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byatin
Joined: 26 Oct 2006
Posts: 10
Location: delhi -india
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| adc with porta & port b as digital on pic18f4550 |
 Posted: Mon Oct 30, 2006 1:04 am |
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| hi, i am using pic18f4550 microcontroller , i have to use port a pins ra0,ra1 as a analog and all port b pins as digital ,can anybody help me how to do it. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Oct 31, 2006 1:26 am |
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| Quote: | I am using pic18f4550 microcontroller , I have to use port
pins ra0, ra1 as analog and all port b pins as digital. |
Look at the 18F4550.H file. The file is in this directory:
c:\Program Files\Picc\Devices
Scroll down near the end of the file. You'll see a section with this title:
| Code: |
// Constants used in SETUP_ADC_PORTS() are:
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These are the settings that are used to configure pins as digital or Analog.
You said you're looking for a setting that will make pins A0 and A1 into
analog pins. Look in the list in the .H file. There is a setting for that.
Use that setting as a parameter in the setup_adc_ports() function.
If you want the Analog pins on Port B to be configured as digital pins
upon power-on reset, there is a fuse setting to do this. Add the setting
shown in bold below.
| Quote: |
#include <18F4550.h>
#fuses XT,NOWDT,NOPROTECT,BROWNOUT,PUT, NOLVP,NOPBADEN
#use delay(clock=4000000) |
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