ji.asm

基于凌阳单片机的16位FIR数字低通滤波器源码

.DEFINE P_INT_Ctrl          0x7010;       
.DEFINE P_INT_Clear         0x7011; 
.DEFINE P_ADC_MUX_Ctrl      0x702B;
.DEFINE P_ADC_MUX_Data      0x702C;
.DEFINE P_SYSTEMCLOCK       0x7013;
.DEFINE P_TimerA_Data       0x700A;       
.DEFINE P_TimerA_Ctrl       0x700B;
.DEFINE P_ADC_Ctrl          0x7015;  
.DEFINE P_DAC_Ctrl	        0x702A;	
.DEFINE P_DAC2              0x7016;        	      	
.DEFINE P_DAC1	            0x7017;
.DEFINE P_Watchdog_Clear    0x7012;  

.isram
x0: .dw 1;
x1: .dw 1;
x2: .dw 1;
x3: .dw 1;
x4: .dw 1;
x5: .dw 1;
x6: .dw 1;
x7: .dw 1;
x8: .dw 1;
x9: .dw 1;
x10: .dw 1;
x11: .dw 1;
x12: .dw 1;
x13: .dw 1;
x14: .dw 1;
x15: .dw 1;



.DATA
h0:  .dw  1;
h1:  .dw  3;
h2:  .dw  5; 
h3:  .dw  7; 
h4:  .dw  9; 
h5:  .dw  11; 
h6:  .dw  12; 
h7:  .dw  12;
h8:  .dw  12;
h9:  .dw  12;
h10: .dw  11;
h11: .dw  9;
h12: .dw  7;
h13: .dw  5;
h14: .dw  3;
h15: .dw  1;



.code
.public _main
_main:
int off;              //关断AHK进l

r1 = 0x00f0;          //Fosc=49.152MHz,CPUCLOCK=Fosc
[P_SYSTEMCLOCK] = r1;

r1 = 0x0030;          //clckA选择Fosc/2;ClockB
[P_TimerA_Ctrl] = r1;
r1 = 0xfd00;
[P_TimerA_Data] = r1; //32kHz断频

r1 = 0;
[P_DAC_Ctrl] = r1;    //将DAR锁sDACF

r1 = 0x1;
[P_ADC_Ctrl] = r1;    //yunxu数模转换
r1 = 0x1;
[P_ADC_MUX_Ctrl] = r1; //选择Line_IN1输J

r1 = 0x2000;
[P_INT_Ctrl] = r1; //许timeAFIQ断

fiq on;                //开断
 loop:
 nop;
 r1 = 0x0001;                      
 [P_Watchdog_Clear ] = r1;  //清看门狗
goto loop;  
     
.text
.public _FIQ
_FIQ:
        fir_mov on
        r1=x0;                        //*
    	r3=[P_ADC_MUX_Data];             //get ad data*
       	r3=r3 lsr 4;                     //AD is plus
    	r3=r3 lsr 2;
    	[r1]=r3;
    	
mr = [r1]*[r2],us,16   //FIR滤i运
r4 = r4 lsr 4;
r3 = r3 ror 4;
r4 = r4 lsr 4;
r3 = r3 ror 3;        //计结G16
r3=r3 lsl 2
r3=r3 lsl 4
[P_DAC1] = r3;         //DA转换
r1 = 0x2000;
[P_INT_Clear] =r1; 
r1 = x0; 
r2 = h0; 
reti;