+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2007 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Function library for AT45DB081D Flash memory.
+ *
+ *
+ * \version $Id: dflash.c 15379 2007-03-28 15:46:09Z asterix $
+ * \author Daniele Basile <asterix@develer.com>
+ */
+
+
+#include <appconfig.h>
+
+#include <avr/io.h>
+#include <cfg/macros.h>
+#include <cfg/debug.h>
+#include <cfg/module.h>
+#include <drv/timer.h>
+#include <drv/spi.h>
+#include <drv/dflash.h>
+
+#include "hw_spi.h"
+
+/**
+ * Send a generic command to data flash memory.
+ * This function send only 4 byte, for opcode, page address and
+ * byte address.
+ */
+static void send_cmd(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode)
+{
+
+ /*
+ * Make sure to toggle CS signal in order,
+ * and reset dflash command decoder.
+ *
+ * Note:
+ * #define CS_TOGGLE() \
+ * CS_DISABLE(); \
+ * CS_ENABLE(); \
+ */
+ CS_TOGGLE();
+
+
+ /*
+ * To send one command to data flash memory, we send 4 byte.
+ * First byte is opcode command, second and third byte are
+ * page address, in last byte we write a byte page address.
+ * (see datasheet for more detail).
+ *
+ * \note Generaly a defaul memory page size is more than 256 byte.
+ * In this case we need for addressing a byte in one page more than
+ * 8 bit, so we put in fourth byte low part of address byte, and
+ * hight part of address byte in third byte togheter low par of page
+ * address.
+ *
+ * \{
+ */
+
+ /*
+ * Send opcode.
+ */
+ spi_sendRecv(opcode);
+
+ /*
+ * Send page address.
+ * \{
+ */
+ spi_sendRecv((uint8_t)(page_addr >> (16 - DFLASH_PAGE_ADDRESS_BIT)));
+ spi_sendRecv((uint8_t)((page_addr << (DFLASH_PAGE_ADDRESS_BIT - 8)) + (byte_addr >> 8)));
+ /*\}*/
+
+ /*
+ * Send byte page address.
+ */
+ spi_sendRecv((uint8_t)byte_addr);
+
+ /* \} */
+
+}
+
+/**
+ * Reset dataflash memory function.
+ *
+ * This function reset data flash memory
+ * with one pulse reset long about 10usec.
+ *
+ */
+static void dflash_reset(void)
+{
+ CS_ENABLE();
+ RESET_ENABLE();
+ timer_delayHp(us_to_hptime(RESET_PULSE_WIDTH));
+ CS_DISABLE();
+ RESET_DISABLE();
+ timer_delayHp(us_to_hptime(RESET_PULSE_WIDTH));
+}
+
+/**
+ * dflash init function.
+ * This function initialize a micro pin and
+ * SPI driver, and test if data flash memory
+ * density is the same wich define in dflash.h.
+ */
+MOD_DEFINE(dflash);
+static bool dflash_pin_init(void)
+{
+ uint8_t stat;
+
+ MOD_CHECK(spi);
+
+ RESET_DISABLE();
+ WRITE_ENABLE(); //pilot wp pin.
+
+ RESET_OUT();
+ WP_OUT();
+
+ dflash_reset();
+
+ stat = dflash_stat();
+
+ MOD_INIT(dflash);
+
+ /*
+ * 2,3,4,5 bit of 1 byte status register
+ * indicate a device density of dflash memory
+ * (see datasheet for more detail.)
+ */
+ GET_ID_DESITY_DEVICE(stat);
+
+ if(stat == DFLASH_ID_DEVICE_DENSITY)
+ return true;
+ else
+ return false;
+
+}
+
+
+/**
+ * Read status register of dataflah memory.
+ *
+ */
+static uint8_t dflash_stat(void)
+{
+ uint8_t stat;
+
+ /*
+ * Make sure to toggle CS signal in order,
+ * and reset dflash command decoder.
+ * \{
+ */
+ CS_TOGGLE();
+
+ stat = spi_sendRecv(DFO_READ_STATUS);
+ stat = spi_sendRecv(0x00);
+
+ return stat;
+}
+
+
+/**
+ * Send one command to data flash memory, and
+ * return status register value.
