Rc int on 16f874

**hakan** · - 14th July 2007, 20:09

Hello!
I'm trying to connect to my PIC via a interupt on receivd rs232. The hardware is connected as attachment "Hardware Setup.jpg" (MicroCodeLoader).
My problem is when I try to connect nothing happends.

Here is my code:
<PBP COD>
DEFINE LOADER_USED 1
' Set X-tal to 4 MHz
DEFINE OSC 4

DEFINE HSER_RCSTA 90h 'Hser receive status init
DEFINE HSER_TXSTA 20h 'Hser transmit status init
DEFINE HSER_BAUD 2400 'Hser baud rate

---

SPBRG = 25'103 'SET TO 2400bps

On Interrupt Goto myint ' Define interrupt handler
INTCON = $C0 ' Enable INTE interrupt
PIE1.5 = 1

---

' Interrupt handler
Disable ' No interrupts past this point
myint:
PIR1.5 = 0
lcdout $FE, LcdLine2, " Connected "
pause 1000

Resume ' Return to main program
Enable

end

</PBP COD>

Whats wrong? I can't get it to work!
Pleas help me.

Regards

Håkan
( I hope you can understand my por english and code)

**mister_e** · - 14th July 2007, 20:15

we will need to see your whole code first... sure there's few things missing here..

**hakan** · - 14th July 2007, 20:30

OK, here is my entire code.
I have a 2*16 LCD, a button and a shaft encoder connected.

Regards
Håkan

DEFINE LOADER_USED 1
' Set X-tal to 4 MHz
DEFINE OSC 4

DEFINE HSER_RCSTA 90h 'Hser receive status init
DEFINE HSER_TXSTA 20h 'Hser transmit status init
DEFINE HSER_BAUD 2400 'Hser baud rate

' Set LCD Data port
DEFINE LCD_DREG PORTB
' Set starting Data bit (0 or 4) if 4-bit bus
DEFINE LCD_DBIT 0
' Set LCD Register Select port
DEFINE LCD_RSREG PORTB
' Set LCD Register Select bit
DEFINE LCD_RSBIT 7
'LCD read/write port
DEFINE LCD_RWREG PORTB
'LCD read/write bit
DEFINE LCD_RWBIT 6
' Set LCD Enable port
DEFINE LCD_EREG PORTB
' Set LCD Enable bit
DEFINE LCD_EBIT 5
' Set LCD bus size (4 or 8 bits)
DEFINE LCD_BITS 4
' Set number of lines on LCD
DEFINE LCD_LINES 2
' Set command delay time in us
DEFINE LCD_COMMANDUS 2000
' Set data delay time in us
DEFINE LCD_DATAUS 50

SPBRG = 25'103 'SET TO 2400bps

On Interrupt Goto myint ' Define interrupt handler
INTCON.6 = 1' = $C0 ' Enable INTE interrupt
PIE1.5 = 1

' Shaft Encoder
clock var PORTD.0
stat var PORTD.1
' Button
exec var PORTD.2
' ICD
txPin var PORTC.6
rxPin Var PORTC.7
' LCD background
LED var PORTD.3

T2400 CON 396'1021
Inverted CON $4000
Baud CON T2400 '+ Inverted

LcdCls CON $01 ' clear the LCD
LcdLine1 CON $80 ' DDRAM address of line 1
LcdLine2 CON $C0 ' DDRAM address of line 2

countPulses VAR Byte
print VAR Bit
a VAR Byte
b VAR Byte
c var byte
idx var byte
turnOff VAR Bit
failSafe VAR Byte

'Init EE
read $00,a
if a <> 0 then
' First digit --> Delay when turnig off
' Second digit --> Card
' Therd digit --> Relay

' ALL system
write 2,$A ' --> Start adr
write 3,$D ' --> Stop adr

write $A, 11
write $B, 12
write $C, 114
write $D, 16

' Main Sound --> Mixerboard, eq, Ampl.

' Sub Sound --> Only Mixer and Eq etc.

