Question

我正在尝试使用USART通信接收和发送数据，我使用atmega16。我在PC中创建程序将字符串发送到micro，如果字符串匹配，micro将激活adc并将adc数据发送到PC。

这是我的微控制器中的代码

#include <mega16.h>
#include <delay.h>
#include <stdio.h>
#include <string.h>

#define ADC_VREF_TYPE 0xC0

unsigned int read_adc(unsigned char pin_adc)
{
ADMUX=pin_adc | ADC_VREF_TYPE;
// Delay needed for the stabilization of the ADC input voltage
delay_us(10);
// Start the AD conversion
ADCSRA|=0x40;
// Wait for the AD conversion to complete
while ((ADCSRA & 0x10)==0);
ADCSRA|=0x10;
return ADCW;
}

//unsigned char DataInput = 0x00;
unsigned long int osilator = 12000000;
unsigned long int UBRR;
unsigned int t0, t1, t2, t3;
float t00, t11, t22, t33;

void inisialisasiUART(unsigned long int baud_rate);
//unsigned char getData(void);

unsigned char compare[30] = "a";
unsigned char input[30];
unsigned char buf[30];
void main(void)
{
    ADMUX = ADC_VREF_TYPE;
    ADCSRA = 0x85;
    inisialisasiUART(9600);
    while(1)
    {               
        //DataInput = getData();  

        scanf("%s", input);  
        if(strcmp(input, compare) == 0)
        {   
            t0 = read_adc(0);  
            t00 = (float)t0*256/1024; 

            t1 = read_adc(1);         
            t11 = (float)t0*256/1024;  

            t2 = read_adc(2);          
            t22 = (float)t0*256/1024;  

            t3 = read_adc(3);      
            t33 = (float)t0*256/1024;  

            sprintf(buf, "a%.2f %.2f %.2f %.2fa", t00, t11, t22, t33);   
            printf("%s", buf);
        }   
    }
}

void inisialisasiUART(unsigned long int baud_rate)
{
    UBRR  = (osilator/(16*baud_rate))-1;
    UBRRL = UBRR;
    UBRRH = UBRR>>8;
    UCSRB = 0x18;
    UCSRC = 0x86;
}

unsigned char getData(void)
{
while(!(UCSRA & 0x80));
return UDR;
}

从我的代码中，错误在哪里？我可以使用scanf接收usart数据吗？什么是接收和发送数据的最佳方式？使用UDR或printf scanf？谢谢

Answer 1

嗯，你可以使用strncmp（），但我个人使用的是strstr（），当我需要解析＆＃34;解析＆＃34;响应。

Answer 2

enter code here
include<stdlib.h>  
char str2[40];
float dist_klimeter;
dist_klimeter=cust5_distance/1000.00;
ftoa(dist_klimeter, 2, str2);
sprintf(string, "  d:%sKm" ,  str2);

CodeVision AVR发送和接收USART数据

2 个答案: