PIC32 - T795 - problem running a programm

Started by tome.matos, January 15, 2014, 05:16:56 AM

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Hi all !

I'm having some trouble when I try do run a simple blinking led (LED1 - RB15) program in the microcontroller. It has been programmed with the Duinomite Bootloader.
I'm using the USB Bootloader application to send the .hex file but then I can't execute my program and I don't understand why.

Any help please?



Possibly you are compiling in debug mode?
Did you set the needed ports to digital?


I'm using MPLAB and I've just built the project, not in debug mode.

Here's my code:

#include <p32xxxx.h>
#include <plib.h>

#define SYSCLK 80000000L // System clock frequency, in Hz

void delay (unsigned);
int main(int argc, char** argv)
    // Set B15 as digital outpout
      TRISBbits.TRISB15 = 0;

    // Loop
    while (1) {
        // Toggle B15
        PORTBbits.RB15 = !PORTBbits.RB15;

        delay(250); // wait 250ms

    return (EXIT_SUCCESS);

void delay (unsigned int n_intervals)
   volatile unsigned int i;
   int CALIBRATION_VALUE = 10000;
   for(; n_intervals != 0; n_intervals--)
      for(i = CALIBRATION_VALUE; i != 0; i--)

I've already tryed to run this same programm in a PIC32 with Microchip Bootloader and it runs perfectly but in this I can't say the same...


Maybe any of these:
you've not set any clocks
config fuses
linker (ld) input
assuming reading an output pin will do what you want



RB15 is by default an analog pin - so you have to turn off the analog function for it.
Try looking up the commands for ANSELA and PORTSetPinsDigital etc.


Thanks for the feedback guys!

Although I still couldn't solve the problem.
I don't have the linker file. How may I get it ?


Must be somewhere in MPLAB.  Hunt around.



normally it's in Microchip\mplabc32\v2.02\pic32mx\lib\ldscripts
actually, the compiler should find it without any special effort - if the installation was correct.
Maybe it would help to re-install the compiler.
What is the actual 'build' output?


I've already found the linker ld.
The 'build' output is:

make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-conf
make[1]: Entering directory `C:/Users/Tome/Desktop/Universidade/5Ano/Tese/Projecto/Software/Firmware/sample-programs/LedBlink.X'
make  -f nbproject/Makefile-default.mk dist/default/production/LedBlink.X.production.hex
make[2]: Entering directory `C:/Users/Tome/Desktop/Universidade/5Ano/Tese/Projecto/Software/Firmware/sample-programs/LedBlink.X'
make[2]: `dist/default/production/LedBlink.X.production.hex' is up to date.
make[2]: Leaving directory `C:/Users/Tome/Desktop/Universidade/5Ano/Tese/Projecto/Software/Firmware/sample-programs/LedBlink.X'
make[1]: Leaving directory `C:/Users/Tome/Desktop/Universidade/5Ano/Tese/Projecto/Software/Firmware/sample-programs/LedBlink.X'

BUILD SUCCESSFUL (total time: 134ms)
Loading code from C:/Users/Tomé/Desktop/Universidade/5º Ano/Tese/Projecto/Software/Firmware/sample-programs/LedBlink.X/dist/default/production/LedBlink.X.production.hex...
Loading symbols from C:/Users/Tomé/Desktop/Universidade/5º Ano/Tese/Projecto/Software/Firmware/sample-programs/LedBlink.X/dist/default/production/LedBlink.X.production.elf...
Loading completed

Whats making me confused is the that I can run the problem perfectly in another microcontroller with the same microprocessor (PIC32MX795F512H) ...

A question: the PIC32 T795 should be detected in a USB port without being in the update mode?


It will not be seen as a USB device unless it your user code sets it up correctly to do that.

(USB is optional, via software.)



Hey Tome,

I tried your code – with the proper linker script I managed to upload it to the board via the bootloader application. However, the desired blink effect didn't work here either.

The code seems correct but I feel like the problem is related either to configuration bits of the project or to the compiler. As long as the bootloader application is able to upload to the board then the linker script should be ok. I believe the problem is somehow related to the code (despite that the initialization and the toggling part seem correct) but I was unable to fix it.

Best regards,
Technical support and documentation manager at Olimex