Satellite Observers Workbench. NOT yet complete, just published for forum posters to \"cherry pick\" pieces of code as requiered as an example.
Diff: sdcard/sdcard.c
- Revision:
- 0:0a841b89d614
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/sdcard/sdcard.c Mon Oct 11 10:34:55 2010 +0000 @@ -0,0 +1,126 @@ +/**************************************************************************** + * Copyright 2010 Andy Kirkham, Stellar Technologies Ltd + * + * This file is part of the Satellite Observers Workbench (SOWB). + * + * SOWB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * SOWB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with SOWB. If not, see <http://www.gnu.org/licenses/>. + * + * $Id: main.cpp 5 2010-07-12 20:51:11Z ajk $ + * + ***************************************************************************/ + +#include "sowb.h" +#include "user.h" +#include "debug.h" +#include "rit.h" +#include "gps.h" +#include "gpio.h" +#include "ff.h" + +FATFS MyFileSystem; +bool card_detected_A; +bool card_detected_B; +bool card_mounted; +bool card_bad; +uint32_t sdcard_detect_shift_register; + +/** sdcard_is_mounted + * + * Tell the caller if an SD card is mounted. + * + * @return bool True if a card is mounted, false otherwise. + */ +bool sdcard_is_mounted(void) { + return card_mounted; +} + +/** sdcard_init() + */ +void sdcard_init(void) { + DEBUG_INIT_START; + card_bad = false; + card_mounted = false; + card_detected_A = false; + card_detected_B = false; + sdcard_detect_shift_register = 0; + rit_timer_set_counter(SDCARD_TIMER_CB, 10); + DEBUG_INIT_END; +} + +/** sdcard_process() + */ +void sdcard_process(void) { + int retry; + int f_return; + DIR root_directory; + + /* card_detected_A is set by the RIT timer callback below which performs + a rough debounce of the switch. So, if here we need to do a rising + edge detect so we only flag a card insertion once. */ + if (card_detected_A && !card_detected_B && !card_mounted && !card_bad) { + card_detected_B = true; + debug_printf("Card insertion detected.\r\n"); + /* Have found that some cards require a "kick" to bring them to + life. So we retry 3 times to init the card. If after 3 tries + it fails we mark the card as "bad". */ + for(retry = 0; retry < 3; retry++) { + KICK_WATCHDOG; + f_return = f_mount(0,&MyFileSystem); + if (f_return == FR_OK) { + f_return = f_opendir(&root_directory, "/"); + if (f_return == FR_OK) { + card_mounted = true; + debug_printf("SD card mounted.\r\n"); + retry = 3; /* Break loop. */ + } + } + } + + if (!card_mounted) { + card_bad = true; + debug_printf("Failed to mount SD Card\r\n"); + } + } +} + +/** _sdcard_timer_callback + * + * RIT timer callback. + * @see rit.c + */ +void _sdcard_timer_callback(int index) { + + /* Shift left 1bit... */ + sdcard_detect_shift_register = sdcard_detect_shift_register << 1; + + /* And then mask in bit0 position. */ + if (SDCARD_DETECT != 0) { + sdcard_detect_shift_register |= 1; + } + + /* 16 consecutive 1s mean card detected. Rough debouncing of the + mechanical "card detect" switch in the SD card holder. */ + if ((sdcard_detect_shift_register & 0x0000FFFFUL) == 0x0000FFFFUL) { + card_detected_A = true; + } + else { + card_bad = false; + card_mounted = false; + card_detected_A = false; + card_detected_B = false; + } + + /* Restart timer. */ + rit_timer_set_counter(SDCARD_TIMER_CB, 10); +}