Satellite Observers Workbench. NOT yet complete, just published for forum posters to \"cherry pick\" pieces of code as requiered as an example.
sdcard/sdcard.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?
User | Revision | Line number | New 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 "user.h" |
AjK | 0:0a841b89d614 | 25 | #include "debug.h" |
AjK | 0:0a841b89d614 | 26 | #include "rit.h" |
AjK | 0:0a841b89d614 | 27 | #include "gps.h" |
AjK | 0:0a841b89d614 | 28 | #include "gpio.h" |
AjK | 0:0a841b89d614 | 29 | #include "ff.h" |
AjK | 0:0a841b89d614 | 30 | |
AjK | 0:0a841b89d614 | 31 | FATFS MyFileSystem; |
AjK | 0:0a841b89d614 | 32 | bool card_detected_A; |
AjK | 0:0a841b89d614 | 33 | bool card_detected_B; |
AjK | 0:0a841b89d614 | 34 | bool card_mounted; |
AjK | 0:0a841b89d614 | 35 | bool card_bad; |
AjK | 0:0a841b89d614 | 36 | uint32_t sdcard_detect_shift_register; |
AjK | 0:0a841b89d614 | 37 | |
AjK | 0:0a841b89d614 | 38 | /** sdcard_is_mounted |
AjK | 0:0a841b89d614 | 39 | * |
AjK | 0:0a841b89d614 | 40 | * Tell the caller if an SD card is mounted. |
AjK | 0:0a841b89d614 | 41 | * |
AjK | 0:0a841b89d614 | 42 | * @return bool True if a card is mounted, false otherwise. |
AjK | 0:0a841b89d614 | 43 | */ |
AjK | 0:0a841b89d614 | 44 | bool sdcard_is_mounted(void) { |
AjK | 0:0a841b89d614 | 45 | return card_mounted; |
AjK | 0:0a841b89d614 | 46 | } |
AjK | 0:0a841b89d614 | 47 | |
AjK | 0:0a841b89d614 | 48 | /** sdcard_init() |
AjK | 0:0a841b89d614 | 49 | */ |
AjK | 0:0a841b89d614 | 50 | void sdcard_init(void) { |
AjK | 0:0a841b89d614 | 51 | DEBUG_INIT_START; |
AjK | 0:0a841b89d614 | 52 | card_bad = false; |
AjK | 0:0a841b89d614 | 53 | card_mounted = false; |
AjK | 0:0a841b89d614 | 54 | card_detected_A = false; |
AjK | 0:0a841b89d614 | 55 | card_detected_B = false; |
AjK | 0:0a841b89d614 | 56 | sdcard_detect_shift_register = 0; |
AjK | 0:0a841b89d614 | 57 | rit_timer_set_counter(SDCARD_TIMER_CB, 10); |
AjK | 0:0a841b89d614 | 58 | DEBUG_INIT_END; |
AjK | 0:0a841b89d614 | 59 | } |
AjK | 0:0a841b89d614 | 60 | |
AjK | 0:0a841b89d614 | 61 | /** sdcard_process() |
AjK | 0:0a841b89d614 | 62 | */ |
AjK | 0:0a841b89d614 | 63 | void sdcard_process(void) { |
AjK | 0:0a841b89d614 | 64 | int retry; |
AjK | 0:0a841b89d614 | 65 | int f_return; |
AjK | 0:0a841b89d614 | 66 | DIR root_directory; |
AjK | 0:0a841b89d614 | 67 | |
AjK | 0:0a841b89d614 | 68 | /* card_detected_A is set by the RIT timer callback below which performs |
AjK | 0:0a841b89d614 | 69 | a rough debounce of the switch. So, if here we need to do a rising |
AjK | 0:0a841b89d614 | 70 | edge detect so we only flag a card insertion once. */ |
AjK | 0:0a841b89d614 | 71 | if (card_detected_A && !card_detected_B && !card_mounted && !card_bad) { |
AjK | 0:0a841b89d614 | 72 | card_detected_B = true; |
AjK | 0:0a841b89d614 | 73 | debug_printf("Card insertion detected.\r\n"); |
