Commit partial changes. vars should be DS

bme280_util.z80

@@ -14,6 +14,12 @@ bdos	equ	0005h
 conout  equ	02h
 conin	equ	01h
 
+char_idx	equ	10h
+
+temperature	equ	20h
+humidity	equ	30h
+pressure	equ	40h
+
 start:
 	call	init_lcd
 	call	init_siob
@@ -39,7 +45,8 @@ start:
 
 main:
 	call	read_char_b
-	call	print_char_to_lcd
+	call	parse_char
+	;call	print_char_to_lcd
 	ld	c,11
 	call	bdos
 	or	a
@@ -88,6 +95,9 @@ delay1:
 	jr	nz,delay1
 	ret
 
+convert_to_hpa:
+	ld	a,(pressure)
+
 read_char_b:
 wait:
 	in	a,(siob_ctrl)
@@ -97,7 +107,63 @@ wait:
 	in	a,(siob_data)
 	ret
 
+parse_char:	; char should be in register a
+	cp	a,25h	; percent sign (end of transmission)
+	jr	z,print_telem_to_lcd
+	cp	a,0dh	; carriage return
+	jr	z,null_term
+	cp	a,0ah	; new line
+	jr	z,parse_char_done
+	cp	a,054h	; T character
+	jr	z,set_char_idx_t	; point the char_idx to the temperature buffer
+	cp	a,050h	; P character
+	jr	z,set_char_idx_p	; point the char_idx to the pressure buffer
+	cp	a,048h	; H character
+	jr	z,set_char_idx_h	; point the char_idx to the humidity buffer
+	
+	ld	bc,(char_idx)	; get address stored in char_idx
+	ld	(bc),a		; deref that address and store char
+	inc	bc
+	ld	(char_idx),bc	; store incremented address in char_idx
+
+	;out	(lcd_data),a
+parse_char_done:
+	ret
+
+print_telem_to_lcd:
+	call	move_to_tempaddr
+	ld	hl,temperature
+	call	print_str_to_lcd
+	ld	a,1h
+	out	(0),a
+	ret
+
+null_term:	; null terminate end of parsed string in memory
+	ld	a,00h
+	ld	bc,(char_idx)
+	ld	(bc),a
+	jr	parse_char_done
+
+
+set_char_idx_t:
+	ld	bc,temperature
+	ld	(char_idx),bc
+	ret
+
+set_char_idx_p:
+	ld	bc,pressure
+	ld	(char_idx),bc
+	ret
+
+set_char_idx_h:
+	ld	bc,humidity
+	ld	(char_idx),bc
+	ret
+
+
 print_char_to_lcd:
+	cp	a,00h	; null byte
+	jr	z,lcd_done
 	cp	a,0dh	; carriage return
 	jr	z,lcd_done
 	cp	a,0ah	; new line
@@ -141,12 +207,6 @@ move_to_humidaddr:
 	out	(lcd_ctrl),a
 	ret
 
-print_char:
-	ld	e,a
-	ld	c,conout
-	call	bdos
-	ret
-
 clabel: DB 'degree C',0
 plabel: DB 'pascal',0
 hlabel: DB '% RH',0