Hi:

I want to get started with the PIC24 platform, and recently got a few 24HJ128GP502 chips and wrote a testing program (attached) with the C30 C compiler/MPLAB to toggle the PORTB pins quickly.

I'm using a PICKit 2 (via ICSP) to program the chip, but I've been unable to run it just by powering it up and raising MCLR to Vcc. Instead, I've had to select PICKit 2 in MPLAB and then run the program in debug mode in order to see any output on the PORTB pins.

The code runs flawlessly when it is in debug mode; the internal RC oscillator and PLL work correctly and I/O pins strobing at the right frequency.

Right now, I'm just trying to set up the environment and figure out how to get code running, so I really don't know what's wrong with my setup. How do I run my code without having to put the chip into hardware debug?

I'm using the latest versions of all software:
MPLAB 8.15a
C Compiler for PIC24 MCUs 3.11(b) student edition

(I'm a high school student trying to get started with the PIC24 platform for doing some robot work. I had been using the 18F2550 previously, but I needed to take in lots of servo PWM input pulses and liked the convenience of hardware capture peripherals with interrupts.)

Many thanks,
Xo Wang

/* test.c */
#include <p24Hxxxx.h>
#include <libpic30.h>

/*************************************************************** Config fuses */
/* Various code protections off */
_FBS(0xFFFF)
_FSS(0xFFFF)
_FGS(0xFFFF)
/* Two-speed oscillator startup disabled, FRC oscillator w/ divide and PLL */
_FOSCSEL(FNOSC_FRCPLL & IESO_OFF)
/* Multiple I/O remap, OSC2 is clock out, Primary oscillator disabled,
Clock switching and clock monitor disabled */
_FOSC(FCKSM_CSDCMD & IOL1WAY_OFF & OSCIOFNC_OFF & POSCMD_NONE)
/* WDT disabled */
_FWDT(0xFFFF)
/* I2C mapped to SDA1/SCL1, Power-on Reset Timer Disabled */
_FPOR(ALTI2C_OFF & FPWRT_PWR1)
/* Debug stuff */
_FICD(BKBUG_ON & COE_ON & JTAGEN_OFF & ICS_PGD1)

/*********************************************************************** Main */
int main(void) {
    OSCCON = 0x1100; OSCTUN = 0x0013; /* Set FRC at 8 Mhz */
    PLLFBD = 0x0026; /* PLL at 40x, bring FOSC to 40 MHz */
    CLKDIV = 0x0000; /* do not divide FRC, PLL pre/post both at 1/2 */
    
    AD1PCFGL = 0xFFFF; /* set ADC1 pins to digital */
    TRISB = 0; /* configure PORTB for output */
    
    while(1) {
        LATB = ~LATB;
        __delay32(606);
    }
    return 0;
}



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