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_erase.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 "flash.h"
AjK 0:0a841b89d614 25 #include "ssp0.h"
AjK 0:0a841b89d614 26 #include "dma.h"
AjK 0:0a841b89d614 27 #include "gpio.h"
AjK 0:0a841b89d614 28 #include "rit.h"
AjK 0:0a841b89d614 29 #include "user.h"
AjK 0:0a841b89d614 30 #include "utils.h"
AjK 0:0a841b89d614 31 #include "debug.h"
AjK 0:0a841b89d614 32
AjK 0:0a841b89d614 33 /* Flags to show what state we are in. */
AjK 0:0a841b89d614 34 bool sector_erase_in_progress = false;
AjK 0:0a841b89d614 35 extern bool page_write_in_progress;
AjK 0:0a841b89d614 36
AjK 0:0a841b89d614 37 bool flash_sector_erase_in_progress(void) {
AjK 0:0a841b89d614 38 return sector_erase_in_progress;
AjK 0:0a841b89d614 39 }
AjK 0:0a841b89d614 40
AjK 0:0a841b89d614 41 /** flash_erase_sector
AjK 0:0a841b89d614 42 */
AjK 0:0a841b89d614 43 int flash_erase_sector(int sector) {
AjK 0:0a841b89d614 44
AjK 0:0a841b89d614 45 /* If a sector erase is in progress already
AjK 0:0a841b89d614 46 we return zero rather than wait (block)
AjK 0:0a841b89d614 47 because an erase can take so long to complete
AjK 0:0a841b89d614 48 we don't want to hang around waiting. Let the
AjK 0:0a841b89d614 49 caller reschedule it sometime later. */
AjK 0:0a841b89d614 50 if (sector_erase_in_progress) {
AjK 0:0a841b89d614 51 return 0;
AjK 0:0a841b89d614 52 }
AjK 0:0a841b89d614 53
AjK 0:0a841b89d614 54 /* Request use of SSP0. */
AjK 0:0a841b89d614 55 while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS;
AjK 0:0a841b89d614 56
AjK 0:0a841b89d614 57 sector_erase_in_progress = true;
AjK 0:0a841b89d614 58
AjK 0:0a841b89d614 59 FLASH_CS_ASSERT;
AjK 0:0a841b89d614 60 FLASH_SHORT_COMMAND(FLASH_WREN);
AjK 0:0a841b89d614 61 FLASH_CS_DEASSERT;
AjK 0:0a841b89d614 62
AjK 0:0a841b89d614 63 SSP0_FLUSH_RX_FIFO;
AjK 0:0a841b89d614 64
AjK 0:0a841b89d614 65 /* Wait until the flash device has the WEL bit on. */
AjK 0:0a841b89d614 66 while ((LPC_SSP0->DR & 0x2) == 0) {
AjK 0:0a841b89d614 67 FLASH_CS_ASSERT;
AjK 0:0a841b89d614 68 FLASH_SHORT_COMMAND(FLASH_RDSR);
AjK 0:0a841b89d614 69 SSP0_FLUSH_RX_FIFO;
AjK 0:0a841b89d614 70 SSP0_WRITE_BYTE(0);
AjK 0:0a841b89d614 71 while (SSP0_IS_BUSY);
AjK 0:0a841b89d614 72 FLASH_CS_DEASSERT;
AjK 0:0a841b89d614 73 }
AjK 0:0a841b89d614 74
AjK 0:0a841b89d614 75 SSP0_FLUSH_RX_FIFO;
AjK 0:0a841b89d614 76
AjK 0:0a841b89d614 77 FLASH_CS_ASSERT;
AjK 0:0a841b89d614 78 FLASH_LONG_COMMAND(FLASH_SE, sector);
AjK 0:0a841b89d614 79 FLASH_CS_DEASSERT;
AjK 0:0a841b89d614 80
AjK 0:0a841b89d614 81 /* Note, a sector erase takes much longer than
AjK 0:0a841b89d614 82 a page write (typical 600ms by the datasheet)
AjK 0:0a841b89d614 83 so there's no point making the first timeout
