Serial not working - Peripheral Pin Select

[Timmymna]

Hi,
I am modifying a **broken link removed** but need use of the PMP so I'm having to do a bit of rewiring, mainly moving the UART pins from RP8 & 9 but this is where I'm running into problems.

I can get the PIC to transmit to the PC but the PIC won't respond to anything from the PC. I am using the sample code which is a serial repeater, thing works fine but when I switch to RP2 & 3 it doesn't reply.

Original code

	RPINR18bits.U1RXR = 9;		// Make Pin RP9 U1RX
	RPOR4bits.RP8R = 3;		// Make Pin RP8 U1TX

	PADCFG1 = 0xFF;			// Make analog pins digital 

	LATB = 0x0;
	TRISB = 0x0FFF;			// Configure LED pins as output

	TMR1 = 0;			// Clear timer 1
	PR1 = 0x3D09;			// Interrupt every 250ms
	IFS0bits.T1IF = 0;		// Clear interrupt flag
	IEC0bits.T1IE = 1;		// Set interrupt enable bit
	T1CON = 0x8030;			// Fosc/4, 1:256 prescale, start TMR1

	TRISB = 0x0300;

	U1BRG  = BRGVAL;
	U1MODE = 0x8000; 		// Reset UART to 8-n-1, alt pins, and enable 
	U1STA  = 0x0440; 		// Reset status register and enable TX & RX
	_U1RXIF=0;			// Clear UART RX Interrupt Flag

Modified code

	RPINR18bits.U1RXR = 3;		// Make Pin RP3 U1RX
	RPOR1bits.RP2R = 3;		// Make Pin RP2 U1TX

	PADCFG1 = 0xFF;			// Make analog pins digital 

	LATB = 0x0;
	TRISB = 0x0FFF;			// Configure LED pins as output

	TMR1 = 0;			// Clear timer 1
	PR1 = 0x3D09;			// Interrupt every 250ms
	IFS0bits.T1IF = 0;		// Clear interrupt flag
	IEC0bits.T1IE = 1;		// Set interrupt enable bit
	T1CON = 0x8030;			// Fosc/4, 1:256 prescale, start TMR1

	TRISB = 0x000C;

	U1BRG  = BRGVAL;
	U1MODE = 0x8000; 		// Reset UART to 8-n-1, alt pins, and enable 
	U1STA  = 0x0440; 		// Reset status register and enable TX & RX
	_U1RXIF=0;			// Clear UART RX Interrupt Flag

This is the first time using the 24F series and the microchip compiler so I might be making an obvious mistake but I can't see anything.

Thanks

 

[Timmymna]

I forgot to mention, I have removed switch 2 and I'm just wiring the TX/RX pins to the ones I want on the PIC, testing the PIC pins with a logic analyser. The PIC will transmit but when the RX pin is connected, the PIC is pulling the pin low.