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349 lines
11 KiB
349 lines
11 KiB
/**
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* \file
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*
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* \brief USART related functionality declaration.
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*
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* Copyright (C) 2014 Atmel Corporation. All rights reserved.
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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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. The name of Atmel may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* 4. This software may only be redistributed and used in connection with an
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* Atmel microcontroller product.
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*
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* THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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_USART_ASYNC_H_INCLUDED
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#define _HAL_USART_ASYNC_H_INCLUDED
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#include "hal_io.h"
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#include <hpl_usart_async.h>
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#include <utils_ringbuffer.h>
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/**
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* \addtogroup doc_driver_hal_usart_async
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*
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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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/**
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* \brief USART descriptor
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*
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* The USART descriptor forward declaration.
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*/
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struct usart_async_descriptor;
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/**
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* \brief USART callback type
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*/
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typedef void (*usart_cb_t)(const struct usart_async_descriptor *const descr);
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/**
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* \brief USART callback types
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*/
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enum usart_async_callback_type { USART_ASYNC_RXC_CB, USART_ASYNC_TXC_CB, USART_ASYNC_ERROR_CB };
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/**
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* \brief USART callbacks
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*/
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struct usart_async_callbacks {
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usart_cb_t tx_done;
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usart_cb_t rx_done;
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usart_cb_t error;
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};
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/** \brief USART status
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* Status descriptor holds the current status of transfer.
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*/
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struct usart_async_status {
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/** Status flags */
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uint32_t flags;
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/** Number of characters transmitted */
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uint16_t txcnt;
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/** Number of characters receviced */
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uint16_t rxcnt;
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};
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/**
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* \brief Asynchronous USART descriptor structure
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*/
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struct usart_async_descriptor {
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struct io_descriptor io;
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struct _usart_async_device device;
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struct usart_async_callbacks usart_cb;
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uint32_t stat;
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struct ringbuffer rx;
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uint16_t tx_por;
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uint8_t * tx_buffer;
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uint16_t tx_buffer_length;
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};
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/** USART write busy */
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#define USART_ASYNC_STATUS_BUSY 0x0001
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/**
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* \brief Initialize USART interface
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*
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* This function initializes the given I/O descriptor to be used as USART
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* interface descriptor.
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* It checks if the given hardware is not initialized and if the given hardware
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* is permitted to be initialized.
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*
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* \param[out] descr A USART descriptor which is used to communicate via the USART
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* \param[in] hw The pointer to the hardware instance
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* \param[in] rx_buffer An RX buffer
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* \param[in] rx_buffer_length The length of the buffer above
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* \param[in] func The pointer to a set of function pointers
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*
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* \return Initialization status.
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* \retval -1 Passed parameters were invalid or the interface is already
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* initialized
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* \retval 0 The initialization is completed successfully
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*/
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int32_t usart_async_init(struct usart_async_descriptor *const descr, void *const hw, uint8_t *const rx_buffer,
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const uint16_t rx_buffer_length, void *const func);
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/**
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* \brief Deinitialize USART interface
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*
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* This function deinitializes the given I/O descriptor.
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* It checks if the given hardware is initialized and if the given hardware
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* is permitted to be deinitialized.
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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*
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* \return De-initialization status.
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*/
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int32_t usart_async_deinit(struct usart_async_descriptor *const descr);
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/**
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* \brief Enable USART interface
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*
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* Enables the USART interface
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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*
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* \return Enabling status.
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*/
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int32_t usart_async_enable(struct usart_async_descriptor *const descr);
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/**
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* \brief Disable USART interface
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*
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* Disables the USART interface
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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*
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* \return Disabling status.
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*/
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int32_t usart_async_disable(struct usart_async_descriptor *const descr);
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/**
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* \brief Retrieve I/O descriptor
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*
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* This function retrieves the I/O descriptor of the given USART descriptor.
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[out] io An I/O descriptor to retrieve
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*
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* \return The status of I/O descriptor retrieving.
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*/
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int32_t usart_async_get_io_descriptor(struct usart_async_descriptor *const descr, struct io_descriptor **io);
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/**
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* \brief Register USART callback
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] type Callback type
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* \param[in] cb A callback function
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*
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* \return The status of callback assignment.
