Help with pic16f690 -max232cpe

[krise86]

Can you provide details of the computer you are hooking this up to. Some laptops don't have enough "umph" to provide the voltages required when using PIC programmers, so it might be the same with the project your are working on.

it's an self built desktop. with asus p6d motherboard and it should do the trick. but i have an pci serial with power options for setting up to 4 pins to 5 or 12 v.

but i see that the voltage from the pickit is 4.8 maybe i should connect an ext pw sup?

it's irritating because this should be such a small case and iv been stuck at this since like friday.

And to all Thx for all the help so far!

[krise86]

Now i have tried external pw and still no go. the pics sends fine, but wont recive. I have no other ideas left.

other than if the voltage on pin 2 and 6 on the max is +6 and -2 but should be +10 nad -10. what am i doing wrong?

[ScaleRobotics]

Can you post your entire code with the trisb and all ... plus whatever code you are using to determine it is not receiving.

Thanks,

Walter

[krise86]

DEFINE OSC 4

ANSEL = %00000000 ' Pins to be Digital
ANSELH = %00000000 ' Pins to be Digital
TrisA = %00000000
PortA = 0
TrisB = %00100000 ' if the only input is pin 10 Rx
PortB = 0
TrisC = %00000000 ' if none of the portC pins are used
PortC = 1

CM1CON0 =0
CM2CON0 =0
CM2CON1 =0

adcon1=0

Include "modedefs.bas"

DEFINE HSER_RCSTA	90h
DEFINE HSER_TXSTA	24h 'sets bergh = 1 or 20h sets = 0
'define HSER_BAUDCON 1h ' 0h
DEFINE HSER_BAUD	2400 '16468
DEFINE HSER_SPBRG	103
DEFINE HSER_CLROERR 1
rxVal Var word

start:
Hserout ["Hello World", 13, 10] ' Send text followed by carriage return and linef
main:
Hserin 10000,start,[rxVal] ' Get a char from serial port
Hserout ["Got value:", rxVal] ' Send char out serial port
pause 30
goto main

That's the code.

[mackrackit]

DEFINE HSER_RCSTA 90h ' Enable serial port & continuous receive
DEFINE HSER_TXSTA 20h ' Enable transmit, BRGH = 0
DEFINE HSER_SPBRG 25 ' 2400 Baud @ 0.17%
DEFINE HSER_CLROERR 1 ' Clear overflow automatically

The above should be for 4MHz.
Can you also post your configs and what are you using for an OSC?

[krise86]

I have already tried that, so it's still a no go.

But no one has commented on the voltage levels of the max. it should say 10 but i dont get it higher than 7. when i rebuild the whole shematics on the breadboard the voltage got i little better but still no higher than 7

[aratti]

But no one has commented on the voltage levels of the max. it should say 10 but i dont get it higher than 7. when i rebuild the whole shematics on the breadboard the voltage got i little better but still no higher than 7

Check the capacitors used. See snap attached for value.

Al.