AjK 0:0a841b89d614 84 very short and producing a lot of uneeded
AjK 0:0a841b89d614 85 interrupts. So we set the first timeout to
AjK 0:0a841b89d614 86 be 600 and then it'll switch to a much shorter
AjK 0:0a841b89d614 87 time in the ISR. */
AjK 0:0a841b89d614 88 rit_timer_set_counter(FLASH_WRITE_CB, 600);
AjK 0:0a841b89d614 89 return 1;
AjK 0:0a841b89d614 90 }
AjK 0:0a841b89d614 91
AjK 0:0a841b89d614 92 /** flash_erase_bulk
AjK 0:0a841b89d614 93 */
AjK 0:0a841b89d614 94 int flash_erase_bulk(void) {
AjK 0:0a841b89d614 95
AjK 0:0a841b89d614 96 /* If a sector erase is in progress already
AjK 0:0a841b89d614 97 we return zero rather than wait (block)
AjK 0:0a841b89d614 98 because an erase can take so long to complete
AjK 0:0a841b89d614 99 we don't want to hang around waiting. Let the
AjK 0:0a841b89d614 100 caller reschedule it sometime later. */
AjK 0:0a841b89d614 101
AjK 0:0a841b89d614 102 if (sector_erase_in_progress || page_write_in_progress) {
AjK 0:0a841b89d614 103 return 0;
AjK 0:0a841b89d614 104 }
AjK 0:0a841b89d614 105
AjK 0:0a841b89d614 106 /* Request use of SSP0. */
AjK 0:0a841b89d614 107 while(!SSP0_request()) WHILE_WAITING_DO_PROCESS_FUNCTIONS;
AjK 0:0a841b89d614 108
AjK 0:0a841b89d614 109 sector_erase_in_progress = true;
AjK 0:0a841b89d614 110
AjK 0:0a841b89d614 111 FLASH_CS_ASSERT;
AjK 0:0a841b89d614 112 FLASH_SHORT_COMMAND(FLASH_WREN);
AjK 0:0a841b89d614 113 FLASH_CS_DEASSERT;
AjK 0:0a841b89d614 114
AjK 0:0a841b89d614 115 SSP0_FLUSH_RX_FIFO;
AjK 0:0a841b89d614 116
AjK 0:0a841b89d614 117 /* Wait until the flash device has the WEL bit on. */
AjK 0:0a841b89d614 118 while ((LPC_SSP0->DR & 0x2) == 0) {
AjK 0:0a841b89d614 119 FLASH_CS_ASSERT;
AjK 0:0a841b89d614 120 FLASH_SHORT_COMMAND(FLASH_RDSR);
AjK 0:0a841b89d614 121 SSP0_FLUSH_RX_FIFO;
AjK 0:0a841b89d614 122 SSP0_WRITE_BYTE(0);
AjK 0:0a841b89d614 123 while (SSP0_IS_BUSY);
AjK 0:0a841b89d614 124 FLASH_CS_DEASSERT;
AjK 0:0a841b89d614 125 }
AjK 0:0a841b89d614 126
AjK 0:0a841b89d614 127 FLASH_CS_ASSERT;
AjK 0:0a841b89d614 128 FLASH_SHORT_COMMAND(FLASH_BE);
AjK 0:0a841b89d614 129 FLASH_CS_DEASSERT;
AjK 0:0a841b89d614 130
AjK 0:0a841b89d614 131 /* Note, a bulk erase takes much longer than
AjK 0:0a841b89d614 132 a page write (typical 8s by the datasheet)
AjK 0:0a841b89d614 133 so there's no point making the first timeout
AjK 0:0a841b89d614 134 very short and producing a lot of uneeded
AjK 0:0a841b89d614 135 interrupts. So we set the first timeout to
AjK 0:0a841b89d614 136 be 8000 and then it'll switch to a much shorter
AjK 0:0a841b89d614 137 time in the ISR. */
AjK 0:0a841b89d614 138 rit_timer_set_counter(FLASH_WRITE_CB, 8000);
AjK 0:0a841b89d614 139 return 1;
AjK 0:0a841b89d614 140 }
AjK 0:0a841b89d614 141