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evoltech
Joined: 24 Sep 2007
Posts: 2
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| Advice on a simple program |
 Posted: Mon Dec 10, 2007 4:30 pm |
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Hello all I am having trouble getting the simplest of programs to actually do something once it gets on the chip.
I am testing out a PIC16F628A and I can't seem to get any of the pins to "pulse", though everything seems to work fine in MPLAB SIM30 version 3.60.00.00. I am developing with MPLAB IDE 7.60.00.00, compiling with the CCS C compiler 4.0.38, and programming with Quasar electronics PIBmicro programmer version 201106. I have verified that I get a clock pulse on the board but do not see any of the pins on port b pulsing, can you provide any advise?
| Code: |
#include <16F628A.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use fixed_io(b_outputs=PIN_B0,PIN_B1,PIN_B2,PIN_B3,PIN_B4,PIN_B5,PIN_B6,PIN_B7)
void main()
{
int8 toggle = 0xFF;
set_tris_b(0x00);
while (1) {
toggle = ~toggle;
output_b(toggle);
}//while
} |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon Dec 10, 2007 5:34 pm |
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You don't need to set fixed i/o mode or TRIS. Just let the compiler
handle it. If you use the CCS i/o functions, the compiler will put in
code to properly handle the TRIS. You don't even have to think about it.
Here's a simple test program that toggles Pin B0. I specified the NOMCLR
fuse, because it's possible that you forgot to put a pull-up resistor on
the MCLR pin. With the NOMCLR fuse, this won't matter. The PIC will
still run the program even without the MCLR pull-up.
If it doesn't work, I would suspect your programmer, or maybe you
don't have a crystal and its capacitors properly connected to the PIC.
| Code: |
#include <16F628A.h>
#fuses HS, NOWDT, PUT, NOLVP, NOMCLR
#use delay(clock=20000000)
//==========================
void main()
{
while(1)
{
output_high(PIN_B0);
delay_ms(500);
output_low(PIN_B0);
delay_ms(500);
}
} |
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rnielsen
Joined: 23 Sep 2003
Posts: 852
Location: Utah
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| Posted: Tue Dec 11, 2007 10:20 am |
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In case your crystal might not be functioning properly, you could try using the internal oscillator to see if it works.
| Code: | #include <16F628A.h>
#FUSES NOWDT
#FUSES PUT
#FUSES NOMCLR
#FUSES NOLVP
#FUSES INTRC_IO
#use delay(clock=4000000)
void main()
{
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
setup_oscillator(OSC_4MHZ);
while(1)
{
output_b(0x00);
delay_ms(500);
output_b(0xFF);
delay_ms(500);
}
}
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Ronald |
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