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masterat
Joined: 17 Jul 2010
Posts: 26
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| How to read adc from channels AN6,AN7 at PIC24HJ12GP201? |
 Posted: Wed Apr 17, 2013 1:43 am |
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ccs compiler 4.140
On PIC24HJ12GP201 have 6 channels of analog. I try to read adc from channel AN0,AN1,AN2 and AN3 successfully but on channel AN6,AN7 cannot. Please advise.
this is some header file about adc.
| Code: | // Constants used in SETUP_ADC_PORTS() are:
// First argument:
// OR together desired pins
#define NO_ANALOGS 0 // None
#define ALL_ANALOG 0xFFFFFFFF // All
#define sAN0 0x00000001 //| A0
#define sAN1 0x00000002 //| A1
#define sAN2 0x00000004 //| B0
#define sAN3 0x00000008 //| B1
#define sAN4 0x00000010 //| B15
#define sAN5 0x00000020 //| B14 |
And this my code
| Code: |
#include <24HJ12GP201.h>
#device adc=12
#fuses FRC,NOWDT,NOPROTECT_HIGH,NODEBUG,NOBSS,NOPUT,NOJTAG,NOWRT
#fuses OSCIO,NOIESO,NOPR,NOALTI2C,NOWRTB
#fuses NOIOL1WAY,NOCKSFSM,NOWINDIS
#use delay(clock=80M,internal)
#use standard_io(all)
unsigned long result1,result2,result3,result4,result6;
void main()
{
setup_oscillator(OSC_INTERNAL);
set_tris_a(0b0000000000000011);
set_tris_b(0b1000000000000011);
setup_adc_ports( sAN0|sAN1|sAN2|sAN3|sAN4|sAN5|VSS_VDD);
setup_adc(ADC_CLOCK_DIV_64);
while(TRUE)
{
set_adc_channel(0); //read from channel 0
delay_ms(2);
result1=read_adc();
delay_ms(10);
set_adc_channel(1); //read from channel 1
delay_ms(2);
result2=read_adc();
delay_ms(10);
set_adc_channel(2); //read from channel 2
delay_ms(2);
result3=read_adc();
delay_ms(10);
set_adc_channel(3); //read from channel 3
delay_ms(2);
result4=read_adc();
delay_ms(10);
set_adc_channel(4); //read from channel 4
delay_ms(2);
result5=read_adc();
delay_ms(10);
set_adc_channel(5); //read from channel 5
delay_ms(2);
result6=read_adc();
delay_ms(10);
.
.
}
}
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alan
Joined: 12 Nov 2012
Posts: 357
Location: South Africa
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| Posted: Wed Apr 17, 2013 3:50 am |
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You didn't enable the analog channel on AN6 & AN7
| Code: |
setup_adc_ports( sAN0|sAN1|sAN2|sAN3|sAN4|sAN5|VSS_VDD);
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Should be
| Code: |
setup_adc_ports( sAN0|sAN1|sAN2|sAN3|sAN6|sAN7|VSS_VDD);
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and also you are reading from Analog channels 4&5 they should be 6 & 7. |
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masterat
Joined: 17 Jul 2010
Posts: 26
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| How to read adc from channels AN6,AN7 at PIC24HJ12GP201? |
| Posted: Wed Apr 17, 2013 6:30 am |
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Thank you , alan for your prompt reply .
But I understand that in PIC24HJ12GP201 head file is declare for AN6=sAN4 and AN7=sAN5 or have something wrong? |
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alan
Joined: 12 Nov 2012
Posts: 357
Location: South Africa
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| Posted: Wed Apr 17, 2013 7:09 am |
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Errr no......
sAn6 and sAN7 are for AN6 & 7 respectivly accordind to my CCS header file. |
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masterat
Joined: 17 Jul 2010
Posts: 26
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| Posted: Wed Apr 17, 2013 7:29 pm |
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I try change to sAN6,sAN7 compiler error "Undefined identifier sAN6 sAN7 "
This is my 24HJ12GP201 Header file list
| Code: |
//////// Standard Header file for the PIC24HJ12GP201 device ////////////////
// Constants used in SETUP_ADC_PORTS() are:
// First argument:
// OR together desired pins
#define NO_ANALOGS 0 // None
#define ALL_ANALOG 0xFFFFFFFF // All
#define sAN0 0x00000001 //| A0
#define sAN1 0x00000002 //| A1
#define sAN2 0x00000004 //| B0
#define sAN3 0x00000008 //| B1
#define sAN4 0x00000010 //| B15
#define sAN5 0x00000020 //| B14
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+++++++++++++++++++++++
Most header file lines deleted.
Reason: Forum rule #10
10. Don't post the CCS example code or drivers. This includes header files for devices (example 18f452.h).
Forum rules:
http://www.ccsinfo.com/forum/viewtopic.php?t=26245
- Forum Moderator
+++++++++++++++++++++++ |
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jeremiah
Joined: 20 Jul 2010
Posts: 1355
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| Posted: Wed Apr 17, 2013 9:44 pm |
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One major rule here is never post CCS supplied code in the forum (device files, driver files, example files, etc.).
The file you have is incomplete. You should report it to CCS support via the email address provided on their web page so they can fix it.
In the mean time, take a look at AD1PCFGL register in the data sheet and compare it to the sAN values in the .h file you posted. You should quickly see a pattern in how they are defined vs how the register expects them to be. You could theoretically add the additional values to the .h file this way. |
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masterat
Joined: 17 Jul 2010
Posts: 26
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| Posted: Thu Apr 18, 2013 2:28 am |
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| Thank you jeremiah, and sorry for my foolish post about header file. Now I can use all adc analog input by you hint. |
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