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458 lines
12 KiB
458 lines
12 KiB
;======================================================================
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;
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; BIT MODE SOUND DRIVER FOR SBC V2 USING BIT 0 OF RTC DRIVER
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;
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;======================================================================
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;
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; LIMITATIONS - CPU FREQUENCY ADJUSTMENT LIMITED TO 1MHZ RESOLUTION
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; QUARTER TONES NOT SUPPORTED
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; DURATION FIXED TO 1 SECOND.
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; NO VOLUME ADJUSTMENT DUE TO HARDWARE LIMITATION
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;======================================================================
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;
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; DRIVER FUNCTION TABLE AND INSTANCE DATA
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;
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SP_FNTBL:
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.DW SP_STUB ; SP_RESET
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.DW SP_STUB ; SP_VOLUME
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.DW SP_PERIOD
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.DW SP_NOTE
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.DW SP_PLAY
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.DW SP_QUERY
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.DW SP_DURATION
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.DW SP_DEVICE
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;
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#IF (($ - SP_FNTBL) != (SND_FNCNT * 2))
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.ECHO "*** INVALID SND FUNCTION TABLE ***\n"
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!!!!!
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#ENDIF
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;
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SP_IDAT .EQU 0 ; NO INSTANCE DATA ASSOCIATED WITH THIS DEVICE
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;
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SP_TONECNT .EQU 1 ; COUNT NUMBER OF TONE CHANNELS
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SP_NOISECNT .EQU 0 ; COUNT NUMBER OF NOISE CHANNELS
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;
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SP_RTCIOMSK .EQU 00000100B
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;
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; FOR OTHER DRIVERS, THE PERIOD VALUE FOR THE TONE IS STORED AT PENDING_PERIOD
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; FOR THE SPK DRIVER THE ADDRESS IN THE TONE TABLE IS STORED IN PENDING_PERIOD
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;
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SP_PENDING_PERIOD .DW SP_NOTE_C8 ; PENDING PERIOD (16 BITS)
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SP_PENDING_VOLUME .DB $FF ; PENDING VOL (8 BITS)
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SP_PENDING_DURATION .DW 0 ; PENDING DURATION (16 BITS)
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;
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;======================================================================
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; DRIVER INITIALIZATION
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;======================================================================
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;
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SP_INIT:
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LD IY, SP_IDAT ; SETUP FUNCTION TABLE
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LD BC, SP_FNTBL ; POINTER TO INSTANCE DATA
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LD DE, SP_IDAT ; BC := FUNCTION TABLE ADDRESS
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CALL SND_ADDENT ; DE := INSTANCE DATA PTR
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;
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CALL NEWLINE ; ANNOUNCE DEVICE
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PRTS("SPK: IO=0x$")
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LD A,RTCIO
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CALL PRTHEXBYTE
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CALL SP_SETTBL ; SETUP TONE TABLE
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CALL SP_PLAY ; PLAY DEFAULT NOTE
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XOR A
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RET
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - RESET
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;======================================================================
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;
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;SP_RESET:
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; XOR A ; SUCCESSFULL RESET
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; RET
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - VOLUME
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;======================================================================
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;
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;SP_VOLUME:
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; XOR A ; SIGNAL SUCCESS
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; RET
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - PERIOD
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;======================================================================
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;
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SP_PERIOD:
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LD (SP_PENDING_PERIOD), HL ; SAVE AND RETURN SUCCESSFUL
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SP_STUB:
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XOR A
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RET
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - NOTE
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;======================================================================
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;
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SP_NOTE:
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; CALL PRTHEXWORDHL
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; CALL PC_COLON
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PUSH HL
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PUSH DE ; ON ENTRY HL IS A NOTE INDEX
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LD A,L ; CONVERT THIS NOTE INDEX
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AND 00000011B ; TO THE ASSOCIATED ENTRY
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JR Z,SP_NOTE1 ; IN THE TUNE TABLE.