' Main Displ --> Display Comp., screens and Projector

' Sub Displ --> Only Display Comp. and Screens
write $00, $1
endif

PAUSE 1000 ' Wait for LCD to startup

countpulses = 1
turnOff = 0
print = 0

high led

main:

GOSUB readpuls
GOSUB writeDisp
GOSUB readExec
GOTO main

'**************************

'**************************
writeDisp:
IF (print) THEN
SELECT case countPulses

CASE 1
lcdout $FE, LcdCls, "Start ALL Syst. "
CASE 2
lcdout $FE, LcdCls, "Main Sound Syst."
CASE 3
lcdout $FE, LcdCls, "Sub Sound Syst. "
CASE 4
lcdout $FE, LcdCls, "Main Disp System"
CASE 5
lcdout $FE, LcdCls, "Sub Disp System "

CASE ELSE
lcdout $FE, LcdCls, " Illigal value "
END SELECT

Print = 0
ENDIF
RETURN

'**************************

'**************************
readExec:
IF (exec = 0) THEN

lcdout $FE, LcdLine2, " Starting Up "
gosub set
GOSUB logOff
lcdout $FE, LcdLine2, " Shuting Down "
gosub clr
lcdout $FE, LcdLine2, " "

ENDIF

RETURN

' '**************************

' '**************************
readPuls:
IF(clock = 0) THEN
IF (stat) THEN
countpulses = ((countpulses - 1)//5)+1'(countpulses - 1) MIN 1'((countpulses - 1)//5)
ELSE
countpulses = ((countpulses + 1)//5)+1'(countpulses + 1) MAX 5'((countpulses + 1)//5)
ENDIF
print = 1
again: IF clock = 0 THEN GOTO again

high led
ENDIF
RETURN

' '**************************

' '**************************
set:
read countpulses*2, a
read countpulses*2+1, b

for idx = a to b
read idx,c
SEROUT2 txPin, baud,[13,(c dig 1),"S",(c dig 0)+48,((13 + (c dig 1) + "S" + 48+(c dig 0))^$FF)+1]
pause 100
SEROUT2 txPin, baud,[13,(c dig 1),"S",(c dig 0)+48,((13 + (c dig 1) + "S" + 48+(c dig 0))^$FF)+1]
pause 1000
next
RETURN

' '**************************

' '**************************
clr:
read countpulses*2, a
read countpulses*2+1, b

for idx = b to a step -1
read idx,c

if ((c dig 2)= 1) then
pause 5000
endif

SEROUT2 txPin, baud,[13,(c dig 1),"C",(c dig 0) + 48,((13 + (c dig 1) + "C" + 48 +(c dig 0))^$FF)+1]
pause 100
SEROUT2 txPin, baud,[13,(c dig 1),"C",(c dig 0) + 48,((13 + (c dig 1) + "C" + 48 +(c dig 0))^$FF)+1]
pause 1000
next
RETURN

'**************************

'**************************

logOff:
lcdout $FE, LcdLine2, " All systems GO "
failsafe = 0
turnOff = 0
logOffloop:
IF (exec = 0) THEN
PAUSE 10
loop1: IF (exec = 0) THEN loop1
IF turnOff THEN
RETURN
ELSE
lcdout $FE, LcdLine2, "OK, to turn OFF?"
PAUSE 200
failsafe = 0
turnOff = 1
ENDIF
ELSE
failSafe = failSafe + 1
IF failSafe > 10 THEN
turnOff = 0
lcdout $FE, LcdLine2, " All systems GO "
PAUSE 10
failsafe = 0
ENDIF

ENDIF
PAUSE 100
GOTO logOffLoop

' Interrupt handler
Disable ' No interrupts past this point
myint:
PIR1.5 = 0
lcdout $FE, LcdLine2, " Connected "
pause 1000

Resume ' Return to main program
Enable

end

**mister_e** · - 14th July 2007, 21:48

PIR1,5 is a read only register, so you can't aletr it. To clear the RCIF flag, you need to read RCREG untill it's empty.

Code:

' Interrupt handler
Disable ' No interrupts past this point
myint:
While RCREG 
    Dump=RCREG
    WEND

lcdout $FE, LcdLine2, " Connected "
pause 1000

Resume ' Return to main program
Enable

end

and then, as you don't use any HSERIN/HSEROUT, you need to change

Code:

DEFINE HSER_RCSTA 90h 'Hser receive status init
DEFINE HSER_TXSTA 20h 'Hser transmit status init
DEFINE HSER_BAUD 2400 'Hser baud rate

to

Code:

RCSTA = $90 ' Enable serial port & continuous receive
TXSTA = $20 ' Enable transmit, BRGH = 0
SPBRG = 25  ' 2400 Baud @ 4MHz, 0.17%

and...

Code:

INTCON.6 = 1' = $C0 ' Enable INTE interrupt

to

Code:

INTCON=%11000000

maybe i forgot few things... try it

**hakan** · - 15th July 2007, 08:25

Thanks for your respond Mister_e.
I have change the code, but no sucess.
Are I'm thinking wrong. Shoudn't I jump into the interrupt rutine when I send a few letters with "Serial Communicator" (MicroCodeStudio +) to the PIC.
Nothing hapends when I try.

