Sinewave_generator

диагностика промышленной электроники

                              ; **************************************************************
                              ; * Produces a sinewave on a R/2R-network connected to PORTD   *
                              ; * (C)2005 by avr-asm-tutorial.net                            *
                              ; **************************************************************
                              ;
.INCLUDE "8515def.inc"
                              ;
                              ; Register definitions
                              ;
.DEF rmp = R16                ; Multipurpose register
                              ;
                              ; Start of program source code
                              ;
 ldi rmp,0xFF                 ; Set all pins of port D to be output
 out DDRD,rmp 
 ldi ZH,HIGH(2*SineTable)     ; Point Z to Table in flash
 ldi ZL,LOW(2*SineTable)
 clr rmp

loop1:
       nop
       nop
       nop

loop2:
       lpm                    ; Read from table
       out PORTD,R0           ; Write value to port D
       adiw ZL,1              ; point to next value
       dec rmp                ; End of Table reached
       brne loop1
       ldi ZH,HIGH(2*SineTable); Point Z to Table in flash
       ldi ZL,LOW(2*SineTable)
       rjmp loop2
                              ;
                              ; End of source code
                              ;
                              ; Include sinewave table
                              ;
                              ;
                              ; Sinewave table for 8 bit D/A
                              ; VCC=5.000V, uLow=0.000V, uHigh=2.500V
                              ; (generated by sinewave.pas)
                              ;
Sinetable:
.DB 64,65,67,68,70,72,73,75
.DB 76,78,79,81,82,84,85,87
.DB 88,90,91,92,94,95,97,98
.DB 99,100,102,103,104,105,107,108
.DB 109,110,111,112,113,114,115,116
.DB 117,118,118,119,120,121,121,122
.DB 123,123,124,124,125,125,126,126
.DB 126,127,127,127,127,127,127,127
.DB 128,127,127,127,127,127,127,127
.DB 126,126,126,125,125,124,124,123
.DB 123,122,121,121,120,119,118,118
.DB 117,116,115,114,113,112,111,110
.DB 109,108,107,105,104,103,102,100
.DB 99,98,97,95,94,92,91,90
.DB 88,87,85,84,82,81,79,78
.DB 76,75,73,72,70,68,67,65
.DB 64,62,61,59,58,56,54,53
.DB 51,50,48,47,45,44,42,41
.DB 39,38,36,35,34,32,31,30
.DB 28,27,26,25,23,22,21,20
.DB 19,18,17,15,14,13,13,12
.DB 11,10,9,8,8,7,6,5
.DB 5,4,4,3,3,2,2,2
.DB 1,1,1,0,0,0,0,0
.DB 0,0,0,0,0,0,1,1
.DB 1,2,2,2,3,3,4,4
.DB 5,5,6,7,8,8,9,10
.DB 11,12,13,13,14,15,17,18
.DB 19,20,21,22,23,25,26,27
.DB 28,30,31,32,34,35,36,38
.DB 39,41,42,44,45,47,48,50
.DB 51,53,54,56,58,59,61,62
                              ;
                              ; End of program
                              ;