8c8de70f6e
Add support for nRF boards by using the software-based PWM driver. The prescaler has to be configured so that the clock runs slower in order to make the on-board LED blink in the way it is described in the Readme. Signed-off-by: Johannes Hutter <johannes@proglove.de>
89 lines
1.8 KiB
C
89 lines
1.8 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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#include <board.h>
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#if defined(CONFIG_SOC_STM32F401XE) || defined(CONFIG_SOC_STM32F412ZG) || \
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defined(CONFIG_SOC_STM32F413XH) || defined(CONFIG_SOC_STM32L476XG) || \
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defined(CONFIG_SOC_STM32F407XG)
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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_NRF)
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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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#elif defined(CONFIG_BOARD_HEXIWEAR_K64)
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#define PWM_DRIVER GREEN_PWM_NAME
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#define PWM_CHANNEL GREEN_PWM_CHANNEL
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#elif defined(CONFIG_BOARD_COLIBRI_IMX7D_M4)
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#define PWM_DRIVER PWM_1_LABEL
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#define PWM_CHANNEL 0
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#else
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#error "Choose supported PWM driver"
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#endif
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/* in micro second */
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#define MIN_PERIOD (USEC_PER_SEC / 64)
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/* in micro second */
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#define MAX_PERIOD USEC_PER_SEC
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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 period = MAX_PERIOD;
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u8_t dir = 0;
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printk("PWM demo app-blink 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, period / 2)) {
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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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period *= 2;
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if (period > MAX_PERIOD) {
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dir = 0;
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period = MAX_PERIOD;
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}
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} else {
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period /= 2;
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if (period < MIN_PERIOD) {
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dir = 1;
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period = MIN_PERIOD;
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}
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}
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k_sleep(MSEC_PER_SEC * 4);
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}
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}
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