Serin Problem with 12F629/PBP

Hello all,

I am having a devil of a time getting my SERIN to work with a 12F629. I connected the RS232 pin2 with a 1k resistor connected to pin7 of the 629, RS232 pin 3 with a 22.1k resistor to pin 6 of the 629, and RS232 pin 5 to pin8 of the 629. I am using a modified serqual PBP example program that writes Tom and Jerry to hyperterm. The output portion works fine... The input I keep banging my head on. I cannot get past the input.. I modified the original to turn off analog stuff gleaned from the archives. Also used a constant to load the pin number and directly set the port number. Any help would be appreciated..

George


' SERIN Command w/ Qualifiers
'
' "Crude" serial filter for C Style Comments

INCLUDE "modedefs.bas"
TRISIO.0 = 0
TRISIO.1 = 1
CMCON = 7
OPTION_REG.7 = 0
VRCON = 0

SO CON 0
SI CON 1
B0 VAR BYTE

SerOut 0,N2400,["TOM and JERRY",$D,$A]

wait1: SerIn SI,N2400,["//"],B0
SerOut 0,N2400,["Serial In RCVD",$D,$A]

loop: SerOut SO,N2400,[B0]
IF B0 = 13 Then wait1
SerIn SI,N2400,B0
GoTo loop

I think I have never used serin successfully, therefore let me ask <b>you</b> an <u><font color = red><b>unqualified question:</u></b></font color> How many letters can you store in a single byte variable, like B0 ? And as I am leaving the house right now and do not have my manual handy, I may be all wet as to this line of questioning.

Joe,

Thanks for replying to my post. Of course, the single byte variable can only store one ascii charactor (char in C). One charactor is just enough to reply to a Yes/No ( Y )/( N ) query presented with SEROUT. Please understand that I am just trying to get this to work and will build on that... As of now, I cannot get past inputting a single char SERIN. I dont know if it is my hw implementation ( using MEL suggested resistors ), am missing something unique to 12F629 programming, or my serial port setup on the PC.

Further information about my configuration:
- Using a 4Mhz external resonator
- Selected XT on meProg..
- SEROUT working beautifully...
- Hyperterm set to 8N1 and receives ASCII from 629

Hello All,

I got SERIN to work.. I summized that my code was no different than half a dozen other 629/675 SERIN code snippets in the archives.. So I thought that maybe I was barking up the wrong tree ( code problem ). Maybe my problem was the input interface. I was using the MEL suggested 22k resistor ( 22.1k ) on the PIC input with no luck. I Googled "PIC RS232 Interface" and found multiple links that use only a 10k input resistor. I changed my input resistor to 10k and bang it worked...

Thanks everyone for the support. As I learn more, I hope to be an active member on this board.

George

I know little english.
I also have problems 12f675 serout2.
problem was solved by adding "define OSCCAL_1k 1".
Will benefit from this example that would send.
My my script below

@ device pic12f675, intrc_osc, wdt_on, bod_on, cpd_off, pwrt_on, mclr_off, protect_off

DEFINE OSCCAL_1k 1
DEFINE ADC_BITS 8 ' Set number of bits in result
DEFINE ADC_CLOCK 3 ' Set clock source (rc = 3)
DEFINE ADC_SAMPLEUS 10 ' Set sampling time in

CMCON = 7 ' Comparators OFF
ANSEL = %00100001 ' AN0 enabled (last 4 bits are enable bits {AN3:AN0}
ADCON0 = %11000001 ' VCC Vref / Turn On ADC Module
trisio = %001011 ' 1 giriş 0 Çıkış

SYMBOL AN_OKU = GPIO.0
SYMBOL TX = GPIO.5
VOLT VAR WORD

BASLA:
ADCIN AN_OKU, VOLT
pause 10
VOLT.highbyte = ADRESH
VOLT.lowbyte = ADRESL
SEROUT2 tx,16780 ,["volt : ", dec5 volt, ?10,?13 ]
pause 1000
GoTo basla

Thanks Timurak,

I didnt initially post it, but my platform uses the external 4 MHz. oscillator, but thank you for answering my post. I did fix the input problem with a change in the resistor from 22k to 10k. Now Serin is working flawlessly.

george