--- /dev/null
+/*
+ * Copyright © 2012 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 <ao.h>
+#include <ao_micropeak.h>
+#include <ao_log_micro.h>
+#include <ao_async.h>
+
+static uint16_t ao_log_offset = STARTING_LOG_OFFSET;
+
+void
+ao_log_micro_save(void)
+{
+ uint16_t n_samples = (ao_log_offset - STARTING_LOG_OFFSET) / sizeof (uint16_t);
+ ao_eeprom_write(PA_GROUND_OFFSET, &pa_ground, sizeof (pa_ground));
+ ao_eeprom_write(PA_MIN_OFFSET, &pa_min, sizeof (pa_min));
+ ao_eeprom_write(N_SAMPLES_OFFSET, &n_samples, sizeof (n_samples));
+}
+
+void
+ao_log_micro_restore(void)
+{
+ ao_eeprom_read(PA_GROUND_OFFSET, &pa_ground, sizeof (pa_ground));
+ ao_eeprom_read(PA_MIN_OFFSET, &pa_min, sizeof (pa_min));
+}
+
+void
+ao_log_micro_data(void)
+{
+ uint16_t low_bits = pa;
+
+ if (ao_log_offset < MAX_LOG_OFFSET) {
+ ao_eeprom_write(ao_log_offset, &low_bits, sizeof (low_bits));
+ ao_log_offset += sizeof (low_bits);
+ }
+}
+
+#define POLY 0x8408
+
+static uint16_t
+ao_log_micro_crc(uint16_t crc, uint8_t byte)
+{
+ uint8_t i;
+
+ for (i = 0; i < 8; i++) {
+ if ((crc & 0x0001) ^ (byte & 0x0001))
+ crc = (crc >> 1) ^ POLY;
+ else
+ crc = crc >> 1;
+ byte >>= 1;
+ }
+ return crc;
+}
+
+static void
+ao_log_hex_nibble(uint8_t b)
+{
+ if (b < 10)
+ ao_async_byte('0' + b);
+ else
+ ao_async_byte('a' - 10 + b);
+}
+
+static void
+ao_log_hex(uint8_t b)
+{
+ ao_log_hex_nibble(b>>4);
+ ao_log_hex_nibble(b&0xf);
+}
+
+static void
+ao_log_newline(void)
+{
+ ao_async_byte('\r');
+ ao_async_byte('\n');
+}
+
+void
+ao_log_micro_dump(void)
+{
+ uint16_t n_samples;
+ uint16_t nbytes;
+ uint8_t byte;
+ uint16_t b;
+ uint16_t crc = 0xffff;
+
+ ao_eeprom_read(N_SAMPLES_OFFSET, &n_samples, sizeof (n_samples));
+ if (n_samples == 0xffff)
+ n_samples = 0;
+ nbytes = STARTING_LOG_OFFSET + sizeof (uint16_t) * n_samples;
+ ao_async_start();
+ ao_async_byte('M');
+ ao_async_byte('P');
+ for (b = 0; b < nbytes; b++) {
+ if ((b & 0xf) == 0)
+ ao_log_newline();
+ ao_eeprom_read(b, &byte, 1);
+ ao_log_hex(byte);
+ crc = ao_log_micro_crc(crc, byte);
+ }
+ ao_log_newline();
+ crc = ~crc;
+ ao_log_hex(crc >> 8);
+ ao_log_hex(crc);
+ ao_log_newline();
+ ao_async_stop();
+}