serial output anomaly in atmega2560 - serial-port

Question

I am facing a problem with atmega2560 serial outport port. When I connect AVRISPmkII programmer to atmega2560, all serial port gives output data at specified baud rate but when I disconnect programmer, there is no output but 1 second led blinks. I don't think that this is the code proble!m. I have not tried it with other programmer as that is all I have. The code is very simple anyway - blink led at 1 second and give output through RS232 port.
Voltage at reset pin is 5V and at sck is about 1.19V whether or not programmer is connected.
What is the problem here ?
The figure shows ISP and serial port circuits.
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdio.h>
#include <string.h>
void USART0_init(void) /*************** USART 0 ***********************/
{
UCSR0A = 0x00;
UCSR0B = 0b00011000;
UCSR0C = 0b00000110;
UBRR0H = 0x00;
UBRR0L = 103; //baud rate: 9600, right - rx, tx, gnd - left
}
void USART0_putc(char data)
{
while(!(UCSR0A&0x20));
UDR0=data;
}
void USART0_puts(char* str){
while(*str) {USART0_putc(*str++);}
}
void USART1_init(void) /*************** USART 1 ***********************/
{
UCSR1A = 0x00;
UCSR1B = 0b10011000;
UCSR1C = 0b00000110;
UBRR1H = 0x00;
UBRR1L = 103; //baudrate: 9600
}
void USART1_putc(char data)
{
while(!(UCSR1A&0x20));
UDR1=data;
}
void USART1_puts(char* str){
while(*str) {USART1_putc(*str++);}
}
char t = 0;
char rx_buf1[50];
ISR(USART1_RX_vect)
{
cli();
t = UDR1;
rx_buf1[cnt1++] = t;
if (t == 0x0a){ // detect EOL \n FOR NOW
rx_buf1[cnt1] = '\0';
sprintf(out_buf1, "\r\nS1, ");
strcat(out_buf1, (const char*)rx_buf1);
sprintf(out_buf1, ", /");
USART0_puts(out_buf1);
cnt1 = 0;
rx_complete1 = 1;
}
if (cnt1 >= 50){
cnt1 = 0;
}
sei();
}
void timer_init(void)
{
cli();
TCCR1B = (1<<WGM12); //CTC mode
OCR1A = 1561; //100 ms
TIMSK1 |= (1<<OCIE1A);
TCCR1B |= (1<<CS12)|(0<<CS11)|(1<<CS10);
}
void dev_init(void)
{
DDRA = 0x0F;
PORTA = 0x00;
timer_init();
stdout = &uart0_str;
stderr = &uart1_str;
USART0_init();
USART1_init();
sei();
}
int main(void)
{
dev_init();
while(1)
{
process();
}
return 0;
}
volatile unsigned char tick_100ms;
char out_buf[100];
float speed = 4.3;
void process(void){
static unsigned char lc=1;
static uint8_t tick_cnt = 0;
if (tick_100ms){
tick_100ms = 0;
tick_cnt++;
if (tick_cnt == 10){
tick_cnt = 0;
PORTA = ~lc; /* this code is for blinking 4 LEDS */
lc = lc*2; /* very 1 seconds alternately*/
if (lc >8) lc = 1;
sprintf(out_buf, "S1, speed: %05.2f/\r\n", (double)speed);
USART0_puts(out_buf);
USART1_puts(out_buf);
}
}
}
I gave posted my code below.
The uart 1 interrupt code is not needed because there is no incoming data. Disabling them made no difference.