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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/ARMCM3-STM32F103/ioports_lld.h
* @brief STM32 GPIO low level driver
* @addtogroup STM32F103_IOPORTS
* @{
*/
#ifndef _IOPORTS_LLD_H_
#define _IOPORTS_LLD_H_
/*
* Tricks required to make the TRUE/FALSE declaration inside the library
* compatible.
*/
#ifndef __STM32F10x_MAP_H
#undef FALSE
#undef TRUE
#include "stm32f10x_map.h"
#define FALSE 0
#define TRUE (!FALSE)
#endif
/*===========================================================================*/
/* I/O Ports Types and constants. */
/*===========================================================================*/
/**
* @brief Width, in bits, of an I/O port.
*/
#define IOPORTS_WIDTH 16
/**
* @brief Digital I/O port sized unsigned type.
*/
typedef uint32_t ioportmask_t;
/**
* @brief Port Identifier.
* @details This type can be a scalar or some kind of pointer, do not make
* any assumption about it, use the provided macros when populating
* variables of this type.
*/
typedef GPIO_TypeDef * ioportid_t;
/*===========================================================================*/
/* I/O Ports Identifiers. */
/* The low level driver wraps the definitions already present in the STM32 */
/* firmware library. */
/*===========================================================================*/
/**
* @brief GPIO port A identifier.
*/
#if defined(_GPIOA) || defined(__DOXYGEN__)
#define IOPORT_A GPIOA
#endif
/**
* @brief GPIO port A identifier.
*/
#if defined(_GPIOB) || defined(__DOXYGEN__)
#define IOPORT_B GPIOB
#endif
/**
* @brief GPIO port A identifier.
*/
#if defined(_GPIOC) || defined(__DOXYGEN__)
#define IOPORT_C GPIOC
#endif
/**
* @brief GPIO port A identifier.
*/
#if defined(_GPIOD) || defined(__DOXYGEN__)
#define IOPORT_D GPIOD
#endif
/**
* @brief GPIO port A identifier.
*/
#if defined(_GPIOE) || defined(__DOXYGEN__)
#define IOPORT_E GPIOE
#endif
/*===========================================================================*/
/* Implementation, some of the following macros could be implemented as */
/* functions, please put them in a file named ioports_lld.c if so. */
/*===========================================================================*/
/**
* @brief GPIO ports subsystem initialization.
* @details Ports A-D enabled, AFIO enabled.
*/
#define ioport_init_lld() { \
RCC->APB2ENR |= RCC_APB2ENR_AFIOEN | RCC_APB2ENR_IOPAEN | \
RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | \
RCC_APB2ENR_IOPDEN; \
}
/**
* @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)->ODR = (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)->IDR)
/**
* @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)->BSRR = (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)->BRR = (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)->ODR ^= (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) { \
(bus)->bus_portid->BSRR = ((((~(bits)) << (bus)->bus_offset) & \
(bus)->bus_mask) << 16) | \
(((bits) << (bus)->bus_offset) & \
(bus)->bus_mask); \
}
/**
* @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->IDR & (bus)->bus_mask) >> (bus)->bus_offset)
/**
* @brief GPIO port setup.
* @details This function initializes a GPIO port, note that this functionality
* is STM32 specific and non portable.
*/
#define ioport_stm32_setup_lld(port, crh, crl) { \
(port)->CRH = (crh); \
(port)->CRL = (crl); \
}
#endif /* _IOPORTS_LLD_H_ */
/** @} */
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