Question

我正在为MCU编写代码，直到通过UART（RS232）传输数据。 [ATmega8A]

目前，我正在使用Proteus测试我的代码：

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdlib.h>
#include <compat/twi.h>

#define FOSC 16000000                                       //Clock Speed
#define BAUD 9600                                           //Baud rate set to 9600
#define MYBRR FOSC/16/BAUD-1

void USART_Init (void)
{
UBRRH = (MYBRR >> 8);                                //Code for setting
UBRRL = MYBRR;                                       //the baud rate
UCSRB = (1 << RXEN) | (1 << TXEN);                   //Enable receiver and transmitter
UCSRC = (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1);  //Frame format setting: 8 Data, 2 Stop bit
}

/* USART transmit function */
void USART_Transmit(unsigned char data)
{
     while(!(UCSRA & (1 << UDRE)));                     //Wait until transmit buffer is empty

     UDR = data;
}

/* USART receive function */
unsigned char USART_Receive(void)
{
     while(!(UCSRA & (1 << RXC)));                      //Wait until data is received

     return UDR;                            //Get the data from buffer and return it
}

和主要的测试代码：

 int main(void)
 {
 unsigned char c;

while(1)
{
    a = USART_Receive();
    c = 10;
    USART_Transmit(c);
    _delay(10000);
}
}

在Proteus中，虚拟终端显示0.但是，我希望看到10。这只是一个示例，通常只有最后一个数字/字符在虚拟终端上显示。我无法解释这一点。 Proteus bug还是逻辑错误？

感谢您的任何建议。

Answer 1

UART数据仅以ascii格式发送...您必须将整数数据转换为ascii格式..使用itoa（）或执行此操作

int main(void)
 {
 unsigned char c;
 unsigned char b;

while(1)
{
    a = USART_Receive();
    c = 10;
    b=c;
    b=c/10;
    USART_Transmit(b+48);
    b=0;
    b=c%10;
    USART_Transmit(b+48);
    _delay(10000);
}
}

AVR，UART，Proteus仿真，并非虚拟终端上显示的所有数据

1 个答案: