PIC16F1825 unable to Light an LED

[Lestat]

Hello

I can't seem to find a reason why I am struggling to light an LED tied to Pin 2 (MCE, PORTA.5) of a PIC16F1825.

I have checked the polarity of the LED and also changed it out for LEDs that are working, the resistor is also functioning correctly. When the pin goes high then the LED should light.

Can anybody see a reason why this LED doesn't light?

I am wondering if it's a case of not being able to see the wood for the trees and it is actually something very simple.

clear
DEFINE OSC 32

'PINS 
Current_Pos_In VAR PORTA.4      'RA4    AN3   Pot input for current position
MCE VAR PORTA.5                 'RA5    OUT   Enable H Bridge
SCK_Pin VAR PORTC.0             'RC0    IN    SPI Clock Pin
SDI_Pin VAR PORTC.1             'RC1    IN    SPI Data Input
SDO_Pin VAR PORTC.2             'RC2    OUT   SPI Data Output
SS_Pin VAR PORTC.3              'RC3    IN    SPI Chip Select

'REGISTERS
OSCCON = %11110010
INTCON = %11000000
PIE1 = %01001000
APFCON0 = %00000000
APFCON1 = %00000000
TRISA = %00011111
ANSELA = %00010111
WPUA = %00000000
TRISC = %00001011
ANSELC = %00000000
WPUC = %00000000
ADCON0 = %00001100
ADCON1 = %10100000

'SPI Registers
SSP1STAT = %00000000
SSP1CON1 = %00100100
SSP1CON2 = %00000000
SSP1CON3 = %00010000

'Interrupt Set up
INCLUDE "DT_INTS-14.bas"     ' Base Interrupt System
INCLUDE "ReEnterPBP.bas"     ' Include if using PBP interrupts

;---------------------------------------------------------------------------
wsave   VAR BYTE    $20     SYSTEM      ' location for W if in bank0
;wsave   VAR BYTE    $70     SYSTEM      ' alternate save location for W 
                                         ' if using $70, comment wsave1-3

' --- IF any of these three lines cause an error ?? ------------------------
'       Comment them out to fix the problem ----
' -- Which variables are needed, depends on the Chip you are using -- 
wsave1  VAR BYTE    $A0     SYSTEM      ' location for W if in bank1
wsave2  VAR BYTE    $120    SYSTEM      ' location for W if in bank2
'wsave3  VAR BYTE    $1A0    SYSTEM      ' location for W if in bank3
' --------------------------------------------------------------------------

ASM
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler    SSP1_INT,  _SPI_Com,      PBP,  yes
        INT_Handler    AD_INT,    _Current_Pos,  PBP,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM
 
high mce

Thank you very much.

[Darrel Taylor]

PORTA.5 is an external oscillator pin, and the default configuration is for the HS oscillator.
Changing the OSCCON register to use the internal oscillator does not free the external oscillator pins.

You'll need to set the configuration bits for the internal oscillator to be able to use those two pins.

[Lestat]

Thank you for the response.

Ok. I thought that setting the OSCCON register to use the internal oscillator would have automatically freed those pins up. Right when I am home later I will look at that.

Many thanks