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/**
* Copyright (c) 2016 - 2020 Nordic Semiconductor ASA and Luxoft Global Operations Gmbh.
*
* All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form, except as embedded into a Nordic
* Semiconductor ASA integrated circuit in a product or a software update for
* such product, must reproduce the above copyright notice, this list of
* conditions and the following disclaimer in the documentation and/or other
* materials provided with the distribution.
*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
* Nordic Semiconductor ASA integrated circuit.
*
* 5. Any software provided in binary form under this license must not be reverse
* engineered, decompiled, modified and/or disassembled.
*
*
* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef HAL_UART_H_INCLUDED
#define HAL_UART_H_INCLUDED
#include <stdint.h>
#include <stdlib.h>
#include <limits.h>
/** @file
* This file contains declarations of the routines, types and macros to implement the UART protocol.
*
* @defgroup hal_uart HAL UART protocol
* @ingroup hal_15_4
* @{
* @brief Module to declare HAL UART protocol
* @details The UART module implements the standard UART driver API. This includes open/close via hal_uart_open(),
* hal_uart_close(), read/write via hal_uart_read(), hal_uart_write() routines, and hal_uart_puts() for
* sending a null-terminated string in a non-blocking way. The user also can get some info about the available
* bytes for read/write via hal_uart_read_buffer_size_get() and hal_uart_write_buffer_size_get(). This implies
* that the user may register read/write buffers to use for buffered input/output and handler routines that
* will be called upon read/written characters. Also the most popular settings of the UART driver are supported:
* different baudrates, parity checks, flow control, character size, and stop bits.
*/
/** @brief Maximum size in bytes of input and output buffers. */
#define MAX_QUEUE_LENGTH 0xffffu
/** @brief Maximum size in bytes of data can be stored in hardware unit output buffer. */
#define MAX_TX_CHUNK_SIZE UCHAR_MAX
/** @brief UART baudrate. */
typedef enum
{
HAL_UART_BAUDRATE_38400, /**< 38400 bits per second.*/
HAL_UART_BAUDRATE_115200, /**< 115200 bits per second.*/
HAL_UART_BAUDRATE_230400 /**< 230400 bits per second.*/
} hal_uart_baudrate_t;
/** @brief UART parity check. */
typedef enum
{
HAL_UART_PARITY_NONE, /**< Do not check parity.*/
HAL_UART_PARITY_EVEN /**< Check even parity.*/
} hal_uart_parity_t;
/** @brief UART flow control. */
typedef enum
{
HAL_UART_FLOW_CONTROL_DISABLED, /**< Flow control is disabled.*/
HAL_UART_FLOW_CONTROL_ENABLED, /**< Flow control is enabled.*/
} hal_uart_flow_control_t;
/** @brief UART character size settings. */
typedef enum
{
HAL_UART_FIVE_BITS_CHAR = 5, /**< 5 bits character.*/
HAL_UART_SIX_BITS_CHAR, /**< 6 bits character.*/
HAL_UART_SEVEN_BITS_CHAR, /**< 7 bits character.*/
HAL_UART_EIGHT_BITS_CHAR, /**< 8 bits character.*/
} hal_uart_char_size_t;
/** @brief UART stop bits settings. */
typedef enum
{
HAL_UART_ONE_STOP_BIT, /**< 1 stop bit.*/
HAL_UART_ONEHALF_STOP_BITS, /**< 1.5 stop bits.*/
HAL_UART_TWO_STOP_BITS, /**< 2 stop bits.*/
} hal_uart_stop_bits_t;
/** @brief Represents error source for the UART driver. There might be other values,
* representing clearer elaborating of error statuses, if this module is used
* with Windows or Linux.
*/
typedef enum
{
HAL_UART_ERROR_NONE = 0, /**< Success.*/
HAL_UART_ERROR_TX_OVERFLOW = 252, /**< This error happens when amount of elements in
the transmitter ring buffer exceeds its size.
All the data above limit is not placed into
buffer.*/
HAL_UART_ERROR_RX_OVERFLOW = 253, /**< This error happens when amount of elements in
the receiver ring buffer exceeds its size.
All the unread data is overwritten with new
received data.*/
HAL_UART_ERROR_RX_UNDERFLOW = 254, /**< This error happens when the user-side software
tries to read more elements than it is available
in the receive buffer.
The user-side buffer will be filled with all available
characters and then the error handler is started.*/
HAL_UART_ERROR_HW_ERROR = 255, /**< There is some unrecoverable error in hardware.*/
} hal_uart_error_t;
/**
* @brief User-side handler of UART read and write events.
*
* @param[in] channel event channel number.
* @param[in] char_count number of characters successfully sent before entering
* the callback function.
*/
typedef void (*hal_uart_handler_t)(uint32_t channel, size_t char_count);
/**
* @brief User-side handler for UART error events.
*
* @param[in] channel event channel number.
* @param[in] error_id call reason.
