isr.asm

一个数字滤波的程序

.INCLUDE hardware.inc				
.EXTERNAL	F_Key_Scan;
.external _h;
.external _x;
.external _Filter_LED_Show
.external _temp1,_temp2,_mytemp;
.external _feeddog
.TEXT
//键盘扫描与了LED显示中断
.PUBLIC _IRQ6;
_IRQ6:        
   	PUSH r1 to [sp];
	r1=0x0001;
	TEST r1,[P_INT_Ctrl];
	JNZ  _IRQ6_TMB2;
	r1=0x0002;
	[P_INT_Clear]=r1;
//show() start
	call _Filter_LED_Show
	call _feeddog;
//show() end
	POP r1 FROM [sp];
    RETI;  
//键盘扫描       
_IRQ6_TMB2:
	[P_INT_Clear]=r1;
	CALL	F_Key_Scan;
END_INT:
	POP r1 FROM [sp];
    RETI;  
    
.public _FIQ
_FIQ:
	FIR_MOV ON;
_ad:
	push r1,r5 to [sp];
	r2=[P_ADC_Ctrl];
	test r2,0x8000;
	jz _ad;
	r3=[P_ADC_MUX_Data];
	r3=r3 lsr 4;
	r3=r3 lsr 2;
	r2=_h;
	r1=_x;	
	[r1]=r3;
	MR=[R1]*[R2],ss,16;
	[_temp1]=r3;
	[_temp2]=r4;
	//r4^=0xffff;
//	r3^=0xffff;
	r3=r3 lsl 4;
	r4=r4 rol 2;
	r4=r4 lsl 1;
//	[P_IOB_Data]=r4;
	[P_DAC2]=r4;
	r1=0x2000;
	[P_INT_Clear]=r1;
	call _mytemp
	pop r1,r5 from [sp];
RETI;