; main loop
;
;	r28,r29,r30,r31 is the phase accumulator
;  	r24,r25,r26,r27 is the adder value determining frequency
;
; 	add value to accumulator
;	load byte from current table in RAM
;	output byte to port
;	repeat 

		; clear accumulator 
        	clr     r27             ; zero < 150 kHz , 1 max
	    	clr     r28
		clr 	r29				
		clr	r30	
        	ldi     r31 ,8       	; base of sine table (400 *2)
		  
		add	r28,r24			
LOOP1: 		adc	r29,r25		; 1
		adc	r30,r26		; 1
		adc     r31,r27         ; 1 
        	cbr     r31,4		; 1 limit banks to 0..3
      		lpm     r0,z		; 3
		out	PORTD,r0	; 1
		add	r28,r24		; 1
		adc	r29,r25		; 1
		adc	r30,r26	 	; 1
		adc     r31,r27         ; 1
	    	cbr     r31,4		; 1 limit banks to 0..3
      		lpm     r0,z		; 3
		add	r28,r24		; 1 timeing
		out	PORTD,r0	; 1
		rjmp	LOOP1		; 2 => 20 / 2 = 10 cycles


;******************************************************************************
; data tables
;******************************************************************************

	; force table to begin at 256 byte boundary

	.org 0x400

; sine table 2 x 1024 Byte
.db 128,128,129,130,131,131,132,133,134,135,135,136,137,138,138,139
.db 140,141,142,142,143,144,145,146,146,147,148,149,149,150,151,152
.db 152,153,154,155,156,156,157,158,159,159,160,161,162,162,163,164
.db 165,165,166,167,168,168,169,170,171,171,172,173,174,174,175,176
.db 176,177,178,179,179,180,181,182,182,183,184,184,185,186,186,187
.db 188,189,189,190,191,191,192,193,193,194,195,195,196,197,197,198
.db 199,199,200,201,201,202,202,203,204,204,205,206,206,207,207,208
.db 209,209,210,211,211,212,212,213,213,214,215,215,216,216,217,217
.db 218,219,219,220,220,221,221,222,222,223,223,224,224,225,225,226
.db 226,227,227,228,228,229,229,230,230,231,231,232,232,233,233,233
.db 234,234,235,235,236,236,236,237,237,238,238,238,239,239,240,240
.db 240,241,241,241,242,242,243,243,243,244,244,244,245,245,245,245
.db 246,246,246,247,247,247,247,248,248,248,249,249,249,249,250,250
.db 250,250,250,251,251,251,251,251,252,252,252,252,252,253,253,253
.db 253,253,253,253,254,254,254,254,254,254,254,254,255,255,255,255
.db 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255
.db 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255
.db 255,255,255,255,255,254,254,254,254,254,254,254,254,253,253,253
.db 253,253,253,253,252,252,252,252,252,251,251,251,251,251,250,250
.db 250,250,250,249,249,249,249,248,248,248,247,247,247,247,246,246
.db 246,245,245,245,245,244,244,244,243,243,243,242,242,241,241,241
.db 240,240,240,239,239,238,238,238,237,237,236,236,236,235,235,234
.db 234,233,233,233,232,232,231,231,230,230,229,229,228,228,227,227
.db 226,226,225,225,224,224,223,223,222,222,221,221,220,220,219,219
.db 218,217,217,216,216,215,215,214,213,213,212,212,211,211,210,209
.db 209,208,207,207,206,206,205,204,204,203,202,202,201,201,200,199
.db 199,198,197,197,196,195,195,194,193,193,192,191,191,190,189,189
