Initial commit of source code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/avr/pgm.h

@@ -0,0 +1,25 @@
+#ifndef __AVR_PGM_H
+#define __AVR_PGM_H
+// This header provides the avr/pgmspace.h definitions for "PROGMEM"
+// on AVR platforms.
+
+#include <avr/pgmspace.h>
+
+#define READP(VAR) ({                                                   \
+    _Pragma("GCC diagnostic push");                                     \
+    _Pragma("GCC diagnostic ignored \"-Wint-to-pointer-cast\"");        \
+    typeof(VAR) __val =                                                 \
+        __builtin_choose_expr(sizeof(VAR) == 1,                         \
+            (typeof(VAR))pgm_read_byte(&(VAR)),                         \
+        __builtin_choose_expr(sizeof(VAR) == 2,                         \
+            (typeof(VAR))pgm_read_word(&(VAR)),                         \
+        __builtin_choose_expr(sizeof(VAR) == 4,                         \
+            (typeof(VAR))pgm_read_dword(&(VAR)),                        \
+        __force_link_error__unknown_type)));                            \
+    _Pragma("GCC diagnostic pop");                                      \
+    __val;                                                              \
+    })
+
+extern void __force_link_error__unknown_type(void);
+
+#endif // pgm.h