Andy K / Mbed 2 deprecated SOWB

Satellite Observers Workbench. NOT yet complete, just published for forum posters to \"cherry pick\" pieces of code as requiered as an example.

Dependencies:   mbed

flash/flash.c@0:0a841b89d614, 2010-10-11 (annotated)

Committer:
AjK
Date:
Mon Oct 11 10:34:55 2010 +0000
Revision:
0:0a841b89d614
Totally Alpha quality as this project isn\t completed. Just publishing it as it answers many questions asked in the forums

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AjK 0:0a841b89d614 1 /****************************************************************************
AjK 0:0a841b89d614 2 * Copyright 2010 Andy Kirkham, Stellar Technologies Ltd
AjK 0:0a841b89d614 3 *
AjK 0:0a841b89d614 4 * This file is part of the Satellite Observers Workbench (SOWB).
AjK 0:0a841b89d614 5 *
AjK 0:0a841b89d614 6 * SOWB is free software: you can redistribute it and/or modify
AjK 0:0a841b89d614 7 * it under the terms of the GNU General Public License as published by
AjK 0:0a841b89d614 8 * the Free Software Foundation, either version 3 of the License, or
AjK 0:0a841b89d614 9 * (at your option) any later version.
AjK 0:0a841b89d614 10 *
AjK 0:0a841b89d614 11 * SOWB is distributed in the hope that it will be useful,
AjK 0:0a841b89d614 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
AjK 0:0a841b89d614 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
AjK 0:0a841b89d614 14 * GNU General Public License for more details.
AjK 0:0a841b89d614 15 *
AjK 0:0a841b89d614 16 * You should have received a copy of the GNU General Public License
AjK 0:0a841b89d614 17 * along with SOWB. If not, see <http://www.gnu.org/licenses/>.
AjK 0:0a841b89d614 18 *
AjK 0:0a841b89d614 19 * $Id: main.cpp 5 2010-07-12 20:51:11Z ajk $
AjK 0:0a841b89d614 20 *
AjK 0:0a841b89d614 21 ***************************************************************************/
AjK 0:0a841b89d614 22
AjK 0:0a841b89d614 23 #include "sowb.h"
AjK 0:0a841b89d614 24 #include "debug.h"
AjK 0:0a841b89d614 25 #include "ssp0.h"
AjK 0:0a841b89d614 26 #include "gpio.h"
AjK 0:0a841b89d614 27 #include "flash.h"
AjK 0:0a841b89d614 28 #include "user.h"
AjK 0:0a841b89d614 29
AjK 0:0a841b89d614 30 extern bool sector_erase_in_progress;
AjK 0:0a841b89d614 31 extern bool page_write_in_progress;
AjK 0:0a841b89d614 32
AjK 0:0a841b89d614 33 char flash_buffer[2][FLASH_PAGE_SIZE];
AjK 0:0a841b89d614 34 int current_buffer;
AjK 0:0a841b89d614 35 unsigned int flash_address;
AjK 0:0a841b89d614 36
AjK 0:0a841b89d614 37 /** flash_init
AjK 0:0a841b89d614 38 */
AjK 0:0a841b89d614 39 void flash_init(void) {
AjK 0:0a841b89d614 40
AjK 0:0a841b89d614 41 /* Initialise the SSP0 to talk to the flash device. */
AjK 0:0a841b89d614 42 SSP0_init();
AjK 0:0a841b89d614 43
AjK 0:0a841b89d614 44 DEBUG_INIT_START;
AjK 0:0a841b89d614 45
AjK 0:0a841b89d614 46 /* Clear out the page buffers. */
AjK 0:0a841b89d614 47 memset(flash_buffer, 0, 2 * FLASH_PAGE_SIZE);
AjK 0:0a841b89d614 48
AjK 0:0a841b89d614 49 /* Default the buffer in use. */
AjK 0:0a841b89d614 50 current_buffer = 0;
