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172 lines
4.0 KiB
172 lines
4.0 KiB
;
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;==================================================================================================
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; EZ80 ON-CHIP CLOCK DRIVER
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;==================================================================================================
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;
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EZ80RTC_BUFSIZ .EQU 6 ; SIX BYTE BUFFER (YYMMDDHHMMSS)
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;
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; RTC DEVICE INITIALIZATION ENTRY
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DEVECHO "EZ80 RTC:\n"
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EZ80RTC_INIT:
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; display driver install message
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; delegate init function to firmware
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; install dispatcher
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; dispatch local routine that delgates to firmware routines
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LD A, (RTC_DISPACT) ; RTC DISPATCHER ALREADY SET?
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OR A ; SET FLAGS
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RET NZ ; IF ALREADY ACTIVE, ABORT
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CALL NEWLINE ; FORMATTING
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PRTS("EZ80 RTC: ON-CHIP$")
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LD A, 1 ; RTC FIRMWARE FUNCTION GROUP
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LD B, 0 ; RTC INIT FUNCTION
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EZ80_FN
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; TODO VERIFY SUCCESS -> A IS ZERO
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; DISPLAY CURRENT TIME
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LD HL, EZ80RTC_BCDBUF_EXT ; POINT TO BCD BUF EXTENDED
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LD A, 1 ; RTC FIRMWARE FUNCTION GROUP
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LD B, 1 ; READ DATE-TIME INTO (HL)
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EZ80_FN
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LD HL, EZ80RTC_BCDBUF ; POINT TO BCD BUF
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CALL PRTDT ; DISPLAY THIS TIME
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;
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LD BC, EZ80RTC_DISPATCH
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CALL RTC_SETDISP
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;
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XOR A ; SIGNAL SUCCESS
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RET
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;
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; RTC DEVICE FUNCTION DISPATCH ENTRY
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; A: RESULT (OUT), 0=OK, Z=OK, NZ=ERR
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; B: FUNCTION (IN)
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;
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EZ80RTC_DISPATCH:
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LD A,B ; GET REQUESTED FUNCTION
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AND $0F ; ISOLATE SUB-FUNCTION
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JP Z,EZ80RTC_GETTIM ; GET TIME
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DEC A
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JP Z,EZ80RTC_SETTIM ; SET TIME
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DEC A
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JP Z,EZ80RTC_GETBYT ; GET NVRAM BYTE VALUE
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DEC A
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JP Z,EZ80RTC_SETBYT ; SET NVRAM BYTE VALUE
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DEC A
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JP Z,EZ80RTC_GETBLK ; GET NVRAM DATA BLOCK VALUES
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DEC A
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JP Z,EZ80RTC_SETBLK ; SET NVRAM DATA BLOCK VALUES
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DEC A
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JP Z,EZ80RTC_GETALM ; GET ALARM
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DEC A
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JP Z,EZ80RTC_SETALM ; SET ALARM
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DEC A
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JP Z,EZ80RTC_DEVICE ; REPORT RTC DEVICE INFO
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SYSCHKERR(ERR_NOFUNC)
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RET
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;
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; RTC GET TIME
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; A: RESULT (OUT), 0=OK, Z=OK, NZ=ERR
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; HL: DATE/TIME BUFFER (OUT)
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; BUFFER FORMAT IS BCD: YYMMDDHHMMSS
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; 24 HOUR TIME FORMAT IS ASSUMED
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;
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EZ80RTC_GETTIM:
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PUSH HL
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LD HL, EZ80RTC_BCDBUF_EXT ; POINT TO BCD BUF EXTENDED
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LD A, 1 ; RTC FIRMWARE FUNCTION GROUP
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LD B, 1 ; READ DATE-TIME INTO (HL)
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EZ80_FN
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LD A, BID_BIOS ; COPY FROM BIOS BANK
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LD (HB_SRCBNK), A ; SET IT
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LD A, (HB_INVBNK) ; COPY TO CURRENT USER BANK
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LD (HB_DSTBNK), A ; SET IT
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LD HL, EZ80RTC_BCDBUF ; SOURCE ADR
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POP DE ; DEST ADR
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LD BC, EZ80RTC_BUFSIZ ; LENGTH
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CALL HB_BNKCPY ; COPY THE CLOCK DATA
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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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; RTC SET TIME
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; A: RESULT (OUT), 0=OK, Z=OK, NZ=ERR
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; HL: DATE/TIME BUFFER (IN)
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; BUFFER FORMAT IS BCD: YYMMDDHHMMSSWW
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; 24 HOUR TIME FORMAT IS ASSUMED
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;
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EZ80RTC_SETTIM:
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; COPY TO BCD BUF
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LD A,(HB_INVBNK) ; COPY FROM CURRENT USER BANK
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LD (HB_SRCBNK),A ; SET IT
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LD A,BID_BIOS ; COPY TO BIOS BANK
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LD (HB_DSTBNK),A ; SET IT
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LD DE,EZ80RTC_BCDBUF ; DEST ADR
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LD BC,EZ80RTC_BUFSIZ ; LENGTH
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CALL HB_BNKCPY ; COPY THE RPC DATA
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LD HL, EZ80RTC_BCDBUF_EXT ; POINT TO BCD BUF EXTENDED
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LD (HL), $20 ; CENTURY NOT SUPPORT BY HBIOS
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LD A, 1 ; RTC FIRMWARE FUNCTION GROUP
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LD B, 2 ; WRITE DATE-TIME FROM (HL)
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EZ80_FN
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XOR A ; SIGNAL SUCCESS
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RET
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;
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; RTC GET NVRAM BYTE
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; C: INDEX
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; E: VALUE (OUTPUT)
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; A:0 IF OK, ERR_RANGE IF OUT OF RANGE
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;
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EZ80RTC_GETBYT:
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SYSCHKERR(ERR_NOTIMPL)
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; XOR A ; SIGNAL SUCCESS
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RET ; AND RETURN
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; RTC SET NVRAM BYTE
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; C: INDEX
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; E: VALUE
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; A:0 IF OK, ERR_RANGE IF OUT OF RANGE
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;
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EZ80RTC_SETBYT:
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SYSCHKERR(ERR_NOTIMPL)
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; XOR A ; SIGNAL SUCCESS
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RET
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EZ80RTC_GETBLK:
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EZ80RTC_SETBLK:
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EZ80RTC_GETALM:
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EZ80RTC_SETALM:
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SYSCHKERR(ERR_NOTIMPL)
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RET
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;
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; REPORT RTC DEVICE INFO
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;
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EZ80RTC_DEVICE:
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LD D, RTCDEV_EZ80 ; D := DEVICE TYPE
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LD E, 0 ; E := PHYSICAL DEVICE NUMBER
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LD HL, 00 ; H := 0, DRIVER HAS NO MODES, L := 0, NO I/O ADDRESS
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XOR A ; SIGNAL SUCCESS
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RET
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; REGISTER EXTRACTED VALUES
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;
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EZ80RTC_BCDBUF_EXT:
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EZ80RTC_CN .DB 20 ; CENTURY
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EZ80RTC_BCDBUF:
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EZ80RTC_YR .DB 24
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EZ80RTC_MO .DB 01
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EZ80RTC_DT .DB 01
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EZ80RTC_HH .DB 00
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EZ80RTC_MM .DB 00
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EZ80RTC_SS .DB 00
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