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krugger
Joined: 12 Jul 2011
Posts: 18
Location: El Salvador
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| PIC16F1827 Wrong header file? |
 Posted: Tue Jul 12, 2011 11:59 pm |
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This is my first post so first of all I'd like to say Hello to everybody.
Said this, I've found a problem while using PIC16F1827.
I want to use 6 of its AN channels (from AN2 to AN7, both included) for my application.
In the Microchip's Datasheet for the product we can see the following graph:
http://imageshack.us/photo/my-images/6/pic16f1827pinconfig.jpg
In which we can see that AN channels are, in order from AN0 to AN11, mapped on ports: A0, A1, A2, A3, A4, B6, B7, B5, B4, B3, B2, B1.
However, in the compiler header file PIC16F1827.h we can see the following code:
| Code: | // Constants used in SETUP_ADC_PORTS() are:
#define ALL_ANALOG 0xffff0007 // A0 A1 A2 A3 A5 E0 E1 E2 B0 B1 B2 B3 B4 B5
#define sAN13 0x20000000 // B5
#define sAN12 0x01000000 // B0
#define sAN11 0x10000000 // B4
#define sAN10 0x02000000 // B1
#define sAN9 0x08000000 // B3
#define sAN8 0x04000000 // B2
#define sAN7 0x40000 // E2
#define sAN6 0x20000 // E1
#define sAN5 0x10000 // E0
#define sAN4 0x20 // A5
#define sAN3 0x8 // A3
#define sAN2 0x4 // A2
#define sAN1 0x2 // A1
#define sAN0 0x1 // A0
#define NO_ANALOGS 0x00000 // None
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In which we observe 13 AN channels (instead of 11), some of them mapped in non existent ports and what is worst, PORT A4 is not configured as an available AN channel (it should be AN channel #4).
I'd rather use exactly AN2 to AN7 because I need to read them sequentially and it's easier for me to do that if they're next to each other, but also because I need the other ports to configure 2 SPIs to control an external SRAM serial memory and a RF module.
Does anyone know if I'm correct with my supposition of the wrong header? If I'm, does anyone know how could/should I proceed to modify PIC16F1827.h?
Thank you all in advance for your time and help and sorry for any mistake concerning my english.
Pablo |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19498
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| Posted: Wed Jul 13, 2011 2:28 am |
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Always post the compiler version for a compiler problem.
The table is like you show, up to about 4.112, but is correct in 4.114. The actual numbers used also change, so your best bet is to moan at CCS, they may give you an upgrade to a version with this fixed (should....).
I doubt if just changing the table would work, since the numeric format is also changed, suggesting the coding for the setup is probably wrong as well.
Best Wishes |
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krugger
Joined: 12 Jul 2011
Posts: 18
Location: El Salvador
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| Posted: Wed Jul 13, 2011 8:44 am |
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| Thank you very much Ttelmah! |
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