AjK 0:0a841b89d614 51
AjK 0:0a841b89d614 52 /* Default pointer set-up. */
AjK 0:0a841b89d614 53 flash_address = 0;
AjK 0:0a841b89d614 54
AjK 0:0a841b89d614 55 /* Prime our buffers for expected future access. */
AjK 0:0a841b89d614 56 flash_read_page(0, flash_buffer[0], true);
AjK 0:0a841b89d614 57 flash_read_page(1, flash_buffer[1], true);
AjK 0:0a841b89d614 58
AjK 0:0a841b89d614 59 /* Although not part of the flash system, SOWB includes
AjK 0:0a841b89d614 60 a 25AA02E48 device from Microchip that holds a globally
AjK 0:0a841b89d614 61 unique 48bit (6byte) MAC address. We use this for the
AjK 0:0a841b89d614 62 SOWB "STL authentic product" serial number and in future
AjK 0:0a841b89d614 63 may be used as the ethernet MAC address if we ever write
AjK 0:0a841b89d614 64 code to support Ethernet. This device is also connected
AjK 0:0a841b89d614 65 to SSP1 and so we'll _init() it here now. */
AjK 0:0a841b89d614 66 //_25AA02E48_init();
AjK 0:0a841b89d614 67
AjK 0:0a841b89d614 68 DEBUG_INIT_END;
AjK 0:0a841b89d614 69 }
AjK 0:0a841b89d614 70
AjK 0:0a841b89d614 71 /** flash_process
AjK 0:0a841b89d614 72 */
AjK 0:0a841b89d614 73 void flash_process(void) {
AjK 0:0a841b89d614 74 /* Currently does nothing. */
AjK 0:0a841b89d614 75 }
AjK 0:0a841b89d614 76
AjK 0:0a841b89d614 77 /** flash_getc
AjK 0:0a841b89d614 78 */
AjK 0:0a841b89d614 79 char flash_getc(bool peek) {
AjK 0:0a841b89d614 80 char c;
AjK 0:0a841b89d614 81
AjK 0:0a841b89d614 82 /* Flash being deleted, undefined memory. */
AjK 0:0a841b89d614 83 if (sector_erase_in_progress) return 0xFF;
AjK 0:0a841b89d614 84
AjK 0:0a841b89d614 85 /* Wait for any page loads to complete. */
AjK 0:0a841b89d614 86 while (page_write_in_progress) user_call_process();
AjK 0:0a841b89d614 87
AjK 0:0a841b89d614 88 /* Get the character from the internal buffer. */
AjK 0:0a841b89d614 89 c = flash_buffer[current_buffer][flash_address];
AjK 0:0a841b89d614 90
AjK 0:0a841b89d614 91 /* If this is just a peek then return the character without
AjK 0:0a841b89d614 92 incrementing the memory pointers etc etc. */
AjK 0:0a841b89d614 93 if (peek) return c;
AjK 0:0a841b89d614 94
AjK 0:0a841b89d614 95 /* Inc the address pointer and load a new page if needed. Note,
AjK 0:0a841b89d614 96 we load the page in background using DMA. */
AjK 0:0a841b89d614 97 flash_address++;
AjK 0:0a841b89d614 98 if ((flash_address & 0xFF) == 0) {
AjK 0:0a841b89d614 99 flash_read_page(current_buffer >> 8, flash_buffer[current_buffer], false);
AjK 0:0a841b89d614 100 current_buffer = current_buffer ? 0 : 1;
AjK 0:0a841b89d614 101 }
AjK 0:0a841b89d614 102
AjK 0:0a841b89d614 103 return c;
AjK 0:0a841b89d614 104 }
AjK 0:0a841b89d614 105
AjK 0:0a841b89d614 106 /** flash_seek
AjK 0:0a841b89d614 107 */
AjK 0:0a841b89d614 108 void flash_seek(unsigned int addr) {
AjK 0:0a841b89d614 109 flash_read_page((addr >> 8) + 0, flash_buffer[0], true);
AjK 0:0a841b89d614 110 flash_read_page((addr >> 8) + 1, flash_buffer[1], true);
AjK 0:0a841b89d614 111 flash_address = addr;
AjK 0:0a841b89d614 112 }