osd-contiki/platform/sensinode/dev/m25p16.c

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2012-03-05 17:28:06 +01:00
/*
* Copyright (c) 2010, Loughborough University - Computer Science
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* This file provides functions to control the M25P16 on sensinode N740s.
* This is a Numonyx Forte Serial Flash Memory (16Mbit)
* The S signal (Chip Select) is controlled via 0x02 on the 74HC595D
* The other instructions and timing are performed with bit bang
*
* We can enable, disable, read/write data, erase pages, hold, enter/exit
* deep sleep etc.
*
* Clock (C) => P1_5,
* Ser. I (D) => P1_6,
* Ser. O (Q) => P1_7,
* Hold => Pull Up,
* Write Prot => Pull Up,
* Chip Sel => 74HC595D (0x02)
*
* This file can be placed in any bank.
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#include "dev/n740.h"
#include "dev/m25p16.h"
#include "sys/clock.h"
#include "sys/energest.h"
#include "cc2430_sfr.h"
#define CLOCK_RISING() {M25P16_PIN_CLOCK = 1; M25P16_PIN_CLOCK = 0;}
#define CLOCK_FALLING() {M25P16_PIN_CLOCK = 0; M25P16_PIN_CLOCK = 1;}
/*---------------------------------------------------------------------------*/
/* Bit-Bang write a byte to the chip */
static void
bit_bang_write(uint8_t byte) CC_NON_BANKED
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{
uint8_t i;
uint8_t bit;
/* bit-by-bit */
for(i = 0x80; i > 0; i >>= 1) {
/* Is the bit set? */
bit = 0;
if(i & byte) {
/* If it was set, we want to send 1 */
bit = 1;
}
/* Send the bit */
M25P16_PIN_SER_I = bit;
/* Clock - Rising */
CLOCK_RISING();
}
}
/*---------------------------------------------------------------------------*/
/* Bit-Bang read a byte from the chip */
static uint8_t
bit_bang_read() CC_NON_BANKED
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{
int8_t i;
uint8_t bits = 0;
/* bit-by-bit */
for(i = 7; i >= 0; i--) {
/* Clock - Falling */
CLOCK_FALLING();
/* Read the bit */
bits |= (M25P16_PIN_SER_O << i);
}
return bits;
}
/*---------------------------------------------------------------------------*/
static void
select() CC_NON_BANKED
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{
/* Read current ser/par value */
uint8_t ser_par = n740_ser_par_get();
M25P16_PIN_CLOCK = 0;
ser_par &= ~N740_SER_PAR_CHIP_SEL; /* Select Flash */
/* Write the new status back to the ser/par */
n740_ser_par_set(ser_par);
}
/*---------------------------------------------------------------------------*/
static void
deselect() CC_NON_BANKED
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{
/* Read current ser/par value */
uint8_t ser_par = n740_ser_par_get();
ser_par |= N740_SER_PAR_CHIP_SEL; /* De-Select Flash */
/* Write the new status back to the ser/par */
n740_ser_par_set(ser_par);
}
/*---------------------------------------------------------------------------*/
void
m25p16_wren()
{
select();
bit_bang_write(M25P16_I_WREN);
deselect();
while(!M25P16_WEL());
}
/*---------------------------------------------------------------------------*/
void
m25p16_wrdi()
{
select();
bit_bang_write(M25P16_I_WRDI);
deselect();
}
/*---------------------------------------------------------------------------*/
void
m25p16_rdid(struct m25p16_rdid * rdid)
{
uint8_t i;
select();
bit_bang_write(M25P16_I_RDID);
rdid->man_id = bit_bang_read();
rdid->mem_type = bit_bang_read(); /* Device ID MSB */
rdid->mem_size = bit_bang_read(); /* Device ID LSB */
