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sorasit46
Joined: 07 May 2007
Posts: 69
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| How to setup ADC port on 16F819 ? |
 Posted: Tue Mar 13, 2018 8:22 am |
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Hi!
I am using AN4 for analog input signal.
| Code: |
#include <16F819.h>
#device adc=10
#FUSES INTRC_IO,WDT
#FUSES NOPUT,NOMCLR,NOBROWNOUT,NOLVP,NOCPD,NOWRT,NODEBUG,NOPROTECT
#use delay(clock=4000000)
#byte OSCCON = 0x8F
#use fast_io(A)
#use fast_io(b)
float Vreadch;
int1 led1,led2;
void main()
{
setup_oscillator(OSC_4MHZ);
disable_interrupts(GLOBAL);
setup_timer_0(RTCC_DIV_8);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_adc_ports(AN4);
port_b_pullups(TRUE);
setup_spi(FALSE);
set_tris_A(0b00010000);
set_tris_b(0b00000000);
setup_wdt (WDT_2304MS);
while (true)
{
set_adc_channel(4);delay_us(20);
Vreadch = read_adc();delay_us(20);
restart_wdt();
}
} |
Compile report
***Error12"wash.c"Line26[18,21]:Undefined Identifier AN4
How to set up port for AN4 pin ?
Best regard |
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gaugeguy
Joined: 05 Apr 2011
Posts: 303
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| Posted: Tue Mar 13, 2018 8:38 am |
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| Open the 16F819.h file and look at the constants allowed for the setup_adc_ports function. |
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sorasit46
Joined: 07 May 2007
Posts: 69
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| Posted: Tue Mar 13, 2018 5:22 pm |
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| gaugeguy wrote: | | Open the 16F819.h file and look at the constants allowed for the setup_adc_ports function. |
16f819.h
| Code: |
// Constants used in SETUP_ADC_PORTS() are:
#define NO_ANALOGS 7 // None
#define ALL_ANALOG 0 // A0 A1 A2 A3 A4
#define AN0_AN1_AN2_AN4_VSS_VREF 3 // A0 A1 A2 A4 VRefh=A3
#define AN0_AN1_AN3 4 // A0 A1 A3
#define AN0_AN1_VSS_VREF 5 // A0 A1 VRefh=A3
#define AN0_AN1_AN4_VREF_VREF 0x08 // A0 A1 A4 VRefh=A3 VRefl=A2
#define AN0_AN1_VREF_VREF 0x0D // A0 A1 VRefh=A3 VRefl=A2
#define AN0 0x0E // A0
#define AN0_VREF_VREF 0x0F // A0 VRefh=A3 VRefl=A2
#define ANALOG_RA3_REF 0x1 //!old only provided for compatibility
#define RA0_RA1_RA3_ANALOG 0x4 //!old only provided for compatibility
#define RA0_RA1_ANALOG_RA3_REF 0x5 //!old only provided for compatibility
#define ANALOG_RA3_RA2_REF 0x8 //!old only provided for compatibility
#define RA0_RA1_ANALOG_RA3_RA2_REF 0xD //!old only provided for compatibility
#define RA0_ANALOG 0xE //!old only provided for compatibility
#define RA0_ANALOG_RA3_RA2_REF 0xF //!old only provided for compatibility |
That means I'm not able to set just AN4 pin or not.
Thk. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 13, 2018 6:09 pm |
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That's correct. You can't do it with that PIC.
I suggest you switch to the 16F1847 which can use individual pins for A/D.
However, it requires a Pickit3, ICD3 or higher to program it. |
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sorasit46
Joined: 07 May 2007
Posts: 69
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| Posted: Tue Mar 13, 2018 6:40 pm |
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| Thank you |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19535
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| Posted: Wed Mar 14, 2018 2:07 am |
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| and (of course), understand that this is not something that CCS are forcing, it is dependant on the capabilities of the PIC itself. This is why we repeat 'read the data sheet'.... |
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