;CDROM IDE INTERFACE ;TESTED ON MODELS CREATIVE SB CR-581-J (QUAD SPEED) ;& GOLDSTAR (LG) CRD-8400C (40X SPEED) ; ;SHORT PROGRAMME TO CONTROL A CDROM VIA THE IDE ;ONLY SENDS A FEW COMMANDS BUT ITS A START ;Ryan Pogge says: ;The next step is to read the TOC and create some type of list from that on the PIC ;looks like it is a matter of sending 8c 0 e 0 0 0 0 , and getting 9 bytes back. ;anyone who is interested I have a couple of links that may be of some use ;http://www.geocities.com/SiliconValley/Hardware/2342/mp3player.html this is a 68HC11 based MP3 player with an IDE CD-ROM, I suspect this will have mush pertinate info. ;http://www-stu.cai.cam.ac.uk/~atm26/electronics/panasoniccd.html list of error codes ;http://www.mp3ar.com/ (this is a cd based mp3 player with free source code!) ;http://www.spectsoft.com/mp3tech/ (good CD, MP3, and IDE stuff here) ;http://www.angelfire.com/ms/mp3player/page17.html ;http://www.faqs.org/faqs/pc-hardware-faq/enhanced-IDE/part2/ ;http://pages.hotbot.com/cooking/anton_verheijen/main.html ;http://www.imbdev.com/ (MAS3507 proto boards) ;COMMANDS SENT DEPENDING ON PORTB PINS 5/4/3 & RE2 ;EJECT/LOAD/PLAY STATED MSF/ STOP. ;CURRENTLY SUPPORTS NO INTERRUPT HANDLING OR ERROR CONDITIONS ;RETURNED FROM IDE ;SET YOUR CDROM TO MASTER DEVICE ;********************************************************************** ;SEE DOC ATA Packet Interface for CD-ROMs SFF-8020i ; Filename: COM1.asm ; Date: ; File Version: VER1 ; ; Author:ROB BOARDMAN * ; Company: ;********************************************************************** ;USING 16MHZ CRYSTAL & PIC NO OTHER IC'S REQUIRED MAY WORK AT 20MHZ ;SOME PINS ON PORTB ARE SWITCH INPUTS ;IF USING RE2 AS SWITCH INPUT ADD PULLUP RESISTOR ;PIN CONNECTIONS ; ; PIC IDE * ; PORTA ; 0 37 CS0 ; 1 38 CS1 ; 2 35 A0 ; 3 33 A1 ; 4 36 A2 ; 5 34 PDIAG ; PORTB ; 0 1 RESET ; 1 27 IORDY ; 2 31 IRQ ; 3 ; 4 ; 5 ; 6 ; 7 ; PORTC ; 0 3 D0 ; 1 5 D1 ; 2 7 D2 ; 3 9 D4 ; 4 11 D5 ; 5 13 D6 ; 6 15 D7 ; M. Adam Davis says: ; it looks like you've almost got the listing backwards... ; Is it supposed to be: ; PORTC ; 0 17 D0 ; 1 15 D1 ; 2 13 D2 ; 3 11 D3 ; 4 9 D4 ; 5 7 D5 ; 6 5 D6 ; 7 3 D7 ; PORTD ; 0 4 D8 ; 1 6 D9 ; 2 8 D10 ; 3 10 D11 ; 4 12 D12 ; 5 14 D13 ; 6 16 D14 ; 7 18 D15 ; PORTE ; 0 25 nDIOR ; 1 23 nDIOW ; 2 GND ; 19 GND ; 22 GND ; 24 GND ; 26 GND ; 30 GND ; 40 GND ;This example has a couple of switches connected for various CD functions as follows ;RB3 EJECT DISC internal pullup ;RB4 STOP DISC internal pullup ;RB5 PLAY DISC internal pullup ;RE2 LOAD DISC Note use pull resistor ;************************************************************************* ;************************************************************************* ;************************************************************************* ;************************************************************************* list