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#include <reg51.h>
sbit SPK = P2^7;
void main(void)
{
/* NOTE: this program can not work correctly */
/*
#pragma asm
ORG 001BH ;timer/counter 1 interrupt entry
mov th1, r1 ;restore timer initial count
mov tl1, r0 ;
; setb p3.7 ;
cpl p2.7 ;p1.0 output square wave
reti ;
ORG 100H ;main function
ASM_ENTRY:
mov tmod, #01H ;timer/counter 1 works in mode 1
mov ie, #88H ;enable timer/counter 1 interrupt
mov dptr, #TAB ;table start address
LOOP:
clr a ;
movc a, @a + dptr ;read table item
mov r1, a ;high 8 bits of timer/counter 1 saves in r1
inc dptr ;
clr a ;
movc a, @a+dptr ;read next table item
mov r0, a ;low 8 bits of timer/counter 1 saves in r0
orl a, r1 ;
jz NEXT0 ;all 0 indicating a silence music symbol
mov a, r0 ;
anl a, r1 ;
cjne a, #0FFH, NEXT ;all 1 indicating a end music symbol
sjmp ASM_ENTRY ;begin to play another music cycle
NEXT:
mov th1, r1 ;store in timer/counter 1
mov tl1, r0 ;
setb tr1 ;run timer/counter 1
sjmp NEXT1 ;
NEXT0: clr tr1 ;
NEXT1: clr a ;
inc dptr ;
movc a, @a + dptr ;read delay constant
mov r2, a ;
LOOP1:
lcall D200 ;call delay 200ms subroutine
djnz r2, LOOP1 ;control delay count
inc dptr ;
ajmp LOOP ;process next music symbol
D200: mov r4, #81H ;delay 20ms subroutine
D200B: mov a, #0FFH ;
D200A: dec a ;
jnz D200A ;
dec r4 ;
cjne r4, #00H, D200B ;
ret ;
TAB:
DB 0FEH, 25H, 02H, 0FEH, 98H, 08H;
; DB 0FEH, 84H, 02H, 0FEH, 84H, 02H;
; DB 0FEH, 84H, 04H, 0FEH, 25H, 04H;
; DB 0FEH, 25H, 02H, 0FEH, 84H, 02H;
; DB 0FEH, 0C0H, 04H, 0FEH, 0C0H, 04H;
; DB 0FEH, 98H, 02H, 0FEH, 84H, 02H;
; DB 0FEH, 57H, 08H, 00H, 00H, 04H;
; DB 0FFH, 0FFH;
#pragma endasm
*/
/* play music using polling method */
/*
#pragma asm
ORG 0
ljmp ASM_ENTRY
ORG 0030H
ASM_ENTRY:
mov r3, #0 ;used as a index, pointer to the begin of a music score
READ_NOTE: ;read currect indexed music note.
mov dptr, #SCORE ;load music score address
mov a, r3 ;
movc a, @a + dptr ;read note
jz ASM_ENTRY ;0 is the end music symbol then loop
mov r7, a ;note saves in r7
inc r3 ;ready for reading note time
mov a, r3 ;
movc a, @a + dptr ;read time
mov r2, a ;time saves in r2
acall PLAY_NOTE ;
inc r3 ;ready for reading next note
sjmp READ_NOTE ;
mov a, r2 ;get time
jnz PLAY_NOTE
acall DELAY ;stop a second for replay
PLAY_NOTE:
acall ONE_EIGHT ;
djnz r2, PLAY_NOTE ;
ret
ONE_EIGHT:
mov a, r7 ;get note
mov dptr, #TONE_FREQUENCY ;
movc a, @a + dptr ;
mov r4, a ;
mov a, r7 ;
mov dptr, #TONE_LENGTH ;
movc a, @a + dptr ;
mov r5, a ;
DELAY:
acall SOUND ;
djnz r5, DELAY ;
ret ;
SOUND:
setb SPK ;
acall SDELAY ;
clr SPK ;
acall SDELAY ;
; cpl SPK ;add begin
; acall SDELAY ;add end
ret ;
SDELAY:
mov a, r4 ;
mov r0, a ;
D1: mov r1, #03H ;
D2: nop ;
djnz r1, D2 ;
djnz r0, D1 ;
ret ;
_DELAY_US: ;delay for 8us
nop;nop; ;4 * nop + call + ret =
nop;nop; ;4us + 2us + 2us = 8us
ret ;
DELAY_US: ;granularity is 10us
LOOP:
lcall _DELAY_US ;_DELAY + djnz = 8us + 2us = 10us
djnz r5, LOOP ;argument is saved in r5
ret ;real is n * 10us + call + ret = 10n + 4us
_DELAY_MS:
; push r5 ;protect r5 previous value
mov r5, #98 ;(980us + 4us) + 8us = 992us
lcall DELAY_US ;
nop;nop;nop; ;
nop;nop;nop; ;
ret ;
; pop r5 ;restore r5 previous value
DELAY_MS:
mov dptr, #DELAY_PARAMETER ;which number = 250 * r7 + r6
mov a, #0 ;
movc a, @a + dptr ;0-250
mov r6, a ;
inc a ;
movc a, @a + dptr ;0-3, in which domain[250n, 250n+250)
mov r7, a ;
; push r7 ;
; push r6 ;
LOOP1: mov a, r7 ;
jz DONE1 ;
dec r7 ;
LOOP2: mov a, r6 ;
jz DONE2 ;
dec r6 ;
acall _DELAY_MS ;loop2 one iterate time = 992us + 8us = 1000us
sjmp LOOP2 ;
DONE2:
mov r6, #250 ;
sjmp LOOP1 ;
DONE1:
; pop r6 ;
; pop r7 ;
ret ;
DELAY_PARAMETER:
DW 00H ;0 - 1000, low 8 bits represents 0-250, bit 8-9 represents a select.
