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getting serial code from an old project

This commit is contained in:
tTh 2018-12-12 14:38:32 +01:00
parent 6bdfad1650
commit 4914e5113f
3 changed files with 112 additions and 2 deletions
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10
serial/README.md
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# Serial Input
But premier de ce module : recevoir les données fournies par l'automate
de contrôle du phytotron.
de contrôle du phytotron. Ayant déja pratiqué ce genre de chose pour un
déja ancien
[dfhdfgh](http://art.dinorama.fr/bdf/)
avec _MadPhoenix_, je me propose de reprendre quelques parties de ce code.

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serial/serial.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h> //Used for UART
#include <fcntl.h> //Used for UART
#include <termios.h> //Used for UART
#include "serial.h"
/* -------------------------------------------------------------------- */
int baudrate2const(int bauds)
{
int br;
switch (bauds)
{
case 1200: br = B1200; break;
case 2400: br = B2400; break;
case 4800: br = B4800; break;
case 9600: br = B9600; break;
case 19200: br = B19200; break;
case 38400: br = B38400; break;
case 57600: br = B57600; break;
case 115200: br = B115200; break;
default:
fprintf(stderr, "baudrate %d invalide\n", bauds);
exit(1);
break;
}
return br;
}
/* -------------------------------------------------------------------- */
int prepare_UART(char *port, int baudrate)
{
int uart0 = -1;
int baudbits;
struct termios options;
#if DEBUG_LEVEL
fprintf(stderr, "%s ( %s %d )\n", __func__, port, baudrate);
#endif
//OPEN THE UART
//The flags (defined in fcntl.h):
// Access modes (use 1 of these):
// O_RDONLY - Open for reading only.
// O_RDWR - Open for reading and writing.
// O_WRONLY - Open for writing only.
//
// O_NDELAY / O_NONBLOCK (same function) - Enables nonblocking mode.
// When set read requests on the file can return immediately with a
// failure status
// if there is no input immediately available (instead of blocking).
// Likewise, write requests can also return
// immediately with a failure status if the output can't be written
// immediately.
//
// O_NOCTTY - When set and path identifies a terminal device, open()
// shall not cause the terminal device to become the controlling terminal
// for the process.
uart0 = open(port, O_RDWR | O_NOCTTY);
if (uart0== -1)
{
perror("unable to open uart ");
return -1;
}
// CONFIGURE THE UART
// The flags defined in /usr/include/termios.h -
// see http://pubs.opengroup.org/onlinepubs/007908799/xsh/termios.h.html
// Baud rate:- B1200, B2400, B4800, B9600, B19200, B38400, B57600,
// B115200, B230400, B460800, B500000, B576000, B921600, B1000000,
// B1152000, B1500000, B2000000, B2500000, B3000000, B3500000, B4000000
// CSIZE:- CS5, CS6, CS7, CS8
// CLOCAL - Ignore modem status lines
// CREAD - Enable receiver
// IGNPAR = Ignore characters with parity errors
// ICRNL - Map CR to NL on input (Use for ASCII comms where you want
// to auto correct end of line characters - don't use for bianry comms!)
// PARENB - Parity enable
// PARODD - Odd parity (else even)
baudbits = baudrate2const(baudrate);
#if DEBUG_LEVEL
fprintf(stderr, "%d -> %x\n", baudrate, baudbits);
#endif
tcgetattr(uart0, &options);
options.c_cflag = baudbits | CS8 | CLOCAL | CREAD; //<Set baud rate
options.c_iflag = IGNPAR;
options.c_oflag = 0;
options.c_lflag = 0;
tcflush(uart0, TCIFLUSH);
tcsetattr(uart0, TCSANOW, &options);
return uart0;
}

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serial/serial.h Normal file
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/*
* serial.h
*/
int prepare_UART(char *port, int bauds);