Help with pic16f690 -max232cpe

[krise86]

So i started to try out some serial com and after alot of struggling i have gotten it almoste to work.

i have pickit2 with pic16f690 and a demoboard with max232.

max232:

pin 1 & 3 - 1uf
pin 4 & 5 - 1uf

pin 2 - 1uf to vdd
pin 15 - 1uf to gnd
and gnd to vdd 1uf

so i have been able to recive text on my computer from the pic but it's somehow malformed.

i try to send "Hello World", 13, 10
and i get
Hello0World<(8A)>

when i stop the pic i recive the space and cr and lf

when i make the pic hserout the hserin i returns random alphas or signs.

my current code is as follows:

Code:

DEFINE OSC 4

'intcon=0 ' Interrupts disabled
cm1con0=0 ' Comparator 1 disabled
cm2con0=0 ' Comparator 2 disabled
'cm2con1=0 ' Comparator 2 disabled

ANSEL=0 ' Pins to be Digital
ANSELH=0 ' Pins to be Digital

Include "modedefs.bas"

DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h 'sets bergh = 1 or 20h sets = 0
DEFINE HSER_BAUDCON 0h ' 0h
DEFINE HSER_BAUD 9600 '16468
DEFINE HSER_SPBRG 25
'DEFINE HSER_CLROERR 1


main:
hserout ["Hello World", 13, 10]
pause 1000
goto main

and i cant figure out why!

im using picbasic with MC studio and MPASM

Please HELP

[aratti]

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
DEFINE HSER_SPBRG 25  ' 9600 Baud @ 4MHz, 0,16%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically

Tray to replace your USART setting with the one given above.

Al.

[krise86]

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 24h ' Enable transmit, BRGH = 1
DEFINE HSER_SPBRG 25  ' 9600 Baud @ 4MHz, 0,16%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically

Tray to replace your USART setting with the one given above.

Al.

Thx for replying, but i have tried that to. and still no go. when i change the usart settings to use 2400 bauds it wont work at all, then i just get alphas and numbers.

can there be something wrong with my connections. iv tried with 2 max232 and same result. have i connected something wrong would this result in such an error.

and one thing more, when i send a alpha, let's say "t" if i repeat that like 10 timer with 50ms pause i revice the correct letter back maybe once <- if i look a hserin and hserout

[aratti]

What kind of terminal are you using?

Can you post your wiring ?

Al.

[krise86]

What kind of terminal are you using?

Can you post your wiring ?

Al.

Well it looks like i found the probleme, i looked over the max232 data sheet and i frogot to connect vcc and gnd

Now i recive the expected output but it wont read the input.

DEFINE OSC 4

'intcon=0 ' Interrupts disabled
cm1con0=0 ' Comparator 1 disabled
cm2con0=0 ' Comparator 2 disabled
'cm2con1=0 ' Comparator 2 disabled

ANSEL=0 ' Pins to be Digital
ANSELH=0 ' Pins to be Digital

Include "modedefs.bas"

DEFINE HSER_RCSTA	90h
DEFINE HSER_TXSTA	24h 'sets bergh = 1 or 20h sets = 0
'define HSER_BAUDCON 0h ' 0h
'DEFINE HSER_BAUD	9600 '16468
DEFINE HSER_SPBRG	25
DEFINE HSER_CLROERR 1

rxVal Var Byte
HSEROUT ["Waitin signal"]
main:
    hserin [rxVal]
    hserout [rxVal]
    'HSEROUT ["Test should work"]
    pause 20
goto main

Any ideas?

And Thx for the help so far, sorry for not checking the schematics better
and im using 232analyzer terminal software

[aratti]

Can you post the schematic?

Al.