143 lines
3.3 KiB
C
143 lines
3.3 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
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* @brief Public PWM Driver APIs
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*/
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#ifndef __PWM_H__
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#define __PWM_H__
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/**
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* @brief PWM Interface
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* @defgroup pwm_interface PWM Interface
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* @ingroup io_interfaces
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define PWM_ACCESS_BY_PIN 0
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#define PWM_ACCESS_ALL 1
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#include <errno.h>
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#include <zephyr/types.h>
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#include <stddef.h>
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#include <device.h>
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/**
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* @typedef pwm_pin_set_t
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* @brief Callback API upon setting the pin
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* See @a pwm_pin_set_cycles() for argument description
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*/
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typedef int (*pwm_pin_set_t)(struct device *dev, u32_t pwm,
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u32_t period_cycles, u32_t pulse_cycles);
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/**
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* @typedef pwm_get_cycles_per_sec_t
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* @brief Callback API upon getting cycles per second
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* See @a pwm_get_cycles_per_sec() for argument description
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*/
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typedef int (*pwm_get_cycles_per_sec_t)(struct device *dev, u32_t pwm,
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u64_t *cycles);
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/** @brief PWM driver API definition. */
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struct pwm_driver_api {
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pwm_pin_set_t pin_set;
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pwm_get_cycles_per_sec_t get_cycles_per_sec;
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};
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/**
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* @brief Set the period and pulse width for a single PWM output.
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*
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* @param dev Pointer to the device structure for the driver instance.
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* @param pwm PWM pin.
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* @param period Period (in clock cycle) set to the PWM. HW specific.
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* @param pulse Pulse width (in clock cycle) set to the PWM. HW specific.
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*
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* @retval 0 If successful.
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* @retval Negative errno code if failure.
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*/
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static inline int pwm_pin_set_cycles(struct device *dev, u32_t pwm,
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u32_t period, u32_t pulse)
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{
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struct pwm_driver_api *api;
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api = (struct pwm_driver_api *)dev->driver_api;
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return api->pin_set(dev, pwm, period, pulse);
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}
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/**
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* @brief Set the period and pulse width for a single PWM output.
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*
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* @param dev Pointer to the device structure for the driver instance.
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* @param pwm PWM pin.
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* @param period Period (in micro second) set to the PWM.
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* @param pulse Pulse width (in micro second) set to the PWM.
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*
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* @retval 0 If successful.
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* @retval Negative errno code if failure.
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*/
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static inline int pwm_pin_set_usec(struct device *dev, u32_t pwm,
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u32_t period, u32_t pulse)
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{
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struct pwm_driver_api *api;
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u64_t period_cycles, pulse_cycles, cycles_per_sec;
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api = (struct pwm_driver_api *)dev->driver_api;
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if (api->get_cycles_per_sec(dev, pwm, &cycles_per_sec) != 0) {
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return -EIO;
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}
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period_cycles = (period * cycles_per_sec) / USEC_PER_SEC;
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if (period_cycles >= ((u64_t)1 << 32)) {
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return -ENOTSUP;
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}
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pulse_cycles = (pulse * cycles_per_sec) / USEC_PER_SEC;
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if (pulse_cycles >= ((u64_t)1 << 32)) {
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return -ENOTSUP;
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}
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return api->pin_set(dev, pwm, (u32_t)period_cycles,
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(u32_t)pulse_cycles);
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}
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/**
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* @brief Get the clock rate (cycles per second) for a single PWM output.
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*
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* @param dev Pointer to the device structure for the driver instance.
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* @param pwm PWM pin.
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* @param cycles Pointer to the memory to store clock rate (cycles per sec).
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* HW specific.
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*
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* @retval 0 If successful.
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* @retval Negative errno code if failure.
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*/
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static inline int pwm_get_cycles_per_sec(struct device *dev, u32_t pwm,
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u64_t *cycles)
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{
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struct pwm_driver_api *api;
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api = (struct pwm_driver_api *)dev->driver_api;
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return api->get_cycles_per_sec(dev, pwm, cycles);
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}
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#ifdef __cplusplus
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}
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#endif
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/**
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* @}
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*/
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#endif /* __PWM_H__ */
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