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>
63 lines
1.2 KiB
C
63 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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int 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 0;
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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 0;
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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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return 0;
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}
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