樹莓派_Linux串口編程_實現接收

recv.h
#ifndef _RECV_H
#define _RECV_H

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>

#define BAUDRATE B115200 ///Baud rate : 115200
#define DEVICE "/dev/ttyAMA0"
#define SIZE 1024

#endif

recv.c
#include "Recv.h"

int nFd = 0;
struct termios stNew;
struct termios stOld;

//Open Port & Set Port
int SerialInit()
{
	nFd = open(DEVICE, O_RDWR|O_NOCTTY|O_NDELAY);
	if(-1 == nFd)
	{
		perror("Open Serial Port Error!\n");
		return -1;
	}
	if( (fcntl(nFd, F_SETFL, 0)) < 0 )
	{
		perror("Fcntl F_SETFL Error!\n");
		return -1;
	}
	if(tcgetattr(nFd, &stOld) != 0)
	{
		perror("tcgetattr error!\n");
		return -1;
	}

	stNew = stOld;
	cfmakeraw(&stNew);//將終端設置爲原始模式，該模式下全部的輸入數據以字節爲單位被處理

	//set speed
	cfsetispeed(&stNew, BAUDRATE);//115200
	cfsetospeed(&stNew, BAUDRATE);

	//set databits  
	stNew.c_cflag |= (CLOCAL|CREAD);
	stNew.c_cflag &= ~CSIZE;
	stNew.c_cflag |= CS8;

	//set parity  
    stNew.c_cflag &= ~PARENB;  
    stNew.c_iflag &= ~INPCK;

	//set stopbits  
    stNew.c_cflag &= ~CSTOPB;
	stNew.c_cc[VTIME]=0;	//指定所要讀取字符的最小數量
	stNew.c_cc[VMIN]=1;	//指定讀取第一個字符的等待時間，時間的單位爲n*100ms
				//假設設置VTIME=0，則無字符輸入時read（）操作無限期的堵塞
	tcflush(nFd,TCIFLUSH);	//清空終端未完畢的輸入/輸出請求及數據。
    if( tcsetattr(nFd,TCSANOW,&stNew) != 0 )
	{
		perror("tcsetattr Error!\n");
		return -1;
	}

	return nFd;
}

int main(int argc, char **argv)
{
	int nRet = 0;
	char buf[SIZE];

	if( SerialInit() == -1 )
	{
		perror("SerialInit Error!\n");
		return -1;
	}

	bzero(buf, SIZE);
	while(1)
	{
		nRet = read(nFd, buf, SIZE);
		if(-1 == nRet)
		{
			perror("Read Data Error!\n");
			break;
		}
		if(0 < nRet)
		{
			buf[nRet] = 0;
			printf("Recv Data: %s\n", buf);
		}
	}

	close(nFd);
	return 0;
}

參考：https://www.cnblogs.com/mfrbuaa/p/3803522.html