/*
* 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
*
* Example demonstrating the flash memory functionality on
* sensinode N740s
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#include "contiki.h"
#include "dev/leds.h"
#include "cc2430_sfr.h"
#include "8051def.h"
#include "dev/m25p16.h"
#include "dev/n740.h"
#define DEBUG 1
#if DEBUG
#include <stdio.h>
#include "debug.h"
#define PRINTF(...) printf(__VA_ARGS__)
#define PUTBIN(b) putbin(b)
#else
#define PRINTF(...)
#define PUTBIN(b)
#endif
static struct m25p16_rdid id;
#define USE_SECTOR 0x10
#define MAX_READ_CHUNK 10
static uint8_t r_addr[3]; /* Read address: {USE_SECTOR, 0, 0} */
static uint8_t d_buf[MAX_READ_CHUNK];
static uint8_t rv;
static uint8_t counter;
/*---------------------------------------------------------------------------*/
PROCESS(serial_flash_process, "Serial Flash example");
AUTOSTART_PROCESSES(&serial_flash_process);
/*---------------------------------------------------------------------------*/
static void
rdsr()
{
rv = 0;
n740_analog_deactivate();
rv = m25p16_rdsr();
n740_analog_activate();
PRINTF("RDSR: ");
putbin(rv);
PRINTF("\n");
}
/*---------------------------------------------------------------------------*/
static void
rdid()
{
uint8_t i;
memset(&id, 0, sizeof(struct m25p16_rdid));
n740_analog_deactivate();
m25p16_rdid(&id);
n740_analog_activate();
PRINTF("RDID: 0x%02x\n", id.man_id);
PRINTF("Type: 0x%02x\n", id.mem_type);
PRINTF("Size: 0x%02x\n", id.mem_size);
PRINTF("ULen: 0x%02x\n", id.uid_len);
PRINTF(" UID:");
for(i = 0; i < id.uid_len; i++) {
PRINTF(" %02x", id.uid[i]);
}
PRINTF("\n");
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(serial_flash_process, ev, data)
{
static struct etimer et;
uint8_t i;
PROCESS_BEGIN();
PRINTF("Start\n");
memset(r_addr, 0, 3);
r_addr[0] = USE_SECTOR;
counter = 1;
while(1) {
/* Delay */
etimer_set(&et, CLOCK_SECOND * 2);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
leds_on(LEDS_GREEN);
if(counter == 0) {
n740_analog_deactivate();
rv = m25p16_rdsr();
n740_analog_activate();
/* If counter==0, we started Bulk Erasing earlier. Check if we still are */
if(rv & M25P16_SR_WIP) {
PRINTF("Yield [%02x]\n", rv);
} else {
counter = 1;
}
}
if(counter) {
/*
* Take us out of Deep Power Down - On first power-on, the device will
* go to stand by mode (which is not DP). However, we drop to DP at the
* end of every loop. RES must be 0x14. This is the old style signature
* and is only still there for backward compatibility.
*/
n740_analog_deactivate();
rv = m25p16_res_res();
n740_analog_activate();
PRINTF(" RES: 0x%02x\n", rv);
n740_analog_deactivate();
rv = M25P16_WIP();
n740_analog_activate();
PRINTF("========\n");
memset(d_buf, 0, MAX_READ_CHUNK);
/*
* Read Device ID: Return values must be:
* man_id: 0x20 (Numonyx)
* mem_type: 0x20
* mem_size: 0x15 (2 ^ 0x15 bytes = 2MB)
* uid_len: number of bytes in UID
* uid: Either all zeroes or a customized factory data content
* */
rdid();
/* Check the value of our Status Register (SR) */
rdsr();
/* Enable Write: Set Bit 1 in the SR to 1 (bit WEL) */
PRINTF("WREN\n");
n740_analog_deactivate();
m25p16_wren();
n740_analog_activate();
/* Confirm: SR & 0x02 must be 1 */
rdsr();
/* Disable the WEL bit */
PRINTF("WRDI\n");
n740_analog_deactivate();
m25p16_wrdi();
n740_analog_activate();
/* Confirm: SR & 0x02 must be 0 */
rdsr();
/* Write something to the SR. We don't need to explicitly set WEL, wrsr()
* will do it for us. When the cycle ends, WEL will go low */
PRINTF("WRSR\n");
n740_analog_deactivate();
/* For instance, let's protect sector 31 (that's the highest one) */
m25p16_wrsr(M25P16_SR_BP0);
/*
* While this is running, WEL should remain high and WIP (bit 0) should
* also be high. When this ends, WIP and WEL will go low.
*
* While the write is in ongoing, we can still read the SR to check the
* cycle's progress
*/
while(M25P16_WIP());
n740_analog_activate();
/* Confirm: SR & 0x02 must be 0 */
rdsr();
/* Read MAX_READ_CHUNK bytes from Page 0x000000 */
memset(d_buf, 0, MAX_READ_CHUNK);
n740_analog_deactivate();
m25p16_read(r_addr, d_buf, MAX_READ_CHUNK);
n740_analog_activate();
PRINTF("READ:");
for(i = 0; i < MAX_READ_CHUNK; i++) {
PRINTF(" %02x", d_buf[i]);
}
PRINTF("\n");
/* Write MAX_READ_CHUNK bytes to the same Page */
PRINTF("WRITE\n");
for(i = 0; i < MAX_READ_CHUNK; i++) {
d_buf[i] = i;
}
n740_analog_deactivate();
/* We don't need to wren() explicitly, pp() will do that for us */
m25p16_pp(r_addr, d_buf, MAX_READ_CHUNK);
/* Wait for the cycle */
while(M25P16_WIP());
/* Trash our data buffer */
memset(d_buf, 0, MAX_READ_CHUNK);
PRINTF("ERASE\n");
n740_analog_deactivate();
/* Bulk erase every 4 loops, sector erase otherwise */
/* Bulk Erase: This takes a few seconds so we can't really block on it.
* It'd be a bad thing to do and the watchdog would bark anyway.
* Bulk Erase will only be accepted if all SR_BP[2:0] == 0 */
if((counter % 4) == 0) {
m25p16_wrsr(0);
while(M25P16_WIP());
m25p16_be();
counter = 0;
} else {
m25p16_se(USE_SECTOR);
while(M25P16_WIP());
/* Drop to Deep Power Down */
m25p16_dp();
counter++;
}
n740_analog_activate();
}
leds_off(LEDS_GREEN);
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/