AjK | 0:0a841b89d614 | 74 | /* Have found that some cards require a "kick" to bring them to |
AjK | 0:0a841b89d614 | 75 | life. So we retry 3 times to init the card. If after 3 tries |
AjK | 0:0a841b89d614 | 76 | it fails we mark the card as "bad". */ |
AjK | 0:0a841b89d614 | 77 | for(retry = 0; retry < 3; retry++) { |
AjK | 0:0a841b89d614 | 78 | KICK_WATCHDOG; |
AjK | 0:0a841b89d614 | 79 | f_return = f_mount(0,&MyFileSystem); |
AjK | 0:0a841b89d614 | 80 | if (f_return == FR_OK) { |
AjK | 0:0a841b89d614 | 81 | f_return = f_opendir(&root_directory, "/"); |
AjK | 0:0a841b89d614 | 82 | if (f_return == FR_OK) { |
AjK | 0:0a841b89d614 | 83 | card_mounted = true; |
AjK | 0:0a841b89d614 | 84 | debug_printf("SD card mounted.\r\n"); |
AjK | 0:0a841b89d614 | 85 | retry = 3; /* Break loop. */ |
AjK | 0:0a841b89d614 | 86 | } |
AjK | 0:0a841b89d614 | 87 | } |
AjK | 0:0a841b89d614 | 88 | } |
AjK | 0:0a841b89d614 | 89 | |
AjK | 0:0a841b89d614 | 90 | if (!card_mounted) { |
AjK | 0:0a841b89d614 | 91 | card_bad = true; |
AjK | 0:0a841b89d614 | 92 | debug_printf("Failed to mount SD Card\r\n"); |
AjK | 0:0a841b89d614 | 93 | } |
AjK | 0:0a841b89d614 | 94 | } |
AjK | 0:0a841b89d614 | 95 | } |
AjK | 0:0a841b89d614 | 96 | |
AjK | 0:0a841b89d614 | 97 | /** _sdcard_timer_callback |
AjK | 0:0a841b89d614 | 98 | * |
AjK | 0:0a841b89d614 | 99 | * RIT timer callback. |
AjK | 0:0a841b89d614 | 100 | * @see rit.c |
AjK | 0:0a841b89d614 | 101 | */ |
AjK | 0:0a841b89d614 | 102 | void _sdcard_timer_callback(int index) { |
AjK | 0:0a841b89d614 | 103 | |
AjK | 0:0a841b89d614 | 104 | /* Shift left 1bit... */ |
AjK | 0:0a841b89d614 | 105 | sdcard_detect_shift_register = sdcard_detect_shift_register << 1; |
AjK | 0:0a841b89d614 | 106 | |
AjK | 0:0a841b89d614 | 107 | /* And then mask in bit0 position. */ |
AjK | 0:0a841b89d614 | 108 | if (SDCARD_DETECT != 0) { |
AjK | 0:0a841b89d614 | 109 | sdcard_detect_shift_register |= 1; |
AjK | 0:0a841b89d614 | 110 | } |
AjK | 0:0a841b89d614 | 111 | |
AjK | 0:0a841b89d614 | 112 | /* 16 consecutive 1s mean card detected. Rough debouncing of the |
AjK | 0:0a841b89d614 | 113 | mechanical "card detect" switch in the SD card holder. */ |
AjK | 0:0a841b89d614 | 114 | if ((sdcard_detect_shift_register & 0x0000FFFFUL) == 0x0000FFFFUL) { |
AjK | 0:0a841b89d614 | 115 | card_detected_A = true; |
AjK | 0:0a841b89d614 | 116 | } |
AjK | 0:0a841b89d614 | 117 | else { |
AjK | 0:0a841b89d614 | 118 | card_bad = false; |
AjK | 0:0a841b89d614 | 119 | card_mounted = false; |
AjK | 0:0a841b89d614 | 120 | card_detected_A = false; |
AjK | 0:0a841b89d614 | 121 | card_detected_B = false; |
AjK | 0:0a841b89d614 | 122 | } |
AjK | 0:0a841b89d614 | 123 | |
AjK | 0:0a841b89d614 | 124 | /* Restart timer. */ |
AjK | 0:0a841b89d614 | 125 | rit_timer_set_counter(SDCARD_TIMER_CB, 10); |
AjK | 0:0a841b89d614 | 126 | } |