Use constants for the addresses.

Author: thejpster

src/main.rs

@@ -10,10 +10,15 @@ use self::algo::*;
 fn find_func<T>(tag: [u8; 2]) -> T {
     let tag = u16::from_le_bytes(tag) as u32;
     type RomTableLookupFn = unsafe extern "C" fn(table: *const u16, code: u32) -> usize;
+    /// This location in flash holds a 16-bit truncated pointer for the ROM lookup function
+    const ROM_TABLE_LOOKUP_PTR: *const u16 = 0x0000_0018 as _;
+    /// This location in flash holds a 16-bit truncated pointer for the ROM function table
+    /// (there's also a ROM data table which we don't need)
+    const FUNC_TABLE: *const u16 = 0x0000_0014 as _;
     unsafe {
-        let lookup_func = core::ptr::read(0x0000_0018 as *const u16) as usize;
+        let lookup_func = ROM_TABLE_LOOKUP_PTR.read() as usize;
         let lookup_func: RomTableLookupFn = core::mem::transmute(lookup_func);
-        let table = core::ptr::read(0x0000_00014 as *const u16) as usize;
+        let table = FUNC_TABLE.read() as usize;
         let result = lookup_func(table as *const u16, tag);
         if result == 0 {
             panic!("Function not found");