PIC32MX795F512L doesn't working on my board though it's getting programed

Community General Discussions
1

Hello everyone ! 
  
I am trying to program PIC32MX795F512L on by own board using PICKIT3. The schematic of the board is attached.  

schematic.jpg

I am getting the following error when I select the programmer.  
  
PICkit 3 detected 
Connecting to PICkit 3… 
Running self test… 
Self test passed 
Firmware Suite Version… 01.25.10 
Firmware type…PIC32MX 
PICkit 3 Connected. 
Target Detected 
Target Device ID (0000e000) does not match expected Device ID (04307053). 
  
I can see that the PIC is sending out some non-zero bits through oscilloscope on the PGD2 pin, and it is consistent over runs. Still MPLAB is giving the above all zero id error. 
  
Also, if I program in release mode, I am getting success as mentioned below… but the pic is not operational. I have tried in two separate boards but with no luck. 
Programming…Programming/Verify complete 
  
My configuration bits are as follows 
  
#ifndef OVERRIDE_CONFIG_BITS            
#pragma config UPLLEN   = ON            // USB PLL Enabled    
#pragma config FPLLMUL  = MUL_20        // PLL Multiplier    
#pragma config UPLLIDIV = DIV_2         // USB PLL Input Divider    
#pragma config FPLLIDIV = DIV_2         // PLL Input Divider    
#pragma config FPLLODIV = DIV_1         // PLL Output Divider    
#pragma config FPBDIV   = DIV_1         // Peripheral Clock divisor    
#pragma config FWDTEN   = OFF           // Watchdog Timer     
#pragma config WDTPS    = PS1           // Watchdog Timer Postscale    
#pragma config FCKSM    = CSDCMD        // Clock Switching & Fail Safe Clock Monitor    
#pragma config OSCIOFNC = OFF           // CLKO Enable    
#pragma config POSCMOD  = HS            // Primary Oscillator    
#pragma config IESO     = OFF           // Internal/External Switch-over    
#pragma config FSOSCEN  = OFF           // Secondary Oscillator Enable    
#pragma config FNOSC    = PRIPLL        // Oscillator Selection    
#pragma config CP       = OFF           // Code Protect 
#pragma config BWP      = OFF           // Boot Flash Write Protect    
#pragma config PWP      = OFF           // Program Flash Write Protect    
#pragma config ICESEL   = ICS_PGx2      // ICE/ICD Comm Channel Select    
#pragma config DEBUG    = OFF           // Debugger Disabled for Starter Kit             
#endif // OVERRIDE_CONFIG_BITS 
  
Another observation: 
When I check OSC2 pin through oscilloscope, I see an oscillation@7MHz instead of 8MHz. Any idea on why the frequency is decreased will be of great help. I have attached a snapshot of the board too for your reference. 

1.jpg

2.jpg


Thanks in advance.

Much appreciated.

2

Pickit3

By default the pickit software will not burn the flash memory unless the board ID and the firmware file ID match. Your 2 ID’s are quite different.

I am mostly a PIC24 user and the internal oscillators default to somewhere in the 7.x MHz range. 

3

mismatched id’s

I know even less then ggallant about those chips.  But it looks to me like the bad id is in the hex file.  I would check the compiler settings for device type,  this could also explain setting the target to a default speed.

Good Luck,

RG