1 /*
2 * Copyright (c) 2012-2014 Wind River Systems, Inc.
3 * Copyright (c) 2021 Nordic Semiconductor ASA
4 *
5 * SPDX-License-Identifier: Apache-2.0
6 */
7
8 #include <zephyr/kernel.h>
9 #include <zephyr/device.h>
10 #include <zephyr/devicetree.h>
11 #include <zephyr/drivers/sensor.h>
12 #include <zephyr/drivers/sensor_data_types.h>
13 #include <zephyr/rtio/rtio.h>
14 #include <zephyr/dsp/print_format.h>
15
16 /*
17 * Get a device structure from a devicetree node with compatible
18 * "bosch,bme280". (If there are multiple, just pick one.)
19 */
20 const struct device *const dev = DEVICE_DT_GET_ANY(bosch_bme280);
21
22 SENSOR_DT_READ_IODEV(iodev, DT_COMPAT_GET_ANY_STATUS_OKAY(bosch_bme280),
23 {SENSOR_CHAN_AMBIENT_TEMP, 0},
24 {SENSOR_CHAN_HUMIDITY, 0},
25 {SENSOR_CHAN_PRESS, 0});
26
27 RTIO_DEFINE(ctx, 1, 1);
28
check_bme280_device(void)29 static const struct device *check_bme280_device(void)
30 {
31 if (dev == NULL) {
32 /* No such node, or the node does not have status "okay". */
33 printk("\nError: no device found.\n");
34 return NULL;
35 }
36
37 if (!device_is_ready(dev)) {
38 printk("\nError: Device \"%s\" is not ready; "
39 "check the driver initialization logs for errors.\n",
40 dev->name);
41 return NULL;
42 }
43
44 printk("Found device \"%s\", getting sensor data\n", dev->name);
45 return dev;
46 }
47
main(void)48 int main(void)
49 {
50 const struct device *dev = check_bme280_device();
51
52 if (dev == NULL) {
53 return 0;
54 }
55
56 while (1) {
57 uint8_t buf[128];
58
59 int rc = sensor_read(&iodev, &ctx, buf, 128);
60
61 if (rc != 0) {
62 printk("%s: sensor_read() failed: %d\n", dev->name, rc);
63 return rc;
64 }
65
66 const struct sensor_decoder_api *decoder;
67
68 rc = sensor_get_decoder(dev, &decoder);
69
70 if (rc != 0) {
71 printk("%s: sensor_get_decode() failed: %d\n", dev->name, rc);
72 return rc;
73 }
74
75 uint32_t temp_fit = 0;
76 struct sensor_q31_data temp_data = {0};
77
78 decoder->decode(buf,
79 (struct sensor_chan_spec) {SENSOR_CHAN_AMBIENT_TEMP, 0},
80 &temp_fit, 1, &temp_data);
81
82 uint32_t press_fit = 0;
83 struct sensor_q31_data press_data = {0};
84
85 decoder->decode(buf,
86 (struct sensor_chan_spec) {SENSOR_CHAN_PRESS, 0},
87 &press_fit, 1, &press_data);
88
89 uint32_t hum_fit = 0;
90 struct sensor_q31_data hum_data = {0};
91
92 decoder->decode(buf,
93 (struct sensor_chan_spec) {SENSOR_CHAN_HUMIDITY, 0},
94 &hum_fit, 1, &hum_data);
95
96 printk("temp: %s%d.%d; press: %s%d.%d; humidity: %s%d.%d\n",
97 PRIq_arg(temp_data.readings[0].temperature, 6, temp_data.shift),
98 PRIq_arg(press_data.readings[0].pressure, 6, press_data.shift),
99 PRIq_arg(hum_data.readings[0].humidity, 6, hum_data.shift));
100
101 k_sleep(K_MSEC(1000));
102 }
103 return 0;
104 }
105
