1 /*
2 * Copyright (c) 2023 TOKITA Hiroshi
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/kernel.h>
8 #include <zephyr/device.h>
9 #include <zephyr/drivers/sensor.h>
10 #include <zephyr/sys/printk.h>
11
12 #define DIE_TEMP_ALIAS(i) DT_ALIAS(_CONCAT(die_temp, i))
13 #define DIE_TEMPERATURE_SENSOR(i, _) \
14 IF_ENABLED(DT_NODE_EXISTS(DIE_TEMP_ALIAS(i)), (DEVICE_DT_GET(DIE_TEMP_ALIAS(i)),))
15
16 /* support up to 16 cpu die temperature sensors */
17 static const struct device *const sensors[] = {LISTIFY(16, DIE_TEMPERATURE_SENSOR, ())};
18
print_die_temperature(const struct device * dev)19 static int print_die_temperature(const struct device *dev)
20 {
21 struct sensor_value val;
22 int rc;
23
24 /* fetch sensor samples */
25 rc = sensor_sample_fetch(dev);
26 if (rc) {
27 printk("Failed to fetch sample (%d)\n", rc);
28 return rc;
29 }
30
31 rc = sensor_channel_get(dev, SENSOR_CHAN_DIE_TEMP, &val);
32 if (rc) {
33 printk("Failed to get data (%d)\n", rc);
34 return rc;
35 }
36
37 printk("CPU Die temperature[%s]: %.1f °C\n", dev->name, sensor_value_to_double(&val));
38 return 0;
39 }
40
main(void)41 int main(void)
42 {
43 int rc;
44
45 for (size_t i = 0; i < ARRAY_SIZE(sensors); i++) {
46 if (!device_is_ready(sensors[i])) {
47 printk("sensor: device %s not ready.\n", sensors[i]->name);
48 return 0;
49 }
50 }
51
52 while (1) {
53 for (size_t i = 0; i < ARRAY_SIZE(sensors); i++) {
54 rc = print_die_temperature(sensors[i]);
55 if (rc < 0) {
56 return 0;
57 }
58 }
59 k_msleep(300);
60 }
61 return 0;
62 }
63
