Using hardware USART in PIC16F876A

[ArtemisGoldfish]

	BSF STATUS,RP0
	MOVLW 0x06 ;All port A as digital
	MOVWF ADCON1
	MOVLW 0x00 ;All port A as output
	MOVWF TRISA
	MOVLW 0x25 ;SSPEN bit set, SPI Slave selected
	MOVWF SSPCON
	BCF TRISC,5 ;Setting PORTC in/out as required
	BSF TRISC,3
	BSF TRISC,4
	BCF STATUS,RP0
loop:	CALL cpy
	BTFSC 0x20,0
	COMF PORTA
	GOTO loop
cpy:	BSF STATUS,RP0
	MOVF SSPSTAT,0
	BCF STATUS,RP0
	MOVWF 0x20
	RETURN
	END

Well, that's my filthy, awful code. There's an LED on a PORTA pin, so I just COMF the whole register whenever the BF flag is set. The only point to this program is just to see if it'll work with a serial interface like a PC, it waits around for a single character to be sent, and the LED turns on. Not as easy as it sounds, hahah.
Anyone have some experience with serial interfacing with this chip?

 

[Pommie]

To receive from the PC you need to set it up as Asynchronous. Check out Nigel's tutorial 7.7 for details.

Mike.

 

[ArtemisGoldfish]

Okaaaaay, I went through the tutorial and I made this code from it

init:	BSF STATUs,RP0
	MOVLW b'11000000'
	MOVWF TRISC
	MOVLW 0x06
	MOVWF ADCON1
	MOVLW d'129'
	MOVWF SPBRG
	MOVLW b'00100100'
	MOVWF TXSTA
	BCF STATUS, RP0
	MOVLW b'10010000'
	MOVWF RCSTA
	MOVLW d'54'
loop:	BTFSS PIR1,TXIF
	GOTO loop
	MOVWF TXREG
	GOTO loop
	END

And the simulator works internally, but it never makes it to the output pins (Even on the real eval board)