Pic18fj10 usart problems

[Stefanovic]

Hello everybody,

I'm facing some stranges troubles with my simple UART c code.
My problem is that the first while of bonjour(); never ends, thus i cant send even the first byte. (
Here is the code,(no reception, just transmission) i really need help
thanks a lot !!

#include <htc.h>
#include <pic18f87j10.h>
#include <stdio.h>
#include <stdlib.h>

//----PIC Configuration bits-----
#pragma config	DEBUG = OFF		// debugger off
#pragma config	XINST = OFF		// extended instruction set disabled
#pragma config	STVREN = OFF            // stack overflow interrupt disabled
#pragma config	WDTEN = OFF		// WDT disabled
#pragma	config	CP0 = OFF		// code protection disabled
#pragma	config	FCMEN = OFF		// fail safe clock monitor disabled
#pragma config	IESO = OFF		// internal/external clock switch disabled
#pragma config	FOSC = HSPLL		// HS oscillator (PLL enabled, software control)
#pragma config	MODE = MM		// Microcontroller mode
#pragma config	ECCPMX = DEFAULT        // Default setting for ECCP1
#pragma	config	CCP2MX = DEFAULT	// Default setting for ECCP2
#pragma	config	FOSC2 = ON		// Clock selected by OSCCON bits



void init_uart (void) {

    OSCTUNE=0x40; //PLL x 4 with primary crystal at 10Mhz ==> 40Mhz with PLL

//----config port I/O-----
    PORTB=0x00;
    LATD=0x00;
    TRISB=0x01;       //RB0 out

    PORTD=0x00;
    LATD=0x00;
    TRISD=0x00;

    PORTC=0x00;
    LATC=0x00;
    TRISC=0x90;   //RC7(RX) in, RC6(TX) out,  ...

    TXREG1=0x00;
    RCREG1=0x00;

//----config regsitres uart----
    TXSTA1=0x24;        //TXEN=1, BRGH=1 high speed
    BAUDCON1=0x08;      //BRG16=1  (using two register to calculate Baud Rate)
    SPBRGH1=0x00;
    SPBRG1=0xAC;        //
    RCSTA1=0x90;        // SPEN=1,  CREN=1     serial port enabled,
}


void bonjour (void){

    TXREG1='b';
    while(TX1IF!=1){}
    TXREG1='o';
    while(TX1IF!=1){}
    TXREG1='n';
    while(TX1IF!=1){}
    TXREG1='j';
    while(TX1IF!=1){}
    TXREG1='o';
    while(TX1IF!=1){}
    TXREG1='u';
    while(TX1IF!=1){}
    TXREG1='r';
    while(TX1IF!=1){}
    TXREG1=0x0A;  //line feed ascii
}


void main (void) {

    init_uart();
    while(1){
        bonjour();
    }
}

 

[sky_123]

I don't know PIC, but isn't TX1IF an interrupt flag or something? Not sure if that's a good way to know if the byte has been transmitted.
I could be wrong...

 

[Stefanovic]

Thank you for your answer, in fact yes TX1IF is an interrupt flag,
i tried some other flags, but still not working,
any suggestion ? thanks

 

[Stefanovic]

Hello, In fact for those who still have thoses problems, try to check USART integity,
yes, for me it burnt )
so i tried the same code with USART 2 and it works
best regards

 

[td micro]

USART integity means???
actually i could transmit by using printf. but i clouldnt read from keyboard..

 

[Stefanovic]

Sorry, i meant integrity, my first USART (EUSART1) had burnt

USART integity means???
actually i could transmit by using printf. but i clouldnt read from keyboard..

why can't you read from keyboard ?