Adds hex output to serial

src/serial.c

@@ -32,3 +32,18 @@ void serial_writestring(char* s) {
         s++;
     }
 }
+
+const char* hexchars = "0123456789abcdef";
+void serial_hexword(uint32_t x) {
+    for (int i = 8; i != 0; i--) {
+        serial_writechar(hexchars[x>>i*4&0xf]);
+    }
+}
+
+void serial_hexstring(void* s, uint32_t n) {
+    char* d = (char*)s;
+    for (uint32_t i = 0; i < n; i++) {
+        serial_writechar(hexchars[(d[i]>>4)&0xf]);
+        serial_writechar(hexchars[d[i]&0xf]);
+    }
+}

src/serial.h

@@ -2,7 +2,11 @@
   serial.h contains headers for the serial interaction functions
 */
 
+#ifndef _SERIAL_INC
+#define _SERIAL_INC
+
 #include "asm.h"
+#include <stdint.h>
 
 // Initilizes the first serial port
 void serial_init();
@@ -15,3 +19,9 @@ void serial_writechar(char a);
 
 // Write a null terminated string to serial
 void serial_writestring(char* s);
+
+// Function to write a 4 byte word toserial in hex
+void serial_hexword(uint32_t x);
+void serial_hexstring(void* s, uint32_t n);
+
+#endif