#include <stdio.h>#include <string.h>#include <unistd.h>#include <fcntl.h> /* File control definitions */#include <errno.h>#include <termios.h> /* POSIX terminal control definitions *//* * 'open_port()' - Open serial port 1 * Returns the file descriptor on success or -1 on err...
使用Linux下的/dev/ttyUSB0设备文件通过AT指令来配置EC20模块,采用C语言和Python这两种编程语言实现这一过程。 EC20 是Quectel 生产的 4G LTE 模块。是一个多功能的通信模块,广泛应用于各种 IoT(物联网)设备中,提供了可靠的无线通信能力。EC20 支持 LTE FDD、LTE TDD、WCDMA 和 GSM 网络,能够实现高速的数据...
接下来,我们可以通过串口输出信息。在minicom中,我们可以通过按下“Ctrl+A”然后按下“p”选择“Send file”,然后选择一个文本文件发送到串口。我们还可以通过使用echo命令来在命令行中输出信息到串口,例如: echo "Hello, world!" > /dev/ttyS0 通过上述步骤,我们可以在Linux系统中使用串口输出信息。串口通信可以...
/* send an AT command followed by a CR */ if (write(fd, "AT\r", 3) < 3) continue; /* read characters into our string buffer until we get a CR or NL */ bufptr = buffer; while ((nbytes = read(fd, bufptr, buffer + sizeof(buffer) - bufptr - 1)) > 0) { bufptr +=...
/* send an AT command followed by a CR */ if (write(fd, "AT\r", 3) < 3) continue; /* read characters into our string buffer until we get a CR or NL */ bufptr = buffer; while ((nbytes = read(fd, bufptr, buffer + sizeof(buffer) - bufptr - 1)) > 0) ...
/* send an AT command followed by a CR */ if (write(fd, "AT\r", 3) < 3) continue; /* read characters into our string buffer until we get a CR or NL */ bufptr = buffer; while ((nbytes = read(fd, bufptr, buffer + sizeof(buffer) - bufptr - 1)) > 0) ...
……int len;//待发送数据char sbuf[]={Hello,this is a Serial_Port test!/n };int send_len=sizeof(sbuf); //发送缓冲区字节数定义len= write(fd,sbuf,send_len); //if(n == -1) printf("Wirte sbuf error./n"); …… 1. 四、 关闭串口 ...
[rumenz@local ~]$ netstat -at Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 localhost:mysql *:* LISTEN tcp 0 0 *:5901 *:* LISTEN tcp 0 0 *:5902 *:* LISTEN tcp 0 0 *:x11-1 *:* LISTEN tcp 0 0 *:x11-2...
at com.fazecast.jSerialComm.SerialPort.(SerialPort.java:367) Please suggest next step. Actual Issue with 2.6.2. Version - The major issue while we transmit/Send data over Serial / USB(In between 64 kb to 512KB) with Linux OS then after some transmission and while reading from Serial /...
transfer_buffer) return -ENOMEM; /* send a get connection info request */ retval = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), VISOR_GET_CONNECTION_INFORMATION, 0xc2, 0x0000, 0x0000, transfer_buffer, sizeof(*connection_info), 300); if (retval < 0) { dev_err(...