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<p>실수를 시리얼 포트를 통해 출력하려면 프로젝트를 생성하고 다음 두 가지를 변경해주어야 합니다.&nbsp;</p>



<p>제가 사용한 버전은 Atmel Studio 7.0이지만 다른 버전에서도 비슷한 방법으로 변경하면 가능합니다.</p>



<p>메뉴에서 프로젝트 – 속성을 선택한 후.</p>



<figure><img data-lazy-fallback="1" data-attachment-id="6260" data-permalink="https://webnautes.blog/6258/image-9-3/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?fit=908%2C382&amp;ssl=1" data-orig-size="908,382" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="image-9" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?fit=300%2C126&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?fit=908%2C382&amp;ssl=1" decoding="async" fetchpriority="high" width="908" height="382" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?resize=908%2C382&amp;ssl=1" alt="" sizes="(max-width: 908px) 100vw, 908px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?resize=908%2C382&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?w=908&amp;ssl=1 908w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?resize=300%2C126&amp;ssl=1 300w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-9.png?resize=768%2C323&amp;ssl=1 768w"></figure>







<p>Toolchain에 아래 항목에&nbsp;libprintf_flt를 추가해줍니다.</p>



<figure><img data-lazy-fallback="1" data-attachment-id="6262" data-permalink="https://webnautes.blog/6258/image-10-3/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?fit=1434%2C1000&amp;ssl=1" data-orig-size="1434,1000" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="image-10" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?fit=300%2C209&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?fit=1024%2C714&amp;ssl=1" decoding="async" width="1024" height="714" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?resize=1024%2C714&amp;ssl=1" alt="" sizes="(max-width: 1024px) 100vw, 1024px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?resize=1024%2C714&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?resize=1024%2C714&amp;ssl=1 1024w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?resize=300%2C209&amp;ssl=1 300w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?resize=768%2C536&amp;ssl=1 768w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?resize=1200%2C837&amp;ssl=1 1200w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-10.png?w=1434&amp;ssl=1 1434w"></figure>







<p>그리고 General에서 다음 부분을 체크해줍니다.</p>



<figure><img data-lazy-fallback="1" data-attachment-id="6264" data-permalink="https://webnautes.blog/6258/image-11-3/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?fit=1426%2C1046&amp;ssl=1" data-orig-size="1426,1046" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="image-11" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?fit=300%2C220&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?fit=1024%2C751&amp;ssl=1" decoding="async" width="1024" height="751" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?resize=1024%2C751&amp;ssl=1" alt="" sizes="(max-width: 1024px) 100vw, 1024px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?resize=1024%2C751&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?resize=1024%2C751&amp;ssl=1 1024w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?resize=300%2C220&amp;ssl=1 300w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?resize=768%2C563&amp;ssl=1 768w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?resize=1200%2C880&amp;ssl=1 1200w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-11.png?w=1426&amp;ssl=1 1426w"></figure>







<pre><code>/* 
 * atmega128-adc-example.c 
 * 
 * Created: 2015-12-15 오후 1:37:05 
 * Author : webnautes 
 */   
  
#define F_CPU 16000000UL  
  
//1. baud rate를 선택  
#define USART_BAUDRATE 9600  
  
//2.시스템 클록과 원하는 baud rate를 이용하여 UBRR 값을 계산한다.  
#define UBRR_VALUE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)  
  
#include &lt;avr/io.h&gt;  
#include &lt;util/delay.h&gt;  
#include &lt;stdio.h&gt;  
  
  
void usartInit()  
{  
    //3. UBRR0은 16비트 레지스터이기 때문에 8비트씩 나누어서 넣어야 한다.  
    UBRR0H = (uint8_t)(UBRR_VALUE&gt;&gt;8);  
    UBRR0L = (uint8_t) UBRR_VALUE;  
      
    //4. USART 설정  
    UCSR0C |= (1&lt;&lt;UCSZ00)|(1&lt;&lt;UCSZ01); //Charecter size : 8비트  
    UCSR0C &amp;= ~(1&lt;&lt;USBS0); //stop  bit : 1비트  
    UCSR0C &amp;= ~((1&lt;&lt;UPM01)|(1&lt;&lt;UPM00)); // no parity mode  
      
    //5. 송수신을 가능하게 한다.  
    UCSR0B=(1&lt;&lt;RXEN0)|(1&lt;&lt;TXEN0);  
}  
  
  
void uart_putchar(uint8_t u8Data, FILE *stream )  
{  
    //이전 전송이 끝나기를 기다림  
    while(!(UCSR0A&amp;(1&lt;&lt;UDRE0))){};  
      
    UDR0 = u8Data;  
}  
  
uint8_t uart_getchar( FILE *stream)  
{  
    // 수신 되기를 기다림  
    while(!(UCSR0A&amp;(1&lt;&lt;RXC0))){};  
      
    return UDR0;  
}  
  
//http://www.appelsiini.net/2011/simple-usart-with-avr-libc  
FILE uart_output = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);  
FILE uart_input = FDEV_SETUP_STREAM(NULL, uart_getchar, _FDEV_SETUP_READ);  
  
