RP5C01: Added support for read/write nvram byte and detect board present

Source/HBIOS/rp5rtc.asm

@@ -10,12 +10,18 @@ RP5RTC_BUFSIZ	.EQU	6	; SIX BYTE BUFFER (YYMMDDHHMMSS)
 
 ; TODO:
 ; set the day of week register
-; read from nvram
-; write to nvram
 ; read block of nvram
 ; write block of nvram
 ; set alarm/get alarm????
 
+;; NOTES FOR USING DRIVER IN Z-DOS
+; First load the LDDS datestamper
+; A:LDDS
+; next prepare and drives with datestamper info:
+; eg: a:putds -d=g: -V
+; then view date time of files with:
+; a:filedate
+
 
 RP5RTC_REG	.EQU	$B4
 RP5RTC_DAT	.EQU	$B5
@@ -46,35 +52,46 @@ MODE_ALRMST	.EQU	1
 MODE_RAM0	.EQU	2
 MODE_RAM1	.EQU	3
 
-MD_TIME	.EQU	8
-MD_ALRM	.EQU	4
+MD_TIME		.EQU	8
+MD_ALRM		.EQU	4
 
 RP5RTC_INIT:
-	LD	A,(RTC_DISPACT)		; RTC DISPATCHER ALREADY SET?
+	LD	A, (RTC_DISPACT)	; RTC DISPATCHER ALREADY SET?
 	OR	A			; SET FLAGS
 	RET	NZ			; IF ALREADY ACTIVE, ABORT
-;
-	CALL	NEWLINE		; FORMATTING
+
+	CALL	NEWLINE			; FORMATTING
 	PRTS("RP5C01 RTC: $")
-;
 
+	; PRINT RTC LATCH PORT ADDRESS
+	PRTS("IO=0x$")			; LABEL FOR IO ADDRESS
+	LD	A,RP5RTC_REG		; GET IO ADDRESS
+	CALL	PRTHEXBYTE		; PRINT IT
+        CALL    PC_SPACE                ; FORMATTING
+
+	; CHECK PRESENCE STATUS
+	CALL	RP5RTC_DETECT		; HARDWARE DETECTION
+	JR	Z, RP5RTC_INIT1		; IF ZERO, ALL GOOD
+	PRTS("NOT PRESENT$")		; NOT ZERO, H/W NOT PRESENT
+	OR	$FF			; SIGNAL FAILURE
+	RET				; BAIL OUT
+
+RP5RTC_INIT1:
 ;	ENSURE DEVICE IS RESET AND NOT IN TEST MODE
-	LD	A, REG_TEST			; SELECT TEST REGISTER
+	LD	A, REG_TEST		; SELECT TEST REGISTER
 	OUT	(RP5RTC_REG), A
 	CALL	DLY16
 	XOR	A
-	OUT	(RP5RTC_DAT), A			; TURN OFF ALL TEST MODE BITS
-
+	OUT	(RP5RTC_DAT), A		; TURN OFF ALL TEST MODE BITS
 
 	LD	B, MODE_ALRMST
 	CALL	RP5RTC_SETMD
 
-	LD	A, REG_12_24			; SET TO 24 HOUR CLOCK
+	LD	A, REG_12_24		; SET TO 24 HOUR CLOCK
 	OUT	(RP5RTC_REG), A
 	LD	A, 1
 	OUT	(RP5RTC_DAT), A
 
