/* Copyright (c) 2002, 2003, 2004, 2007 Marek Michalkiewicz Copyright (c) 2005, 2006 Bjoern Haase Copyright (c) 2008 Atmel Corporation Copyright (c) 2008 Wouter van Gulik All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* $Id: eeprom.h,v 1.21.2.4 2008/04/09 11:01:28 dmix Exp $ */ #ifndef _AVR_EEPROM_H_ #define _AVR_EEPROM_H_ 1 #include #include /* size_t */ #include #ifdef __cplusplus extern "C" { #endif #ifndef __ATTR_PURE__ # ifdef __DOXYGEN__ # define __ATTR_PURE__ # else # define __ATTR_PURE__ __attribute__((__pure__)) # endif #endif uint16_t __eerd_word (const uint16_t *, uint8_t (*)(const uint8_t *)) __ATTR_PURE__; uint32_t __eerd_dword (const uint32_t *, uint8_t (*)(const uint8_t *)) __ATTR_PURE__; void __eerd_block (void *, const void *, size_t, uint8_t (*)(const uint8_t *)); void __eewr_word (uint16_t *, uint16_t, void (*)(uint8_t *, uint8_t)); void __eewr_dword (uint32_t *, uint32_t, void (*)(uint8_t *, uint8_t)); void __eewr_block (void *, const void *, size_t, void (*)(uint8_t *, uint8_t)); #if !E2END && !defined(__DOXYGEN__) # ifndef __COMPILING_AVR_LIBC__ # warning "Device does not have EEPROM available." # endif /* Omit below for chips without EEPROM. */ #else /** \defgroup avr_eeprom : EEPROM handling \code #include \endcode This header file declares the interface to some simple library routines suitable for handling the data EEPROM contained in the AVR microcontrollers. The implementation uses a simple polled mode interface. Applications that require interrupt-controlled EEPROM access to ensure that no time will be wasted in spinloops will have to deploy their own implementation. \note All of the read/write functions first make sure the EEPROM is ready to be accessed. Since this may cause long delays if a write operation is still pending, time-critical applications should first poll the EEPROM e. g. using eeprom_is_ready() before attempting any actual I/O. But this functions are not wait until SELFPRGEN in SPMCSR becomes zero. Do this manually, if your softwate contains the Flash burning. \note As these functions modify IO registers, they are known to be non-reentrant. If any of these functions are used from both, standard and interrupt context, the applications must ensure proper protection (e.g. by disabling interrupts before accessing them). \note All write functions force erase_and_write programming mode. */ /** \def EEMEM \ingroup avr_eeprom Attribute expression causing a variable to be allocated within the .eeprom section. */ #define EEMEM __attribute__((section(".eeprom"))) /* Register definitions */ /* Check for aliases. */ #if !defined(EEWE) && defined(EEPE) # define EEWE EEPE #endif #if !defined(EEMWE) && defined(EEMPE) # define EEMWE EEMPE #endif #if !defined(EECR) && defined(DEECR) /* AT86RF401 */ # define EECR DEECR # define EEAR DEEAR # define EEARL DEEAR # define EEDR DEEDR # define EERE EER # define EEWE EEL # define EEMWE EEU #endif #if !defined(EECR) || !defined(EEDR) || !defined(EEARL) # if !defined(__EEPROM_REG_LOCATIONS__) \ && !defined(EEPROM_REG_LOCATIONS_OVERRIDE) /* 6-byte string denoting where to find the EEPROM registers in memory space. Adresses denoted in hex syntax with uppercase letters. Used by the EEPROM subroutines. First two letters: EECR address. Second two letters: EEDR address. Last two letters: EEAR address. */ # error "Unknown EEPROM register(s) location." # endif /* If needed, override the locations defined in the IO headers. */ # ifdef EEPROM_REG_LOCATIONS_OVERRIDE # undef __EEPROM_REG_LOCATIONS__ # define __EEPROM_REG_LOCATIONS__ EEPROM_REG_LOCATIONS_OVERRIDE # endif # define CONCAT1(a, b) CONCAT2(a, b) # define CONCAT2(a, b) a ## b # define HEXNR CONCAT1(0x, __EEPROM_REG_LOCATIONS__) # undef EECR # define EECR _SFR_IO8((HEXNR >> 16) & 0xFF) # undef EEDR # define EEDR _SFR_IO8((HEXNR >> 8) & 0xFF) # undef EEAR # define EEAR _SFR_IO8(HEXNR & 0xFF) # undef EEARH # undef EEARL # define