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In this article, I will show you how to do serial read/write with System.IO.Ports.SerialPort and how you can build the source code on Windows and run the binary on linux-arm (Raspbian). By the time I write this article,.NET Core and System.IO.Ports are on preview, when you read this article, do check if there are any new releases.
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Sign upI have a laptop which has only one serial port. I went into: /dev directory, and I found: ttyS0 ttyS1 ttyS2 ttyS3 How do I know which of those 'ttyS' refers to my serial port? Jan 28, 2010 Linux offers various tools. Linux uses ttySx for a serial port device name. For example, COM1 (DOS/Windows name) is ttyS0, COM2 is ttyS1 and so on. Adblock detected 😱 My website Continue reading 'How To Check and Use Serial Ports Under Linux'. It is serial port 2 (- /dev/ttymxc2) on APF51; it is debug serial port 0 (- /dev/ttyAM0 (2.6.35 kernel) or /dev/ttyAMA0 (3.x kernels)) on APF28; So, without software modifications, this port is not available to connect a MODEM or any other RS-232 device. If you want to use it as a normal serial port on Linux then: be sure that your device won.
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xanthium-enterprisesSerial Programming on Linux V1.07865c54Sep 4, 2015
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| /**/ |
| /* Serial Port Programming in C (Serial Port Read) */ |
| /* Non Cannonical mode */ |
| /*----------------------------------------------------------------------------------------------------*/ |
| /* Program reads a string from the serial port at 9600 bps 8N1 format */ |
| /* Baudrate - 9600 */ |
| /* Stop bits -1 */ |
| /* No Parity */ |
| /*----------------------------------------------------------------------------------------------------*/ |
| /* Compiler/IDE : gcc 4.6.3 */ |
| /* Library : */ |
| /* Commands : gcc -o serialport_read serialport_read.c */ |
| /* OS : Linux(x86) (Linux Mint 13 Maya)(Linux Kernel 3.x.x) */ |
| /* Programmer : Rahul.S */ |
| /* Date : 21-December-2014 */ |
| /**/ |
| /**/ |
| /* www.xanthium.in */ |
| /* Copyright (C) 2014 Rahul.S */ |
| /**/ |
| /**/ |
| /* Running the executable */ |
| /* ---------------------------------------------------------------------------------------------------*/ |
| /* 1) Compile the serialport_read.c file using gcc on the terminal (without quotes) */ |
| /**/ |
| /* ' gcc -o serialport_read serialport_read.c ' */ |
| /**/ |
| /* 2) Linux will not allow you to access the serial port from user space,you have to be root.So use */ |
| /* 'sudo' command to execute the compiled binary as super user. */ |
| /**/ |
| /* 'sudo ./serialport_read' */ |
| /**/ |
| /**/ |
| /**/ |
| /* Sellecting the Serial port Number on Linux */ |
| /* ---------------------------------------------------------------------------------------------------*/ |
| /* /dev/ttyUSBx - when using USB to Serial Converter, where x can be 0,1,2...etc */ |
| /* /dev/ttySx - for PC hardware based Serial ports, where x can be 0,1,2...etc */ |
| /**/ |
| /*-------------------------------------------------------------*/ |
| /* termios structure - /usr/include/asm-generic/termbits.h */ |
| /* use 'man termios' to get more info about termios structure */ |
| /*-------------------------------------------------------------*/ |
| #include<stdio.h> |
| #include<fcntl.h>/* File Control Definitions */ |
| #include<termios.h>/* POSIX Terminal Control Definitions */ |
| #include<unistd.h>/* UNIX Standard Definitions */ |
| #include<errno.h>/* ERROR Number Definitions */ |
| voidmain(void) |
| { |
| int fd;/*File Descriptor*/ |
| printf('n +----------------------------------+'); |
| printf('n | Serial Port Read |'); |
| printf('n +----------------------------------+'); |
| /*------------------------------- Opening the Serial Port -------------------------------*/ |
| /* Change /dev/ttyUSB0 to the one corresponding to your system */ |
| fd = open('/dev/ttyUSB0',O_RDWR | O_NOCTTY); /* ttyUSB0 is the FT232 based USB2SERIAL Converter */ |
| /* O_RDWR - Read/Write access to serial port */ |
| /* O_NOCTTY - No terminal will control the process */ |
| /* Open in blocking mode,read will wait */ |
| if(fd -1) /* Error Checking */ |
| printf('n Error! in Opening ttyUSB0 '); |
| else |
| printf('n ttyUSB0 Opened Successfully '); |
| /*---------- Setting the Attributes of the serial port using termios structure --------- */ |
| struct termios SerialPortSettings; /* Create the structure */ |
| tcgetattr(fd, &SerialPortSettings); /* Get the current attributes of the Serial port */ |
| /* Setting the Baud rate */ |
| cfsetispeed(&SerialPortSettings,B9600); /* Set Read Speed as 9600 */ |
| cfsetospeed(&SerialPortSettings,B9600); /* Set Write Speed as 9600 */ |
| /* 8N1 Mode */ |
| SerialPortSettings.c_cflag &= ~PARENB; /* Disables the Parity Enable bit(PARENB),So No Parity */ |
| SerialPortSettings.c_cflag &= ~CSTOPB; /* CSTOPB = 2 Stop bits,here it is cleared so 1 Stop bit */ |
| SerialPortSettings.c_cflag &= ~CSIZE; /* Clears the mask for setting the data size */ |
| SerialPortSettings.c_cflag |= CS8; /* Set the data bits = 8 */ |
| SerialPortSettings.c_cflag &= ~CRTSCTS; /* No Hardware flow Control */ |
| SerialPortSettings.c_cflag |= CREAD | CLOCAL; /* Enable receiver,Ignore Modem Control lines */ |
| SerialPortSettings.c_iflag &= ~(IXON | IXOFF | IXANY); /* Disable XON/XOFF flow control both i/p and o/p */ |
| SerialPortSettings.c_iflag &= ~(ICANON | ECHO | ECHOE | ISIG); /* Non Cannonical mode */ |
| SerialPortSettings.c_oflag &= ~OPOST;/*No Output Processing*/ |
| /* Setting Time outs */ |
| SerialPortSettings.c_cc[VMIN] = 10; /* Read at least 10 characters */ |
| SerialPortSettings.c_cc[VTIME] = 0; /* Wait indefinetly */ |
| if((tcsetattr(fd,TCSANOW,&SerialPortSettings)) != 0) /* Set the attributes to the termios structure*/ |
| printf('n ERROR ! in Setting attributes'); |
| else |
| printf('n BaudRate = 9600 n StopBits = 1 n Parity = none'); |
| /*------------------------------- Read data from serial port -----------------------------*/ |
| tcflush(fd, TCIFLUSH); /* Discards old data in the rx buffer */ |
| char read_buffer[32]; /* Buffer to store the data received */ |
| int bytes_read = 0; /* Number of bytes read by the read() system call */ |
| int i = 0; |
| bytes_read = read(fd,&read_buffer,32); /* Read the data */ |
| printf('nn Bytes Rxed -%d', bytes_read); /* Print the number of bytes read */ |
| printf('nn'); |
| for(i=0;i<bytes_read;i++) /*printing only the received characters*/ |
| printf('%c',read_buffer[i]); |
| printf('n +----------------------------------+nnn'); |
| close(fd); /* Close the serial port */ |
| } |
Linux Serial Port Reader
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