TONE_LENGTH:
DS 1DH ;reserve 29 bytes
DB 15H,16H,00
DB 19H,00H,1CH,00H,1FH,21H,00H,25H
DB 00H,29H,2CH,00H,31H,34H,37H,00H
DB 3EH,41H,00H,49H,00H,52H,57H,00H
DB 62H
TONE_FREQUENCY:
DS 1DH ;reserve 29 bytes
DB 7EH,77H,00H
DB 6AH,00H,5EH,00H,54H,4FH,00H,46H
DB 00H,3FH,3BH,00H,35H,32H,2FH,00H
DB 2AH,27H,00H,23H,00H,1FH,1DH,0C0H
DB 1AH
SCORE:
DW 2202H,2902H,2902H,2902H,2906H,2702H ;
DW 2502H,2702H,2502H,2402H,2208H ;
DW 2E02H,2E02H,2E02H,2E02H,2E06H,2C02H ;
DW 2902H,2C02H,2D02H,2A02H,2908H ;
DW 2902H,2E02H,2E02H,2C02H,2906H,2702H ;
DW 2502H,2702H,2502H,2402H,2206H,1D02H ;
DW 1D02H,2502H,2502H,2402H,2206H,2902H ;
DW 2702H,2502H,2402H,2002H,2208H ;
DW 0000H
#pragma endasm
*/
/* play music using interrupt method */
/*
#pragma asm
; spk eql p2.7
ORG 0
ljmp ASM_ENTRY
ORG 0030H
ASM_ENTRY:
mov r3, #00H ;table index, clear to 0
NEXT:
mov a, r3
mov dptr, #TABLE ;load table start address
movc a, @a + dptr ;
jz ASM_ENTRY ;0 is the end music symbol then loop
mov r7, a ;r7 is current searched code byte
inc r3 ;read next code byte
mov a, r3 ;
movc a, @a + dptr ;
mov r2, a ;next byte stores in r2
acall SONG ;
inc r3 ;
sjmp NEXT ;
SONG:
mov a, r2 ;get rhythm
rl a ;
jnz KEEP ;
mov a, #01H ;
KEEP:
mov r2, a ;
REPEAT:
acall ONE_EIGHT ;
djnz r2, REPEAT ;
ret ;
ONE_EIGHT: ;generate one eight delay
mov a, r7 ;
mov dptr, #DELAY_T ;
movc a, @a + dptr ;
mov r4, a ;
mov a, r7 ;
mov dptr, #S_PARA ;
movc a, @a + dptr ;
mov r5, a
NEXT_CYC:
acall SOUND
djnz r5, NEXT_CYC ;
ret ;
SOUND:
setb SPK ;
acall SDELAY ;
clr SPK ;
acall SDELAY ;
ret ;
SDELAY:
mov a, r4 ;
mov r0, a ;
XL2: mov r1, #03H ;
DL1:
nop ;
djnz r1, DL1 ;
djnz r0, XL2 ;
ret ;
S_PARA:
;DS 01H
DS 1DH
DB 15H,16H,00
DB 19H,00H,1CH,00H,1FH,21H,00H,25H
DB 00H,29H,2CH,00H,31H,34H,37H,00H
DB 3EH,41H,00H,49H,00H,52H,57H,00H
DB 62H
DELAY_T:
DS 1DH
DB 7EH,77H,00H
DB 6AH,00H,5EH,00H,54H,4FH,00H,46H
DB 00H,3FH,3BH,00H,35H,32H,2FH,00H
DB 2AH,27H,00H,23H,00H,1FH,1DH,0C0H
DB 1AH
TABLE:
DW 2202H,2902H,2902H,2902H,2906H,2702H ;
DW 2502H,2702H,2502H,2402H,2208H ;
DW 2E02H,2E02H,2E02H,2E02H,2E06H,2C02H ;
DW 2902H,2C02H,2D02H,2A02H,2908H ;
DW 2902H,2E02H,2E02H,2C02H,2906H,2702H ;
DW 2502H,2702H,2502H,2402H,2206H,1D02H ;
DW 1D02H,2502H,2502H,2402H,2206H,2902H ;
DW 2702H,2502H,2402H,2002H,2208H ;
DW 0000H
#pragma endasm
*/
}

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