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pom
Joined: 25 Nov 2004
Posts: 30
Location: Germany
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| AD-Converter with external reference |
 Posted: Thu Nov 25, 2004 3:46 am |
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Hello everybody,
I have a huge problem with using an external reference for AD-converter.
I try to programm a 18F258 to detect a voltage on the PINs A0 and A1. As reference I want to use PIN A3 with a voltage of 2.5V.
The help of the PICC-Compiler says, that I shall use the line:
setup_adc_ports( A0_RA1_ANALOGRA3_REF );
But the compiler doesn't work with this line. Lines which are similar to the first one also don't work:
setup_adc_ports( RA0_RA1_ANALOGRA3_REF );
setup_adc_ports( RA0_RA1_ANALOG_RA3_REF );
I don't know what to do. Please help me. |
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Ttelmah
Guest
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| Re: AD-Converter with external reference |
| Posted: Thu Nov 25, 2004 4:19 am |
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| pom wrote: | Hello everybody,
I have a huge problem with using an external reference for AD-converter.
I try to programm a 18F258 to detect a voltage on the PINs A0 and A1. As reference I want to use PIN A3 with a voltage of 2.5V.
The help of the PICC-Compiler says, that I shall use the line:
setup_adc_ports( A0_RA1_ANALOGRA3_REF );
But the compiler doesn't work with this line. Lines which are similar to the first one also don't work:
setup_adc_ports( RA0_RA1_ANALOGRA3_REF );
setup_adc_ports( RA0_RA1_ANALOG_RA3_REF );
I don't know what to do. Please help me. |
The best way to find the syntax, is to look in the include file for the chip. The correct form, is the last one you give (RA0_RA1_ANALOG_RA3_REF), which should work. You need to be including the file 18F258.h, before you can use these text macros.
Best Wishes |
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pom
Joined: 25 Nov 2004
Posts: 30
Location: Germany
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| Thank you. |
| Posted: Thu Nov 25, 2004 10:49 am |
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| Thank you for helping me. It was a very good hint to look it up in the 18F258.h. I didn't realize this possibility. |
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