use eeprom for pin

1 files changed, 13 insertions, 3 deletions

diff --git a/kbc.c b/kbc.c
index 6a04e4a..81ba569 100644
--- a/kbc.c
+++ b/kbc.c
@@ -5,6 +5,7 @@
 #include <avr/interrupt.h>
 #include <avr/sleep.h>
 #include <avr/pgmspace.h>
+#include <avr/eeprom.h>
 #include <util/delay.h>
 
 #ifndef PIN
@@ -331,7 +332,7 @@ static uint8_t cntr = 0;
 static uint8_t error;
 #endif
 
-static const char passwd[sizeof(PIN) - 1] = PIN;
+static const EEMEM char passwd[sizeof(PIN) - 1] = PIN;
 static char code[sizeof(PIN)];
 
 static void state_enter(void)
@@ -543,17 +544,26 @@ static void handle_keypress(uint8_t data)
         unlock = ascii == ENT || data == NUMPAD_ENTER;
 
         if (lock || unlock) {
+                uint8_t eebyte, pos, ok = 1;
+
                 /* passwd:  a  b  c  d
                  * code:   \0  a  b  c  d
                  */
+
+                if (code[0])
+                        ok = 0;
 #ifdef KILLSWITCH
-                if (code[0] || !memcmp("9164", code + 1, 4)) {
+                if (!memcmp("9164", code + 1, 4)) {
                         error = 0;
                         nextstate = STATE_ERROR;
                         return;
                 }
 #endif
-                if (code[0] || memcmp(passwd, code + 1, sizeof(passwd))) {
+                for (pos = 1; pos < sizeof(code); pos++)
+                        if (code[pos] != eeprom_read_byte(passwd + pos - 1))
+                                ok = 0;
+
+                if (!ok) {
                         dbg_wr(0x20);
                         nextstate = STATE_REJECT;
                 } else {