e547533435
Convert code to use u{8,16,32,64}_t and s{8,16,32,64}_t instead of C99
integer types.
Jira: ZEP-2051
Change-Id: I08c682bfc0b80dfa88de859e90a011bcd2db2762
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
84 lines
1.6 KiB
C
84 lines
1.6 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 <misc/printk.h>
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#include <device.h>
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#include <pwm.h>
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#if defined(CONFIG_SOC_STM32F401XE) || defined(CONFIG_SOC_STM32L476XX)
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#define PWM_DRIVER CONFIG_PWM_STM32_2_DEV_NAME
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#define PWM_CHANNEL 1
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#elif CONFIG_SOC_STM32F103XB
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#define PWM_DRIVER CONFIG_PWM_STM32_1_DEV_NAME
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#define PWM_CHANNEL 1
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#elif defined(CONFIG_SOC_QUARK_SE_C1000) || defined(CONFIG_SOC_QUARK_D2000)
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#define PWM_DRIVER CONFIG_PWM_QMSI_DEV_NAME
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#define PWM_CHANNEL 0
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#elif defined(CONFIG_SOC_FAMILY_NRF5)
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#include <board.h>
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#define PWM_DRIVER CONFIG_PWM_NRF5_SW_0_DEV_NAME
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#define PWM_CHANNEL LED0_GPIO_PIN
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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 / 50)
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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 = 0;
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u8_t dir = 0;
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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)) {
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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 = 0;
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pulse_width = 0;
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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 = 1;
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pulse_width = PERIOD;
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}
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}
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k_sleep(MSEC_PER_SEC);
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}
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}
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