system.asm

一个数字滤波的程序

.include hardware.inc

.code
.public _ini_sys
_ini_sys:.proc
	r1=0xff00;
	[P_IOA_Dir]=r1;
	[P_IOA_Attrib]=r1;
	r1=0;
	[P_IOA_Data]=r1;
	r1 = 0xf0FF;      
    [P_IOB_Attrib] = r1;    
    [P_IOB_Dir] = r1;
    r1=0xf000;
    [P_IOB_Data] = r1;
    r1=0xf0;
	[P_SystemClock]=r1;
	retf;
.endp

.public _ini_INT
_ini_INT:.proc
	INT OFF;
	 r1 = 0x0000;
     [P_TimeBase_Setup]=r1        // TMB2选择128Hz //TMB1选择8Hz,但不起作用 
     r1=0x0030;
	 [P_TimerA_Ctrl]=r1;
	 r1=0xfe80;
	 [P_TimerA_Data]=r1;
     r1=C_IRQ6_TMB1;
     r1|=C_IRQ6_TMB2;
     r1|=C_FIQ_TMA;
     [P_INT_Ctrl]=r1;
	 INT FIQ,IRQ;
	retf;
.endp

.public _ini_ADC
_ini_ADC:.proc
	r1=1;
	[P_ADC_Ctrl]=r1;
	r1=1;	
	[P_ADC_MUX_Ctrl]=r1;	
    retf;
.endp

.public _ini_DAC
_ini_DAC:.proc
	r1=0;			
	[P_DAC_Ctrl]=r1;
	retf;
.endp

.public _feeddog
_feeddog:.proc
	push r1 to [sp];
	r1=1;
	[0x7012]=r1;
	pop r1 from [sp];
retf;
.endp