.db 188,187,186,186,185,184,184,183,182,182,181,180,179,179,178,177
.db 176,176,175,174,174,173,172,171,171,170,169,168,168,167,166,165
.db 165,164,163,162,162,161,160,159,159,158,157,156,156,155,154,153
.db 152,152,151,150,149,149,148,147,146,146,145,144,143,142,142,141
.db 140,139,138,138,137,136,135,135,134,133,132,131,131,130,129,128
.db 128,127,126,125,124,124,123,122,121,120,120,119,118,117,117,116
.db 115,114,113,113,112,111,110,109,109,108,107,106,106,105,104,103
.db 103,102,101,100,99,99,98,97,96,96,95,94,93,93,92,91
.db 90,90,89,88,87,87,86,85,84,84,83,82,81,81,80,79
.db 79,78,77,76,76,75,74,73,73,72,71,71,70,69,69,68
.db 67,66,66,65,64,64,63,62,62,61,60,60,59,58,58,57
.db 56,56,55,54,54,53,53,52,51,51,50,49,49,48,48,47
.db 46,46,45,44,44,43,43,42,42,41,40,40,39,39,38,38
.db 37,36,36,35,35,34,34,33,33,32,32,31,31,30,30,29
.db 29,28,28,27,27,26,26,25,25,24,24,23,23,22,22,22
.db 21,21,20,20,19,19,19,18,18,17,17,17,16,16,15,15
.db 15,14,14,14,13,13,12,12,12,11,11,11,10,10,10,10
.db 9,9,9,8,8,8,8,7,7,7,6,6,6,6,5,5
.db 5,5,5,4,4,4,4,4,3,3,3,3,3,2,2,2
.db 2,2,2,2,1,1,1,1,1,1,1,1,0,0,0,0
.db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.db 0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2
.db 2,2,2,2,3,3,3,3,3,4,4,4,4,4,5,5
.db 5,5,5,6,6,6,6,7,7,7,8,8,8,8,9,9
.db 9,10,10,10,10,11,11,11,12,12,12,13,13,14,14,14
.db 15,15,15,16,16,17,17,17,18,18,19,19,19,20,20,21
.db 21,22,22,22,23,23,24,24,25,25,26,26,27,27,28,28
.db 29,29,30,30,31,31,32,32,33,33,34,34,35,35,36,36
.db 37,38,38,39,39,40,40,41,42,42,43,43,44,44,45,46
.db 46,47,48,48,49,49,50,51,51,52,53,53,54,54,55,56
.db 56,57,58,58,59,60,60,61,62,62,63,64,64,65,66,66
.db 67,68,69,69,70,71,71,72,73,73,74,75,76,76,77,78
.db 79,79,80,81,81,82,83,84,84,85,86,87,87,88,89,90
.db 90,91,92,93,93,94,95,96,96,97,98,99,99,100,101,102
.db 103,103,104,105,106,106,107,108,109,109,110,111,112,113,113,114
.db 115,116,117,117,118,119,120,120,121,122,123,124,124,125,126,127
.db 128,128,129,130,131,131,132,133,134,135,135,136,137,138,138,139
.db 140,141,142,142,143,144,145,146,146,147,148,149,149,150,151,152
.db 152,153,154,155,156,156,157,158,159,159,160,161,162,162,163,164
.db 165,165,166,167,168,168,169,170,171,171,172,173,174,174,175,176
.db 176,177,178,179,179,180,181,182,182,183,184,184,185,186,186,187
.db 188,189,189,190,191,191,192,193,193,194,195,195,196,197,197,198
.db 199,199,200,201,201,202,202,203,204,204,205,206,206,207,207,208
.db 209,209,210,211,211,212,212,213,213,214,215,215,216,216,217,217
.db 218,219,219,220,220,221,221,222,222,223,223,224,224,225,225,226
.db 226,227,227,228,228,229,229,230,230,231,231,232,232,233,233,233
.db 234,234,235,235,236,236,236,237,237,238,238,238,239,239,240,240
.db 240,241,241,241,242,242,243,243,243,244,244,244,245,245,245,245
.db 246,246,246,247,247,247,247,248,248,248,249,249,249,249,250,250
