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Added Doxygen documentation
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adamdunkels
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@ -1,39 +1,42 @@
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science
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* All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: xmem.c,v 1.2 2006/08/10 16:42:11 bg- Exp $
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* @(#)$Id: xmem.c,v 1.3 2007/11/10 20:45:29 adamdunkels Exp $
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*/
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/*
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* Device driver for the ST M25P80 40MHz 1Mbyte external memory.
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/**
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* \file
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* Device driver for the ST M25P80 40MHz 1Mbyte external memory.
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* \author
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* Björn Grönvall <bg@sics.se>
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*
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* Data is written bit inverted (~-operator) to flash so that
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* unwritten data will read as zeros (UNIX style).
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* Data is written bit inverted (~-operator) to flash so that
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* unwritten data will read as zeros (UNIX style).
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*/
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#include <stdio.h>
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@ -64,13 +67,13 @@
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#define SPI_FLASH_INS_BE 0xc7
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#define SPI_FLASH_INS_DP 0xb9
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#define SPI_FLASH_INS_RES 0xab
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/*---------------------------------------------------------------------------*/
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static void
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spi_tx(unsigned byte)
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{
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FASTSPI_TX(byte);
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}
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/*---------------------------------------------------------------------------*/
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static void
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write_enable(void)
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{
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@ -84,7 +87,7 @@ write_enable(void)
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SPI_FLASH_DISABLE();
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splx(s);
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}
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/*---------------------------------------------------------------------------*/
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static unsigned
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read_status_register(void)
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{
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@ -105,7 +108,7 @@ read_status_register(void)
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return u;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Wait for a write/erase operation to finish.
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*/
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@ -118,7 +121,7 @@ wait_ready(void)
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} while(u & 0x01); /* WIP=1, write in progress */
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return u;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Erase 64k bytes of data. It takes about 1s before WIP goes low!
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*/
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@ -142,7 +145,7 @@ erase_sector(off_t offset)
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SPI_FLASH_DISABLE();
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splx(s);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Initialize external flash *and* SPI bus!
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*/
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@ -157,7 +160,7 @@ xmem_init(void)
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SPI_FLASH_DISABLE(); /* Unselect flash. */
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SPI_FLASH_UNHOLD();
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}
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/*---------------------------------------------------------------------------*/
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int
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xmem_pread(void *_p, int size, off_t offset)
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{
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@ -186,7 +189,7 @@ xmem_pread(void *_p, int size, off_t offset)
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splx(s);
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return size;
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}
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/*---------------------------------------------------------------------------*/
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static const char *
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program_page(off_t offset, const unsigned char *p, int nbytes)
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{
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@ -214,7 +217,7 @@ program_page(off_t offset, const unsigned char *p, int nbytes)
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return p;
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}
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/*---------------------------------------------------------------------------*/
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int
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xmem_pwrite(const void *_buf, int size, off_t addr)
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{
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@ -231,7 +234,7 @@ xmem_pwrite(const void *_buf, int size, off_t addr)
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}
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return size;
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}
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/*---------------------------------------------------------------------------*/
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int
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xmem_erase(long size, off_t addr)
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{
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@ -252,3 +255,4 @@ xmem_erase(long size, off_t addr)
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return size;
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}
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/*---------------------------------------------------------------------------*/
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