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;
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LD HL,$FFFF ; QUARTER NOTES
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JR SP_NOTE2 ; NOT SUPPORTED
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;
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SP_NOTE1:
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LD DE,SP_TUNTBL ; SAVE THIS ADDRESS AS
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ADD HL,DE ; THE PERIOD
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SP_NOTE2:
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; CALL PRTHEXWORDHL
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; CALL NEWLINE
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LD (SP_PENDING_PERIOD),HL
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POP DE
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POP HL
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RET
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - QUERY AND SUBFUNCTIONS
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;======================================================================
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;
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SP_QUERY:
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LD A, E
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CP BF_SNDQ_CHCNT ; SUB FUNCTION 01
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JR Z, SP_QUERY_CHCNT
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;
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CP BF_SNDQ_VOLUME ; SUB FUNCTION 02
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JR Z, SP_QUERY_VOLUME
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;
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CP BF_SNDQ_PERIOD ; SUB FUNCTION 03
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JR Z, SP_QUERY_PERIOD
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;
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CP BF_SNDQ_DEV ; SUB FUNCTION 04
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JR Z, SP_QUERY_DEV
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;
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OR $FF ; SIGNAL FAILURE
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RET
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;
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SP_QUERY_CHCNT:
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LD BC,(SP_TONECNT*256)+SP_NOISECNT ; RETURN NUMBER OF
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XOR A ; TONE AND NOISE
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RET ; CHANNELS IN BC
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;
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SP_QUERY_PERIOD:
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LD HL, (SP_PENDING_PERIOD) ; RETURN 16-BIT PERIOD
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XOR A ; IN HL REGISTER
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RET
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;
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SP_QUERY_VOLUME:
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LD L, 255 ; RETURN 8-BIT VOLUME
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XOR A ; IN L REGISTER
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RET
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;
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SP_QUERY_DEV:
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LD B, SNDDEV_BITMODE ; RETURN DEVICE IDENTIFIER
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LD DE, (RTCIO*256)+SP_RTCIOMSK ; AND ADDRESS AND DATA PORT
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XOR A
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RET
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;
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;======================================================================
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; INITIALIZE THE TONE TABLE - ONLY ACCURATE FOR 1MHZ INCREMENTS
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;======================================================================
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;
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SP_SETTBL:
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LD HL,(CB_CPUKHZ) ; GET CPU SPEED.
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LD DE,1000 ; CONVERT TO MHZ
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CALL DIV16
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;
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LD DE,900 ; IF MHZ IS WITHIN 10% OF
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SBC HL,DE ; NEXT INTEGER INCREMENT
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JP M,SP_SETTBL3 ; THEN BUMP UP. I.E. 9.928MHZ
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INC C ; BECOMES 10MHZ
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;
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SP_SETTBL3:
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LD B,SP_NOTCNT ; SET NUMBER OF NOTES TO
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LD HL,SP_TUNTBL+2 ; ADJUST AND START POINT
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;
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SP_SETTBL2:
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PUSH HL
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LD E,(HL) ; READ IN
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INC HL ; THE 1MHZ
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LD D,(HL) ; NOTE
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;
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PUSH BC
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LD B,C
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LD HL,0 ; MULTIPLY 1MHZ
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SP_SETTBL1: ; NOTE VALUE BY
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ADD HL,DE ; SYSTEM MHZ
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JR NC,SP_SETBL4
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LD HL,$FFFF ; FOR CPU > 10MHz
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LD B,1 ; HANDLE OVERFLOW
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SP_SETBL4:
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DJNZ SP_SETTBL1
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POP BC
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;
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LD DE,15 ; ADD OVERHEAD
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ADD HL,DE ; COMPENSATION
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;
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POP DE ; RECALL NOTE
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EX DE,HL ; ADDRESS
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;
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LD (HL),E ; SAVE
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INC HL ; THE
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LD (HL),D ; NEW
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INC HL ; NOTE
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INC HL ; AND MOVE
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INC HL ; TO NEXT
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;
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DJNZ SP_SETTBL2 ; NEXT NOTE
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RET
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - PLAY
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;======================================================================
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;
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SP_PLAY:
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LD HL,(SP_PENDING_PERIOD) ; SELECT NOTE
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;
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LD A,$FF ; EXIT WITH ERROR
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CP H ; STATUS IF INVALID
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JR NZ,SP_PLAY1 ; PERIOD ($FFFF)
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CP L
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RET Z
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SP_PLAY1:
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LD E,(HL) ; LOAD 1ST ARG
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INC HL ; IN DE
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LD D,(HL)
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INC HL
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;
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LD C,(HL) ; LOAD 2ND ARG
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INC HL ; IN BC
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LD B,(HL)
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INC HL
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;
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; LD A,$FF ; EXIT WITH ERROR
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CP B ; STATUS IF INVALID
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JR NZ,SP_PLAY2 ; NOTE ($FFFF)
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CP C
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RET Z
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;
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SP_PLAY2:
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PUSH BC ; SETUP ARG IN HL
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POP HL
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;
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; CALL SP_BEEPER ; PLAY
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;
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; RET
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;
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; The following SP_BEEPER routine is a modification of code from
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; "The Complete SPECTRUM ROM DISSASSEMBLY" by Dr Ian Logan & Dr Frank O’Hara
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;
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; https://www.esocop.org/docs/CompleteSpectrumROMDisassemblyThe.pdf
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;
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; DE Number of passes to make through the sound generation loop
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; HL Loop delay parameter
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;
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SP_BEEPER:
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PUSH IX
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HB_DI ; Disable the interrupt for the duration of a 'beep'.
