“Hello World!” with ATxmega256A3

[Gabriella]

Hi all,

I am using two radio extender boards from a REB233SMAD-EK kit and an AVRISP mkII programmer in Atmel Studio 6.2. Though the two boards seem to be recognizing each other (LED diodes blink to show successful wireless communication), I cannot find a way in which to get them to send/receive a simple message (such as "Hello World!"). I've been told that the AVRISP mkII is simply a programmer, meaning it doesn't debug. Because of this, whenever I try to debug the following code, Atmel Studio consistently displays an error message stating "Failed to launch program. Error: Failed to start programming session before chip erase with eeprom preserve:Failed to enter programming mode. Error status received from tool: Result received is 0x03.":

/*
* Hello_World.c
*
* Created: 8/21/2015 2:23:17 PM
*  Author: Hugo
*/


#include <stdio.h>
#include <avr/io.h>

static int uart_putchar(char c, FILE *stream);
static void uart_init (void);

static FILE mystdout = FDEV_SETUP_STREAM (uart_putchar, NULL, _FDEV_SETUP_WRITE);


int main (void)
{
    uart_init();
    stdout = &mystdout;
  
    while (1)
    printf("Hello, world!n");
}


static int uart_putchar (char c, FILE *stream)
{
    if (c == 'n')
    uart_putchar('r', stream);
  
    // Wait for the transmit buffer to be empty
    while ( !( USARTC0.STATUS & USART_DREIF_bm) );
  
    // Put our character into the transmit buffer
    USARTC0.DATA = c;
  
    return 0;
}


// Init USART.  Transmit only (we're not receiving anything)
// We use USARTC0, transmit pin on PC3.
// Want 9600 baud. Have a 2 MHz clock. BSCALE = 0
// BSEL = ( 2000000 / (2^0 * 16*9600)) -1 = 12
// Fbaud = 2000000 / (2^0 * 16 * (12+1))  = 9615 bits/sec
static void uart_init (void)
{
    // Set the TxD pin high – set PORTC DIR register bit 3 to 1
    PORTC.OUTSET = PIN3_bm;
  
    // Set the TxD pin as an output – set PORTC OUT register bit 3 to 1
    PORTC.DIRSET = PIN3_bm;
  
    // Set baud rate & frame format
    USARTC0.BAUDCTRLB = 0;            // BSCALE = 0 as well
    USARTC0.BAUDCTRLA = 12;
  
    // Set mode of operation
    USARTC0.CTRLA = 0;                // no interrupts please
    USARTC0.CTRLC = 0x03;            // async, no parity, 8 bit data, 1 stop bit
  
    // Enable transmitter only
    USARTC0.CTRLB = USART_TXEN_bm;
}

 

I am unsure of how to get the "Hello World!" message communicated between my two boards using the AVRISP mkII. Would I need a debugger? Is there a way I can program without it?

Any help would be very appreciated!!

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