adidas improvements

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+    "files.associations": {
+        "decode.h": "c"
+    },
+    "cmake.sourceDirectory": "/home/rens/files/T2/HC/holyc-lang/src"
+}

C/C5 and C6 Adidas/shared/channel.c

@@ -1,4 +1,10 @@
 #include "channel.h"
-// add here includes, if needed
-
+#include <time.h>
 // add here your implementation
+void channel_init(){
+
+}
+
+uint8_t channel_change_one_random_bit(uint8_t value){
+    
+}

C/C5 and C6 Adidas/shared/decode.c

@@ -1,4 +1,45 @@
 #include "decode.h"
-// add here includes, if needed
+#include "bit_stuff.h"
 
-// add here your implementation
+uint8_t decode_combine_nibbles(uint8_t high, uint8_t low){
+    uint8_t byte;
+    uint8_t high_nibble;
+    uint8_t low_nibble;
+    decode_byte(high,high_nibble);
+    decode_byte(low,low_nibble);
+    combine_nibles_to_byte(high_nibble, low_nibble, byte);
+    return byte;
+}
+
+void decode_byte(uint8_t in, uint8_t* nibble){
+    uint8_t p0 = (in >> 0) & 0x01;
+    uint8_t p1 = (in >> 1) & 0x01;
+    uint8_t p2 = (in >> 2) & 0x01;
+    uint8_t d0 = (in >> 3) & 0x01;
+    uint8_t d1 = (in >> 4) & 0x01;
+    uint8_t d2 = (in >> 5) & 0x01;
+    uint8_t d3 = (in >> 6) & 0x01;
+    uint8_t MSB = (in >> 7) & 0x01;
+    
+    // Check parity bits
+    uint8_t error = 0;
+    if ((p0 ^ d0 ^ d1 ^ d2) != 0) error |= 0x01;  // Error in p0 group
+    if ((p1 ^ d0 ^ d1 ^ d3) != 0) error |= 0x02;  // Error in p1 group
+    if ((p2 ^ d0 ^ d2 ^ d3) != 0) error |= 0x04;  // Error in p2 group
+
+    if (MSB == 0 && error != 0) {
+        switch(error) {
+            case 0x07: d0 ^= 1; break; // Error in d0 0x7 = 0111
+            case 0x03: d1 ^= 1; break; // Error in d1 0x3 = 0011
+            case 0x05: d2 ^= 1; break; // Error in d2 0x5 = 0101
+            case 0x06: d3 ^= 1; break; // Error in d3 0x6 = 0110
+
+            case 0x01: p0 ^= 1; break; // Error in p0 0x1 = 0001
+            case 0x02: p1 ^= 1; break; // Error in p1 0x2 = 0010
+            case 0x04: p2 ^= 1; break; // Error in p2 0x4 = 0100
+        }
+    } else if (MSB == 1) MSB ^= 1; // If MSB is 1, flip it
+
+    // create nibble from data bits
+    *nibble = (d3 << 3) | (d2 << 2) | (d1 << 1) | d0;
+}

C/C5 and C6 Adidas/shared/parity.c

@@ -8,7 +8,7 @@ void calculate_parity_bits(uint8_t nibble, uint8_t* p0, uint8_t* p1, uint8_t* p2
     uint8_t d3 = (nibble >> 3) & 1;
 
     // Parity bits as per assignment examples
-    *p0 = d0 ^ d1 ^ d2;  // Circle with d0,d1,d2
-    *p1 = d0 ^ d1 ^ d3;  // Circle with d0,d1,d3
-    *p2 = d0 ^ d2 ^ d3;  // Circle with d0,d2,d3
+    *p0 = d0 ^ d1 ^ d2;
+    *p1 = d0 ^ d1 ^ d3;
+    *p2 = d0 ^ d2 ^ d3;
 }