**hakan** · - 15th July 2007, 18:57

I start over from the begining and now it's working.

Thanks for all help!

/Håkan

Code:

'   Pic Definition
    '   ==============
        ' Using PIC 16F874 @ 4MHZ and bootloader
        '
        DEFINE LOADER_USED 1
        DEFINE OSC 4        
        DEFINE LCD_DREG PORTB   ' Set LCD Data port        
        DEFINE LCD_DBIT 0       ' Set starting Data bit (0 or 4) if 4-bit bus        
        DEFINE LCD_RSREG PORTB  ' Set LCD Register Select port        
        DEFINE LCD_RSBIT 7      ' Set LCD Register Select bit         
        DEFINE LCD_RWREG PORTB  'LCD read/write port           
        DEFINE LCD_RWBIT 6      'LCD read/write bit          
        DEFINE LCD_EREG PORTB   ' Set LCD Enable port        
        DEFINE LCD_EBIT 5       ' Set LCD Enable bit        
        DEFINE LCD_BITS 4       ' Set LCD bus size (4 or 8 bits)        
        DEFINE LCD_LINES 2      ' Set number of lines on LCD        
        DEFINE LCD_COMMANDUS 2000' Set command delay time in us
        DEFINE LCD_DATAUS 50    ' Set data delay time in us
                
    '   Hardware configuration
    '   ======================
        '
        '
        TRISC  = %10000000    ' PORTC.7 is the RX input
                              ' PORTC.6 is the TX output
        On Interrupt Goto myint ' Define interrupt handler
        INTCON      =   %11000000            ' Enable INTE interrupt
        PIE1.5      =   1
        
        T2CON       =   %01111111
        PIE1.1      =   1
        
        ' LCD background
        LED             var     PORTD.3
        ' LCD
        LcdCls          CON     $01     ' clear the LCD
        LcdLine1        CON     $80     ' DDRAM address of line 1
        LcdLine2        CON     $C0     ' DDRAM address of line 2              
        ' Shaft Encoder
        clock           var     PORTD.0
        stat            var     PORTD.1
        ' ExecuteButton
        exec            var     PORTD.2
        
    '   Serial communication definition
    '   ===============================
        ' Using internal USART and MAX232 to interface to PC
        '
        'RCSTA = $90 
        DEFINE HSER_RCSTA 90h ' enable serial port, enable continuous receive
        'TXSTA = $20 
        define HSER_TXSTA 20h ' enable transmit, BRGH=1
        'SPBRG = 25                  
        define HSER_SPBRG 25 ' set baudrate to 2400   
        DEFINE HSER_CLOERR  1 ' automatic clear overrun error  
        
        T2400           CON     396
        Inverted        CON     $4000
        Baud            CON     T2400 '+ Inverted
        
        txPin           var     PORTC.6
        rxPin           Var     PORTC.7
    '   Alias definition
    '   ================
        '
        '
        RCIF VAR PIR1.5     ' Receive  interrupt flag (1=full , 0=empty)
        TXIF VAR PIR1.4     ' Transmit interrupt flag (1=empty, 0=full)
        OERR var RCSTA.1    ' Overrun error
        CREN var RCSTA.4    ' Continuous receive
        
        dump            var     byte 
        countPulses     VAR     Byte
        print           VAR     Bit
        a               VAR     Byte
        b               VAR     Byte
        c               var     byte
        idx             var     byte
        turnOff         VAR     Bit
        failSafe        VAR     Byte
        timer           var     word
              
    '   Hardware initialisation
    '   =======================
        '
        '
        pause 10 ' safe start-up delay
        countpulses = 1
        turnOff = 0
        print = 0
        high    led
        
Main:
        GOSUB   readpuls
        GOSUB   writeDisp
        GOSUB   readExec
        pause 10
    goto main
    
    '        '**************************

            '**************************
    writeDisp:
            IF (print) THEN
              SELECT case countPulses
    
              CASE 1
                 lcdout $FE,  LcdCls, "Start ALL Syst. "
              CASE 2
                 lcdout $FE,  LcdCls, "Main Sound Syst."
              CASE 3
                 lcdout $FE,  LcdCls, "Sub Sound Syst. "
              CASE 4
                 lcdout $FE,  LcdCls, "Main Disp System"
              CASE 5
                 lcdout $FE,  LcdCls, "Sub Disp System "
    
