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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file AVR/serial_lld.h
* @brief AVR low level serial driver header.
*
* @addtogroup SERIAL
* @{
*/
#ifndef _SERIAL_LLD_H_
#define _SERIAL_LLD_H_
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief USART0 driver enable switch.
* @details If set to @p TRUE the support for USART0 is included.
* @note The default is @p FALSE.
*/
#if !defined(USE_AVR_USART0) || defined(__DOXYGEN__)
#define USE_AVR_USART0 TRUE
#endif
/**
* @brief USART1 driver enable switch.
* @details If set to @p TRUE the support for USART1 is included.
* @note The default is @p TRUE.
*/
#if !defined(USE_AVR_USART1) || defined(__DOXYGEN__)
#define USE_AVR_USART1 TRUE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief AVR Serial Driver configuration structure.
* @details An instance of this structure must be passed to @p sdStart()
* in order to configure and start a serial driver operations.
*/
typedef struct {
/**
* @brief Initialization value for the BRR register.
*/
uint16_t sc_brr;
/**
* @brief Number of bits per character (USART_CHAR_SIZE_5 to USART_CHAR_SIZE_9).
*/
uint8_t sc_bits_per_char;
} SerialConfig;
/**
* @brief @p SerialDriver specific data.
*/
#define _serial_driver_data \
_base_asynchronous_channel_data \
/* Driver state.*/ \
sdstate_t state; \
/* Input queue.*/ \
InputQueue iqueue; \
/* Output queue.*/ \
OutputQueue oqueue; \
/* Input circular buffer.*/ \
uint8_t ib[SERIAL_BUFFERS_SIZE]; \
/* Output circular buffer.*/ \
uint8_t ob[SERIAL_BUFFERS_SIZE]; \
/* End of the mandatory fields.*/
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @brief Macro for baud rate computation.
* @note Make sure the final baud rate is within tolerance.
*/
#define UBRR(b) (((F_CPU / b) >> 4) - 1)
/**
* @brief Macro for baud rate computation when U2Xn == 1.
* @note Make sure the final baud rate is within tolerance.
*/
#define UBRR2x(b) (((F_CPU / b) >> 3) - 1)
/**
* @brief Macro for baud rate computation.
* @note Make sure the final baud rate is within tolerance.
* @note This version uses floating point math for greater accuracy.
*/
#define UBRR_F(b) ((((double) F_CPU / (double) b) / 16.0) - 0.5)
/**
* @brief Macro for baud rate computation when U2Xn == 1.
* @note Make sure the final baud rate is within tolerance.
* @note This version uses floating point math for greater accuracy.
*/
#define UBRR2x_F(b) ((((double) F_CPU / (double) b) / 8.0) - 0.5)
#define USART_CHAR_SIZE_5 0
#define USART_CHAR_SIZE_6 1
#define USART_CHAR_SIZE_7 2
#define USART_CHAR_SIZE_8 3
#define USART_CHAR_SIZE_9 4
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if USE_AVR_USART0 && !defined(__DOXYGEN__)
extern SerialDriver SD1;
#endif
#if USE_AVR_USART1 && !defined(__DOXYGEN__)
extern SerialDriver SD2;
#endif
#ifdef __cplusplus
extern "C" {
#endif
void sd_lld_init(void);
void sd_lld_start(SerialDriver *sdp, const SerialConfig *config);
void sd_lld_stop(SerialDriver *sdp);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_SERIAL */
#endif /* _SERIAL_LLD_H_ */
/** @} */
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