nRF9160 with BME280 sensor

[AMG]

I am trying to test a BME280  sensor on the nRF9160. I followed the steps where I created a folder (board) and added the nrf9160_pca10090.overlay and add couple of line in the prj.conf. I am building with build -b nrf9160_pca10090ns(non-secure). I get an error while building. I didnt connect the sensor but the code should build without the sensor am I wrong ?

same error with segger

In file included from /home/ahmed/v1.2.0/zephyr/drivers/sensor/bme280/bme280.c:24:0:
3> /home/ahmed/v1.2.0/zephyr/drivers/sensor/bme280/bme280.h:114:2: error: #error "BME280 device type not specified"
3> /home/ahmed/v1.2.0/zephyr/drivers/sensor/bme280/bme280.c:370:22: warning: unused variable 'data' [-Wunused-variable]
3> In file included from ../../../../include/drivers/sensor.h:23:0,
3>                  from /home/ahmed/v1.2.0/zephyr/drivers/sensor/bme280/bme280.c:11:
3> /home/ahmed/v1.2.0/zephyr/drivers/sensor/bme280/bme280.c:398:29: error: 'DT_INST_0_BOSCH_BME280_LABEL' undeclared here (not in a function); did you mean 'DT_INST_0_SOC_NV_FLASH_LABEL'?
3> ../../../../include/device.h:106:11: note: in definition of macro 'DEVICE_AND_API_INIT'
4> Compiling 'nrf_cc310_platform_mutex_zephyr.c'
5> Compiling 'nrf_cc310_platform_abort_zephyr.c'
8> Compiling 'sys_clock_init.c'
Build failed

I will add the codes form the files as well to make it easier.

&i2c2 {
    status = "ok";
    sda-pin = <12>;
    scl-pin = <11>;
    
    bme280@76 {
        compatible = "bosch,bme280";
        reg = <0x76>;
        label = "BME280";
    };
};

Overlay

CONFIG_STDOUT_CONSOLE=y
CONFIG_I2C=y
CONFIG_SENSOR=y
CONFIG_BME280=y
CONFIG_I2C_2=y

prj.conf

# SPDX-License-Identifier: Apache-2.0

cmake_minimum_required(VERSION 3.13.1)
include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
project(bme280)

FILE(GLOB app_sources src/*.c)
target_sources(app PRIVATE ${app_sources})

CMake

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr.h>
#include <device.h>
#include <drivers/sensor.h>

void main(void)
{
	struct device *dev = device_get_binding("BME280");

	if (dev == NULL) {
		printk("Could not get BME280 device\n");
		return;
	}

	printk("dev %p name %s\n", dev, dev->config->name);

	while (1) {
		struct sensor_value temp, press, humidity;

		sensor_sample_fetch(dev);
		sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp);
		sensor_channel_get(dev, SENSOR_CHAN_PRESS, &press);
		sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &humidity);

		printk("temp: %d.%06d; press: %d.%06d; humidity: %d.%06d\n",
		      temp.val1, temp.val2, press.val1, press.val2,
		      humidity.val1, humidity.val2);

		k_sleep(K_MSEC(1000));
	}
}

main

[Jan Tore Guggedal]

Hi,

It looks like the issue is that your device tree overlay file name doesn't match your build target.
If you rename it to "nrf9160_pca10090ns.overlay", it should build.

Side note: You'll need to connect the sensor to make your application run paste the  "if (dev == NULL)" check.

Best regards,

Jan Tore

[AMG]

I was able to build after re-naming but after connecting and flashing the sensor doesn't show the values. My connection is as follows SCL >> p0.11 , SDA >> p0.12 , VCC with vin 3-5v , GND >> GND  , CSB >> GND , SD >> vin 

[Jan Tore Guggedal]

Hi,

From the BME280 datasheet it looks like CSB should be connected to V_DDIO when running in I2C mode. SDO should be grounded to use the default I2C, or V_DDIO if you need to use the alternative one. If you don't want to use the default address (0x76), you need to specify that in the overlay file by changing 0x76 to 0x77.

Best regards,

Jan Tore

[AMG]

even after changing the reg it's the same problem. From what I understood the SDO a weak pull-down resistor on the module pulls SDO low so 0x76 is the default address if the SDO pin is not connected.  Connect the SDO to Vcc to select 0x77 but both give the same result (error)

[Jan Tore Guggedal]

Hi,

It would be good with some more logging to better understand what's going on.
You can do that by adding these to your prj.conf:

CONFIG_SENSOR_LOG_LEVEL_DBG=y

CONFIG_CONFIG_I2C_LOG_LEVEL_DBG=y

If the app hangs for some reason, it can also be useful to add
CONFIG_LOG_IMMEDIATE=y

And by the way, did you change both occurences of 0x76 in the overlay to match your hardware configuration? Also bme280@76 needs to be changed.

Cheers
Jan Tore