/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011 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 . */ /** * @file AVR/pal_lld.h * @brief AVR GPIO low level driver header. * * @addtogroup PAL * @{ */ #ifndef _PAL_LLD_H_ #define _PAL_LLD_H_ #if HAL_USE_PAL || defined(__DOXYGEN__) /*===========================================================================*/ /* Unsupported modes and specific modes */ /*===========================================================================*/ #undef PAL_MODE_INPUT_PULLDOWN #undef PAL_MODE_OUTPUT_OPENDRAIN /*===========================================================================*/ /* I/O Ports Types and constants. */ /*===========================================================================*/ /** * @brief Width, in bits, of an I/O port. */ #define PAL_IOPORTS_WIDTH 8 /** * @brief Whole port mask. * @brief This macro specifies all the valid bits into a port. */ #define PAL_WHOLE_PORT ((ioportmask_t)0xFF) /** * @brief AVR setup registers. */ typedef struct { uint8_t out; uint8_t dir; } avr_gpio_setup_t; typedef struct { volatile uint8_t in; volatile uint8_t dir; volatile uint8_t out; } avr_gpio_registers_t; /** * @brief Generic I/O ports static initializer. * @details An instance of this structure must be passed to @p palInit() at * system startup time in order to initialized the digital I/O * subsystem. This represents only the initial setup, specific pads * or whole ports can be reprogrammed at later time. */ typedef struct { #if defined(PORTA) || defined(__DOXYGEN__) avr_gpio_setup_t porta; #endif #if defined(PORTB) || defined(__DOXYGEN__) avr_gpio_setup_t portb; #endif #if defined(PORTC) || defined(__DOXYGEN__) avr_gpio_setup_t portc; #endif #if defined(PORTD) || defined(__DOXYGEN__) avr_gpio_setup_t portd; #endif #if defined(PORTE) || defined(__DOXYGEN__) avr_gpio_setup_t porte; #endif } PALConfig; /** * @brief Digital I/O port sized unsigned type. */ typedef uint8_t ioportmask_t; /** * @brief Digital I/O modes. */ typedef uint8_t iomode_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 avr_gpio_registers_t *ioportid_t; /*===========================================================================*/ /* I/O Ports Identifiers. */ /*===========================================================================*/ #if defined(PORTA) || defined(__DOXYGEN__) /** * @brief GPIO port A identifier. */ #define IOPORT1 ((volatile avr_gpio_registers_t *)&PINA) #endif #if defined(PORTB) || defined(__DOXYGEN__) /** * @brief GPIO port B identifier. */ #define IOPORT2 ((volatile avr_gpio_registers_t *)&PINB) #endif #if defined(PORTC) || defined(__DOXYGEN__) /** * @brief GPIO port C identifier. */ #define IOPORT3 ((volatile avr_gpio_registers_t *)&PINC) #endif #if defined(PORTD) || defined(__DOXYGEN__) /** * @brief GPIO port D identifier. */ #define IOPORT4 ((volatile avr_gpio_registers_t *)&PIND) #endif #if defined(PORTE) || defined(__DOXYGEN__) /** * @brief GPIO port E identifier. */ #define IOPORT5 ((volatile avr_gpio_registers_t *)&PINE) #endif /*===========================================================================*/ /* Implementation, some of the following macros could be implemented as */ /* functions, if so please put them in pal_lld.c. */ /*===========================================================================*/ /** * @brief Low level PAL subsystem initialization. * * @param[in] config the architecture-dependent ports configuration * * @notapi */ #define pal_lld_init(config) _pal_lld_init(config) /** * @brief Reads the physical I/O port states. * * @param[in] port the port identifier * @return The port bits. * * @notapi */ #define pal_lld_readport(port) ((port)->in) /** * @brief Reads the output latch. * @details The purpose of this function is to read back the latched output * value. * * @param[in] port the port identifier * @return The latched logical states. * * @notapi */ #define pal_lld_readlatch(port) ((port)->out) /** * @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 * * @notapi */ #define pal_lld_writeport(port, bits) ((port)->out = bits) /** * @brief Pads group mode setup. * @details This function programs a pads group belonging to the same port * with the specified mode. * @note Programming an unknown or unsupported mode is silently ignored. * * @param[in] port the port identifier * @param[in] mask the group mask * @param[in] mode the mode * * @notapi */ #define pal_lld_setgroupmode(port, mask, mode) _pal_lld_setgroupmode(port, mask, mode) /** * @brief Sets a pad logical state to @p PAL_HIGH. * * @param[in] port the port identifier * @param[in] pad the pad number within the port * * @notapi */ #define pal_lld_setpad(port, pad) \ __asm__ __volatile__ \ ( \ "sbi %0,%1\n\t" \ : \ : "I" (_SFR_IO_ADDR(port->out)), \ "I" (pad) \ \ ) /** * @brief Clears a pad logical state to @p PAL_LOW. * * @param[in] port the port identifier * @param[in] pad the pad number within the port * * @notapi */ #define pal_lld_clearpad(port, pad) \ __asm__ __volatile__ \ ( \ "cbi %0,%1\n\t" \ : \ : "I" (_SFR_IO_ADDR(port->out)), \ "I" (pad) \ \ ) extern ROMCONST PALConfig pal_default_config; #ifdef __cplusplus extern "C" { #endif void _pal_lld_init(const PALConfig *config); void _pal_lld_setgroupmode(ioportid_t port, ioportmask_t mask, iomode_t mode); #ifdef __cplusplus } #endif #endif /* HAL_USE_PAL */ #endif /* _PAL_LLD_H_ */ /** @} */