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LCD_4bit_LPC9351.inc
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LCD_4bit_LPC9351.inc
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cseg
; When using a 7.373MHz clock
; one cycle takes 2.0/7.373MHz = 271.26 ns
;---------------------------------;
; Wait 40 microseconds ;
;---------------------------------;
Wait40uSec:
push AR0
mov R0, #74
L0:
djnz R0, L0 ; 2 cycles->2*271.26ns*74=40us
pop AR0
ret
;---------------------------------;
; Wait 'R2' milliseconds ;
;---------------------------------;
Wait_Milli_Seconds mac
push AR2
mov R2, %0
lcall ?Wait_Milli_Seconds
pop AR2
endmac
?Wait_Milli_Seconds:
push AR0
push AR1
L3: mov R1, #10
L2: mov R0, #184
L1: djnz R0, L1 ; 2 cycles->2*271.26ns*184=100us
djnz R1, L2 ; 100us*10=1ms
djnz R2, L3 ; number of millisecons to wait passed in R2
pop AR1
pop AR0
ret
;---------------------------------;
; Wait Half Second ;
;---------------------------------;
WaitHalfSec:
mov R2, #20
L6: mov R1, #250
L5: mov R0, #184
L4: djnz R0, L4 ; 2 machine cycles-> 2*0.27126us*184=100us
djnz R1, L5 ; 100us*250=0.025s
djnz R2, L6 ; 0.025s*20=0.5s
ret
;---------------------------------;
; Toggles the 'E' pin in the LCD ;
;---------------------------------;
LCD_pulse:
setb LCD_E
lcall Wait40uSec
clr LCD_E
lcall Wait40uSec
ret
;---------------------------------;
; Writes acc to LCD in 4-bit mode ;
;---------------------------------;
LCD_byte:
; Write high 4 bits first
mov c, ACC.7
mov LCD_D7, c
mov c, ACC.6
mov LCD_D6, c
mov c, ACC.5
mov LCD_D5, c
mov c, ACC.4
mov LCD_D4, c
lcall LCD_pulse
; Write low 4 bits next
mov c, ACC.3
mov LCD_D7, c
mov c, ACC.2
mov LCD_D6, c
mov c, ACC.1
mov LCD_D5, c
mov c, ACC.0
mov LCD_D4, c
lcall LCD_pulse
ret
;---------------------------------;
; Write data to LCD ;
;---------------------------------;
WriteData mac
mov a, %0
lcall ?WriteData
endmac
?WriteData:
setb LCD_RS
ljmp LCD_byte
;---------------------------------;
; Write command to LCD ;
;---------------------------------;
WriteCommand mac
mov a, %0
lcall ?WriteCommand
endmac
?WriteCommand:
clr LCD_RS
ljmp LCD_byte
;---------------------------------;
; Configure LCD in 4-bit mode ;
;---------------------------------;
LCD_4BIT:
clr LCD_E ; Resting state of LCD's enable pin is zero
clr LCD_RW ; We are only writing to the LCD in this program
; After power on, let the LCD start up before initializing
Wait_Milli_Seconds(#40)
; First make sure the LCD is in 8-bit mode and then change to 4-bit mode
WriteCommand(#0x33)
WriteCommand(#0x33)
WriteCommand(#0x32) ; change to 4-bit mode
; Configure the LCD
WriteCommand(#0x28)
WriteCommand(#0x0c)
WriteCommand(#0x01) ; Clear screen command (takes some time)
;Wait for the clear screen command to finish.
