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xcamarox
Joined: 18 Oct 2006
Posts: 9
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| Output_float, input statements help... |
 Posted: Wed Oct 18, 2006 10:25 pm |
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Guys or gals,
I need help with this little project.
I have the PIC16F877A chip and Im trying to read the values from some pins and low or high some other pins based from the input values.
I already checked that the values in the inputs were high (4.5 - 5V) at first (first if condition) and tried low (0V) (second if condition), and the outputs from the chip never change (always stay at 2.1 - 2.2V), in both situations.
What Am I doing wrong? Im a newbie in PIC C and I would like to get some guidance. Below is the code Im using...
#include "C:XXXX\AC.h"
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
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);
while (TRUE)
{
//output_float (PIN_D3);
//output_float (PIN_D7);
//output_float (PIN_D6);
if (input (PIN_D3) == 1 && input (PIN_D7) == 1 && input (PIN_D6) ==1)
{
output_high (PIN_D1);
output_high (PIN_D0);
output_high (PIN_A1);
}// end if statement
else if (input(PIN_D3) == 0 && input (PIN_D7) == 0 && input (PIN_D6) == 0)
{
output_low (PIN_D1);
output_low (PIN_D0);
output_low (PIN_A1);
}//end else
else
{
output_low (PIN_D1);
output_low (PIN_D0);
output_high (PIN_A1);
} //end second else
}// end while loop
}// end program |
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xcamarox
Joined: 18 Oct 2006
Posts: 9
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| Posted: Wed Oct 18, 2006 10:28 pm |
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The .h file is as follows:
#include <16F877A.h>
#device adc=8
#use delay(clock=20000000)
#fuses NOWDT,RC, NOPUT, NOPROTECT, NODEBUG, BROWNOUT, LVP, NOCPD, NOWRT
Is there anything wrong with this code? Obviously there is, because it does not work. Do I have to use the timer? CCCP? Anything?
Im really hoping for an answer.
Please reply at your earliest convinience.
TIA! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Oct 18, 2006 11:09 pm |
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| Quote: |
#include <16F877A.h>
#device adc=8
#use delay(clock=20000000)
#fuses NOWDT,RC, NOPUT, NOPROTECT, NODEBUG, BROWNOUT, LVP, NOCPD, NOWRT |
1. Are you really using an external RC oscillator circuit ?
The highest allowable frequency is 4.0 MHz. It won't run at 20 MHz.
To get a 4 MHz frequency, you have to use R-C values of about
3K for the resistor and 20 pF for the capacitor.
If you don't know what you really have (R-C circuit, crystal, or
external oscillator) see this thread. It has links to photos.
http://www.ccsinfo.com/forum/viewtopic.php?t=28558
2. Are you really using Low Voltage Programming mode ? To use
that mode, you need to have a home-made programmer such as
the "TLVP" programmer, that supports LVP mode.
If you're using a normal programmer, such as a Microchip ICD2,
CCS-ICD, CCS MachX, Warp-13a, PicStart-Plus, etc., then change
the fuse to NOLVP. |
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xcamarox
Joined: 18 Oct 2006
Posts: 9
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| Posted: Wed Oct 18, 2006 11:26 pm |
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PCM Programmer, I could kiss you right now, but I guess I would hate it later so,
THANK YOU VERY MUCH!!!
That did it. No wonder I used to have mixed results when I used this chip back 2 motnhs ago. Some stupid settings made a huge difference. I guess next time I'll do some more research. I would not think that for such a small program this made a difference, but now I guess I'll be more careful next time.
THANK YOU. GRACIAS. DANKA. MERCI!!!
I really can not thank you enough. |
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