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18F4620 and AN12 setup

 
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Linuxbuilders



Joined: 20 Mar 2010
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18F4620 and AN12 setup
PostPosted: Sun Feb 19, 2012 3:45 am     Reply with quote
Hi, I have a problem:
I use in my circuit AN0 to AN4 and then AN12

So to set it up I use:
Code:

setup_adc_ports(AN0_TO_AN4 | VSS_VDD); //set AD ports AN0 to AN4

How do I get AN12 setup if 18F4620.h does not have this option? I cannot set up ALL because I use other pins as I/O pins. I use external OSC too.
Is there any way I could do this part manually? If there is please could you help and put detailed instruction bit by bit. I have never done it before and I have no clue where to look for an answer. If there is any way to do it manually by registry modification I would like to ask for detailed examples, I do not know ASM so I depend on .h files.

Thank you

Code:

// Constants used in SETUP_ADC_PORTS() are:
// First argument:
#define NO_ANALOGS   0x0F   // None
#define ALL_ANALOG   0x00   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3 B1 B4 B0     
#define AN0_TO_AN11  0x03   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3 B1 B4       
#define AN0_TO_AN10  0x04   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3 B1         
#define AN0_TO_AN9   0x05   // A0 A1 A2 A3 A5 E0 E1 E2 B2 B3             
#define AN0_TO_AN8   0x06   // A0 A1 A2 A3 A5 E0 E1 E2 B2               
#define AN0_TO_AN7   0x07   // A0 A1 A2 A3 A5 E0 E1 E2                   
#define AN0_TO_AN6   0x08   // A0 A1 A2 A3 A5 E0 E1                     
#define AN0_TO_AN5   0x09   // A0 A1 A2 A3 A5 E0                         
#define AN0_TO_AN4   0x0A   // A0 A1 A2 A3 A5
#define AN0_TO_AN3   0x0B   // A0 A1 A2 A3
#define AN0_TO_AN2   0x0C   // A0 A1 A2
#define AN0_TO_AN1   0x0D   // A0 A1
#define AN0          0x0E   // A0

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dyeatman



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PostPosted: Sun Feb 19, 2012 8:07 am     Reply with quote
Look at datasheet page 224 (register 19.2) to explain why you can't do that.
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