From 0d9978228b9226d16ba8272a03dd7e6c9ad83b3d Mon Sep 17 00:00:00 2001 From: Ben Bridle Date: Mon, 16 Dec 2024 14:52:54 +1300 Subject: Implement a toggleable keyboard on the lower screen --- arm9/source/types/circbuf.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 arm9/source/types/circbuf.c (limited to 'arm9/source/types/circbuf.c') diff --git a/arm9/source/types/circbuf.c b/arm9/source/types/circbuf.c new file mode 100644 index 0000000..532a5a0 --- /dev/null +++ b/arm9/source/types/circbuf.c @@ -0,0 +1,20 @@ +#include "circbuf.h" + +u8 cb_read_byte(CircBuf *buf) { + if (buf->front != buf->back) { + return buf->mem[buf->front++]; + } else { + return 0; + } +} + +void cb_write_byte(CircBuf *buf, u8 byte) { + if (((buf->back+1)&0xff) != buf->front) { + buf->mem[buf->back++] = byte; + } +} + +void cb_clear(CircBuf *buf) { + buf->front = 0; + buf->back = 0; +} -- cgit v1.2.3-70-g09d2