Hello everyone,

Thank you, Ken, for the calculator, I tested the values with your Excel spreadsheet and indeed the value is 25. But I think it wouldn't be such a problem if the value is not so precise, because I think only the error level would be greater, but the transmission would still function. Is it correct ? Now, having set the correct baud rate, the program still doesn't want to function.
Please give me a hint of what is wrong. The code is:

Initialisation of USART:

unsigned char
sci_Init(unsigned long int baud, unsigned char ninebits)
{
        BRGH = 1;       /* high baud rate */
        SPBRG = 0x19;   /* set the baud rate */

        SYNC = 0;       /* asynchronous */
        SPEN = 1;       /* enable serial port pins */
        CREN = 1;       /* enable reception */
        SREN = 0;       /* no effect */
        TXIE = 0;       /* disable tx interrupts */
        RCIE = 1;       /* enable rx interrupts */
        TX9  = ninebits?1:0;    /* 8- or 9-bit transmission */
        RX9  = ninebits?1:0;    /* 8- or 9-bit reception */
        TXEN = 1;       /* enable the transmitter */

        return 0;
}

plus

        PIR1 = 0;       /* clear any pending interrupts */
        PEIE = 1;       /* enable perhipheral interrupts */
        T0IE = 1;       // Enable the Timer0 interrupt
        GIE = 1;        // Enable interrupts
        RCIE = 1;       /* enable receiver interrupt */

in main init stuff.

ISR:

        if(RCIF) {
                led2_on();
                receivebuffer[RecvBufferPos] = RCREG;   /* RXD9 and FERR are gone now */

                if ((++RecvBufferPos)==MAXRECEIVEBUFFER) RecvBufferPos = 0;
                led2_off();
        }
        if(TXIF && TXIE)
        {
                led1_on();
                TXREG = sendbuffer[SendBufferPos];
                if ((++SendBufferPos)==MAXSENDBUFFER) SendBufferPos=0;
                led1_off();
        }
        sci_CheckOERR();

I will try as Jan-Erik said to simplify the code and test it until it runs. The led procedures are correct, because I test them at the beginning of the program. I use procedures because I need to modify some bits in a status byte too. Do you guys see any mistake in this code ? Or any omission ? I am sure that if it is, you will see it long before me ;-)

Lucian


PS: It seems that the interrupts are not functioning and the ISR is not sending and receiving the data when checked RCIF and TXIF. I believe this because when i test sendbufferfull in ISR instead of TXIF & TXIE, it sends the data, but it isn't received, though Rx is connected to Tx. Why might this happen ?



Lucian


----

Home, no matter how far...
http://www.home.ro

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads