starting to separate platform-specific code to facilitate a PC build

[gbajam22] / src / gba / timer.h

diff --git a/src/gba/timer.h b/src/gba/timer.h
new file mode 100644 (file)
index 0000000..3daed47
--- /dev/null
+++ b/src/gba/timer.h
@@ -0,0 +1,32 @@
+#ifndef TIMER_H_
+#define TIMER_H_
+
+#include "gbaregs.h"
+
+#define enable_timer(x) \
+       do { REG_TMCNT_H(x) |= TMCNT_EN; } while(0)
+
+#define disable_timer(x) \
+       do { REG_TMCNT_H(x) &= ~TMCNT_EN; } while(0)
+
+volatile unsigned long timer_msec;
+
+void init_timer(int tm, unsigned long rate_hz, void (*intr)(void));
+
+void reset_msec_timer(void);
+
+void delay(unsigned long ms);
+
+#ifdef __thumb__
+#define udelay(x)  asm volatile ( \
+       "0: sub %0, %0, #1\n\t" \
+       "bne 0b\n\t" \
+       :: "r"(x) : "cc")
+#else
+#define udelay(x)  asm volatile ( \
+       "0: subs %0, %0, #1\n\t" \
+       "bne 0b\n\t" \
+       :: "r"(x) : "cc")
+#endif
+
+#endif /* TIMER_H_ */