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* \retval -1 Passed parameters were invalid or the interface is not initialized
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* \retval 0 A callback is registered successfully
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*/
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int32_t usart_async_register_callback(struct usart_async_descriptor *const descr,
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const enum usart_async_callback_type type, usart_cb_t cb);
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/**
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* \brief Specify action for flow control pins
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*
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* This function sets action (or state) for flow control pins if
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* the flow control is enabled.
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* It sets state of flow control pins only if automatic support of
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* the flow control is not supported by the hardware.
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] state A state to set the flow control pins
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*
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* \return The status of flow control action setup.
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*/
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int32_t usart_async_set_flow_control(struct usart_async_descriptor *const descr,
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const union usart_flow_control_state state);
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/**
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* \brief Set USART baud rate
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] baud_rate A baud rate to set
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*
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* \return The status of baud rate setting.
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*/
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int32_t usart_async_set_baud_rate(struct usart_async_descriptor *const descr, const uint32_t baud_rate);
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/**
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* \brief Set USART data order
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] data_order A data order to set
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*
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* \return The status of data order setting.
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*/
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int32_t usart_async_set_data_order(struct usart_async_descriptor *const descr, const enum usart_data_order data_order);
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/**
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* \brief Set USART mode
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] mode A mode to set
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*
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* \return The status of mode setting.
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*/
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int32_t usart_async_set_mode(struct usart_async_descriptor *const descr, const enum usart_mode mode);
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/**
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* \brief Set USART parity
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] parity A parity to set
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*
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* \return The status of parity setting.
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*/
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int32_t usart_async_set_parity(struct usart_async_descriptor *const descr, const enum usart_parity parity);
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/**
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* \brief Set USART stop bits
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] stop_bits Stop bits to set
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*
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* \return The status of stop bits setting.
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*/
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int32_t usart_async_set_stopbits(struct usart_async_descriptor *const descr, const enum usart_stop_bits stop_bits);
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/**
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* \brief Set USART character size
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[in] size A character size to set
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*
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* \return The status of character size setting.
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*/
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int32_t usart_async_set_character_size(struct usart_async_descriptor *const descr,
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const enum usart_character_size size);
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/**
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* \brief Retrieve the state of flow control pins
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*
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* This function retrieves the flow control pins
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* if the flow control is enabled.
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*
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* The function can return USART_FLOW_CONTROL_STATE_UNAVAILABLE in case
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* if the flow control is done by the hardware
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* and the pins state cannot be read out.
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[out] state The state of flow control pins
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*
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* \return The status of flow control state reading.
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*/
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int32_t usart_async_flow_control_status(const struct usart_async_descriptor *const descr,
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union usart_flow_control_state *const state);
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/**
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* \brief Check if the USART transmitter is empty
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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*
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* \return The status of USART TX empty checking.
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* \retval 0 The USART transmitter is not empty
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* \retval 1 The USART transmitter is empty
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*/
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int32_t usart_async_is_tx_empty(const struct usart_async_descriptor *const descr);
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/**
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* \brief Check if the USART receiver is not empty
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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*
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* \return The status of the USART RX empty checking.
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* \retval 1 The USART receiver is not empty
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* \retval 0 The USART receiver is empty
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*/
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int32_t usart_async_is_rx_not_empty(const struct usart_async_descriptor *const descr);
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/**
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* \brief Retrieve the current interface status
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*
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* \param[in] descr A USART descriptor which is used to communicate via USART
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* \param[out] status The state of USART
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*
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* \return The status of USART status retrieving.
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*/
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int32_t usart_async_get_status(struct usart_async_descriptor *const descr, struct usart_async_status *const status);
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/**
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* \brief flush USART ringbuf
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*
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* This function flush USART RX ringbuf.
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*
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* \param[in] descr The pointer to USART descriptor
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*
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* \return ERR_NONE
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*/
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int32_t usart_async_flush_rx_buffer(struct usart_async_descriptor *const descr);
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/**
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* \brief Retrieve the current driver version
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*
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* \return Current driver version.
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*/
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uint32_t usart_async_get_version(void);
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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_USART_ASYNC_H_INCLUDED */
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