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 */ }