Implement a toggleable keyboard on the lower screen

1 files changed, 16 insertions, 0 deletions

diff --git a/arm9/source/types/circbuf.h b/arm9/source/types/circbuf.h
new file mode 100644
index 0000000..305f8bf
--- /dev/null
+++ b/arm9/source/types/circbuf.h
@@ -0,0 +1,16 @@
+#include <nds.h>
+
+#ifndef CIRCBUF_H_
+    #define CIRCBUF_H_
+
+    typedef struct {
+        u8 mem[256];
+        u8 front;      // start of buffer, read from here until back
+        u8 back;       // end of buffer, write past here until front
+    } CircBuf;
+
+    u8 cb_read_byte(CircBuf *buf);
+    void cb_write_byte(CircBuf *buf, u8 byte);
+    void cb_clear(CircBuf *buf);
+
+#endif