.db 250,250,250,251,251,251,251,251,252,252,252,252,252,253,253,253
.db 253,253,253,253,254,254,254,254,254,254,254,254,255,255,255,255
.db 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255
.db 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255
.db 255,255,255,255,255,254,254,254,254,254,254,254,254,253,253,253
.db 253,253,253,253,252,252,252,252,252,251,251,251,251,251,250,250
.db 250,250,250,249,249,249,249,248,248,248,247,247,247,247,246,246
.db 246,245,245,245,245,244,244,244,243,243,243,242,242,241,241,241
.db 240,240,240,239,239,238,238,238,237,237,236,236,236,235,235,234
.db 234,233,233,233,232,232,231,231,230,230,229,229,228,228,227,227
.db 226,226,225,225,224,224,223,223,222,222,221,221,220,220,219,219
.db 218,217,217,216,216,215,215,214,213,213,212,212,211,211,210,209
.db 209,208,207,207,206,206,205,204,204,203,202,202,201,201,200,199
.db 199,198,197,197,196,195,195,194,193,193,192,191,191,190,189,189
.db 188,187,186,186,185,184,184,183,182,182,181,180,179,179,178,177
.db 176,176,175,174,174,173,172,171,171,170,169,168,168,167,166,165
.db 165,164,163,162,162,161,160,159,159,158,157,156,156,155,154,153
.db 152,152,151,150,149,149,148,147,146,146,145,144,143,142,142,141
.db 140,139,138,138,137,136,135,135,134,133,132,131,131,130,129,128
.db 128,127,126,125,124,124,123,122,121,120,120,119,118,117,117,116
.db 115,114,113,113,112,111,110,109,109,108,107,106,106,105,104,103
.db 103,102,101,100,99,99,98,97,96,96,95,94,93,93,92,91
.db 90,90,89,88,87,87,86,85,84,84,83,82,81,81,80,79
.db 79,78,77,76,76,75,74,73,73,72,71,71,70,69,69,68
.db 67,66,66,65,64,64,63,62,62,61,60,60,59,58,58,57
.db 56,56,55,54,54,53,53,52,51,51,50,49,49,48,48,47
.db 46,46,45,44,44,43,43,42,42,41,40,40,39,39,38,38
.db 37,36,36,35,35,34,34,33,33,32,32,31,31,30,30,29
.db 29,28,28,27,27,26,26,25,25,24,24,23,23,22,22,22
.db 21,21,20,20,19,19,19,18,18,17,17,17,16,16,15,15
.db 15,14,14,14,13,13,12,12,12,11,11,11,10,10,10,10
.db 9,9,9,8,8,8,8,7,7,7,6,6,6,6,5,5
.db 5,5,5,4,4,4,4,4,3,3,3,3,3,2,2,2
.db 2,2,2,2,1,1,1,1,1,1,1,1,0,0,0,0
.db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.db 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
.db 0,0,0,0,0,1,1,1,1,1,1,1,1,2,2,2
.db 2,2,2,2,3,3,3,3,3,4,4,4,4,4,5,5
.db 5,5,5,6,6,6,6,7,7,7,8,8,8,8,9,9
.db 9,10,10,10,10,11,11,11,12,12,12,13,13,14,14,14
.db 15,15,15,16,16,17,17,17,18,18,19,19,19,20,20,21
.db 21,22,22,22,23,23,24,24,25,25,26,26,27,27,28,28
.db 29,29,30,30,31,31,32,32,33,33,34,34,35,35,36,36
.db 37,38,38,39,39,40,40,41,42,42,43,43,44,44,45,46
.db 46,47,48,48,49,49,50,51,51,52,53,53,54,54,55,56
.db 56,57,58,58,59,60,60,61,62,62,63,64,64,65,66,66
.db 67,68,69,69,70,71,71,72,73,73,74,75,76,76,77,78
.db 79,79,80,81,81,82,83,84,84,85,86,87,87,88,89,90
.db 90,91,92,93,93,94,95,96,96,97,98,99,99,100,101,102
.db 103,103,104,105,106,106,107,108,109,109,110,111,112,113,113,114
.db 115,116,117,117,118,119,120,120,121,122,123,124,124,125,126,127