p=16f877 ; list directive to define processor #include <p16f877.inc> ; processor specific variable definitions __CONFIG _CP_OFF & _WDT_OFF & _BODEN_ON & _PWRTE_ON & _HS_OSC & _WRT_ENABLE_ON & _LVP_OFF & _DEBUG_OFF & _CPD_OFF ;***** VARIABLE DEFINITIONS DELAY0 EQU 0X2C DELAY1 EQU 0X2D DELAY2 EQU 0X2E FLAGREG EQU 0X2F #DEFINE ERROR 0X2F,0 ;ERROR STATUS #DEFINE SECONDWR 0X2F,1 TEMP1 EQU 0X30 TEMP EQU 0X31 TEMP0 EQU 0X32 REGISTER EQU 0X33 ACCA EQU 0X34 PACK EQU 0X35 TEXT EQU 0X36 status_temp EQU 0X3E w_temp EQU 0X3F CTRL EQU 0 CMD EQU 1 DRIVE0 EQU 0 ;************************************************** ;PIN ASSIGNMENTS TO IDE #DEFINE nCS1FX 0X05,0 #DEFINE nCS3FX 0X05,1 #DEFINE DA0 0X05,2 #DEFINE DA1 0X05,3 #DEFINE DA2 0X05,4 #DEFINE nDASP 0X05,5 #DEFINE nDIOR 0X09,0 #DEFINE nDIOW 0X09,1 #DEFINE INTRQ 0X06,2 #DEFINE IORDY 0X06,1 #DEFINE RESET 0X06,0 ;*************************************************** ;THESE ARE SIGNALS WHICH END UP ON PORTA ;ADDRESSES VARIOUS REGISTERS WITHIN THE IDE DEVICE COMMANDREG EQU B'00011110' ;WRITE STATUSREG EQU B'00011110' ;READ DATAREG EQU B'00000010' ;BITS WITHIN STATUS REG OF IDE BSY EQU 7 DRQ EQU 3 ;BITS WITHIN Interrupt Reason Register CoD EQU 0 IO EQU 1 #DEFINE DELAYS ;********************************************************************** ORG 0x000 NOP clrf PCLATH ; ensure page bits are cleared goto init ; ORG 0x004 ; interrupt vector location movwf w_temp ; save off current W register contents movf STATUS,w ; move status register into W register movwf status_temp ; save off contents of STATUS register movf status_temp,w ; retrieve copy of STATUS register movwf STATUS ; restore pre-isr STATUS register contents swapf w_temp,f swapf w_temp,w ; restore pre-isr W register contents retfie ; return from interrupt ;************************************************************************** ;************************************************************************** ; initialization routine ;SETUP ALL PORTS init BSF STATUS,RP0 ;SET PAGE 1 MOVLW B'00100000' ; MOVWF TRISA MOVLW B'00111110' ; MOVWF TRISB MOVLW B'11111111' MOVWF TRISC MOVLW B'11111111' MOVWF TRISD MOVLW B'00000100' MOVWF TRISE MOVLW B'10000110' MOVWF ADCON1 BCF OPTION_REG,NOT_RBPU ;PULLUPS ON BCF STATUS,RP0 ;BACK TO PAGE 0 CLRF PORTA CLRF PORTB CLRF PORTC CLRF PORTD ;********************************************************* BCF RESET ;SETUPS IDE AND RESETS CALL PAUSE bsf nCS1FX BSF nCS3FX BSF nDIOR BSF nDIOW CALL PAUSE CALL PAUSE BSF RESET call PAUSE CALL PAUSE CALL PAUSE CALL PAUSE CALL PAUSE CLRF FLAGREG GOTO START ;*************************************** ;*************************************** ;*************************************** PAUSE