12f675 to 16f877

Hello! I´m trying to send data from PIC12F675 to 16F877 via serout2.
The 12F675 is generating the sequence:
0,1,2,3,4,...,255

And the 16F877 is receiving:
128,129,130,131, ... , 157,158,159,128, 129,130,... Why?

12F675 code:

@ __config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_OFF
DEFINE OSC 4
OPTION_REG.7 = 1 ' Disable pullups
TRISIO = 101001
CMCON = 7 ' Comparators OFF
ANSEL = 0 ' A/D OFF -- Port pins all digital
AL var byte

TEMP var gpio.0 ' 1
RELE1 var gpio.1 ' 0
RELE2 var gpio.2 ' 0
RES var gpio.3 ' 1
TX var gpio.4 ' 0
RX var gpio.5 ' 1
al =0
low RELE1
low RELE2
main:
low tx
serout2 TX,813,[AL]
AL=AL+1
pause 500
goto main

16F877 code:

DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTD
DEFINE LCD_RSBIT 2
DEFINE LCD_EREG PORTD
DEFINE LCD_EBIT 3
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
Define OSC 4
ADCON1 = 7
led var PORTC.0
trim var PORTA.1
rx var PORTB.5
B0 var byte

Main:
serIN2 RX,813,[B0]
LCDOUT $fe, 1,"b0 ", dec B0
LCDOUT $fe,$c0, bin (B0)
pause 100
GoTo Main
End


Bit 7 is always set to 1, Why?

Any suggestion, please!

Remove PAUSE 100 on the receiver side.

Cheers

Al.

I removed the Pause 100, but no change.

Did you set PORTB.5 as an input? (TRISB.5 = 1 in your 16f877)

Your LCD DEFINES seems not corrected. Check them with the example given in page 95 of PBP manual.

Al.

On the 12F675, add this line ...

Code:

---

DEFINE OSCCAL_1K 1

---

And, remove the LOW TX before the SEROUT2 statement.

Thank you for your comment. Its better, but still not work properly. This is my new code....
------------------------------
'12F675 - TX


@ __config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_OFF
DEFINE OSC 4
OPTION_REG.7 = 1
TRISIO = %00101001
CMCON = 7
ANSEL = 0
AL var byte
TX var gpio.4
AL =0


main:
FOR ALl=0 to 200
SERUOT2 TX,84,[AL]
PAUSE 100
NEXT AL
GOTO main
---------------------------------
'16F877 - RX


DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTD
DEFINE LCD_RSBIT 2
DEFINE LCD_EREG PORTD
DEFINE LCD_EBIT 3
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
Define OSC 4
TRISB= %11111111
ADCON1 = 7
OPTION_REG.7 = 1
RX var PORTB.5
B0 var byte


Main:
SERIN2 RX,84,[B0]
LCDOUT $fe, 1,"DEC= ", dec B0
LCDOUT $fe,$c0,"BIN= ", bin (b0)
GOTO Main

End
--------------------------------------
Now, on display i have...
1,2,3,4,133,6,7,8..... or
1,2,3,132,133,6,7...or
129,2,3,132,5,6...etc.
With "DEFINE OSCCAL_1K 1" in TX i have...
193,192,193,194,195,194,195,196....
I am beginner, but this is simple code! I don't understand!
Sorry for my bad English.

Check the spelling in the code

Quote:

---

SERUOT2 TX,84,[AL]

---

Then..

Add a dummy character to the TX

Code:

---

Synch    CON "~"
SEROUT2 TX,84,[Synch,AL]

---

For the RX

Code:

---

Synch    CON "~"
SERIN2 RX,84,[WAIT(Synch),B0]

---

Problem solved! Thank You All...
Now code works fine:

'--------- TX
@ __config _INTRC_OSC_NOCLKOUT & _WDT_OFF & _MCLRE_OFF & _CP_OFF

DEFINE OSC 4
OPTION_REG.7 = 1
TRISIO = 101001
CMCON = 7
ANSEL = 0
AL var byte
TX var gpio.4
al =0

main:
for al=0 to 200
SEROUT2 TX,813,["t","m","p",AL]
pause 100
next al
goto main

End

'--------- RX
DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 4
DEFINE LCD_RSREG PORTD
DEFINE LCD_RSBIT 2
DEFINE LCD_EREG PORTD
DEFINE LCD_EBIT 3
DEFINE LCD_BITS 4
DEFINE LCD_LINES 2
Define OSC 4
TRISB= 111111
ADCON1 = 7
OPTION_REG.7 = 1
RX var PORTB.5
B0 var byte

Main:
low rx
serIN2 RX,813,[WAIT("tmp"),B0]
Lcdout $fe, 1,"DEC= ", dec B0
LCDOUT $fe,$c0,"BIN= ", bin (b0)
GoTo Main

End

Best regards