79e6b0e0f6
As of today <zephyr/zephyr.h> is 100% equivalent to <zephyr/kernel.h>. This patch proposes to then include <zephyr/kernel.h> instead of <zephyr/zephyr.h> since it is more clear that you are including the Kernel APIs and (probably) nothing else. <zephyr/zephyr.h> sounds like a catch-all header that may be confusing. Most applications need to include a bunch of other things to compile, e.g. driver headers or subsystem headers like BT, logging, etc. The idea of a catch-all header in Zephyr is probably not feasible anyway. Reason is that Zephyr is not a library, like it could be for example `libpython`. Zephyr provides many utilities nowadays: a kernel, drivers, subsystems, etc and things will likely grow. A catch-all header would be massive, difficult to keep up-to-date. It is also likely that an application will only build a small subset. Note that subsystem-level headers may use a catch-all approach to make things easier, though. NOTE: This patch is **NOT** removing the header, just removing its usage in-tree. I'd advocate for its deprecation (add a #warning on it), but I understand many people will have concerns. Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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* Copyright (c) 2020 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file Sample app to demonstrate PWM-based LED fade
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/sys/printk.h>
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#include <zephyr/device.h>
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#include <zephyr/drivers/pwm.h>
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static const struct pwm_dt_spec pwm_led0 = PWM_DT_SPEC_GET(DT_ALIAS(pwm_led0));
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#define NUM_STEPS 50U
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#define SLEEP_MSEC 25U
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void main(void)
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{
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uint32_t pulse_width = 0U;
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uint32_t step = pwm_led0.period / NUM_STEPS;
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uint8_t dir = 1U;
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int ret;
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printk("PWM-based LED fade\n");
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if (!device_is_ready(pwm_led0.dev)) {
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printk("Error: PWM device %s is not ready\n",
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pwm_led0.dev->name);
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return;
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}
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while (1) {
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ret = pwm_set_pulse_dt(&pwm_led0, pulse_width);
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if (ret) {
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printk("Error %d: failed to set pulse width\n", ret);
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return;
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}
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if (dir) {
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pulse_width += step;
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if (pulse_width >= pwm_led0.period) {
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pulse_width = pwm_led0.period - step;
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dir = 0U;
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}
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} else {
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if (pulse_width >= step) {
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pulse_width -= step;
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} else {
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pulse_width = step;
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dir = 1U;
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}
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}
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k_sleep(K_MSEC(SLEEP_MSEC));
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}
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}
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