              CASE ELSE
                 lcdout $FE,  LcdCls, " Illigal value  "
              END SELECT
             
              Print = 0
            ENDIF
            RETURN
    
            '**************************
    
            '**************************
    readExec:
            IF (exec = 0) THEN
                  lcdout $FE,  LcdLine2, "  Starting Up   "
                    gosub set
                  GOSUB logOff
                  lcdout $FE,  LcdLine2, "  Shuting Down  "
                    gosub clr
                  lcdout $FE,  LcdLine2, "                "
        
            ENDIF
    
            RETURN
    
    '        '**************************
    
    '        '**************************
    readPuls:
            IF(clock = 0) THEN
              IF (stat) THEN
                countpulses = ((countpulses - 1)//5)+1'(countpulses - 1) MIN 1'((countpulses - 1)//5)
              ELSE
                countpulses = ((countpulses + 1)//5)+1'(countpulses + 1) MAX 5'((countpulses + 1)//5)
              ENDIF
              print = 1
              high led
              PIE1.0 = 1
              again:  IF clock = 0 THEN GOTO again
              
              high led
            ENDIF
            RETURN
        
    '        '**************************
    
    '        '**************************
    set:
                read countpulses*2, a
                read countpulses*2+1, b
                
                for idx = a to b
                  read idx,c
                  'SEROUT2 txPin, baud,[13,(c dig 1),"S",(c dig 0)+48,((13 + (c dig 1) + "S" + 48+(c dig 0))^$FF)+1]
                  hserout [13,(c dig 1),"S",(c dig 0)+48,((13 + (c dig 1) + "S" + 48+(c dig 0))^$FF)+1]
                  pause 100 
                  'SEROUT2 txPin, baud,[13,(c dig 1),"S",(c dig 0)+48,((13 + (c dig 1) + "S" + 48+(c dig 0))^$FF)+1]
                  hserout [13,(c dig 1),"S",(c dig 0)+48,((13 + (c dig 1) + "S" + 48+(c dig 0))^$FF)+1]
                  pause 1000
                next
             RETURN
             
    '        '**************************
    
    '        '**************************
    clr:
                read countpulses*2, a
                read countpulses*2+1, b
                
                for idx = b to a step -1
                  read idx,c
                  
                  if ((c dig 2)= 1) then
                    pause 5000
                  endif
                    
                  'SEROUT2 txPin, baud,[13,(c dig 1),"C",(c dig 0) + 48,((13 + (c dig 1) + "C" + 48 +(c dig 0))^$FF)+1]
                  hserout [13,(c dig 1),"C",(c dig 0) + 48,((13 + (c dig 1) + "C" + 48 +(c dig 0))^$FF)+1] 
                  pause 100
                  hserout [13,(c dig 1),"C",(c dig 0) + 48,((13 + (c dig 1) + "C" + 48 +(c dig 0))^$FF)+1]
                  'SEROUT2 txPin, baud,[13,(c dig 1),"C",(c dig 0) + 48,((13 + (c dig 1) + "C" + 48 +(c dig 0))^$FF)+1] 
                  pause 1000
                next
             RETURN
            
            '**************************
    
            '**************************
    
    logOff:
            lcdout $FE,  LcdLine2, " All systems GO "
            failsafe = 0
            turnOff = 0
    logOffloop:
            IF (exec = 0) THEN
               PAUSE 10
       loop1:  IF (exec = 0) THEN loop1
               IF turnOff THEN
                 RETURN
               ELSE
                 lcdout $FE,  LcdLine2, "OK, to turn OFF?"
                 PAUSE 200
                 failsafe = 0
                 turnOff = 1
               ENDIF
            ELSE
               failSafe = failSafe + 1
               IF failSafe > 10 THEN
                 turnOff = 0
                 lcdout $FE,  LcdLine2, " All systems GO "
                 PAUSE 10
                 failsafe = 0
               ENDIF
    
            ENDIF
            PAUSE 100
            GOTO logOffLoop
        
    
    ' Interrupt handler
        Disable                 ' No interrupts past this point
myint:  if RCIF = 1 then
            hserin[WAIT($01),a]
            b = 0
            while a = $02
                hserin[a]
                write b, a
                b = b + 1
            wend
            
            While RCif         ' Code until I write the right rutine
                Dump=RCREG
            WEND
            
            lcdout $FE, LcdLine2, " Connected "
        else
            timer = timer+1
            if timer > $FFFE then
                low led
                PIE1.1 = 0
            endif
            
        endif
        Resume                  ' Return to main program
        Enable

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