*/
typedef void (*hal_uart_error_handler_t)(uint32_t channel, hal_uart_error_t error_id);
/** @brief HAL UART configuration structure.
*/
typedef struct
{
uint32_t module; /**< UART module number. By now zero
is the only option.*/
uint32_t tx_pin; /**< Number of pin used as TX.*/
uint32_t rx_pin; /**< Number of pin used as RX.*/
uint32_t cts_pin; /**< Number of pin used as CTS.*/
uint32_t rts_pin; /**< Number of pin used as RTS.*/
hal_uart_baudrate_t baudrate; /**< Baudrate selector.*/
hal_uart_parity_t parity; /**< Parity selector.*/
hal_uart_flow_control_t flow_control; /**< Flow control selector.*/
hal_uart_char_size_t char_size; /**< Size of char in bits.*/
hal_uart_stop_bits_t stop_bits; /**< Stop bits number.*/
} hal_uart_config_t;
/**
* @brief This structure defines the UART module operation.
*
* If \a write_buffer_ptr is defined as NULL, then sending data will work
* in blocking way, that is call for \a hal_uart_write will be completed
* only after sending of the last byte passed as input parameter.
*
* If \a read_buffer_ptr is defined as NULL, then driver will drop every
* received byte.
*/
typedef struct
{
hal_uart_config_t uart_config; /**< UART settings struct.*/
hal_uart_handler_t write_handler; /**< Callback function for write operation.*/
void * write_buffer_ptr; /**< User-side buffer for write operation.*/
size_t write_buffer_size; /**< Size of write operation buffer.*/
hal_uart_handler_t read_handler; /**< Callback function for read operation.*/
void * read_buffer_ptr; /**< User-side buffer for read operation.*/
size_t read_buffer_size; /**< Size of read operation buffer.*/
hal_uart_error_handler_t error_handler; /**< Callback function in case of something
goes wrong.*/
} hal_uart_descriptor_t;
/**
* @brief Configures UART interface using input parameter.
*
* @param[in] config pointer to a config struct.
* @param[in] descriptor pointer to a descriptor struct.
*
* @return Return status of operation.
*/
hal_uart_error_t hal_uart_open(const hal_uart_config_t * config,
const hal_uart_descriptor_t * descriptor);
/**
* @brief Sends data in a non-blocking way.
*
* @param[in] descriptor pointer to the UART module operation structure.
* @param[in] data pointer to the user-side buffer of output data.
* @param[in] length number of bytes to transmit.
*
* If descriptor has a non-null \a write_buffer_ptr then this function will use it
* as a temporary buffer and will copy input \a data to it before starting
* transmit. If descriptor has the NULL \a write_buffer_ptr, then the user-side code
* is responsible to retain \a data until \a write_handler is called.
*/
void hal_uart_write(const hal_uart_descriptor_t * descriptor,
const uint8_t * data,
const size_t length);
/**
* @brief Sends a null-terminated C-string in a non-blocking way.
*
* @param[in] descriptor pointer to the UART module operation structure.
* @param[in] s null-terminated string to send.
*/
void hal_uart_puts(const hal_uart_descriptor_t * descriptor, const char * s);
/**
* @brief Receives data in a non-blocking way.
*
* @param[in] descriptor pointer to the UART module operation structure.
* @param[out] data pointer to the user-side buffer used to receive data.
* @param[in] length number of bytes to receive.
*
* If descriptor has a non-null \a read_buffer_ptr, then this function is used to
* copy input characters from it to \a data.
* If \a read_buffer_ptr is NULL, then this function ignores all inputs.
*/
void hal_uart_read(const hal_uart_descriptor_t * descriptor,
uint8_t * data,
const size_t length);
/**
* @brief Returns number of bytes available to read from the income buffer of the
* driver.
*
* @param[in] descriptor pointer to driver structure.
*
* @return Number of bytes available to read.
*/
size_t hal_uart_read_buffer_size_get(const hal_uart_descriptor_t * descriptor);
/**
* @brief Returns number of bytes available to write to the outgoing buffer of the
* driver.
*
* @param[in] descriptor pointer to driver structure.
*
* @return Number of bytes available to write.
*/
size_t hal_uart_write_buffer_size_get(const hal_uart_descriptor_t * descriptor);
/**
* @brief This function deallocates resources previously allocated by hal_uart_open.
*
* @param[in] descriptor pointer to driver structure.
*
* @return Return status of operation.
*/
hal_uart_error_t hal_uart_close(const hal_uart_descriptor_t * descriptor);
#if defined(CONFIG_TRACE) && defined(CONFIG_DEBUG)
/**
* @brief Finalizes remaining trace data output to UART.
*
* @details This debugging feature is needed to finalize buffered trace output
* to UART before commencing non-buffered assertion output.
*/
void hal_uart_trace_finalize(void);
#endif
/** @} */
#endif /* HAL_UART_H_INCLUDED */