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/*
ChibiOS/RT - Copyright (C) 2006-2007 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 ports/ARM-LPC214x/ioports_lld.h
* @brief LPC214x FIO low level driver
* @addtogroup LPC214X_IOPORTS
* @{
*/
#ifndef _IOPORTS_LLD_H_
#define _IOPORTS_LLD_H_
#ifndef _LPC214X_H_
#include "lpc214x.h"
#endif
/*===========================================================================*/
/* I/O Ports Types and constants. */
/*===========================================================================*/
/**
* @brief Width, in bits, of an I/O port.
*/
#define IOPORTS_WIDTH 32
/**
* @brief Digital I/O port sized unsigned type.
*/
typedef uint32_t ioportmask_t;
/**
* @brief Port Identifier.
*/
typedef FIO * ioportid_t;
/*===========================================================================*/
/* I/O Ports Identifiers. */
/*===========================================================================*/
/**
* @brief FIO port 0 identifier.
*/
#define IOPORT_A FIO0Base
/**
* @brief FIO port 1 identifier.
*/
#define IOPORT_B FIO1Base
/*===========================================================================*/
/* Implementation, some of the following macros could be implemented as */
/* functions, please put them in a file named ioports_lld.c if so. */
/*===========================================================================*/
/**
* @brief FIO subsystem initialization.
* @details Enables the access through the fast registers.
*/
#define ioport_init_lld() { \
SCS = 3; \
}
/**
* @brief Writes a bits mask on a I/O port.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be written on the specified port
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define ioport_write_lld(port, bits) ((port)->FIO_PIN = (bits))
/**
* @brief Reads an I/O port.
*
* @param[in] port the port identifier
* @return the port bits
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define ioport_read_lld(port) ((port)->FIO_PIN)
/**
* @brief Sets a bits mask on a I/O port.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be ORed on the specified port
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define ioport_set_lld(port, bits) ((port)->FIO_SET = (bits))
/**
* @brief Clears a bits mask on a I/O port.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be cleared on the specified port
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define ioport_clear_lld(port, bits) ((port)->FIO_CLR = (bits))
/**
* @brief Toggles a bits mask on a I/O port.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be XORed on the specified port
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define ioport_toggle_lld(port, bits) ((port)->FIO_PIN ^= (bits))
/**
* @brief Writes a value on an I/O bus.
*
* @param[in] bus the I/O bus, pointer to a @p IOBus structure
* @param[in] bits the bits to be written on the I/O bus. Values exceeding
* the bus width are masked so most significant bits are lost.
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define ioport_writebus_lld(bus, bits) { \
(port)->FIO_MASK = (bus)->bus_mask; \
(port)->FIO_PIN = (bits) << (bus)->bus_offset; \
(port)->FIO_MASK = 0; \
}
/**
* @brief Reads a value from an I/O bus.
*
* @param[in] bus the I/O bus, pointer to a @p IOBus structure
* @return the bus bits
*
* @note This function is not meant to be invoked directly by the application
* code.
*/
#define ioport_readbus_lld(bus) \
(((bus)->bus_portid->FIO_PIN & (bus)->bus_mask) >> (bus)->bus_offset)
/**
* @brief FIO port setup.
* @details This function initializes a FIO port, note that this functionality
* is LPC214x specific and non portable.
*/
#define ioport_lpc214x_set_direction_lld(port, dir) { \
(port)->FIO_DIR = (dir); \
}
#endif /* _IOPORTS_LLD_H_ */
/** @} */
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