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September 29, 2016 21:54
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/* hacked together from | |
https://github.com/xanthium-enterprises/Serial-Port-Programming-on-Linux/blob/master/USB2SERIAL_Read/Reciever%20(PC%20Side)/SerialPort_read.c | |
https://forum.arduino.cc/index.php?topic=288234.0 | |
*/ | |
/*====================================================================================================*/ | |
/* 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 */ | |
typedef enum { false, true } bool; | |
void main(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[1024]; /* Buffer to store the data received */ | |
int bytes_read = 0; /* Number of bytes read by the read() system call */ | |
int i = 0; | |
char c; | |
int numChars = 32; | |
char receivedChars[numChars]; | |
int ndx = 0; | |
char endMarker = '\n'; | |
char rc; | |
bool newData = false; | |
while (1) { | |
while (read(fd, &c, 1) > 0 && newData == false) { | |
rc = c; | |
if (rc != endMarker) { | |
receivedChars[ndx] = rc; | |
ndx++; | |
if (ndx >= numChars) { | |
ndx = numChars - 1; | |
} | |
} | |
else { | |
receivedChars[ndx] = '\0'; // terminate the string | |
newData = true; | |
} | |
} | |
if (newData == true) { | |
//printf("This just in ...\n "); | |
for (i=0;i<ndx;i++) { | |
printf("%c",receivedChars[i]); | |
} | |
printf("\n"); | |
ndx=0; | |
newData = false; | |
} | |
} | |
} |
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