blinky sample in /ncs/zephyr/samples/basic/blinky. Alternatively, send me the project you are using now so I can try it here.

[Cong Ma]

this is the project I am using, I'll try your way.

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

#include <zephyr.h>
#include <drivers/gpio.h>

/* 1000 msec = 1 sec */
#define SLEEP_TIME_MS   1000

/* The devicetree node identifier for the "led0" alias. */
#define LED0_NODE DT_ALIAS(led0)

/*
 * A build error on this line means your board is unsupported.
 * See the sample documentation for information on how to fix this.
 */
static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);

void main(void)
{
	const struct device *dev;
	bool led_is_on = true;
	int ret;

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

	ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
	if (ret < 0) {
		return;
	}

	while (1) {
		ret = gpio_pin_toggle_dt(&led);
		if (ret < 0) {
			return;
		}
		k_msleep(SLEEP_TIME_MS);
	}
}