ecf3bdb5b3
Run the int_literal_to_timeout Coccinelle script to fix places where it is clear that an integer duration is being passed where a timeout value is required. Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation
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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.
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*
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* This app uses PWM[0].
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*/
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#include <zephyr.h>
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#include <sys/printk.h>
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#include <device.h>
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#include <drivers/pwm.h>
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#if defined(DT_ALIAS_PWM_LED0_PWMS_CONTROLLER) && defined(DT_ALIAS_PWM_LED0_PWMS_CHANNEL)
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/* get the defines from dt (based on alias 'pwm-led0') */
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#define PWM_DRIVER DT_ALIAS_PWM_LED0_PWMS_CONTROLLER
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#define PWM_CHANNEL DT_ALIAS_PWM_LED0_PWMS_CHANNEL
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#ifdef DT_ALIAS_PWM_LED0_PWMS_FLAGS
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#define PWM_FLAGS DT_ALIAS_PWM_LED0_PWMS_FLAGS
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#else
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#define PWM_FLAGS 0
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#endif
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#else
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#error "Choose supported PWM driver"
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#endif
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/*
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* 50 is flicker fusion threshold. Modulated light will be perceived
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* as steady by our eyes when blinking rate is at least 50.
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*/
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#define PERIOD (USEC_PER_SEC / 50U)
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/* in micro second */
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#define FADESTEP 2000
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void main(void)
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{
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struct device *pwm_dev;
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u32_t pulse_width = 0U;
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u8_t dir = 0U;
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printk("PWM demo app-fade LED\n");
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pwm_dev = device_get_binding(PWM_DRIVER);
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if (!pwm_dev) {
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printk("Cannot find %s!\n", PWM_DRIVER);
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return;
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}
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while (1) {
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if (pwm_pin_set_usec(pwm_dev, PWM_CHANNEL,
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PERIOD, pulse_width, PWM_FLAGS)) {
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printk("pwm pin set fails\n");
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return;
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}
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if (dir) {
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if (pulse_width < FADESTEP) {
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dir = 0U;
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pulse_width = 0U;
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} else {
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pulse_width -= FADESTEP;
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}
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} else {
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pulse_width += FADESTEP;
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if (pulse_width >= PERIOD) {
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dir = 1U;
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pulse_width = PERIOD;
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}
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}
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k_sleep(K_SECONDS(1));
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}
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}
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