PIC18F UART Issue

[AtomSoft]

All i get is gibberish... or HIGH values like 0xE0 or higher...

Im going for a 40MHz using PLL and a 10MHz OSC... Its not a hardware problem as i had this board working before using some other code... (LOST)

So am i setting this all up ok? Any Thoughts?

Im trying for 19200bps 8-N-1

Thanks Guys/Gals

#pragma config OSC = HSPLL, BOREN = OFF, WDT = OFF, MCLRE = OFF, LVP = OFF, XINST = ON

/******************************************************************************/
/* User Global Variable Declaration                                           */
/******************************************************************************/


/******************************************************************************/
/* Main Program                                                               */
/******************************************************************************/

void main(void)
{
    unsigned char var;
    /* Configure the oscillator for the device */
    ConfigureOscillator();

    /* Initialize I/O and Peripherals for application */
    InitApp();

    /* TODO <INSERT USER APPLICATION CODE HERE> */

    while(1)
    {
        var = getChar();
    }

}

void ConfigureOscillator(void)
{
    // 40MHZ - 10MHZ * 4xPLL
    OSCCON = 0;                 //Primary OSC Selected
    while(!OSCCONbits.OSTS);    //Wait until Primary OSC is ready and running

    ADCON0 = 0;
    ADCON1 = 0x0F;
    CMCON = 0x07;
}

void InitApp(void)
{
    //Enable UART 19200,8-N-1
    RCSTAbits.SPEN = 1;
    TRISC |= 0b11000000;
    SPBRG = 129;
    TXSTA   = 0b00100100;

    BAUDCON = 0b00000000;
    RCSTA   = 0b10010000;


    PIR1 = 0;
}

unsigned char getChar(void)
{
    unsigned char rxTemp = 0;

    while(PIR1bits.RCIF == 0);
    rxTemp = RCREG;
    return rxTemp;
}

 

[Pommie]

And the chip is?

Mike.

 

[AtomSoft]

Oops sorry ... Its a PIC18F4620
It triggers fine when i send a character but just not right data, im sure it has to be either osc settings or uart settings... But i cant see the problem

 

[Pommie]

It looks fine to me. Do you have a max232 fitted as that chip can work without one.

Mike.

 

[AtomSoft]

I use a usb to uart ic, either ftdi or cp2102...

 

[AtomSoft]

Hah i think its the crystal lol, i remember doing a repair on this PCB and i guess my iron was too hot... going to replace and retry

 

[AtomSoft]

YES! Works now! Thanks Pommie

 

[be80be]

Them crystals get you every time I married one she took me to the cleaners LOL

Back to this crystal osc I've cooked some myself.

 

[Mr RB]

Hi Atom, as a simple test you can send out 0x00 out the USART repeatedly with a pause between, and it will make a period of 9 LOW bauds which looks like a single LO period on the 'scope.

Assuming you have a 'scope you just probe the TX pin and can see instantly what the baudrate is as it will be the LO period divided by 9. It's a quick and reliable test that can save heaps of messing in code checking setups.

 

[AtomSoft]

Ah cool Roman, and funny Burt lol

I dont have a scope but do have a logic analyzer (saleae) which should be fine, thanks again guys!