-
 	CALL	RP5RTC_RDTIM
 
 	; DISPLAY CURRENT TIME
@@ -84,7 +101,36 @@ RP5RTC_INIT:
 	LD	BC, RP5RTC_DISPATCH
 	CALL	RTC_SETDISP
 ;
-	XOR	A		; SIGNAL SUCCESS
+	XOR	A			; SIGNAL SUCCESS
+	RET
+;
+; DETECT RTC HARDWARE PRESENCE
+;
+RP5RTC_DETECT:
+	LD	C, 0			; NVRAM INDEX 0
+	CALL	RP5RTC_GETBYT		; GET VALUE
+	LD	A, E			; TO ACCUM
+	LD	L, A			; SAVE IT
+	XOR	$FF			; FLIP ALL BITS
+	LD	E, A			; TO E
+	LD	C, 0			; NVRAM INDEX 0
+	CALL	RP5RTC_SETBYT		; WRITE IT
+	LD	C, 0			; NVRAM INDEX 0
+	CALL	RP5RTC_GETBYT		; GET VALUE
+	LD	A, L			; GET SAVED VALUE
+	XOR	$FF			; FLIP ALL BITS
+	CP	E			; COMPARE WITH VALUE READ
+	LD	A, 0			; ASSUME OK
+	JR	Z, RP5RTC_DETECT1	; IF MATCH, GO AHEAD
+	LD	A, $FF			; ELSE STATUS IS ERROR
+
+RP5RTC_DETECT1:
+	PUSH	AF			; SAVE STATUS
+	LD	A, L			; GET SAVED VALUE
+	LD	C, 0 			; NVRAM INDEX 0
+	CALL	RP5RTC_SETBYT		; SAVE IT
+	POP	AF			; RECOVER STATUS
+	OR	A			; SET FLAGS
 	RET
 ;
 ; RTC DEVICE FUNCTION DISPATCH ENTRY
@@ -92,40 +138,108 @@ RP5RTC_INIT:
 ;   B: FUNCTION (IN)
 ;
 RP5RTC_DISPATCH:
-	LD	A,B		; GET REQUESTED FUNCTION
-	AND	$0F		; ISOLATE SUB-FUNCTION
-	JP	Z,RP5RTC_GETTIM	; GET TIME
+	LD	A,B			; GET REQUESTED FUNCTION
+	AND	$0F			; ISOLATE SUB-FUNCTION
+	JP	Z,RP5RTC_GETTIM		; GET TIME
 	DEC	A
-	JP	Z,RP5RTC_SETTIM	; SET TIME
+	JP	Z,RP5RTC_SETTIM		; SET TIME
 	DEC	A
-	JP	Z,RP5RTC_GETBYT	; GET NVRAM BYTE VALUE
+	JP	Z,RP5RTC_GETBYT		; GET NVRAM BYTE VALUE
 	DEC	A
-	JP	Z,RP5RTC_SETBYT	; SET NVRAM BYTE VALUE
+	JP	Z,RP5RTC_SETBYT		; SET NVRAM BYTE VALUE
 	DEC	A
-	JP	Z,RP5RTC_GETBLK	; GET NVRAM DATA BLOCK VALUES
+	JP	Z,RP5RTC_GETBLK		; GET NVRAM DATA BLOCK VALUES
 	DEC	A
-	JP	Z,RP5RTC_SETBLK	; SET NVRAM DATA BLOCK VALUES
+	JP	Z,RP5RTC_SETBLK		; SET NVRAM DATA BLOCK VALUES
 	DEC	A
-	JP	Z,RP5RTC_GETALM	; GET ALARM
+	JP	Z,RP5RTC_GETALM		; GET ALARM
 	DEC	A
-	JP	Z,RP5RTC_SETALM	; SET ALARM
+	JP	Z,RP5RTC_SETALM		; SET ALARM
 	DEC	A
-	JP	Z,RP5RTC_DEVICE	; REPORT RTC DEVICE INFO
+	JP	Z,RP5RTC_DEVICE		; REPORT RTC DEVICE INFO
 	CALL	SYSCHK
-	LD	A,ERR_NOFUNC
+	LD	A, ERR_NOFUNC
 	OR	A
 	RET
 ;
-; NVRAM FUNCTIONS ARE NOT AVAILABLE IN SIMULATOR
+; RTC GET NVRAM BYTE
+;   C: INDEX
+;   E: VALUE (OUTPUT)
+;   A:0 IF OK, ERR_RANGE IF OUT OF RANGE
 ;
 RP5RTC_GETBYT:
+	LD	A, C
+	CP	$0D
+	JR	NC, RP5RTC_BADIDX
+
+	LD	B, MODE_RAM0
+	CALL	RP5RTC_SETMD
+	LD	A, C			; SELECT NVRAM INDEX
+	OUT	(RP5RTC_REG), A
+	IN	A, (RP5RTC_DAT)
+	AND	$0F			; RETRIEVE UNIT NIBBLE
+	LD	E, A
+
+	LD	B, MODE_RAM1
+	CALL	RP5RTC_SETMD
+	LD	A, C			; SELECT NVRAM INDEX
+	OUT	(RP5RTC_REG), A
+	IN	A, (RP5RTC_DAT)
+	AND	$0F			; RETRIEVE UNIT NIBBLE
+	RLCA
+	RLCA
+	RLCA
+	RLCA
+	OR	E
+	LD	E, A
+
+	XOR	A			; SIGNAL SUCCESS
+	RET				; AND RETURN
+
+RP5RTC_BADIDX:
+	LD	E, 00
+	LD	A, ERR_RANGE
+	RET
+;
+; RTC SET NVRAM BYTE
+;   C: INDEX
+;   E: VALUE
+;   A:0 IF OK, ERR_RANGE IF OUT OF RANGE
+;
 RP5RTC_SETBYT:
+	LD	A, C
+	CP	$0D
+	JR	NC, RP5RTC_BADIDX
+
+	LD	B, MODE_RAM0
+	CALL	RP5RTC_SETMD
+	LD	A, C			; SELECT NVRAM INDEX
+	OUT	(RP5RTC_REG), A
+	LD	A, E
+	AND	$0F
+	OUT	(RP5RTC_DAT), A
+
+	LD	B, MODE_RAM1
+	CALL	RP5RTC_SETMD
+	LD	A, C			; SELECT NVRAM INDEX
+	OUT	(RP5RTC_REG), A
+	LD	A, E
+	AND	$F0
+	RRCA
+	RRCA
+	RRCA
+	RRCA
+	OUT	(RP5RTC_DAT), A
+
+	XOR	A			; SIGNAL SUCCESS
+	RET				; AND RETURN
+
 RP5RTC_GETBLK:
 RP5RTC_SETBLK:
 RP5RTC_GETALM:
 RP5RTC_SETALM:
+	LD	A, ERR_NOTIMPL
 	CALL	SYSCHK
-	LD	A,ERR_NOTIMPL
 	OR	A
 	RET
 ;
@@ -322,5 +436,3 @@ RP5RTC_HH	.DB	00
 RP5RTC_MM	.DB	00
 RP5RTC_SS	.DB	00
 
-RP5RTC_DW	.DB	00	; THE DAY OF THE WEEK
-RP5RTC_LP	.DB	00	; 1 IF IS LEAP YEAR, OTHERWISE 0