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Ringo42
Joined: 07 May 2004
Posts: 263
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| inputs not working |
 Posted: Wed May 20, 2009 7:20 pm |
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I'm using a pic18f2221 and CCS pch 4.086.
In my program I'm reading some pins, but they always read low, even when pulled to 5V.
Here is the code
| Code: |
if(Dio_states[0]==2)//input
values[10]=input(PIN_B5);
if(Dio_states[1]==2)//input
values[11]=input(PIN_B4);
if(Dio_states[2]==2)//input
values[12]=input(PIN_B3);
if(Dio_states[3]==2)//input
values[13]=input(PIN_B2);
if(Dio_states[4]==2)//input
values[14]=input(PIN_B1);
if(Dio_states[5]==2)//input
values[15]=input(PIN_B0);
if(Dio_states[6]==2)//input
values[16]=input(PIN_C7);
if(Dio_states[7]==2)//input
values[17]=input(PIN_C6);
if(Dio_states[8]==2)//input
values[18]=input(PIN_C5);
if(Dio_states[9]==2)//input
values[19]=input(PIN_C2);
printf("\r\nStates");
for(i=0;i<10;i++)
{
printf("%d ",Dio_states[i]);
}
printf(" values ");
for(i=10;i<20;i++)
{
printf("%d ",values[i]);
}
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The states always start off as '2' and they are not getting changed. Looking at the printF output I get
Digital values 0 0 0 0 0 0 0 0 0 0 States2 2 2 2 2 2 2 2 2 2
this is with pin B4 pulled High. I checked it with a voltmeter and it is really 5V. The weird part is that pin B5,C7,C6, C5 and C2 work, but the others don't. The others always return a 0.
I wrote a simple program that does nothing but read the pins and it works
| Code: |
void main ()
{
while (1)
{
printf("%d %d %d %d %d %d %d %d %d %d\r\n",input(PIN_B5),input(PIN_B4),input(PIN_B3),input(PIN_b2),input(PIN_b1),input(PIN_B0),input(PIN_C7),input(PIN_C6),input(PIN_C5),input(PIN_C3));
delay_ms(100);
}
}
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I do not have fastIO enabled.
Any idea what could be causing this?
Thanks
Ringo
_________________
Ringo Davis |
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Ringo42
Joined: 07 May 2004
Posts: 263
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| Posted: Wed May 20, 2009 8:17 pm |
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I found the line that kills the inputs, but it still makes no sense.
This code does the same thing
| Code: |
#include <18F2221.h>
#device adc=10
#fuses HS,noWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#include <stdlib.h>
#use rs232(baud=19200, xmit=PIN_C0, rcv=PIN_C1)
void main ()
{
setup_adc_ports(All_ANALOG);
setup_adc( ADC_CLOCK_INTERNAL );
while (1)
{
printf("%d %d %d %d %d %d %d %d %d %d\r\n",input(PIN_B5),input(PIN_B4),input(PIN_B3),input(PIN_b2),input(PIN_b1),input(PIN_B0),input(PIN_C7),input(PIN_C6),input(PIN_C5),input(PIN_C3));
delay_ms(100);
}
}
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If I take out the 2 ADC lines then it works great. I can't eliminate them though becasue I'm using ADC as well. I updated to the latest compiler 4.093 as well, still no luck.
Any ideas?
Ringo
_________________
Ringo Davis |
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dyeatman
Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK
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| Posted: Wed May 20, 2009 8:56 pm |
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Look at the data sheet and see on which pins ALL the Analog ports you
enabled are located and that will explain why enabling ALL_ANALOG has
the effect you are seeing.
Enabling the ADC overrides the other functions on those pins. To
enable just some of the ADCs look in the 18F2221.h header file for the
ADC control definitions. |
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Ringo42
Joined: 07 May 2004
Posts: 263
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| Posted: Wed May 20, 2009 9:02 pm |
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Thanks, I just found this. This is the first pic I used that has ADC pins on something other than port A and E.
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Ringo Davis |
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