159 lines
5.8 KiB
C
159 lines
5.8 KiB
C
/*
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ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file AVR/serial_lld.h
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* @brief AVR low level serial driver header.
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*
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* @addtogroup SERIAL
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* @{
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*/
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#ifndef _SERIAL_LLD_H_
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#define _SERIAL_LLD_H_
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#if HAL_USE_SERIAL || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @brief USART0 driver enable switch.
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* @details If set to @p TRUE the support for USART0 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(AVR_SERIAL_USE_USART0) || defined(__DOXYGEN__)
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#define AVR_SERIAL_USE_USART0 TRUE
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#endif
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/**
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* @brief USART1 driver enable switch.
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* @details If set to @p TRUE the support for USART1 is included.
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* @note The default is @p TRUE.
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*/
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#if !defined(AVR_SERIAL_USE_USART1) || defined(__DOXYGEN__)
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#define AVR_SERIAL_USE_USART1 TRUE
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#endif
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief AVR Serial Driver configuration structure.
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* @details An instance of this structure must be passed to @p sdStart()
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* in order to configure and start a serial driver operations.
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*/
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typedef struct {
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/**
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* @brief Initialization value for the BRR register.
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*/
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uint16_t sc_brr;
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/**
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* @brief Number of bits per character (USART_CHAR_SIZE_5 to USART_CHAR_SIZE_9).
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*/
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uint8_t sc_bits_per_char;
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} SerialConfig;
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/**
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* @brief @p SerialDriver specific data.
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*/
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#define _serial_driver_data \
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_base_asynchronous_channel_data \
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/* Driver state.*/ \
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sdstate_t state; \
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/* Input queue.*/ \
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input_queue_t iqueue; \
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/* Output queue.*/ \
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output_queue_t oqueue; \
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/* Input circular buffer.*/ \
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uint8_t ib[SERIAL_BUFFERS_SIZE]; \
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/* Output circular buffer.*/ \
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uint8_t ob[SERIAL_BUFFERS_SIZE]; \
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/* End of the mandatory fields.*/
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/**
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* @brief Macro for baud rate computation.
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* @note Make sure the final baud rate is within tolerance.
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*/
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#define UBRR(b) (((F_CPU / b) >> 4) - 1)
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/**
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* @brief Macro for baud rate computation when U2Xn == 1.
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* @note Make sure the final baud rate is within tolerance.
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*/
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#define UBRR2x(b) (((F_CPU / b) >> 3) - 1)
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/**
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* @brief Macro for baud rate computation.
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* @note Make sure the final baud rate is within tolerance.
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* @note This version uses floating point math for greater accuracy.
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*/
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#define UBRR_F(b) ((((double) F_CPU / (double) b) / 16.0) - 0.5)
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/**
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* @brief Macro for baud rate computation when U2Xn == 1.
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* @note Make sure the final baud rate is within tolerance.
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* @note This version uses floating point math for greater accuracy.
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*/
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#define UBRR2x_F(b) ((((double) F_CPU / (double) b) / 8.0) - 0.5)
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#define USART_CHAR_SIZE_5 0
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#define USART_CHAR_SIZE_6 1
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#define USART_CHAR_SIZE_7 2
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#define USART_CHAR_SIZE_8 3
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#define USART_CHAR_SIZE_9 4
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if AVR_SERIAL_USE_USART0 && !defined(__DOXYGEN__)
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extern SerialDriver SD1;
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#endif
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#if AVR_SERIAL_USE_USART1 && !defined(__DOXYGEN__)
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extern SerialDriver SD2;
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void sd_lld_init(void);
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void sd_lld_start(SerialDriver *sdp, const SerialConfig *config);
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void sd_lld_stop(SerialDriver *sdp);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_SERIAL */
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#endif /* _SERIAL_LLD_H_ */
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/** @} */
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