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LD A,L ; Save L temporarily.
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SRL L ; Each '1' in the L register is to count 4 T states, but take INT (L/4) and count 16 T states instead.
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SRL L
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CPL ; Go back to the original value in L and find how many were lost by taking 3-(A mod 4).
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AND $03
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LD C,A
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LD B,$00
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LD IX,SPK_DLYADJ ; The base address of the timing loop.
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ADD IX,BC ; Alter the length of the timing loop. Use an earlier starting point for each '1' lost by taking INT (L/4).
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LD A,(HB_RTCVAL) ; Fetch the present border colour from BORDCR and move it to bits 2, 1 and 0 of the A register.
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;
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; The HL register holds the 'length of the timing loop' with 16 T states being used for each '1' in the L register and 1024 T states for each '1' in the H register.
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;
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SPK_DLYADJ:
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NOP ; Add 4 T states for each earlier entry point that is used.
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NOP
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NOP
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INC B ; The values in the B and C registers will come from the H and L registers - see below.
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INC C
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BE_H_L_LP:
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DEC C ; The 'timing loop', i.e. BC*4 T states. (But note that at the half-cycle point, C will be equal to L+1.)
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JR NZ,BE_H_L_LP
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LD C,$3F
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DEC B
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JP NZ,BE_H_L_LP
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;
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; The loudspeaker is now alternately activated and deactivated.
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;
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XOR SP_RTCIOMSK ; Flip bit 2.
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OUT (RTCIO),A ; Perform the 'OUT' operation, leaving other bits unchanged.
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LD B,H ; Reset the B register.
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LD C,A ; Save the A register.
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BIT 4,A ; Jump if at the half-cycle point.
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JR NZ,BE_AGAIN
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;
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; After a full cycle the DE register pair is tested.
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;
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LD A,D ; Jump forward if the last complete pass has been made already.
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OR E
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JR Z,BE_END
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LD A,C ; Fetch the saved value.
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LD C,L ; Reset the C register.
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DEC DE ; Decrease the pass counter.
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JP (IX) ; Jump back to the required starting location of the loop.
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;
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; The parameters for the second half-cycle are set up.
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;
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BE_AGAIN:
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LD C,L ; Reset the C register.
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INC C ; Add 16 T states as this path is shorter.
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JP (IX) ; Jump back.
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BE_END:
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HB_EI
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POP IX
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RET ; ALWAYS EXITS WITH SUCCESS STATUS (A=0)
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - DURATION
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;======================================================================
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;
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SP_DURATION:
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LD (SP_PENDING_DURATION),HL; SET TONE PERIOD TO ZERO
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XOR A
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RET
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;
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;======================================================================
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; SOUND DRIVER FUNCTION - DEVICE
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;======================================================================
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;
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SP_DEVICE:
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LD D,SNDDEV_BITMODE ; D := DEVICE TYPE
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LD E,0 ; E := PHYSICAL UNIT
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LD C,$00 ; C := DEVICE TYPE
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LD H,0 ; H := 0, DRIVER HAS NO MODES
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LD L,RTCIO ; L := BASE I/O ADDRESS
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XOR A
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RET
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;
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;======================================================================
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;
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; STANDARD ONE SECOND TONE TABLES AT 1MHZ.
