feat: add packet struct

common/include/message.h

@@ -15,7 +15,7 @@ typedef s64 int64_t;
 #include <stdint.h>
 #endif
 
-#define MAX_MESSAGE_DATA_SIZE 4096
+#define MAX_MESSAGE_DATA_SIZE 8
 
 enum message_data_type {
   INT8,

kernel/kmod.c

@@ -35,6 +35,11 @@ static atomic_t wake_counter = ATOMIC_INIT(0);
 
 static int slot = 0;
 
+typedef struct packet {
+    message_t data;
+    uint32_t crc;
+} packet_t;
+
 static int device_open(struct inode *inode, struct file *file)
 {
     return 0;
@@ -110,10 +115,12 @@ static int timed_thread_fn(void *args) {
         atomic_dec(&wake_counter);
 
         if (slot == 0) {
-            uint32_t crc = calculate_crc32(&message, sizeof(message));
+            packet_t packet;
+
+            packet.data = *message;
+            packet.crc = calculate_crc32(&packet.data, sizeof(&packet.data));
 
-            send_data(&message, sizeof(message));
-            send_data(&crc, sizeof(uint32_t));
+            send_data(&packet, sizeof(packet));
         }
 
         slot = (slot + 1) % SLOTS;