EDIT: I thought I had enabled RTT terminal output in this proejct, which I had not. Obviously this will have an impact on my problems sorrounding RTT terminal output. So I'm currently adding RTT terminal output and will revisit this thread.
Hi,
I will try to explain my problems as best as I can. It is somewhat intermittent but occuring more often than not. Also I'm a newcomer to Nordic NRF SDK so my understanding is not helping much out either.
My hardware setup is a custom board using NRF52810 connected via SWD header P20 on a NRF52832 DK. The custom board is self powered using a CR2032 coin cell. I experience the same issues using the DK MCU directly.
Software setup is NRF Connect SDK version 2.6.1 on VS Code. My code is a modified example of the lis2dh12 sample code with some added GPIO (sensor readout not working at the moemnt, will probably post about this when my setup is behaving).
Problem(s):
When I flash my board, it seems that sometimes it doesn't reset. I have to re-insert the coin cell. For the DK I could simply push the reset button "IF BOOT/RESET". Using the DK MCU, sometimes I could simply wait for a "slow boot" and it would eventually boot without me intervening.
When the board resets (which I can see from that LEDs starts blinking) I don't always get any RTT terminal output. Usually I don't. I have some printf's and log output which occur during boot when things act normal (from my perspective):
SEGGER J-Link V7.96l - Real time terminal output
SEGGER J-Link (unknown) V1.0, SN=682410030
Process: JLink.exe
Could not get LIS2DH device
[00:00:00.912,170] <err> lis2dh: Failed to read chip id.
*** Booting nRF Connect SDK 3758bcbfa5cd ***
This is the output when nothing is printed:
SEGGER J-Link V7.96l - Real time terminal output
SEGGER J-Link (unknown) V1.0, SN=682410030
Process: JLink.exe
I have no idea which part of the project/code might be contributing to this behavior so I'm not including source files other than main.c at this moment.
main.c
/*
* Copyright (c) 2019 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/sys/util.h>
#include <inttypes.h>
#define LED0_NODE DT_NODELABEL(led_b)
#define ADDR_NODE DT_NODELABEL(lis2dh12_addr)
#define CS_NODE DT_NODELABEL(lis2dh12_cs)
static void fetch_and_display(const struct device *sensor)
{
static unsigned int count;
struct sensor_value accel[3];
struct sensor_value temperature;
const char *overrun = "";
int rc = sensor_sample_fetch(sensor);
++count;
if (rc == -EBADMSG) {
/* Sample overrun. Ignore in polled mode. */
if (IS_ENABLED(CONFIG_LIS2DH_TRIGGER)) {
overrun = "[OVERRUN] ";
}
rc = 0;
}
if (rc == 0) {
rc = sensor_channel_get(sensor,
SENSOR_CHAN_ACCEL_XYZ,
accel);
}
if (rc < 0) {
printf("ERROR: Update failed: %d\n", rc);
} else {
printf("#%u @ %u ms: %sx %f , y %f , z %f",
count, k_uptime_get_32(), overrun,
sensor_value_to_double(&accel[0]),
sensor_value_to_double(&accel[1]),
sensor_value_to_double(&accel[2]));
}
if (IS_ENABLED(CONFIG_LIS2DH_MEASURE_TEMPERATURE)) {
if (rc == 0) {
rc = sensor_channel_get(sensor, SENSOR_CHAN_DIE_TEMP, &temperature);
if (rc < 0) {
printf("\nERROR: Unable to read temperature:%d\n", rc);
} else {
printf(", t %f\n", sensor_value_to_double(&temperature));
}
}
} else {
printf("\n");
}
}
#ifdef CONFIG_LIS2DH_TRIGGER
static void trigger_handler(const struct device *dev,
const struct sensor_trigger *trig)
{
fetch_and_display(dev);
}
#endif
int main(void)
{
int ret;
static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
static const struct gpio_dt_spec addr = GPIO_DT_SPEC_GET(ADDR_NODE, gpios);
static const struct gpio_dt_spec cs = GPIO_DT_SPEC_GET(CS_NODE, gpios);
const struct device *const sensor = DEVICE_DT_GET_ANY(st_lis2dh);
if (!gpio_is_ready_dt(&led)) {
return 0;
}
ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
if (ret < 0) {
return 0;
}
printf("Kommer hit\n");
gpio_pin_set_dt(&cs, 1); //Puts LIS2DH12 CS high, means I2C mode.
gpio_pin_set_dt(&addr, 1); //Sets address pin high, means address = 0x19 (probably)
k_sleep(K_MSEC(2000));
gpio_pin_set_dt(&led, 1); //Turn on blue LED
if (sensor == NULL) {
printf("No device found\n");
return 0;
}
if (!device_is_ready(sensor)) {
printf("Device %s is not ready\n", sensor->name);
return 0;
}
#if CONFIG_LIS2DH_TRIGGER
{
struct sensor_trigger trig;
int rc;
trig.type = SENSOR_TRIG_DATA_READY;
trig.chan = SENSOR_CHAN_ACCEL_XYZ;
if (IS_ENABLED(CONFIG_LIS2DH_ODR_RUNTIME)) {
struct sensor_value odr = {
.val1 = 1,
};
rc = sensor_attr_set(sensor, trig.chan,
SENSOR_ATTR_SAMPLING_FREQUENCY,
&odr);
if (rc != 0) {
printf("Failed to set odr: %d\n", rc);
return 0;
}
printf("Sampling at %u Hz\n", odr.val1);
}
rc = sensor_trigger_set(sensor, &trig, trigger_handler);
if (rc != 0) {
printf("Failed to set trigger: %d\n", rc);
return 0;
}
printf("Waiting for triggers\n");
while (true) {
k_sleep(K_MSEC(2000));
}
}
#else /* CONFIG_LIS2DH_TRIGGER */
printf("Polling at 0.5 Hz\n");
while (true) {
fetch_and_display(sensor);
k_sleep(K_MSEC(2000));
}
#endif /* CONFIG_LIS2DH_TRIGGER */
}