Wait_Milli_Seconds(#2)
ret
;---------------------------------;
; Send a constant string to LCD ;
;---------------------------------;
Send_Constant_String mac
push dph
push dpl
push acc
mov dptr, %0
lcall ?Send_Constant_String
pop acc
pop dpl
pop dph
endmac
?Send_Constant_String:
clr a
movc a, @a+dptr
jz ?Send_Constant_String_Done
lcall ?WriteData
inc dptr
sjmp ?Send_Constant_String
?Send_Constant_String_Done:
ret
;---------------------------------;
; Set LCD cursor at row, column ;
;---------------------------------;
Set_Cursor mac
push acc
mov a, #%1
dec a
lcall ?Set_Cursor_%0 ; Select column and row
pop acc
endmac
?Set_Cursor_2:
orl a, #01000000B
?Set_Cursor_1:
orl a, #10000000B
ljmp ?WriteCommand ; Select column and row
;---------------------------------;
; Display a BCD number in the LCD ;
;---------------------------------;
Display_BCD mac
push ar0
mov r0, %0
lcall ?Display_BCD
pop ar0
endmac
?Display_BCD:
push acc
; Write most significant digit
mov a, r0
swap a
anl a, #0fh
orl a, #30h
lcall ?WriteData
; write least significant digit
mov a, r0
anl a, #0fh
orl a, #30h
lcall ?WriteData
pop acc
ret
;------------------------------------;
; Display a char in the LCD ;
;------------------------------------;
Display_char mac
push acc
mov a, %0
lcall ?WriteData
pop acc
endmac
;------------------------------------;
; Display on LCD ;
;------------------------------------;
Display_Soak:
Set_Cursor(1, 7)
Display_BCD(SoakTemp)
Set_Cursor(1, 5)
Display_BCD(SoakTemp+1)
Set_Cursor(1, 1)
Send_Constant_String(#_Soak)
Set_Cursor(1, 11)
Display_BCD(SoakMinAlarm)
Set_Cursor(1, 14)
Display_BCD(SoakSecAlarm)
ret
Display_Refl:
Set_Cursor(2, 7)
Display_BCD(ReflTemp)
Set_Cursor(2, 5)
Display_BCD(ReflTemp+1)
Set_Cursor(2, 1)
Send_Constant_String(#_Refl)
Set_Cursor(2, 11)
Display_BCD(ReflMinAlarm)
Set_Cursor(2, 14)
Display_BCD(ReflSecAlarm)
ret
Display_SoakTimer:
Set_Cursor(1, 11)
Display_BCD(BCD_counterMin)
Set_Cursor(1, 14)
Display_BCD(BCD_counterSec)
ljmp Forever
Display_ReflTimer:
Set_Cursor(2, 11)
Display_BCD(BCD_counterMin)
Set_Cursor(2, 14)
Display_BCD(BCD_counterSec)
ljmp Forever
WriteNum:
;check refltimer_done if update soak or refl time
jnb refltimer_done, Display_SoakTimer ; if in soak stage, update soak display
jb refltimer_done, Display_ReflTimer ; if in refl stage, update refl display
; jumps to Forever after display
;------------------------------------;
; Displays ;
;------------------------------------;
;------- show current temperature --------;
TempDisplay:
setb tempdisplay_flag
Set_Cursor(1,1)
Send_Constant_String(#_clearLCD)
Set_Cursor(2,1)
Send_Constant_String(#_clearLCD)
Set_Cursor(1,1)
Send_Constant_String(#_Temperature_LCD)
;Set_Cursor(1,6)
;Display_BCD(currentTemp)
Set_Cursor(2,1)
Send_Constant_String(#_Power)
Set_Cursor(2,8)
Display_BCD(Display_Power)
;----------- DISPLAY TEMP --------------;
; push acc
; lcall Wait_Sec
; pop acc
clr a
mov x+0,Result+0
mov x+1,Result+1
mov x+2,a
mov x+3,a
