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CDC BOOTLOADER PROBLEM on PIC18F4550

 
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abiel



Joined: 27 Jan 2011
Posts: 1

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CDC BOOTLOADER PROBLEM on PIC18F4550
PostPosted: Sun Jan 13, 2019 8:04 pm     Reply with quote
Hi every one,

I've been trying to run CDC Bootloader Example based on version 5.076 but so far, i couldn't.
I compile the ex_bootloader.c, I program the 18f4550, that my computer recognize like CDC usb device, but once i write a little sample to program through the CDC bootloader, the MCU doesn't start. It seems like something happens, but i don't know if it is about the fuses or vector reset.
Of course I include the usb_Bootloader.h file in my test Program.

my test example.
Code:

#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN,
#device ADC=10
#use delay(clock=48000000)
 
#include "usb_bootloader.h"
#include "Flex_LCD.C"


void main()
{
set_tris_a(0xff);
set_tris_b(0x00);
set_tris_d(0x00);
set_tris_c(0x00);

//Setup ADC
   setup_adc_ports(AN0);
   setup_adc(ADC_CLOCK_INTERNAL);
   

 

   while(TRUE)
   {
     
      output_low(PIN_B7);
      output_high(PIN_B6);
      delay_ms(500);
      output_low(PIN_B6);
      output_high(PIN_B7);
      delay_ms(500);
   
   }
   }

I've seen some advice from Ttelmah but nothing happens, i hope you can guide me to resolve this.

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Ex_usb_bootloader.c and Ex_usb_common.h code removed.

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Ttelmah



Joined: 11 Mar 2010
Posts: 19551

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PostPosted: Mon Jan 14, 2019 2:51 am     Reply with quote
Some comments:

If this is the code being loaded 'with' a bootloader, then set

#FUSES NONE

The fuses that will be used, are the ones in the bootloader code. You
can't change fuses in the 'runtime' program.

ADC_CLOCK_INTERNAL, is not recommended for a CPU clock above
1Mhz. Read the data sheet and correct this.

Have you got a pull-up on the pin used to trigger the bootloader?. The
runtime code will only be executed with this pin held high.
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