rdid->uid_len = bit_bang_read();
for(i = 0; i < rdid->uid_len; i++) {
rdid->uid[i] = bit_bang_read();
}
deselect();
}
/*---------------------------------------------------------------------------*/
uint8_t
m25p16_rdsr()
{
uint8_t rv;
select();
bit_bang_write(M25P16_I_RDSR);
rv = bit_bang_read();
deselect();
return rv;
}
/*---------------------------------------------------------------------------*/
void
m25p16_wrsr(uint8_t val)
{
m25p16_wren(); /* Write Enable */
select();
ENERGEST_ON(ENERGEST_TYPE_FLASH_WRITE);
bit_bang_write(M25P16_I_WRSR);
bit_bang_write(val);
ENERGEST_OFF(ENERGEST_TYPE_FLASH_WRITE);
deselect();
}
/*---------------------------------------------------------------------------*/
void
m25p16_read(uint8_t * addr, uint8_t * buff, uint8_t buff_len)
{
uint8_t i;
select();
ENERGEST_ON(ENERGEST_TYPE_FLASH_READ);
#if M25P16_READ_FAST
bit_bang_write(M25P16_I_FAST_READ);
#else
bit_bang_write(M25P16_I_READ);
#endif
/* Write the address, MSB in addr[0], bits [7:5] of the MSB: 'don't care' */
for(i = 0; i < 3; i++) {
bit_bang_write(addr[i]);
}
/* For FAST_READ, send the dummy byte */
#if M25P16_READ_FAST
bit_bang_write(M25P16_DUMMY_BYTE);
#endif
for(i = 0; i < buff_len; i++) {
buff[i] = ~bit_bang_read();
}
ENERGEST_OFF(ENERGEST_TYPE_FLASH_READ);
deselect();
}
/*---------------------------------------------------------------------------*/
void
m25p16_pp(uint8_t * addr, uint8_t * buff, uint8_t buff_len)
{
uint8_t i;
m25p16_wren(); /* Write Enable */
select();
ENERGEST_ON(ENERGEST_TYPE_FLASH_WRITE);
bit_bang_write(M25P16_I_PP);
/* Write the address, MSB in addr[0] */
for(i = 0; i < 3; i++) {
bit_bang_write(addr[i]);
}
/* Write the bytes */
for(i=0; i<buff_len; i++) {
bit_bang_write(~buff[i]);
}
ENERGEST_OFF(ENERGEST_TYPE_FLASH_WRITE);
deselect();
}
/*---------------------------------------------------------------------------*/
void
m25p16_se(uint8_t s)
{
m25p16_wren(); /* Write Enable */
select();
ENERGEST_ON(ENERGEST_TYPE_FLASH_WRITE);
bit_bang_write(M25P16_I_SE);
bit_bang_write(s);
bit_bang_write(0x00);
bit_bang_write(0x00);
deselect();
ENERGEST_OFF(ENERGEST_TYPE_FLASH_WRITE);
}
/*---------------------------------------------------------------------------*/
void
m25p16_be()
{
m25p16_wren(); /* Write Enable */
select();
bit_bang_write(M25P16_I_BE);
deselect();
}
/*---------------------------------------------------------------------------*/
void
m25p16_dp()
{
select();
bit_bang_write(M25P16_I_DP);
deselect();
}
/*---------------------------------------------------------------------------*/
/*
* Release Deep Power Down. We do NOT read the Electronic Signature
*/
void
m25p16_res() {
select();
bit_bang_write(M25P16_I_RES);
deselect();
/* a few usec between RES and standby */
while(M25P16_WIP());
}
/*---------------------------------------------------------------------------*/
/**
* Release Deep Power Down. Read and return the Electronic Signature
* must return 0x14
*
* \return The old style Electronic Signature. This must be 0x14
*/
uint8_t
m25p16_res_res() {
uint8_t rv;
select();
bit_bang_write(M25P16_I_RES);
bit_bang_write(M25P16_DUMMY_BYTE);
bit_bang_write(M25P16_DUMMY_BYTE);
bit_bang_write(M25P16_DUMMY_BYTE);
rv = bit_bang_read();
deselect();
/* a few usec between RES and standby */
while(M25P16_WIP());
return rv;
}
/*---------------------------------------------------------------------------*/