  
  
  
int main(void)  
{  
    //ADC init  
    ADMUX |= (0&lt;&lt;REFS1 | 1&lt;&lt;REFS0); //기준전압으로 AVCC 사용  
      
    //ADC 입력채널 선택  ADC0(PF0)  
    ADMUX &amp;= ~( (1&lt;&lt;MUX4) | (1&lt;&lt;MUX3) | (1&lt;&lt;MUX2) | (1&lt;&lt;MUX1) | (1&lt;&lt;MUX0) );    
          
          
    ADCSRA |= (1&lt;&lt;ADEN); //ADC 기능 활성화  
      
    // 16Mhz/128 = 125Khz, ADC의 입력 클록 주파수   
    ADCSRA |= ((1&lt;&lt;ADPS2)|(1&lt;&lt;ADPS1)|(1&lt;&lt;ADPS0));     
      
          
          
    usartInit();  
    stdout = &amp;uart_output;  
    stdin  = &amp;uart_input;  
  
    while (1)   
    {         
        ADCSRA |= (1&lt;&lt;ADSC); //ADC 변환 시작  
          
        //ADC 변환이 완료되면 자동으로 ADSC는 0이 되기 때문에 이렇게 대기한다.  
        while(ADCSRA &amp; (1&lt;&lt;ADSC));   
              
        unsigned char low  = ADCL;  
        unsigned char high = ADCH;  
        int temperature = (high &lt;&lt; 8) | low;    
          
        float result = temperature * 5.0/1024*100;  
          
        char str[256];  
        sprintf( str, "temperature %4.2f\r\n", result );  
        printf( str );  
        _delay_ms(100);       
          
    }  
}  </code></pre>







<p>실행결과가 너무 빨리나와서 &nbsp;100ms 정도 딜레이를 주고 출력해봤습니다.</p>



<figure><img data-lazy-fallback="1" data-attachment-id="6266" data-permalink="https://webnautes.blog/6258/image-12-3/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?fit=1074%2C892&amp;ssl=1" data-orig-size="1074,892" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="image-12" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?fit=300%2C249&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?fit=1024%2C850&amp;ssl=1" decoding="async" loading="lazy" width="1024" height="850" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?resize=1024%2C850&amp;ssl=1" alt="" sizes="(max-width: 1024px) 100vw, 1024px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?resize=1024%2C850&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?resize=1024%2C850&amp;ssl=1 1024w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?resize=300%2C249&amp;ssl=1 300w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?resize=768%2C638&amp;ssl=1 768w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-12.png?w=1074&amp;ssl=1 1074w"></figure>







<p>참고로 LM35의 핀아웃은 아래와 같습니다. &nbsp;Vout을 PF0에 연결해서 센서값을 얻어왔습니다.</p>



<figure><img data-lazy-fallback="1" data-attachment-id="6267" data-permalink="https://webnautes.blog/6258/image-13-3/" data-orig-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-13.png?fit=306%2C414&amp;ssl=1" data-orig-size="306,414" data-comments-opened="1" data-image-meta="{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}" data-image-title="image-13" data-image-description="" data-image-caption="" data-medium-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-13.png?fit=222%2C300&amp;ssl=1" data-large-file="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-13.png?fit=306%2C414&amp;ssl=1" decoding="async" loading="lazy" width="306" height="414" src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-13.png?resize=306%2C414&amp;ssl=1" alt="" sizes="(max-width: 306px) 100vw, 306px" data-recalc-dims="1" data-old-src="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-13.png?resize=306%2C414&amp;is-pending-load=1#038;ssl=1" data-lazy-srcset="https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-13.png?w=306&amp;ssl=1 306w, https://i0.wp.com/webnautes.blog/wp-content/uploads/2023/09/image-13.png?resize=222%2C300&amp;ssl=1 222w"></figure>







<p>2015. 12. 17 최초작성</p>





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멈춤보단 천천히라도

webnautes

실수를 시리얼 포트를 통해 출력하려면 프로젝트를 생성하고 다음 두 가지를 변경해주어야 합니다.  제가 사용한 버전은 Atmel Studio 7.0이지만 다른 버전에서도 비슷한 방법으로 변경하면 가능합니다. 메뉴에서 프로젝트 – 속성을 선택한 후. Toolchain에 아래 항목에 libprintf_flt를 추가해줍니다. 그리고 General에서 다음 부분을 체크해줍니다. 실행결과가 너무 빨리나와서  100ms 정도 딜레이를 주고 출력해봤습니다. 참고로 LM35의 핀아웃은 아래와 같습니다.  Vout을 PF0에 연결해서… 더 보기 »Atmega128 ADC예제 – lm35 온도 센서값 시리얼로 출력하기
The post Atmega128 ADC예제 – lm35 온도 센서값 시리얼로 출력하기 first appeared on 멈춤보단 천천히라도.

Atmega128 ADC예제 – lm35 온도 센서값 시리얼로 출력하기

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