Hi all,

I am using pic24FJ256GB110 and RD9 pin doean't want to function as input. I=
 tested the same pin works as output. normally
when other modules are available on same pin needs to be disabled. in my ca=
se DPLN external USB OTG transceiver needs to be disabled.
what I did is the fallowing:

remap RD9 =A0to UART 4 and I am using macro to do the job: I know this macr=
o works because I have 3 more uarts working
// Remap UART4 to Ra232 RX
=A0 =A0 =A0 =A0 iPPSInput(IN_FN_PPS_U4RX,IN_PIN_PPS_RP4);// U4RX to pin =A0=
RD9 RP4 =A0"RS232 RX"
=A0=A0
=A0 // rs232

=A0 =A0 =A0 =A0 TRISDbits.TRISD9 =3D 1; =A0 // D9 input =A0RS232 RX RP4/ CN
=A0 =A0 =A0 =A0 CNPU4bits.CN54PUE =3D 1; =A0// enable pullup
// Disable DMLN and DPLN =A0Pull up / pull down resistors
=A0U1OTGCONbits.DMPULDWN =3D 0;
=A0U1OTGCONbits.DMPULUP =3D 0;
=A0U1OTGCONbits.DPPULUP =3D 0;
=A0 =A0 =A0 =A0 U1OTGCONbits.DMPULDWN =3D 0;
=A0 =A0 =A0 =A0 U1OTGCONbits.OTGEN =3D 0;
=A0 =A0 =A0 =A0 U1PWRCbits.USBPWR =3D 0;
=A0 // disable USB just to test
=A0 =A0 =A0 =A0 U1CNFG2bits.UTRDIS =3D 0;
=A0 =A0 =A0 =A0 U1CONbits.USBEN =3D 0;

just a while ago I turned off everything and I am only checking input pin s=
till it didn't work.=A0


=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 while(1)
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 { =A0 =A0
if(PORTDbits.RD9=A0=3D=3D0)
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0{
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 RLED_ON;
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 }
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 }

now I know for sure:
1. the hardware is good I tested as output it can toggle
2. the only suspect goes to is=A0DPLN=A0and I am not 100% sure I turned off

I just added :
LATDbits.LATD9 =3D 1;


I see pull up got enabled but it still doesn't work.=A0

any idea?

thanks

Andre
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