0b90fd5adf
As both C and C++ standards require applications running under an OS to
return 'int', adapt that for Zephyr to align with those standard. This also
eliminates errors when building with clang when not using -ffreestanding,
and reduces the need for compiler flags to silence warnings for both clang
and gcc.
Most of these changes were automated using coccinelle with the following
script:
@@
@@
- void
+ int
main(...) {
...
- return;
+ return 0;
...
}
Approximately 40 files had to be edited by hand as coccinelle was unable to
fix them.
Signed-off-by: Keith Packard <keithp@keithp.com>
76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
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* Copyright (c) 2017 Linaro Limited
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/sensor.h>
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#include <stdio.h>
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#include <zephyr/sys/util.h>
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static void process_sample(const struct device *dev)
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{
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static unsigned int obs;
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struct sensor_value temp, hum;
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if (sensor_sample_fetch(dev) < 0) {
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printf("Sensor sample update error\n");
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return;
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}
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if (sensor_channel_get(dev, SENSOR_CHAN_AMBIENT_TEMP, &temp) < 0) {
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printf("Cannot read HTS221 temperature channel\n");
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return;
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}
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if (sensor_channel_get(dev, SENSOR_CHAN_HUMIDITY, &hum) < 0) {
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printf("Cannot read HTS221 humidity channel\n");
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return;
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}
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++obs;
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printf("Observation:%u\n", obs);
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/* display temperature */
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printf("Temperature:%.1f C\n", sensor_value_to_double(&temp));
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/* display humidity */
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printf("Relative Humidity:%.1f%%\n",
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sensor_value_to_double(&hum));
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}
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static void hts221_handler(const struct device *dev,
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const struct sensor_trigger *trig)
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{
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process_sample(dev);
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}
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int main(void)
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{
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const struct device *const dev = DEVICE_DT_GET_ONE(st_hts221);
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if (!device_is_ready(dev)) {
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printk("sensor: device not ready.\n");
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return 0;
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}
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if (IS_ENABLED(CONFIG_HTS221_TRIGGER)) {
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struct sensor_trigger trig = {
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.type = SENSOR_TRIG_DATA_READY,
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.chan = SENSOR_CHAN_ALL,
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};
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if (sensor_trigger_set(dev, &trig, hts221_handler) < 0) {
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printf("Cannot configure trigger\n");
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return 0;
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}
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}
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while (!IS_ENABLED(CONFIG_HTS221_TRIGGER)) {
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process_sample(dev);
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k_sleep(K_MSEC(2000));
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}
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k_sleep(K_FOREVER);
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return 0;
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}
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