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111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/**
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* \file
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*
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* \brief I/O related functionality declaration.
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*
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* Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.
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*
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* \asf_license_start
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*
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* \page License
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*
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* Subject to your compliance with these terms, you may use Microchip
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* software and any derivatives exclusively with Microchip products.
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* It is your responsibility to comply with third party license terms applicable
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* to your use of third party software (including open source software) that
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* may accompany Microchip software.
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*
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* THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
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* WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
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* INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
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* AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
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* LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
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* LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
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* SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
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* POSSIBILITY OR THE DAMAGES ARE FORESEEABLE. TO THE FULLEST EXTENT
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* ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
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* RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
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* THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
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*
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* \asf_license_stop
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*
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*/
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#ifndef _HAL_IO_INCLUDED
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#define _HAL_IO_INCLUDED
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/**
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* \addtogroup doc_driver_hal_helper_io I/O Driver
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*
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*@{
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*/
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#include <compiler.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief I/O descriptor
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*
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* The I/O descriptor forward declaration.
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*/
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struct io_descriptor;
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/**
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* \brief I/O write function pointer type
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*/
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typedef int32_t (*io_write_t)(struct io_descriptor *const io_descr, const uint8_t *const buf, const uint16_t length);
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/**
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* \brief I/O read function pointer type
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*/
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typedef int32_t (*io_read_t)(struct io_descriptor *const io_descr, uint8_t *const buf, const uint16_t length);
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/**
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* \brief I/O descriptor
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*/
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struct io_descriptor {
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io_write_t write; /*! The write function pointer. */
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io_read_t read; /*! The read function pointer. */
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};
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/**
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* \brief I/O write interface
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*
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* This function writes up to \p length of bytes to a given I/O descriptor.
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* It returns the number of bytes actually write.
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*
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* \param[in] descr An I/O descriptor to write
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* \param[in] buf The buffer pointer to story the write data
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* \param[in] length The number of bytes to write
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*
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* \return The number of bytes written
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*/
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int32_t io_write(struct io_descriptor *const io_descr, const uint8_t *const buf, const uint16_t length);
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/**
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* \brief I/O read interface
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*
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* This function reads up to \p length bytes from a given I/O descriptor, and
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* stores it in the buffer pointed to by \p buf. It returns the number of bytes
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* actually read.
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*
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* \param[in] descr An I/O descriptor to read
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* \param[in] buf The buffer pointer to story the read data
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* \param[in] length The number of bytes to read
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*
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* \return The number of bytes actually read. This number can be less than the
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* requested length. E.g., in a driver that uses ring buffer for
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* reception, it may depend on the availability of data in the
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* ring buffer.
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*/
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int32_t io_read(struct io_descriptor *const io_descr, uint8_t *const buf, const uint16_t length);
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#ifdef __cplusplus
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}
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#endif
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/**@}*/
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#endif /* _HAL_IO_INCLUDED */
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