From ea46d05aed0343c20d8fdfaa0e67d54d51e8e2a0 Mon Sep 17 00:00:00 2001
From: "John Wilbert M. Villamor" <lameguy64@gmail.com>
Date: Fri, 22 Nov 2019 09:11:12 +0800
Subject: Added long awaited CD-ROM library and loads of fixes, see changelog
 for details

---
 examples/timer/main.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 examples/timer/main.c

(limited to 'examples/timer/main.c')

diff --git a/examples/timer/main.c b/examples/timer/main.c
new file mode 100644
index 0000000..7d9f7b3
--- /dev/null
+++ b/examples/timer/main.c
@@ -0,0 +1,154 @@
+#include <stdio.h>
+#include <psxgpu.h>
+#include <psxapi.h>
+#include <psxetc.h>
+
+/* OT and Packet Buffer sizes */
+#define OT_LEN			256
+#define PACKET_LEN		1024
+
+/* Screen resolution */
+#define SCREEN_XRES		320
+#define SCREEN_YRES		240
+
+/* Screen center position */
+#define CENTERX			SCREEN_XRES>>1
+#define CENTERY			SCREEN_YRES>>1
+
+
+/* Double buffer structure */
+typedef struct {
+	DISPENV	disp;			/* Display environment */
+	DRAWENV	draw;			/* Drawing environment */
+} DB;
+
+/* Double buffer variables */
+DB		db[2];
+int		db_active = 0;
+
+
+/* Function declarations */
+void init();
+void display();
+
+
+volatile int timer_calls = 0;
+volatile short *timer2_ctrl = (short*)0x1F801124;
+void timer_func()
+{
+	timer_calls++;
+}
+
+volatile int vsync_count = 0;
+volatile int tick_count = 0;
+volatile int tick_value = 0;
+
+void vsync_func()
+{
+	vsync_count++;
+	if( vsync_count > 60 )
+	{
+		tick_value = timer_calls-tick_count;
+		tick_count = timer_calls;
+		vsync_count = 0;
+	}
+}
+
+/* Main function */
+int main() {
+	
+	int counter;
+	
+	/* Init graphics and GTE */
+	init();
+	
+	
+	EnterCriticalSection();
+	//SetRCnt(RCntCNT2, 0xF040, RCntMdINTR);
+	
+	// NTSC clock base
+	counter = 4304000/560;
+	
+	// PAL clock base
+	//counter = 5163000/560;
+	
+	SetRCnt(RCntCNT2, counter, RCntMdINTR);
+	*timer2_ctrl = 0x1E58;
+	InterruptCallback(6, timer_func);
+	StartRCnt(RCntCNT2);
+	ChangeClearRCnt(2, 0);
+	ExitCriticalSection();
+	
+	VSyncCallback(vsync_func);
+	
+	/* Main loop */
+	while( 1 ) {
+		
+		FntPrint(-1, "TIMER COUNT=%d\n", timer_calls);
+		FntPrint(-1, "TICKS/SEC=%d\n", tick_value);
+		
+		/* Swap buffers and draw text */
+		display();
+		
+	}
+	
+	return 0;
+	
+}
+
+void init() {
+
+	/* Reset the GPU, also installs a VSync event handler */
+	ResetGraph( 0 );
+	//SetVideoMode(MODE_PAL);
+	
+	/* Set display and draw environment areas */
+	/* (display and draw areas must be separate, otherwise hello flicker) */
+	SetDefDispEnv( &db[0].disp, 0, 0, SCREEN_XRES, SCREEN_YRES );
+	SetDefDrawEnv( &db[0].draw, SCREEN_XRES, 0, SCREEN_XRES, SCREEN_YRES );
+	
+	/* Enable draw area clear and dither processing */
+	setRGB0( &db[0].draw, 63, 0, 127 );
+	db[0].draw.isbg = 1;
+	db[0].draw.dtd = 1;
+	
+	
+	/* Define the second set of display/draw environments */
+	SetDefDispEnv( &db[1].disp, SCREEN_XRES, 0, SCREEN_XRES, SCREEN_YRES );
+	SetDefDrawEnv( &db[1].draw, 0, 0, SCREEN_XRES, SCREEN_YRES );
+	
+	//db[0].disp.screen.y = 24;
+	//db[1].disp.screen.y = 24;
+	
+	setRGB0( &db[1].draw, 63, 0, 127 );
+	db[1].draw.isbg = 1;
+	db[1].draw.dtd = 1;
+	
+	
+	/* Apply the drawing environment of the first double buffer */
+	PutDrawEnv( &db[0].draw );
+	
+	FntLoad(960, 0);
+	FntOpen(0, 8, 320, 216, 0, 100);
+	
+}
+
+void display() {
+	
+	FntFlush(-1);
+	
+	/* Wait for GPU to finish drawing and vertical retrace */
+	DrawSync( 0 );
+	VSync( 0 );
+	
+	/* Swap buffers */
+	db_active ^= 1;
+	
+	/* Apply display/drawing environments */
+	PutDrawEnv( &db[db_active].draw );
+	PutDispEnv( &db[db_active].disp );
+	
+	/* Enable display */
+	SetDispMask( 1 );
+	
+}
\ No newline at end of file
-- 
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