IFDEF DELAYS CLRWDT MOVLW .255 ; MOVWF DELAY0 ; DELLP DECFSZ DELAY0 ; GOTO DELLP ; ENDIF RETURN ;************************************************************************ WRITEIDE BSF nDIOW ;PUTS DATA FROM TEMP0 & TEMP1 REGISTERS MOVF REGISTER,W ;ON TO IDE DATABUS LINE D0-D15 THEN TOGGLES MOVWF PORTA ;nDIOW PIN (WRITE INSTRUCTION) BSF STATUS,RP0 MOVLW B'00000000' MOVWF TRISC MOVWF TRISD BCF STATUS,RP0 MOVF TEMP0,W MOVWF PORTC MOVF TEMP1,W MOVWF PORTD BCF nDIOW BSF nDIOW BSF STATUS,RP0 ;SET PAGE 1 MOVLW B'11111111' ; MOVWF TRISC MOVWF TRISD BCF STATUS,RP0 RETURN ;****************************************************************** READIDE NOP ;READS IDE DATA BUS D0-D15 BCF nDIOR ;PLACES DATA INTO TEMP0 & TEMP1 REGISTERS BSF nDIOR MOVF PORTC,W MOVWF TEMP0 MOVF PORTD,W MOVWF TEMP1 RETURN ;******************************************************************** CHKCoD BCF ERROR ;CoD=1 IO=0 MOVLW B'10001010' ;ERROR CHECKING NOT YET SUPPORTED MOVWF PORTA CALL READIDE BTFSS TEMP0,CoD BSF ERROR BTFSC TEMP0,IO BSF ERROR NOP BTFSC ERROR GOTO TEST5 RETURN TEST5 INCF TEMP GOTO CHKCoD ;******************************************************************* CHKDRQ BCF ERROR ;BSY=0 DRQ=1 CALL RDSTATUS ;;ERROR CHECKING NOT YET SUPPORTED BTFSC TEMP0,BSY BSF ERROR BTFSS TEMP0,DRQ BSF ERROR NOP BTFSC ERROR GOTO TEST6 RETURN TEST6 INCF TEMP GOTO CHKDRQ ;****************************************************************** ;******************************************************************* ;ROUTINE SENDS 12 BYTE PACKET TO IDE DEVICE SENDCOM CALL CHKSTATUS ;DO CHECK ;*********************************** MOVLW COMMANDREG ;POINT TO COMMAND REG THEN SEND MOVWF REGISTER ;PACKET OPCODE COMMAND MOVLW 0XA0 MOVWF TEMP0 CALL WRITEIDE ;************************************ ;CHECK STATUS OF IDE CALL CHKCoD ;CHK CoD & IO & BSY CALL CHKDRQ ;WAIT FOR DRQ=1 ;************************************ MOVLW DATAREG ;POINT TO DATA REGISTER THEN SEND MOVWF REGISTER ;12 BYTES TO DATA REGISTER WITHIN IDE (1 PACKET) CLRF ACCA NXREG2 CALL PACKET MOVWF TEMP0 INCF ACCA INCF PACK CALL PACKET MOVWF TEMP1 CALL WRITEIDE INCF PACK INCF ACCA MOVLW 0X0C SUBWF ACCA, 0 BTFSS STATUS,Z GOTO NXREG2 RETLW 00H ;END OF PACKET RETURN TO MAIN PROGRAM ;******************************************************************* ;12 BYTE LOOKUP TABLE FOR CDROM COMMANDS ;DEPENDING ON THE VALUE OF PACK LOOKUP JUMPS TO ;RETURNS WITH 1 OF 12 BYTES ; PACKET MOVF PACK,W BCF PCLATH,0 BCF PCLATH,1 MOVF PACK,0 ADDWF PCL ;************************* RETLW 0X1B ;0 STOP DISC COMMAND RETLW 0X00 ;1 RETLW 0X00 ;2 RETLW 0X00 ;3 RETLW 0X00 ;4 RETLW 0X00 ;5 RETLW 0X00 ;6 RETLW 0X00 ;7 RETLW 0X00 ;8 RETLW 0X00 ;9 RETLW 0X00 ;10 RETLW 0X00 ;11 ;****************************************** RETLW 0X47 ;0 0XC0 RETLW 0X00 ;1 THIS