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What am I Missing? 24EP64GP202

 
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gtx15



Joined: 19 May 2018
Posts: 27

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What am I Missing? 24EP64GP202
PostPosted: Wed Oct 16, 2019 6:47 pm     Reply with quote
Just starting to program this device and I can't get it to do anything. I'm able to program it and I'm using 3.3v ps., 32mhz crystal and a VCap from Pin 19 to pin 20. Voltage on pin 2 or 3 is .7v looks like its floating. Any help would be great.
Code:

#include <erase.h>

void main()
{
   //Example blinking LED program
   while(true)
   {
      output_low(LED);
      delay_ms(DELAY);
      output_high(LED);
      delay_ms(DELAY);
   
      output_low(test);
      delay_ms(DELAY);
      output_high(test);
      delay_ms(DELAY);
   }

}

Code:

#include <24EP64GP202.h>
#device ICSP=1

#use delay(crystal=32000000)

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES NOJTAG                   //JTAG disabled
#FUSES CKSFSM                   //Clock Switching is enabled, fail Safe clock monitor is enabled


#use FIXED_IO( A_outputs=PIN_A1 )

#define test   PIN_A1


#define LED PIN_A0
#define DELAY 1000
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Oct 16, 2019 8:27 pm     Reply with quote
gtx15 wrote:
32mhz crystal

Look at page 414 of the PIC data sheet.
http://ww1.microchip.com/downloads/en/DeviceDoc/70000657H.pdf
It shows that for HS mode, the highest crystal frequency it can run is
25 MHz. You need to get a lower frequency crystal.
Ttelmah



Joined: 11 Mar 2010
Posts: 19549

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PostPosted: Thu Oct 17, 2019 2:35 am     Reply with quote
Also, remember the MCLR pin does need to be pulled up.
Depending on your compiler version (recent compiler automatically do
this, but older ones did not), you may need to disable analog functions
before pins can be used for digital I/O. So:

setup_adc_ports(NO_ANALOGS);

or if you are using the ADC just setup the analog pins you are going to use,
before attempting I/O.

Remember you can just run with the internal oscillator, so:

#use delay(INTERNAL=32MHz)

Not as accurate as a crystal, but will allow you to get started.

Key thing is that you can run at 32MHz (or more), with a crystal of 8MHz,
16MHz, 12MHz etc.. Anything that is a multiple of 4MHz, since this can then
be divided to give 4MHz to the PLL, which can then multiply this to
give a frequency between 120, and 340MHz, which can then be divided
by 2, 4 or 8 to feed the CPU.

Final thing though (and the reason it won't work), you are setting PortA
to use 'fixed IO', and then not setting pin A0 as an output. It'll therefore
be programmed as an input, so the LED won't work....
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