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; FOR SP_BEEPER ROUTINE, FIRST WORD LOADED INTO DE, SECOND INTO HL
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;
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;======================================================================
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;
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#DEFINE SP_TONESET(SP_FREQ) .DW SP_FREQ/100, 12500000/SP_FREQ
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;
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SP_TUNTBL:
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SP_TONESET(1635) ; C0
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SP_TONESET(1732) ; C
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SP_TONESET(1835) ; D0
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SP_TONESET(1945) ; D
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SP_TONESET(2060) ; E0
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SP_TONESET(2183) ; F0
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SP_TONESET(2312) ; F
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SP_TONESET(2450) ; G0
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SP_TONESET(2596) ; G
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SP_TONESET(2750) ; A0
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SP_TONESET(2914) ; A
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SP_TONESET(3087) ; B0
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SP_TONESET(3270) ; C1
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SP_TONESET(3465) ; C
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SP_TONESET(3671) ; D1
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SP_TONESET(3889) ; D
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SP_TONESET(4120) ; E1
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SP_TONESET(4365) ; F1
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SP_TONESET(4625) ; F
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SP_TONESET(4900) ; G1
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SP_TONESET(5191) ; G
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SP_TONESET(5500) ; A1
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SP_TONESET(5827) ; A
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SP_TONESET(6174) ; B1
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SP_TONESET(6541) ; C2
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SP_TONESET(6930) ; C
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SP_TONESET(7342) ; D2
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SP_TONESET(7778) ; D
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SP_TONESET(8241) ; E2
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SP_TONESET(8731) ; F2
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SP_TONESET(9250) ; F
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SP_TONESET(9800) ; G2
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SP_TONESET(10383) ; G
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SP_TONESET(11000) ; A2
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SP_TONESET(11654) ; A
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SP_TONESET(12347) ; B2
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SP_TONESET(13081) ; C3
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SP_TONESET(13859) ; C
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SP_TONESET(14683) ; D3
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SP_TONESET(15556) ; D
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SP_TONESET(16481) ; E3
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SP_TONESET(17461) ; F3
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SP_TONESET(18500) ; F
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SP_TONESET(19600) ; G3
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SP_TONESET(20765) ; G
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SP_TONESET(22000) ; A3
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SP_TONESET(23308) ; A
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SP_TONESET(24694) ; B3
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SP_TONESET(26163) ; C4
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SP_TONESET(27718) ; C
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SP_TONESET(29366) ; D4
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SP_TONESET(31113) ; D
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SP_TONESET(32963) ; E4
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SP_TONESET(34923) ; F4
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SP_TONESET(36999) ; F
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SP_TONESET(39200) ; G4
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SP_TONESET(41530) ; G
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SP_TONESET(44000) ; A4
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SP_TONESET(46616) ; A
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SP_TONESET(49388) ; B4
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SP_TONESET(52325) ; C5
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SP_TONESET(55437) ; C
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SP_TONESET(58733) ; D5
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SP_TONESET(62225) ; D
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SP_TONESET(65925) ; E5
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SP_TONESET(69846) ; F5
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SP_TONESET(73999) ; F
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SP_TONESET(78399) ; G5
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SP_TONESET(83061) ; G
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SP_TONESET(88000) ; A5
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SP_TONESET(93233) ; A
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SP_TONESET(98777) ; B5
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SP_TONESET(104650) ; C6
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SP_TONESET(110873) ; C
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SP_TONESET(117466) ; D6
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SP_TONESET(124451) ; D
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SP_TONESET(131851) ; E6
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SP_TONESET(139691) ; F6
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SP_TONESET(147998) ; F
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SP_TONESET(156798) ; G6
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SP_TONESET(166122) ; G
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SP_TONESET(179000) ; A6
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SP_TONESET(186466) ; A
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SP_TONESET(197553) ; B6
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SP_TONESET(209300) ; C7
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SP_TONESET(221746) ; C
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SP_TONESET(234932) ; D7
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SP_TONESET(248902) ; D
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SP_TONESET(263702) ; E7
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SP_TONESET(279383) ; F7
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SP_TONESET(295996) ; F
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SP_TONESET(313596) ; G7
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SP_TONESET(332244) ; G
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SP_TONESET(352000) ; A7
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SP_TONESET(372931) ; A
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SP_TONESET(395107) ; B7
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SP_NOTE_C8:
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SP_TONESET(418601) ; C8
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SP_TONESET(443492) ; C
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SP_TONESET(469863) ; D8
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SP_TONESET(497803) ; D
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SP_TONESET(527404) ; E8
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SP_TONESET(558765) ; F8
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SP_TONESET(591991) ; F
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SP_TONESET(627193) ; G8
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SP_TONESET(664488) ; G
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SP_TONESET(704000) ; A8
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SP_TONESET(745862) ; A
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SP_TONESET(790213) ; B8
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;
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SP_NOTCNT .EQU ($-SP_TUNTBL) / 4
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;
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