Yes, SDO and SDK are both set as output. I have found my problem, changes in SDO and SDK are so fast that I cannot see them in my oscilloscope (Ups!). Thanks you all, regards, Carlos -----Original Message----- From: Jennifer Loiacono To: PICLIST@MITVMA.MIT.EDU Date: jueves 7 de febrero de 2002 14:55 Subject: Re: [PIC]: 18c452 - Master mode SPI sends no data >Are SDO and SCK both set as output (0) in the TRIS register? > >> -----Original Message----- >> From: pic microcontroller discussion list >> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of K=FCbek Tony >> Sent: Thursday, February 07, 2002 5:45 AM >> To: PICLIST@MITVMA.MIT.EDU >> Subject: Re: [PIC]: 18c452 - Master mode SPI sends no data >> >> >> Hi, >> here are some code that works on an 16F87x, should be minor >> differences with the 18xx. >> Although it uses fsr to access the config regs ( not >> advicable by Mchip ) >> I don't se any reason for it not to work. >> >> /Tony >> >> >> ; >> ************************************************************** >> ********* >> ; >> ; INIT_SPI - Initialises SPI, module, full speed, master >> mode, idle clock >> low >> ; does NOT enable SPI interrupts ( use polling ) >> ; Can be at any bank at entry, leaves ram bank setting >> intact at exit. >> >> INIT_SPI >> ; make sure pins are setup before calling this routine >> ; TRISC:5 and TRISC:3 must be cleared ( as for input, >> but operates >> as outputs ) >> ; furthermore its advised that interrupts are >> disabled during this >> routine >> >> ; setup SPI status reg >> MOVLW SSPSTAT ; get adress for synch serial port status reg >> MOVWF FSR ; setup fsr >> MOVLW 0x00; (1<> MOVWF INDF ; and store it >> >> ; setup SPI control reg >> MOVLW SSPCON ; get adress for synch serial port control reg >> MOVWF FSR ; setup fsr >> MOVLW ((1<> syncronous port, >> idle clock is high,speed XTAL/16 >> MOVWF INDF ; and set it >> >> >> ; make sure SPI interrupts are disabled >> MOVLW PIE1 ; get adress for periphial irq's >> MOVWF FSR ; setup fsr >> BCF INDF,SSPIE ; 'disable' reciever irq >> >> RETURN >> >> ; >> ************************************************************** >> ********* >> ; >> ; SPI_XFER_BYTE - sends ( and receives ) one byte , by using h/w SPI >> ; Byte to send in W, returns with received data in W >> ; >> SPI_XFER_BYTE >> MOVWF SSPBUF ; put out byte for sending >> ; initiate an send seq. >> MOVLW SSPSTAT ; get adress for SPI status >> MOVWF FSR ; setup FSR >> SPI_XFER_LOOP >> BTFSS INDF,BF ; check for tx complete >> GOTO SPI_XFER_LOOP ; nope >> MOVF SSPBUF,W ; get received byte >> RETURN ; and return >> >> -- >> http://www.piclist.com hint: The list server can filter out subtopics >> (like ads or off topics) for you. See http://www.piclist.com/#topics >> >> > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics