1 files changed, 16 insertions, 4 deletions
diff --git a/fw/types.h b/fw/types.h
index ccdf0ae..7532c6b 100644
--- a/fw/types.h
+++ b/fw/types.h
@@ -13,6 +13,7 @@ typedef enum {
 } Status;
 
 typedef uint8_t U8;
+typedef int8_t I8;
 
 typedef struct {
 	U8 hi, lo;
@@ -21,8 +22,19 @@ typedef struct {
 // Little-endian 32-bit unsigned integer.
 typedef U8 U32[4];
 
-// *a = *a+b
-void addU16(U16 *a, U8 b);
+// a + b
+U16 addU16(U16 a, U16 b);
 
-// *a = *a<<b
-void lshiftU16(U16 *a, U8 b);
+// a + b
+U16 addU16U8(U16 a, U8 b);
+
+// a << b
+U16 lshiftU16(U16 a, U8 b);
+
+// a >> b
+U16 rshiftU16(U16 a, U8 b);
+
+// -1 if a < b
+// 0 if a == b
+// +1 if a > b
+I8 cmpU16(U16 a, U16 b);