ATmega328P + XBee-zb sends ZigBee message to coordinator (simple test).

main.c

#define F_CPU 8000000UL

#include <avr/io.h>
#include <util/delay.h>

#include <stdint.h>

#define _BAUD 9600
#define RX_BUFF			10

void initUART() {

  DDRD |= _BV(PD1);
  DDRD &= ~_BV(PD0);

  uint16_t  rate = (F_CPU / _BAUD / 16) - 1;
  UBRR0H = (rate >> 8) & 0xF00;
  UBRR0L = (uint8_t) ((rate) & 0xFF);;

  UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);

  UCSR0B = _BV(RXEN0) | _BV(TXEN0);

}

/*! \brief Returns a byte from the serial buffer
* 	Use this function if the RX interrupt is not enabled.
* 	Returns 0 on empty buffer
*/
uint8_t getByte(void)
{
  // Check to see if something was received
  while (!(UCSR0A & _BV(RXC0))) {

  }
  return (uint8_t) UDR0;
}


/*! \brief Transmits a byte
* 	Use this function if the TX interrupt is not enabled.
* 	Blocks the serial port while TX completes
*/
void putByte(unsigned char data)
{
  // Stay here until data buffer is empty
  while (!(UCSR0A & _BV(UDRE0))) {

  }
  UDR0 = (unsigned char) data;

}

/*! \brief Writes an ASCII string to the TX buffer */
void writeData(char *str, int size)
{
  for (int i = 0; i<size; i++){
    putByte(*str);
    ++str;
  }
}

const char* readData(void)
{
  static char rxstr[RX_BUFF];
  static char* temp;
  temp = rxstr;

  while((*temp = getByte()) != '\n') {
    ++temp;
  }

  return rxstr;
}

int main (void)
{
  DDRB |= _BV(DDB0);

  char xs[] = {
    0x7E,
    0x00, 0x14,
    0x10,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00,
    0x00,
    0x00,
    0x00,
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
    0xE0
  };

  initUART();

  while(1)  {
    PORTB ^= _BV(PB0);
    writeData(xs, sizeof(xs));
    _delay_ms(1000);
  }
}

Makefile

# Name: Makefile
# Author: <insert your name here>
# Copyright: <insert your copyright message here>
# License: <insert your license reference here>

# This is a prototype Makefile. Modify it according to your needs.
# You should at least check the settings for
# DEVICE ....... The AVR device you compile for
# CLOCK ........ Target AVR clock rate in Hertz
# OBJECTS ...... The object files created from your source files. This list is
#                usually the same as the list of source files with suffix ".o".
# PROGRAMMER ... Options to avrdude which define the hardware you use for
#                uploading to the AVR and the interface where this hardware
#                is connected. We recommend that you leave it undefined and
#                add settings like this to your ~/.avrduderc file:
#                   default_programmer = "stk500v2"
#                   default_serial = "avrdoper"
# FUSES ........ Parameters for avrdude to flash the fuses appropriately.

DEVICE     = atmega328p
CLOCK      = 8000000
PROGRAMMER = -c avrispmkII -P usb #-c stk500v2 -P avrdoper
OBJECTS    = main.o
FUSES      = -U lfuse:w:0xe2:m -U hfuse:w:0xd9:m # -U efuse:w:0xff:m

# http://eleccelerator.com/fusecalc/fusecalc.php?chip=atmega328p

# ATMega8 fuse bits used above (fuse bits for other devices are different!):
# Example for 8 MHz internal oscillator
# Fuse high byte:
# 0xd9 = 1 1 0 1   1 0 0 1 <-- BOOTRST (boot reset vector at 0x0000)
#        ^ ^ ^ ^   ^ ^ ^------ BOOTSZ0
#        | | | |   | +-------- BOOTSZ1
#        | | | |   +---------- EESAVE (set to 0 to preserve EEPROM over chip erase)
#        | | | +-------------- CKOPT (clock option, depends on oscillator type)
#        | | +---------------- SPIEN (if set to 1, serial programming is disabled)
#        | +------------------ WDTON (if set to 0, watchdog is always on)
#        +-------------------- RSTDISBL (if set to 0, RESET pin is disabled)
# Fuse low byte:
# 0x24 = 0 0 1 0   0 1 0 0
#        ^ ^ \ /   \--+--/
#        | |  |       +------- CKSEL 3..0 (8M internal RC)
#        | |  +--------------- SUT 1..0 (slowly rising power)
#        | +------------------ BODEN (if 0, brown-out detector is enabled)
#        +-------------------- BODLEVEL (if 0: 4V, if 1: 2.7V)
#
# For computing fuse byte values for other devices and options see
# the fuse bit calculator at http://www.engbedded.com/fusecalc/


# Tune the lines below only if you know what you are doing:

AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE)
COMPILE = avr-gcc -Wall -Os -DF_CPU=$(CLOCK) -mmcu=$(DEVICE) -std=c99

# symbolic targets:
all:	main.hex

.c.o:
	$(COMPILE) -c $< -o $@

.S.o:
	$(COMPILE) -x assembler-with-cpp -c $< -o $@
# "-x assembler-with-cpp" should not be necessary since this is the default
# file type for the .S (with capital S) extension. However, upper case
# characters are not always preserved on Windows. To ensure WinAVR
# compatibility define the file type manually.

.c.s:
	$(COMPILE) -S $< -o $@

flash:	all
	$(AVRDUDE) -U flash:w:main.hex:i

fuse:
	$(AVRDUDE) $(FUSES)

# Xcode uses the Makefile targets "", "clean" and "install"
install: flash fuse

# if you use a bootloader, change the command below appropriately:
load: all
	bootloadHID main.hex

clean:
	rm -f main.hex main.elf $(OBJECTS)

# file targets:
main.elf: $(OBJECTS)
	$(COMPILE) -o main.elf $(OBJECTS)

main.hex: main.elf
	rm -f main.hex
	avr-objcopy -j .text -j .data -O ihex main.elf main.hex
	avr-size --format=avr --mcu=$(DEVICE) main.elf
# If you have an EEPROM section, you must also create a hex file for the
# EEPROM and add it to the "flash" target.

# Targets for code debugging and analysis:
disasm:	main.elf
	avr-objdump -d main.elf

cpp:
	$(COMPILE) -E main.c