[avr-gcc-list] uart problem with atmega 128 -> Solution

[Jean François BOUTILLON]

Thanks to tod, I found the solution. I was using a IAtWorf from bergmann
electronic, with pony prog to program my atmega.
The problem was in the fuses the were indicating the the atmega was in 103
compatibility mode.
To change the fuses with ponyprog, just go to the menu "command/security and
configuration bits".

Thanks to tod


/*************************************************************/
Hi all.
 I have a problem with my uart on atmega 128.
 I try to make s simple program that just echoes the character it receives.
 The soure of the program is belox.
 The program works ok (the =charactes are echoed) BUT thr program restarts
 each time a character is sent (the green led blinks each time a character
is
 sent).
 Does anyone knows why the orogram restarts ?

 Thanks a lot

 Jeff

 Source of the code :
 /************************************************************/
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <avr/signal.h>


 #define ON(X) outp(1<<(X), PORTB)
 #define OFF() outp(0, PORTB)
 #define F_CPU            16000000      /* 16Mhz */
 #define UART_BAUD_RATE      9600      /* 9600 baud */

 #define PAUSE() {unsigned char i,j;for(i=0;i<255;i++)for(j=0;j<255;j++);}

 #define UART_BAUD_SELECT (F_CPU/(16*UART_BAUD_RATE)-1)

 typedef unsigned char  u08;
 typedef          char  s08;

 SIGNAL(SIG_UART0_RECV)
 {
  u08 recu=inp(UDR0);
  outp(recu,UDR0);
 }


 int main(void)
 {
  // Port B as output
  outp(0xff ,DDRB);

  // initialize UART
  outp((1<<UCSZ01)|(1<<UCSZ00),UCSR0C);
     outp((u08)UART_BAUD_SELECT, UBRR0L);
  outp((1<<RXEN0)|(1<<RXCIE)|(1<<TXEN0),UCSR0B);
  sei();

  // Make green led blink once
  ON(4);PAUSE();OFF();

  for (;;)
  {
   // make red led blink
   PAUSE();PAUSE();ON(6);PAUSE();PAUSE();OFF();
  }
 }