EXAMPLE PLAYS AT 1min in for 30sec's RETLW 0X00 ;2 PLAY DISC AT TIME STATED MIN SEC 1/75/SEC RETLW 0X01 ;3 MINUTES STARTING POINT RETLW 0X00 ;4 SECONDS STARTING POINT RETLW 0X00 ;5 1/75 SEC STARTING POINT (N/A) RETLW 0X01 ;6 MINUTES STOPING POINT RETLW 0X1E ;7 SECONDS STOPING POINT RETLW 0X00 ;8 1/75 STOPPING POINT (N/A) RETLW 0X00 ;9 RETLW 0X00 ;10 RETLW 0X00 ;11 ;****************************************** RETLW 0X1B ;0 0X18 RETLW 0X00 ;1 EJECT DISC COMMAND RETLW 0X00 ;2 RETLW 0X00 ;3 RETLW 0X02 ;4 RETLW 0X00 ;5 RETLW 0X00 ;6 RETLW 0X00 ;7 RETLW 0X00 ;8 RETLW 0X00 ;9 RETLW 0X00 ;10 RETLW 0X00 ;11 ;****************************************** RETLW 0X1B ;0 0X24 RETLW 0X00 ;1 LOAD DISC COMMAND RETLW 0X00 ;2 RETLW 0X00 ;3 RETLW 0X03 ;4 RETLW 0X00 ;5 RETLW 0X00 ;6 RETLW 0X00 ;7 RETLW 0X00 ;8 RETLW 0X00 ;9 RETLW 0X00 ;10 RETLW 0X00 ;11 ;****************************************** RETLW 0X43 ;0 0X30 RETLW 0X00 ;1 RETLW 0X00 ;2 RETLW 0X00 ;3 RETLW 0X00 ;4 RETLW 0X00 ;5 RETLW 0X00 ;6 RETLW 0X00 ;7 RETLW 0X08 ;8 RETLW 0X00 ;9 RETLW 0X00 ;10 RETLW 0X00 ;11 ;****************************************** ;****************************************** WRITEHD MOVLW B'10011010' ;WRITE TO HEAD DEVICE REG WITHIN IDE MOVWF REGISTER MOVLW B'10100000' ;SET CDROM HEAD REG TO MASTER MOVWF TEMP0 CLRF TEMP1 CALL WRITEIDE RETURN RDHD MOVLW B'10011010' ;READS HEAD REG MOVWF PORTA ;I USED THIS TO CHECK CALL READIDE ;IF CDROM WAS SET AS MASTER RETURN RDSTATUS MOVLW B'10011110' ;READS STATUS REGISTER WITHIN IDE MOVWF PORTA CALL READIDE RETURN CHKSTATUS BCF ERROR CALL RDSTATUS BTFSC TEMP0,BSY BSF ERROR BTFSC TEMP0,DRQ BSF ERROR NOP BTFSC ERROR GOTO TEST4 RETURN TEST4 INCF TEMP GOTO CHKSTATUS ;***************************************** ;LOADS PACK REGISTER FOR LOOKUP TABLE ;THEN CALLS ROUTINE TO SEND 12 BYTES (1 PACKET) PLAY MOVLW 0X0C MOVWF PACK CALL SENDCOM RETURN STOP MOVLW 0X00 MOVWF PACK CALL SENDCOM RETURN EJECT MOVLW 0X18 MOVWF PACK CALL SENDCOM RETURN LOADDISC MOVLW 0X24 MOVWF PACK CALL SENDCOM RETURN ;**************************************************************************** START CALL PAUSE CALL CHKSTATUS CALL PAUSE NOP CALL WRITEHD ;SETUP FOR MASTER DRIVE NOP CALL PAUSE CALL RDHD ;READ DRIVEHEAD (CHECKING MASTER DRIVE SETTING)OPTIONAL CALL PAUSE ;NOTE THERE IS NO DEBOUNCE SOFTWARE AT THE MOMENT ;SO RELEASE THE BUTTON QUICKLY TEST1 BTFSS PORTB,5 CALL PLAY BTFSS PORTB,4 CALL STOP BTFSS PORTB,3 CALL EJECT BCF ERROR BTFSS PORTE,2 CALL LOADDISC CALL PAUSE CALL RDSTATUS GOTO TEST1 END
Questions:
i need to understand how to control a cd rom drive out side of a PC to operate as a cd player. through its ide interface. can any one help. The CD rom drive i'm usin is the hitatchi CDR-7930. Thank you+
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