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18F2550 ADC AN0,AN1

 
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vtrx



Joined: 11 Oct 2017
Posts: 32

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18F2550 ADC AN0,AN1
PostPosted: Fri May 03, 2019 6:47 am     Reply with quote

I need to use AN0 and AN1 with the ADC and A2 as input.
It seems to me that the code below does not work.

Code:
setup_adc_ports(AN0_to_AN1);
temtronic



Joined: 01 Jul 2010
Posts: 6953
Location: Greensville,Ontario

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PostPosted: Fri May 03, 2019 7:36 am     Reply with quote

hmm..
Quote:
#define AN0_TO_AN1 0x0D // A0 A1

is what I have in the device header, so it 'should' work.

You need to post a small program that fails as well as the compiler version.

Jay
vtrx



Joined: 11 Oct 2017
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PostPosted: Fri May 03, 2019 5:06 pm     Reply with quote

Solved, the microcontroller was faulty on pin4, it was probably when i reversed the ci in the test socket.
vtrx



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PostPosted: Sun May 05, 2019 4:58 am     Reply with quote

Is it possible to use the ADC only on port B (AN11, AN12) and the other pins as input?
temtronic



Joined: 01 Jul 2010
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PostPosted: Sun May 05, 2019 5:07 am     Reply with quote

The answer lies in the 'device header' file ! PICtype.h.... In there will be all the combinations of valid ADC settings, along with everything else.....
You should also read the ADC chapter of the datasheet. Depending on application and I/O pins, there are 'tips and tricks' ,to using ADC pins.
One is that you can use any ADC pin for a digital input. Simply configure the ADC to read that pin, if the value is greater than 250( for 8 bits) then it's a '1' otherwise it's a '0'.
Jay
vtrx



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PostPosted: Sun May 05, 2019 5:13 am     Reply with quote

Can I use fast_io() along with ADC?
If I use set_tris_a(0x11111111) the ADC does not work.
temtronic



Joined: 01 Jul 2010
Posts: 6953
Location: Greensville,Ontario

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PostPosted: Sun May 05, 2019 7:18 am     Reply with quote

show us your code...
setting all of port A to inputs, reconfigures the pin with clko, which 'might' be a problem..it also eliminates Vref-,vref+, another potential problem.
we NEED to see your code to properly advise you.
Jay
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Sun May 05, 2019 11:04 am     Reply with quote

Here is a test program for the ADC on AN0 for the 18F4550:
Code:

#include <18F4550.h>
#device adc=10
#fuses NOWDT, PUT, BROWNOUT, NOLVP
#use delay(internal=4M)
#use rs232(baud=9600, UART1, ERRORS)

//============================
void main()
{
int16 result;

setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_DIV_4);   // See 18F4550 data sheet for divisor
set_adc_channel(0);
delay_us(3);   // This delay is from 18F4550 data sheet

while(TRUE)
  {
   result = read_adc();
   printf("%LX \n\r", result);
   delay_ms(500);
  }

}
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