1 files changed, 114 insertions, 0 deletions
diff --git a/spaghetti-monster/fsm-eeprom.c b/spaghetti-monster/fsm-eeprom.c
new file mode 100644
index 0000000..bb63c7e
--- /dev/null
+++ b/spaghetti-monster/fsm-eeprom.c
@@ -0,0 +1,114 @@
+/*
+ * fsm-eeprom.c: EEPROM API for SpaghettiMonster.
+ *
+ * Copyright (C) 2017 Selene ToyKeeper
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef FSM_EEPROM_C
+#define FSM_EEPROM_C
+
+#include "fsm-eeprom.h"
+
+#if EEPROM_BYTES > 0
+#ifdef EEPROM_OVERRIDE
+uint8_t *eeprom;
+#else
+uint8_t eeprom[EEPROM_BYTES];
+#endif
+
+uint8_t load_eeprom() {
+    cli();
+    // check if eeprom has been initialized; abort if it hasn't
+    uint8_t marker = eeprom_read_byte((uint8_t *)EEP_START);
+    if (marker != EEP_MARKER) { sei(); return 0; }
+
+    // load the actual data
+    for(uint8_t i=0; i<EEPROM_BYTES; i++) {
+        eeprom[i] = eeprom_read_byte((uint8_t *)(EEP_START+1+i));
+    }
+    sei();
+    return 1;
+}
+
+void save_eeprom() {
+    cli();
+
+    // save the actual data
+    for(uint8_t i=0; i<EEPROM_BYTES; i++) {
+        eeprom_update_byte((uint8_t *)(EEP_START+1+i), eeprom[i]);
+    }
+
+    // save the marker last, to indicate the transaction is complete
+    eeprom_update_byte((uint8_t *)EEP_START, EEP_MARKER);
+    sei();
+}
+#endif
+
+#if EEPROM_WL_BYTES > 0
+uint8_t eeprom_wl[EEPROM_WL_BYTES];
+EEP_OFFSET_T eep_wl_prev_offset;
+
+uint8_t load_eeprom_wl() {
+    cli();
+    // check if eeprom has been initialized; abort if it hasn't
+    uint8_t found = 0;
+    EEP_OFFSET_T offset;
+    for(offset = 0;
+        offset < EEP_WL_SIZE - EEPROM_WL_BYTES - 1;
+        offset += (EEPROM_WL_BYTES + 1)) {
+        if (eeprom_read_byte((uint8_t *)offset) == EEP_MARKER) {
+            found = 1;
+            eep_wl_prev_offset = offset;
+            break;
+        }
+    }
+
+    if (found) {
+        // load the actual data
+        for(uint8_t i=0; i<EEPROM_WL_BYTES; i++) {
+            eeprom_wl[i] = eeprom_read_byte((uint8_t *)(offset+1+i));
+        }
+    }
+    sei();
+    return found;
+}
+
+void save_eeprom_wl() {
+    cli();
+    // erase old state
+    EEP_OFFSET_T offset = eep_wl_prev_offset;
+    for (uint8_t i = 0; i < EEPROM_WL_BYTES+1; i ++) {
+        eeprom_update_byte((uint8_t *)offset+i, 0xFF);
+    }
+
+    // save new state
+    offset += EEPROM_WL_BYTES+1;
+    if (offset > EEP_WL_SIZE-EEPROM_WL_BYTES-1) offset = 0;
+    eep_wl_prev_offset = offset;
+    // marker byte
+    // FIXME: write the marker last, to signal completed transaction
+    eeprom_update_byte((uint8_t *)offset, EEP_MARKER);
+    offset ++;
+    // user data
+    for(uint8_t i=0; i<EEPROM_WL_BYTES; i++, offset++) {
+        eeprom_update_byte((uint8_t *)(offset), eeprom_wl[i]);
+    }
+    sei();
+}
+#endif
+
+
+#endif