main.c

这是一个关于在ＧＢＡ上显示文字的程序

// 头文件
// 载入Gslib for GBA 库
#include <GsGBA.h>

void VBLserver();		// 主程序框架(1/60秒)
void SendOK();
u16 i,j;

#define SCCNT_L (u16 *) 0x04000128
#define SCCNT_H (u16 *) 0x0400012a
#define RCNT	(u16 *) 0x04000134
#define IME	(u16 *) 0x04000208
#define IE	(u16 *) 0x04000200

// 中断向量表
const IntrFuncp IntrTable[14] =
{
	VBLserver,	// V Blank interrupt
	dummy,		// H Blank interrupt
	dummy,		// V Counter interrupt
	dummy,		// Timer 0 interrupt
	dummy,		// Timer 1 interrupt
	dummy,		// Timer 2 interrupt
	dummy,		// Timer 3 interrupt
	SendOK,		// Serial communication interrupt
	dummy,		// DMA 0 interrupt
	dummy,		// DMA 1 interrupt
	dummy,		// DMA 2 interrupt
	dummy,		// DMA 3 interrupt
	dummy,		// Key interrupt
	dummy,		// Cassette interrupt
};


// 主函数
int AgbMain()
{
	// 设置BG模式为4
	GsSetMode(MODE_4 |DISP_OBJ_CHAR_2D_MAP);

	BGPaletteMem[1]=0xffff;

	// 通讯初始化
	*RCNT=0x8000;		//0100 0000 1010 0000
	*SCCNT_L=0x0000;	//0111 1100 1000 0011

	while(1)
	{
		KeyRead();
		if (Trg & A_BUTTON)
		{
			// UART通讯初始化
			*RCNT=0x0000;		//0000 0000 0000 0000
			*SCCNT_L=0x7ca3;	//0111 1100 1010 0011

			// 允许相关中断请求
			GsOpenIRQ();
			*IE=0x0081;		//0000 0000 1000 0001
		}
	}
	return 0;
}

void VBLserver()
{
	// 数据限幅
	if (i==256)	i=0;

	// 发送数据
	*SCCNT_H=(*SCCNT_H & 0xff00)+i;

	// 观察是否进入中断
	i++;
	if (i%2)	GsTextOut(140,60,"A",1);
	else		GsTextOut(140,60,"B",1);

	// 显示寄存器位状态
	j=*SCCNT_L;
	if (j&0x8000)	GsTextOut(10,20,"1",1);
	else		GsTextOut(10,20,"0",1);
	if (j&0x4000)	GsTextOut(20,20,"1",1);
	else		GsTextOut(20,20,"0",1);
	if (j&0x2000)	GsTextOut(30,20,"1",1);
	else		GsTextOut(30,20,"0",1);
	if (j&0x1000)	GsTextOut(40,20,"1",1);
	else		GsTextOut(40,20,"0",1);
	if (j&0x0800)	GsTextOut(50,20,"1",1);
	else		GsTextOut(50,20,"0",1);
	if (j&0x0400)	GsTextOut(60,20,"1",1);
	else		GsTextOut(60,20,"0",1);
	if (j&0x0200)	GsTextOut(70,20,"1",1);
	else		GsTextOut(70,20,"0",1);
	if (j&0x0100)	GsTextOut(80,20,"1",1);
	else		GsTextOut(80,20,"0",1);
	if (j&0x0080)	GsTextOut(90,20,"1",1);
	else		GsTextOut(90,20,"0",1);
	if (j&0x0040)	GsTextOut(100,20,"1",1);
	else		GsTextOut(100,20,"0",1);
	if (j&0x0020)	GsTextOut(110,20,"1",1);
	else		GsTextOut(110,20,"0",1);
	if (j&0x0010)	GsTextOut(120,20,"1",1);
	else		GsTextOut(120,20,"0",1);
	if (j&0x0008)	GsTextOut(130,20,"1",1);
	else		GsTextOut(130,20,"0",1);
	if (j&0x0004)	GsTextOut(140,20,"1",1);
	else		GsTextOut(140,20,"0",1);
	if (j&0x0002)	GsTextOut(150,20,"1",1);
	else		GsTextOut(150,20,"0",1);
	if (j&0x0001)	GsTextOut(160,20,"1",1);
	else		GsTextOut(160,20,"0",1);

	GsWaitSync();
	GsFlip();
}

void SendOK()
{
	// 观察是否进入中断
	if (i%2)	GsTextOut(20,60,"1",1);
	else		GsTextOut(20,60,"2",1);

	GsWaitSync();
	GsFlip();
}