+ *
+ */
+static uint8_t dflash_cmd(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode)
+{
+
+ send_cmd(page_addr, byte_addr, opcode);
+
+ CS_DISABLE();
+ CS_ENABLE();
+
+ /*
+ * We chech data flash memory state, and wait until busy-flag
+ * is hight.
+ */
+ while(!(dflash_stat() & BUSY_BIT));
+
+ return (dflash_stat());
+
+}
+
+/**
+ * Read one byte from main data flash memory or buffer data
+ * flash memory.
+ */
+static uint8_t dflash_read_byte(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode)
+{
+ uint8_t data;
+
+ send_cmd(page_addr, byte_addr, opcode);
+
+#if CONFIG_DATA_FLASH == AT45DB041B
+ if(opcode == DFO_READ_FLASH_MEM_BYTE)
+ {
+ /*
+ * Send 24 don't care bit.
+ * \{
+ */
+ spi_sendRecv(0x00);
+ spi_sendRecv(0x00);
+ spi_sendRecv(0x00);
+ /* \} */
+
+ }
+#endif
+
+ spi_sendRecv(0x00); //Send 8 don't care bit.
+ data = spi_sendRecv(0x00); //Read byte.
+ CS_DISABLE();
+
+ return data;
+}
+
+/**
+ * Read \a len bytes from main data flash memory or buffer data
+ * flash memory, and put it in \a *block.
+ */
+static void dflash_read_block(dflashAddr_t page_addr, dflashAddr_t byte_addr, DFlashOpcode opcode, uint8_t *block, dflashSize_t len)
+{
+
+ send_cmd(page_addr, byte_addr, opcode);
+
+ if(opcode == DFO_READ_FLASH_MEM_BYTE)
+ {
+ /*
+ * Send 24 don't care bit.
+ * \{
+ */
+ spi_sendRecv(0x00);
+ spi_sendRecv(0x00);
+ spi_sendRecv(0x00);
+ /* \} */
+ }
+
+ spi_sendRecv(0x00); //Send 8 don't care bit.
+ spi_read(block, len); //Read len bytes ad put in block buffer.
+
+
+ CS_DISABLE();
+
+}
+
+
+/**
+ * Write \a len bytes in buffer buffer data flash memory.
+ *
+ * \note Isn't possible to write bytes directly in main memory data
+ * flash. To perform write in main memory you must before write in buffer
+ * data flash memory, an then send command to write page in main memory.
+ */
+static void dflash_write_block(dflashAddr_t byte_addr, DFlashOpcode opcode, uint8_t *block, dflashSize_t len)
+{
+
+ send_cmd(0x00, byte_addr, opcode);
+
+ spi_write(block, len); //Write len bytes.
+
+ CS_DISABLE();
+
+}
+
+/* Kfile interface section */
+
+/**
+ * Open data flash file \a fd
+ * \a name and \a mode are unused, cause flash memory is
+ * threated like one file.
+ */
+static bool dflash_open(struct _KFile *fd, UNUSED_ARG(const char *, name), UNUSED_ARG(int, mode))
+{
+}
+
+/**
+ * Close file \a fd
+ */
+static bool dflash_close(UNUSED_ARG(struct _KFile *,fd))
+{
+}
+
+/**
+ * Move \a fd file seek position of \a offset bytes
+ * from current position.
+ */
+static int32_t dflash_seek(struct _KFile *fd, int32_t offset, KSeekMode whence)
+{
+}
+
+/**
+ * Read from file \a fd \a size bytes and put it in buffer \a buf
+ * \return the number of bytes read.
+ */
+static size_t dflash_read(struct _KFile *fd, void *buf, size_t size)
+{
+}
+
+/**
+ * Init data flash memory interface.
+ */
+void dflash_init(struct _KFile *fd)
+{
+ // Set up data flash programming functions.
+ fd->open = dflash_open;
+ fd->close = dflash_close;
+ fd->read = dflash_read;
+ fd->write = dflash_write;
+ fd->seek = dflash_seek;
+
+ // Init data flash memory and micro pin.
+ ASSERT(dflash_pin_init());
+}
\ No newline at end of file