add checksum verifications

6 years ago · fcdb66d53a
parent ea97235c2c
commit fcdb66d53a
1 changed files with 10 additions and 3 deletions
--- a/main.c
+++ b/main.c
@ -59,6 +59,16 @@ void main()
 	while (1) {
        last_signal = signal;
        signal = ow_reset(OW_PIN);
+
+        if (signal) {
+            ow_write(OW_PIN, 0x33);
+            ow_read_arr(OW_PIN, addr, 8);
+            // check if valid
+            if (addr[0] == 0x00 || (crc8(addr, 7) != addr[7])) {
+                signal = false;
+            }
+        }
+
        if (!signal) {
            if (last_signal) {
                lcd_clear();
@ -70,9 +80,6 @@ void main()
                lcd_clear();
            }

-            ow_write(OW_PIN, 0x33);
-            ow_read_arr(OW_PIN, addr, 8);
-
            // Show chip type
            switch (addr[0]) {
                case 0x10: