;***************************************************************************
; 
; File Name		:'SERIAL.asm"
; Title			:Serial I/O
; Date			:98.07.21
; Version		:0.01
; Support telephone	:765 287 1987  David B. VanHorn
; Support fax		:765 287 1989
; Support Email		:dvanhorn@cedar.net
; Target MCU		:AT90S8515
;
; DESCRIPTION
;
;***************************************************************************
;	M O D I F I C A T I O N   H I S T O R Y 
;
;       rev.      date    who   why
;	----	--------  ---	------------------------------------------
;	0.01	98.07.29  dvh	Creation
;	0,02	98.08.29  dvh	Added break and "wait for char"
;	0.03	98.09.01  dvh	Working on making it more interrupt driven
;
;***************************************************************************
;I'm not really satisfied with this yet, I'm not having a lot of luck modeling
;a fully interrupt-driven comm scheme along with things like the "wait for char"
;feature. Also, there's a conflict if the output buffer fills up. There is just
;no good way to handle that as far as I can see. I always end up with a construct
;that loops forever and dosen't return to the main system. 
;
;Your input is most welcome here :)
;***************************************************************************************
;
Set_Baud_2400:

	ldi	TEMP,207	;
	rcall	SET_BAUD	;
	ret

Set_Baud_4800:

	ldi	TEMP,103	;
	rcall	SET_BAUD	;
	ret

Set_Baud_9600:

	ldi	TEMP,51		;
	rcall	SET_BAUD	;
	ret

Set_Baud_14400:

	ldi	TEMP,34		;
	rcall	SET_BAUD	;
	ret

Set_Baud_19200:

	ldi	TEMP,25		;
	rcall	SET_BAUD	;
	ret

Set_Baud_28800:

	ldi	TEMP,16		;Error is 2.1%
	rcall	SET_BAUD	;
	ret

Set_Baud_57600:

	ldi	TEMP,8		;Error is 3.7%
	rcall	SET_BAUD	;
	ret

Set_Baud_115200:

	ldi	TEMP,3		;Error is 7.8%
	rcall	SET_BAUD	;
	ret

Set_Baud:

	mov	LOOP,TEMP	;Save it for a moment
	rcall	WT4TXMT		;Wait till all prev sent data is gone
	out	UBRR,LOOP	;Set the baud rate
	ret			;
;
;************************************************************
;
;This one waits for TX buffer empty
;
WT4TXMT:
	rcall	Timed_Smack		;Reset the watchdog if needed
	rcall	SEROUT_Check		;returns # of bytes stored, in TEMP
	brne	WT4TXMT			;
	ret
;
;This one waits till the current char is done transmitting
;
WT4XCHR:
	rcall	Timed_Smack	;Reset watchdog if needed
	in	TEMP,USR	;
	andi	TEMP,$40	;Get the TX Complete bit
	breq	WT4XCHR		;
	ret
;
;************************************************************
;
Check_Serial_IN:

	rcall	SERIN_Check		;returns bytes stored, in TEMP
	breq	Check_Serial_IN_Done	;
	ldi	ZL,low(SERIAL_IN_BUF)	;Absolute pointer to head
	ldi	ZH,high(SERIAl_IN_BUF)	;
	ld	TEMP,Z+			;The head byte is junk
	ld	TEMP,Z			;If non-empty, then take a byte out of
					;serial_in_buf, and use it somehow

	and	TEMP,TEMP		;If non zero
	brne	Check_Serial_in_Full	;then let the serial in buffer fill

	;If zero returned, then the byte was stored, so kill it from
	;the serial in buf.

	ldi	ZL,low(SERIAL_IN_BUF)
	ldi	ZH,high(SERIAL_IN_BUF)
	lds	YL,(SERIAL_IN_TAIL)
	lds	YH,(SERIAL_IN_TAIL+1)
	rcall	Kill_Head		;Kill the sent byte
	sts	(SERIAL_IN_TAIL),YL	;
	sts	(SERIAL_IN_TAIL+1),YH	;
	rcall	HS_XON			;Since we ate a char, set HS to true if it was false
	ldi	TEMP,0			;
	ret

Check_Serial_In_Full:
	ldi	TEMP,$FF	;Failed exit

Check_Serial_IN_Done:
	ret
;
;************************************************************
;
;Set output handshaking.
;Toggled based on current status
;Jam XON or XOFF into output buffer
;
HS_XOFF:
	lds	TEMP,HS_FLAG	;
	and	TEMP,TEMP	;
	breq	Ser_HS_Done	;

	ldi	TEMP,XOFF	;Jam XOFF into serial out buffer
	rcall	Store_Serout	;Enable transmit (if not already)
	in	TEMP,UCR	;
	andi	TEMP,$7F	;
	out	UCR,TEMP	;Make sure no more data
	in	TEMP,UCR	;
	ori	TEMP,$20	;Turn on UDRIE
	out	UCR,TEMP	;in case it's off, so xoff and xon get sent
	ldi	TEMP,$00	;
	sts	HS_FLAG,TEMP	;
	rjmp 	SER_HS_Done	;

;
;************************************************************
;
HS_XON:
	lds	TEMP,HS_FLAG	;Get current status
	and 	TEMP,TEMP	;
	brne	Ser_HS_Done	;If non-zero, then it's already cleared

	ldi	TEMP,XON	;Jam XON into serial out buffer
	rcall	Store_Serout	;Enable transmit if not already
	in	TEMP,UCR	;
	ori	TEMP,$80	;
	out 	UCR,TEMP	;
	in	TEMP,UCR	;
	ori	TEMP,$20	;Turn on UDRIE
	out	UCR,TEMP	;in case it's off, so xoff and xon get sent
	ldi	TEMP,$FF	;
	sts	HS_FLAG,TEMP	;

Ser_HS_Done:
	ret
;
;************************************************************
;
SEND_BREAK:

	;Assumption, that you want anything placed in the serial buffer
	;to be sent before the break. 
	rcall	WT4TXMT		;Wait for serial buffer empty
	rcall	WT4XCHR		;Wait for the last char to get out

	;Shift the baud rate slightly lower.
	in	TEMP,UBRR	;Get the current baud rate (51 @ 9600)
	push	TEMP		;Save it
	mov	LOOP,TEMP	;Make a copy

	clc			;
	lsr	TEMP		;divide it by 8
	lsr	TEMP		;
	lsr	TEMP		;
	add	LOOP,TEMP	;Add that to the old value

	out	UBRR,LOOP	;Set the new baudrate, two "bits" slower

	ldi	TEMP,NUL	;Load a null, 8 bits of zero
	out	UDR,TEMP	;Start Breaking now.	

	rcall	WT4XCHR		;Wait till the char is sent

	pop	TEMP		;Get the old baud rate
	out	UBRR,TEMP	;Restore the original baud rate

	ret
;
;************************************************************
;
;Input: Char to get in temp, Delay in TEMP2
;Output: TEMP2=0 for ok, or FF for timeout or wrong char
;
WT4CHAR: ;This starts the Serial_Wait engine to look for an incoming char.
	
	sts	Char_Time,TEMP2	;System will decrement on 1mS system ticks
	sts	Watch_Char,TEMP	;save temp for compare
	;Turn off inbound serial ints
	ret			;

;Char_Time = 0, Not waiting, or timed out.
;Char_Time <> 0, actively waiting.
;Watch_Char = byte value waiting on.
;


Serial_Wait:
	lds	TEMP,Char_Time	;Are we waiting on a char (0=no)
	and	TEMP,TEMP	;Is Char_Time=0?
	brne	WT4CHAR_ACTIVE	;If not, then we're waiting
	ret			;Else return

	;If we're waiting, then see if it's happened

WT4CHAR_ACTIVE:
	in	TEMP,USR	;Did we get a char yet?
	andi	TEMP,$80	;Check bit 7
	brne	WT4CHAR_GOTIT	;
	ret			;Nope, just keep waiting

WT4CHAR_GOTIT:

	in	TEMP2,UDR	;Get the Char
	andi	TEMP2,$7F	;Mask off parity(?)
	lds	TEMP,Watch_Char	;What were we looking for?
	cp	TEMP,TEMP2	;Is this it?
	breq	WT4CHAR_SUCCESS	;

WT4CHAR_SUCCESS:
	ret


;
;***************************************************************************************
;
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