EEARL EEAR #endif /** \def eeprom_is_ready \ingroup avr_eeprom \returns 1 if EEPROM is ready for a new read/write operation, 0 if not. */ #if defined(__DOXYGEN__) # define eeprom_is_ready() #elif defined(DEECR) # define eeprom_is_ready() bit_is_clear(DEECR, BSY) #else # define eeprom_is_ready() bit_is_clear(EECR, EEWE) #endif /** \def eeprom_busy_wait \ingroup avr_eeprom Loops until the eeprom is no longer busy. \returns Nothing. */ #define eeprom_busy_wait() do {} while (!eeprom_is_ready()) /** \ingroup avr_eeprom Read one byte from EEPROM address \a __p. */ __ATTR_PURE__ static __inline__ uint8_t eeprom_read_byte (const uint8_t *__p) { do {} while (!eeprom_is_ready ()); #if E2END <= 0xFF EEARL = (uint8_t)__p; #else EEAR = (uint16_t)__p; #endif uint8_t __result; __asm__ __volatile__ ( "/* START EEPROM READ CRITICAL SECTION */ \n\t" "sbi %1, %2 \n\t" "in %0, %3 \n\t" "/* END EEPROM READ CRITICAL SECTION */ \n\t" : "=r" (__result) : "i" (_SFR_IO_REG_P(EECR) ? _SFR_IO_ADDR(EECR) : _SFR_MEM_ADDR(EECR)), "i" (EERE), "i" (_SFR_IO_REG_P(EEDR) ? _SFR_IO_ADDR(EEDR) : _SFR_MEM_ADDR(EEDR)) ); return __result; } /** \ingroup avr_eeprom Read one 16-bit word (little endian) from EEPROM address \a __p. */ __ATTR_PURE__ static __inline__ uint16_t eeprom_read_word (const uint16_t *__p) { return __eerd_word (__p, eeprom_read_byte); } /** \ingroup avr_eeprom Read one 32-bit double word (little endian) from EEPROM address \a __p. */ __ATTR_PURE__ static __inline__ uint32_t eeprom_read_dword (const uint32_t *__p) { return __eerd_dword (__p, eeprom_read_byte); } /** \ingroup avr_eeprom Read a block of \a __n bytes from EEPROM address \a __src to SRAM \a __dst. */ static __inline__ void eeprom_read_block (void *__dst, const void *__src, size_t __n) { __eerd_block (__dst, __src, __n, eeprom_read_byte); } /** \ingroup avr_eeprom Write a byte \a __value to EEPROM address \a __p. */ static __inline__ void eeprom_write_byte (uint8_t *__p, uint8_t __value) { do {} while (!eeprom_is_ready ()); #if defined(EEPM0) && defined(EEPM1) EECR = 0; /* Set programming mode: erase and write. */ #elif defined(EEPM0) || defined(EEPM1) # warning "Unknown EECR register, eeprom_write_byte() has become outdated." #endif #if E2END <= 0xFF EEARL = (unsigned)__p; #else EEAR = (unsigned)__p; #endif EEDR = __value; __asm__ __volatile__ ( "/* START EEPROM WRITE CRITICAL SECTION */\n\t" "in r0, %[__sreg] \n\t" "cli \n\t" "sbi %[__eecr], %[__eemwe] \n\t" "sbi %[__eecr], %[__eewe] \n\t" "out %[__sreg], r0 \n\t" "/* END EEPROM WRITE CRITICAL SECTION */" : : [__eecr] "i" (_SFR_IO_ADDR(EECR)), [__sreg] "i" (_SFR_IO_ADDR(SREG)), [__eemwe] "i" (EEMWE), [__eewe] "i" (EEWE) : "r0" ); } /** \ingroup avr_eeprom Write a word \a __value to EEPROM address \a __p. */ static __inline__ void eeprom_write_word (uint16_t *__p, uint16_t __value) { __eewr_word (__p, __value, eeprom_write_byte); } /** \ingroup avr_eeprom Write a 32-bit double word \a __value to EEPROM address \a __p. */ static __inline__ void eeprom_write_dword (uint32_t *__p, uint32_t __value) { __eewr_dword (__p, __value, eeprom_write_byte); } /** \ingroup avr_eeprom Write a block of \a __n bytes to EEPROM address \a __dst from \a __src. \note The argument order is mismatch with common functions like strcpy(). */ static __inline__ void eeprom_write_block (const void *__src, void *__dst, size_t __n) { __eewr_block (__dst, __src, __n, eeprom_write_byte); } /** \name IAR C compatibility defines */ /*@{*/ /** \def _EEPUT \ingroup avr_eeprom Write a byte to EEPROM. Compatibility define for IAR C. */ #define _EEPUT(addr, val) eeprom_write_byte ((uint8_t *)(addr), (uint8_t)(val)) /** \def _EEGET \ingroup avr_eeprom Read a byte from EEPROM. Compatibility define for IAR C. */ #define _EEGET(var, addr) (var) = eeprom_read_byte ((const uint8_t *)(addr)) /*@}*/ #endif /* E2END || defined(__DOXYGEN__) */ #ifdef __cplusplus } #endif #endif /* !_AVR_EEPROM_H */