How to display dot on 7-seg , 4 digit

[chai98a]

Hi paul borgmeier
Now I try to show temp with DS1820 on 7 seg 4 digit
Below is code , I can read data temp from ds1820 and send to RS232 -->OK but canot to diplay to 7 Seg. Ex 29.05C

Code :
Define LOADER_USED 1
DEFINE OSC 4
@ Device pic16F877, xt_OSC, BOD_OFF, PWRT_ON, WDT_OFF, PROTECT_OFF,WRT_ON

Segments Var PORTC
Digits Var PORTD

i Var Byte
n Var Byte
Value Var Word


TRISc = $00 ' Set segment pins to output
TRISd = $f0 ' Set digit pins to output


' Allocate variables
command var byte ' Storage for command
J var byte ' Storage for loop counter
temp var word ' Storage for temperature
DQ var PORTd.4 ' Alias DS1820 data pin
DQ_DIR var TRISd.4 ' Alias DS1820 data direction pin

TRISc = $00 ' Set segment pins to output
TRISd = $f0 ' Set digit pins to output
TrisB = $00
Portb = $00
OPTION_REG = $55 ' Set TMR0 configuration 1:64
INTCON = $A0 ' Enable TMR0 interrupts
On Interrupt Goto display

ADCON1 = 7 ' Set PORTA and PORTE to digital

' Lcdout $fe, 1, "Temp in degrees C" ' Display sign-on message
'debug ====
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_SPBRG 12 ' 19200 Bauds ,4 m
'debug ====

' Mainloop to read the temperature and display on LCD
mainloop:
Gosub init1820 ' Init the DS1820

command = $cc ' Issue Skip ROM command
Gosub write1820

command = $44 ' Start temperature conversion
Gosub write1820

Pause 2000 ' Wait 2 seconds for conversion to complete

Gosub init1820 ' Do another init

command = $cc ' Issue Skip ROM command
Gosub write1820

command = $be ' Read the temperature
Gosub write1820
Gosub read1820

'Display the decimal temperature
'Lcdout $fe, 1, dec (temp >> 1), ".", dec (temp.0 * 5), " degrees C"
'HSEROUT ["Temp = ",dec (temp>>1),".", dec (temp.0*5)," C",13,10]
Goto mainloop ' Do it forever


' Initialize DS1820 and check for presence
init1820:
Low DQ ' Set the data pin low to init
Pauseus 500 ' Wait > 480us
DQ_DIR = 1 ' Release data pin (set to input for high)

Pauseus 100 ' Wait > 60us
If DQ = 1 Then
'Lcdout $fe, 1, "DS1820 not present"
Pause 500
Goto mainloop ' Try again
Endif
Pauseus 400 ' Wait for end of presence pulse
Return


' Write "command" byte to the DS1820
write1820:
For j = 1 to 8 ' 8 bits to a byte
If command.0 = 0 Then
Gosub write0 ' Write a 0 bit
Else
Gosub write1 ' Write a 1 bit
Endif
command = command >> 1 ' Shift to next bit
Next j
Return

' Write a 0 bit to the DS1820
write0:
Low DQ
Pauseus 60 ' Low for > 60us for 0
DQ_DIR = 1 ' Release data pin (set to input for high)
Return

' Write a 1 bit to the DS1820
write1:
Low DQ ' Low for < 15us for 1
@ nop ' Delay 1us at 4MHz
DQ_DIR = 1 ' Release data pin (set to input for high)
Pauseus 60 ' Use up rest of time slot
Return


' Read temperature from the DS1820
read1820:
For J = 1 to 16 ' 16 bits to a word
temp = temp >> 1 ' Shift down bits
Gosub readbit ' Get the bit to the top of temp
Next J
Return

' Read a bit from the DS1820
readbit:
temp.15 = 1 ' Preset read bit to 1
Low DQ ' Start the time slot
@ nop ' Delay 1us at 4MHz
DQ_DIR = 1 ' Release data pin (set to input for high)
If DQ = 0 Then
temp.15 = 0 ' Set bit to 0
Endif
Pauseus 60 ' Wait out rest of time slot
Return

'================== 7 seg ment display ==============================
disable
display:
INTCON.2 = 0 'clear the interrupt flag

VALUE = (temp >>1)+(temp.0 * 5)

For i = 0 To 3 ' Loop through 4 digits
n = Value Dig i ' Get digit to display
Gosub display1 ' Display the value
NEXT I

goto mainloop

display1:
Digits = $ff ' All digits off to prevent ghosting

' Convert binary number in n to segments for LED
' COM ANODE 1234567890
Lookup n, [$3F,$06, $5B, $4F, $66, $6D, $7D, $07, $7F, $6F, $77, $7C, $39, $5E, $79, $71], Segments
' Set digit pin i to 0 (on) and the rest of the pins to 1 (off)

Digits = ~Dcd i

Return
enable
End