altos: Add SDCARD and FAT16 filesystem support

This adds a fairly primitive FAT16 file system implementation
along with support for SD cards.

Signed-off-by: Keith Packard <keithp@keithp.com>

2 files changed, 122 insertions, 1 deletions

diff --git a/src/test/Makefile b/src/test/Makefile
index fccc7937..96170cc1 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -2,7 +2,7 @@ vpath % ..:../core:../drivers:../util:../micropeak
 
 PROGS=ao_flight_test ao_flight_test_baro ao_flight_test_accel ao_flight_test_noisy_accel ao_flight_test_mm \
 	ao_gps_test ao_gps_test_skytraq ao_convert_test ao_convert_pa_test ao_fec_test \
-	ao_aprs_test ao_micropeak_test
+	ao_aprs_test ao_micropeak_test ao_fat_test
 
 INCS=ao_kalman.h ao_ms5607.h ao_log.h ao_data.h altitude-pa.h altitude.h
 
@@ -64,3 +64,6 @@ check: ao_fec_test ao_flight_test ao_flight_test_baro run-tests
 
 ao_micropeak_test: ao_micropeak_test.c ao_microflight.c ao_kalman.h
 	cc $(CFLAGS) -o $@ ao_micropeak_test.c -lm
+
+ao_fat_test: ao_fat_test.c ao_fat.c ao_bufio.c
+	cc $(CFLAGS) -o $@ ao_fat_test.c
diff --git a/src/test/ao_fat_test.c b/src/test/ao_fat_test.c
new file mode 100644
index 00000000..22ac03ad
--- /dev/null
+++ b/src/test/ao_fat_test.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright © 2013 Keith Packard <keithp@keithp.com>
+ *
+ * This program 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; version 2 of the License.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <getopt.h>
+#include <math.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#define AO_FAT_TEST
+
+void
+ao_mutex_get(uint8_t *mutex)
+{
+}
+
+void
+ao_mutex_put(uint8_t *mutex)
+{
+}
+
+void
+ao_panic(uint8_t panic)
+{
+	printf ("panic %d\n", panic);
+	exit(1);
+}
+
+#define AO_PANIC_BUFIO	15
+
+#define ao_cmd_success	0
+
+uint8_t ao_cmd_status;
+uint32_t ao_cmd_lex_u32;
+
+void
+ao_cmd_decimal()
+{
+}
+
+#define ao_cmd_register(x)
+
+struct ao_cmds {
+	void		(*func)(void);
+	const char	*help;
+};
+
+int fs_fd;
+
+uint8_t
+ao_sdcard_read_block(uint32_t block, uint8_t *data)
+{
+	lseek(fs_fd, block * 512, 0);
+	return read(fs_fd, data, 512) == 512;
+}
+
+uint8_t
+ao_sdcard_write_block(uint32_t block, uint8_t *data)
+{
+	lseek(fs_fd, block * 512, 0);
+	return write(fs_fd, data, 512) == 512;
+}
+
+void
+ao_sdcard_init(void)
+{
+	fs_fd = open("fat.fs", 2);
+}
+
+#include "ao_bufio.c"
+#include "ao_fat.c"
+
+int
+main(int argc, char **argv)
+{
+	uint8_t	data[15];
+	int	len;
+	ao_fat_init();
+	ao_fat_test();
+	if (ao_fat_open("DATALOG TXT")) {
+		printf ("DATALOG.TXT\n");
+		while ((len = ao_fat_read(data, sizeof (data))) > 0) {
+			write(1, data, len);
+		}
+		ao_fat_close();
+//		ao_fat_unlink("DATALOG TXT");
+	}
+	if (ao_fat_open("NEWFILE TXT")) {
+		printf ("NEWFILE.TXT\n");
+		while ((len = ao_fat_read(data, sizeof (data))) > 0) {
+			write(1, data, len);
+		}
+		ao_fat_close();
+	}
+	if (ao_fat_creat ("NEWFILE TXT")) {
+		for (len = 0; len < 4095; len++)
+			ao_fat_write((uint8_t *) "hello, world!\n", 14);
+		ao_fat_close();
+	}
+	return 0;
+}