serin Bug on PIC16f688?

[chriroz]

I still have a problem receiving data with my my pic16f688. I can send data (serout or serout2) but i can't receive it (serin or serin2) . does anyone else have this problem OR know how to solve it? (sorry for reposting it but i just need this to be solved, i've been patient enough but time is running out)

[Dick Ivers]

Yes, I use serin on the 16f688, and it seems to work. What pin is your serin input? Do you have a pullup resistor on that pin or have you activated the pic's internal pullup? What goes wrong when you try serin?

[chriroz]

i use PORTC.0 (pin10) or PORTC.1 (pin 9) (I tried both).I don't use pullups (YET ). What does that pullup resistor do and how do i activate internal pullup?

[chriroz]

I connected my data wire with a 10k resistor to the ground (thats pulling down right?) and tried to use any combination of boudrates but i never see my pic blinking (so no data transmission yet...)
@stamp:

 
DO
FOR dat = 16000 TO 20000 STEP 1
DEBUG DEC5 dat,CR
SEROUT 10,dat, ["kk"]
NEXT

@pic

serIn2 S_in ,16780,[wait("k"),dat]
gosub blink

my pic and stamp both use the same power source so that can't be the problem either. and my stamp CAN transmit to my stamp so timing must be right...

can anyone provide me a working code to make two pic16f688 communicate trough portc.1 so i can test my pics with that code.

here is my full code again:
stamp:

' {$STAMP BS2}
' {$PBASIC 2.5}
' {$PORT COM1}

dat VAR Word

DO
FOR dat = 16000 TO 20000 STEP 1
DEBUG DEC5 dat,CR
SEROUT 10,dat, ["kk"]
NEXT

LOOP

pic:

define OSC 20


S_in    var PORTC.1
S_Out   var PORTC.1
Led     var PORTC.3
dat     var byte

init:
    gosub Startblink
    high led
    low led
    pause 500
    gosub blink
    
Main:
       
	SerIn2 S_in ,16780,[wait("k"),dat]
	gosub blink
    pause 50
goto main


Blink:
    high led
    pause 10
    low led
return

Startblink:
    for dat = 1 to 16
    high led
    pause 10 * (16-dat)
    low  led
    pause 10 * (16-dat)
    next 
return

please help me...

[chriroz]

I'm getting a little pissed now! Why is nobody helping me? i asked a question (what are pullups and how do i enable internal pullups) that most of the people here can answer BUT NOBODY DOES. AND WHY IS ONE OF THE MOST BASIC FUNCTIONS (SERIN) NOT WORKING????? i know it must be a simple answer BUT I CAN'T figure it out alone... (i never had any lessons in electronics or uC programming becouse i'm still at highschool)

does it have anything to do with ANSEL or TRISC?
can anyone post or send me a WORKING code for a 16f688 that uses SERIN(2)

[BigWumpus]

OK, you are pissed ?????

1.
Use your brain !

2.
The sender works to fast! He sends maybe the lowbyte of the word "dat" followed by "kk".
The receiver waits for one "k" and receives another byte. wrong order ?
Then the LED is 10ms on.

3.
Using software-UART paused by blinking and waiting needs a very slow sender with pauses between the characters.

4.
Use Hardware-UART inside a Interrupt-routine.