'키트'님이 올려주신 센서 예제코드를 이용하여 avr studio4 와 hyperterminal로 출력을 해보려했는데
온도출력, 주변온도 출력 전부 0.00 만 반복되어서 어느부분이 잘못되었는지 알수있을까요? ㅠㅠ 센서는 dts l300 v2 같은것을 이용하였습니다. 
https://www.basic4mcu.com/bbs/board.php?bo_table=gesiyo13&wr_id=189&sca=%EB%B9%84%EC%A0%91%EC%B4%89%EC%98%A8%EB%8F%84%EC%84%BC%EC%84%9C 
 
#include <avr/io.h>
#include <util/delay.h>
#include <stdio.h>
#define F_CPU 16000000UL
#define U_C  unsigned char
#define U_I  unsigned int
#define U_L  unsigned long
//==============================================================================================
 
 
#define ss_delay _delay_us(15)
#define ck_delay _delay_us(5)
//==============================================================================================
void USART0_Init(long baud)
{
	unsigned int ubrr = F_CPU / 8 / baud - 1 + 0.5;
	UBRR0H = (unsigned char)(ubrr >> 8);
	UBRR0L = (unsigned char)ubrr;
	UCSR0A |= (1 << U2X);
	UCSR0C = 0b00000110;
 
	UCSR0B = 0b00011000;
}
 
 
int USART0_putchar(char c, FILE * stream)
{
	if (c == '\n') USART0_putchar('\r', stream);
	while (!(UCSR0A & (1 << UDRE)));
	UDR0 = c;
	return c;
}                                           // 예제코드
 
int USART0_getchar(FILE * stream)
{
	char c;
	while (!(UCSR0A & (1 << RXC)));
	c = UDR0;
	if (c == '\r') USART0_putchar('\n', stream);
	USART0_putchar(c, stream);
	return c;
}               // 예제코드
 
 
void SPI_WR(U_C d) {
	U_C i;
	PORTB &= 0xFE; ss_delay;
	for (i = 0; i < 8; i++) {
		if (d & (0x80 >> i)) PORTB |= 0x01; else PORTB &= 0xFB;
 
		PORTB &= 0xFD; ck_delay; PORTB |= 0x02; ck_delay;
	}
	PORTB |= 0x01;
	_delay_ms(10);
}
int SPI_RD(void) {
	U_C i;
	int tp = 0;
	PORTB &= 0xFE; ss_delay;
	for (i = 0; i < 8; i++) {
		PORTB &= 0xFD; ck_delay;
		if (PINA & 0x03)tp |= 0x80 >> i;
		PORTB |= 0x02; ck_delay;
	}
	PORTB |= 0x01;
	_delay_ms(10);
	return tp;
}
 
int main(void) {
 
	int Target, Ambient;
	float f_t, f_a;
	PORTB = 3; DDRB = 7; // SS & SCK 초기값 high
 
 
	FILE usart0 = FDEV_SETUP_STREAM(USART0_putchar, USART0_getchar, _FDEV_SETUP_RW);
	stdin = stdout = &usart0;
	USART0_Init(19200); //19200일때(default)
 
	while (1) {
 
		SPI_WR(0xA0);
		Target = SPI_RD();  //low
		Target |= SPI_RD() << 8;  //high
		f_t = (float)Target;
		f_t /= 100.0;
		_delay_ms(50);
		//
		SPI_WR(0xA1);
		Ambient = SPI_RD();  //low
		Ambient |= SPI_RD() << 8;  //high
		f_a = (float)Ambient;
		f_a /= 100.0;
		_delay_ms(500);
 
 
 
		printf("Target= %7.2f,Ambient=%7.2f\n", f_t, f_a);
 
 
	}
}