I am keep trying to get the BME680 example to work with the nRF52840-DK using Zephyr.
I check and successfully find the node for the BME680, but "device_get_binding()" for the BME680 device returns NULL
What do I need to do to get the BME680 to work with the nRF52840-DK via I2C?
I get the following output via the serial monitor.
Hello! I'm running Zephyr 2.3.0 on nrf52840dk_nrf52840, a arm board.
No device "BME680" found; did initialization fail?
Following is are my files.
nrf52840dk_nrf52840.overlay
&i2c0 {
bme680@77 {
compatible = "bosch,bme680";
reg = <0x77>;
label = "BME680";
};
};
prj.conf
CONFIG_PRINTK=y CONFIG_STDOUT_CONSOLE=y CONFIG_PWM=y CONFIG_LOG=y CONFIG_PWM_LOG_LEVEL_DBG=y CONFIG_I2C=y CONFIG_BME680=y
main.c
#include <zephyr.h>
#include <device.h>
#include <devicetree.h>
#include <drivers/gpio.h>
#include <sys/printk.h>
#include <sys/util.h>
#include <version.h>
#include <stdio.h>
#include <drivers/sensor.h>
// The devicetree node identifier for the "led0" alias.
#define LED0_NODE DT_ALIAS(led0)
#if DT_NODE_HAS_STATUS(LED0_NODE, okay)
#define LED0 DT_GPIO_LABEL(LED0_NODE, gpios)
#define PIN DT_GPIO_PIN(LED0_NODE, gpios)
#if DT_PHA_HAS_CELL(LED0_NODE, gpios, flags)
#define FLAGS DT_GPIO_FLAGS(LED0_NODE, gpios)
#endif
#else
// A build error here means your board isn't set up to blink an LED.
#error "Unsupported board: led0 devicetree alias is not defined"
#define LED0 ""
#define PIN 0
#endif
#ifndef FLAGS
#define FLAGS 0
#endif
#define BME680 DT_INST(0, bosch_bme680)
#if DT_NODE_HAS_STATUS(BME680, okay)
#define BME680_LABEL DT_LABEL(BME680)
#else
#error "Your device tree has no enabled nodes with compatible "bosch,bme680""
#define BME680_LABEL "<none>"
#endif
void startDelayAndVersion(void)
{
/// Sleep for 1 second to make sure all messages get output to the serial monitor.
k_sleep(K_SECONDS(1));
printk("Hello! I'm running Zephyr %s on %s, a %s board.\n\n ", KERNEL_VERSION_STRING, CONFIG_BOARD, CONFIG_ARCH);
};
void main(void)
{
startDelayAndVersion();
struct device *blueLedDevice;
bool led_is_on = true;
int returnValue = 0;
blueLedDevice = device_get_binding(LED0);
if (blueLedDevice == NULL) {
return;
}
returnValue = gpio_pin_configure(blueLedDevice, PIN, GPIO_OUTPUT_ACTIVE | FLAGS);
if (returnValue < 0) {
return;
}
struct device *bme680Device = device_get_binding(BME680_LABEL);
struct sensor_value temp, press, humidity, gas_res;
if (bme680Device == NULL) {
printk("No device \"%s\" found; did initialization fail?\n", BME680_LABEL);
return;
} else {
printk("Found device \"%s\"\n", BME680_LABEL);
}
printf("Device %p name is %s\n", bme680Device, bme680Device->name);
while (1) {
/// Blink blue LED.
gpio_pin_set(blueLedDevice, PIN, (int)led_is_on);
led_is_on = !led_is_on;
k_sleep(K_MSEC(3000));
sensor_sample_fetch(bme680Device);
sensor_channel_get(bme680Device, SENSOR_CHAN_AMBIENT_TEMP, &temp);
sensor_channel_get(bme680Device, SENSOR_CHAN_PRESS, &press);
sensor_channel_get(bme680Device, SENSOR_CHAN_HUMIDITY, &humidity);
sensor_channel_get(bme680Device, SENSOR_CHAN_GAS_RES, &gas_res);
printf("T: %d.%06d; P: %d.%06d; H: %d.%06d; G: %d.%06d\n",
temp.val1, temp.val2, press.val1, press.val2,
humidity.val1, humidity.val2, gas_res.val1,
gas_res.val2);
}
}