;PRINTS RESULT TEMPERATURE IN TOP LEFT
lcall hex2bcd
push acc
Set_cursor (1,6) ;print to the lcd
pop acc
lcall LCD_3BCD
push acc
WriteData(#'C')
pop acc
clr a
mov x+0,LM_TEMP+0
mov x+1,LM_TEMP+1
mov x+2,a
mov x+3,a
;PRINTS TEMPERATURE FROM LM335 (ROOM TEMP) IN BOTTOM LEFT
lcall hex2bcd
push acc
Set_cursor (1,12) ;print to the lcd
pop acc
lcall LCD_3BCD
push acc
WriteData(#'C')
pop acc
clr a
mov x+0,TC_Result+0
mov x+1,TC_Result+1
mov x+2,a
mov x+3,a
;PRINTS THERMOCOUPLE TEMPERATURE ON BOTTOM RIGHT
; lcall hex2bcd
; push acc
; Set_cursor (2,6) ;print to the lcd
; pop acc
; lcall LCD_3BCD
; push acc
; WriteData(#'C')
; pop acc
ljmp Forever
;-------------- show timers ---------------;
TimerDisplay:
clr tempdisplay_flag
Set_Cursor(1,1)
Send_Constant_String(#_clearLCD)
Set_Cursor(1,2)
Send_Constant_String(#_clearLCD)
Set_Cursor(1,1)
Send_Constant_String(#_Soak)
Set_Cursor(1,6)
Send_Constant_String(#_C)
Set_Cursor(1,10)
Send_Constant_String(#_blank)
Set_Cursor(1,11)
Send_Constant_String(#_default)
Set_Cursor(2,1)
Send_Constant_String(#_Refl)
Set_Cursor(2,6)
Send_Constant_String(#_C)
Set_Cursor(2,10)
Send_Constant_String(#_blank)
Set_Cursor(2,11)
Send_Constant_String(#_default)
lcall Display_Soak
lcall Display_Refl
ljmp Forever
;ret
TempDisplay2:
setb tempdisplay_flag
Set_Cursor(1,1)
Send_Constant_String(#_clearLCD)
Set_Cursor(2,1)
Send_Constant_String(#_clearLCD)
Set_Cursor(1,1)
Send_Constant_String(#_Temperature_LCD)
;Set_Cursor(1,6)
;Display_BCD(currentTemp)
Set_Cursor(2,1)
Send_Constant_String(#_Power)
Set_Cursor(2,8)
Display_BCD(Display_Power)
;----------- DISPLAY TEMP --------------;
; push acc
; lcall Wait_Sec
; pop acc
clr a
mov x+0,Result+0
mov x+1,Result+1
mov x+2,a
mov x+3,a
;PRINTS RESULT TEMPERATURE IN TOP LEFT
lcall hex2bcd
push acc
Set_cursor (1,6) ;print to the lcd
pop acc
lcall LCD_3BCD
push acc
WriteData(#'C')
pop acc
clr a
mov x+0,LM_TEMP+0
mov x+1,LM_TEMP+1
mov x+2,a
mov x+3,a
;PRINTS TEMPERATURE FROM LM335 (ROOM TEMP) IN BOTTOM LEFT
lcall hex2bcd
push acc
Set_cursor (1,12) ;print to the lcd
pop acc
lcall LCD_3BCD
push acc
WriteData(#'C')
pop acc
clr a
mov x+0,TC_Result+0
mov x+1,TC_Result+1
mov x+2,a
mov x+3,a
;PRINTS THERMOCOUPLE TEMPERATURE ON BOTTOM RIGHT
; lcall hex2bcd
; push acc
; Set_cursor (2,6) ;print to the lcd
; pop acc
; lcall LCD_3BCD
; push acc
; WriteData(#'C')
; pop acc
ljmp SwitchDisplay_S1
;-------------- show timers ---------------;
TimerDisplay2:
clr tempdisplay_flag
Set_Cursor(1,1)
Send_Constant_String(#_clearLCD)
Set_Cursor(1,2)
Send_Constant_String(#_clearLCD)
Set_Cursor(1,1)
Send_Constant_String(#_Soak)
Set_Cursor(1,6)
Send_Constant_String(#_C)
Set_Cursor(1,10)
Send_Constant_String(#_blank)
Set_Cursor(1,11)
Send_Constant_String(#_default)
Set_Cursor(2,1)
Send_Constant_String(#_Refl)
Set_Cursor(2,6)
Send_Constant_String(#_C)
Set_Cursor(2,10)
Send_Constant_String(#_blank)
Set_Cursor(2,11)
Send_Constant_String(#_default)
lcall Display_Soak
lcall Display_Refl
ljmp SwitchDisplay_S1
;ret