orangePiZero2 基于wiringPi库开发串口_orangepi wiring串口速率

1.串口设备驱动

/dev/ttyS5
gnd 接gnd rx接tx5 tx接rx5 设置波特率为115200这样pc机就可以与orangepi通信了

2.串口API

int serialOpen (char *device, int baud);//打开串口 成功返回文件描述符 失败返回-1 device：设备驱动  baud：波特率
void serialPutchar(int fd,char c);///发送  fd是文件描述符
void serialGetchar(int fd,char c);.//接受
void serialClose(int fd);//关闭串口
int  serialDataAvail (int fd)//获取字符串可用的字节数

1
2
3
4
5
6

3.代码编写

serialTest.c

     
/*
 * serialTest.c:
 *      Very simple program to test the serial port. Expects
 *      the port to be looped back to itself
 *
 * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
 ***********************************************************************
 * This file is part of wiringPi:
 *      https://projects.drogon.net/raspberry-pi/wiringpi/
 *
 *    wiringPi is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU Lesser General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    wiringPi is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Lesser General Public License for more details.
 *
 *    You should have received a copy of the GNU Lesser General Public License
 *    along with wiringPi.  If not, see <http://www.gnu.org/licenses/>.
 ***********************************************************************
 */

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <pthread.h>
#include <string.h>
#include <stdlib.h>
#include <wiringPi.h>
#include <wiringSerial.h>

int fd;
void *Sendhandler(){
        char *sendBuf=NULL;
        sendBuf=(char *)malloc(32);
        while(1){
                memset(sendBuf,'\0',32);
                scanf("%s",sendBuf);
                while(*sendBuf){//sendBuf!='\0'
                        serialPutchar(fd,*sendBuf++);//发送
                }
        }

}
int main ()
{

        pthread_t send;

        if((fd=serialOpen("/dev/ttyS5",115200))==-1)//打开串口
        {
                fprintf (stderr, "Unable to open serial device: %s\n", strerror (errno)) ;
                return 1 ;
        }

        if (wiringPiSetup () == -1)
        {
                fprintf (stdout, "Unable to start wiringPi: %s\n", strerror (errno)) ;
                return 1 ;
        }


        pthread_create(&send,NULL,Sendhandler,NULL);
        while(1){
                while (serialDataAvail (fd))//可接收的字节数

                        printf ("%c", serialGetchar (fd)) ;//接收
                        fflush (stdout) ;

                }
        }
        printf ("\n") ;
        return 0 ;
}


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80

4.编译

gcc serialTest.c -lwiringPi -lwiringPiDev -lpthread -lm -lcrypt -lrt -lpthread

1
2

5.运行及效果

sudo ./a.out
1