Pic 16f690 pins shorted

[jj9867]

I'm having trouble with pins C3 and C4 on my pic. I first noticed it trying to output a byte to port C, and then individually output_high on pins to narrow it down.

output_high(pin_c3); turns on pin c3 and c4 both
output_high(pin_c4); doesn't do anything

I have tried it in a breadboard and on the chip debugger board. I have tried it with several chips, and it always does the same thing.

Anyone else had this happen?

[PCM programmer]

You should always post your compiler version.

This thread may help:
http://www.ccsinfo.com/forum/viewtopic.php?t=29942&highlight=16f690+setupcomparator

[jj9867]

Its 4.013.

That thread isn't very helpful, unfortunately. All other pins on port C work, except 3 and 4. In the other thread, they're doing stuff on pins 0 and 1.

[PCM programmer]

Did you try disabling the comparators ?

[jj9867]

ok I tried disabling them using

setup_comparator(NC_NC_NC_NC);

still no luck.

I am using simple code just

set_tris_c(0);
output_c(0b00010111);

this just turn on bits 0,1, and 2. Bit 4 stays off.

If I go:
output_c(0b00001111);

then bits 0-4 all turn on.

It seems as though bit 4 is linked with the output of bit 3.

Any help would be great,
JJ

[PCM programmer]

Post a complete test program, using that code, but show all the #include,
#fuses, and #use statements. Show variable declarations, if any.
Show the main(), the braces, etc. It should be a compilable program.
Run the test program in a PIC to prove that it shows the problem,
before you post the code.

If you can do that, I can compile the program for both 4.013 and 4.069,
and compare the .LST files.

[jj9867]

no problem I probably should have posted the code in the first place...

here is the header file:

#include <16F690.h>
#device adc=8

#FUSES NOWDT //No Watch Dog Timer
#FUSES RC //Resistor/Capacitor Osc with CLKOUT
#FUSES NOPROTECT //Code not protected from reading
#FUSES BROWNOUT //Reset when brownout detected
#FUSES MCLR //Master Clear pin enabled
#FUSES NOCPD //No EE protection
#FUSES NOPUT //No Power Up Timer
#FUSES IESO //Internal External Switch Over mode enabled
#FUSES FCMEN //Fail-safe clock monitor enabled

#use delay(clock=20000000)

..................................................

and here is the C file

#include "G:\projects\lights\lighta.h"


void main()
{
setup_comparator(NC_NC_NC_NC);
setup_ccp1(CCP_OFF);


setup_adc(ADC_OFF);


while (1 == 1)
{

set_tris_c(0);
output_c(0b00010111);
}
}


......................................
It is pretty much as simple as I can make it

Thanks for the help

[PCM programmer]

[jj9867]

it seems to work with the other lights.

Yes you are right. I left the default that was generated by the wizard. I have played with a few of the settings but it does not seem to help. What should the fuses be set for to simply run with the internal oscillator of the pic?
In other words, if I simply turn on the power to the pic what should the fuses be set at and what should the delay be?

Thanks

[PCM programmer]

It turns out that I don't have vs. 4.013. But I have 4.014, and I tested
the following program with that version. It works OK. Pin C3 toggles
high and low, and pin C4 stays at a low level.

You don't have to set the TRIS with the set_tris_c() statement.
The compiler will automatically set it for you, when it does the output_c()
statement.

The program below uses the internal RC oscillator, and it runs at 8 MHz.
Notice the fuse is set for INTRC_IO. The highest speed available is
8 MHz. I've set it for that frequency.

[brianm]

My setup;

MPLAB
CCS PCM COMPILER (4.062)

PROGRAMMING DEVICE = PICKIT 2
and low count demo board

--------------------------------------------------

I picked the code above to try out the setup.

I 'made' the project with one small warning

I was expecting the led on the low count demo board to turn on and off

but I see nothing.

I used mplab, programmer PICKIT2...erase and write.

I am new to the CCS world but I have worked with assembler for a while (2 months).

Thanks all.
-----------------------------------------
New information


Now I closed MPLAB and opened PICKIT2 software and loaded the hex file created and wrote it to the low count demo board and it worked fine.

What am I doing wrong in the MPLAB environment?



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