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/**
* @file serial.c
* @note Copyright (C) 2020 Richard Cochran <richardcochran@gmail.com>
* @note SPDX-License-Identifier: GPL-2.0+
*/
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <termios.h>
#include "print.h"
#include "serial.h"
#define CANONICAL 1
static int open_serial_baud(const char *name, tcflag_t baud, int icrnl, int hwfc)
{
struct termios nterm;
int fd;
fd = open(name, O_RDWR | O_NOCTTY);
if (fd < 0) {
pr_err("cannot open %s : %m", name);
return fd;
}
memset(&nterm, 0, sizeof(nterm));
/* Input Modes */
nterm.c_iflag = IGNPAR; /* Ignore framing errors and parity errors */
if (icrnl) {
/* Translate carriage return to newline on input */
nterm.c_iflag |= ICRNL;
}
/* Output Modes */
nterm.c_oflag = 0;
/* Control Modes */
nterm.c_cflag = baud;
nterm.c_cflag |= CS8; /* Character size */
nterm.c_cflag |= CLOCAL; /* Ignore modem control lines */
nterm.c_cflag |= CREAD; /* Enable receiver */
if (hwfc) {
/* Enable RTS/CTS (hardware) flow control */
nterm.c_cflag |= CRTSCTS;
}
/* Local Modes */
if (CANONICAL) {
nterm.c_lflag = ICANON; /* Enable canonical mode */
}
nterm.c_cc[VTIME] = 10; /* timeout is 10 deciseconds */
nterm.c_cc[VMIN] = 1; /* blocking read until N chars received */
tcflush(fd, TCIFLUSH);
tcsetattr(fd, TCSANOW, &nterm);
return fd;
}
int serial_open(const char *name, int bps, int icrnl, int hwfc)
{
tcflag_t baud;
switch (bps) {
case 1200:
baud = B1200;
break;
case 1800:
baud = B1800;
break;
case 2400:
baud = B2400;
break;
case 4800:
baud = B4800;
break;
case 9600:
baud = B9600;
break;
case 19200:
baud = B19200;
break;
case 38400:
baud = B38400;
break;
case 57600:
baud = B57600;
break;
case 115200:
baud = B115200;
break;
case 230400:
baud = B230400;
break;
case 460800:
baud = B460800;
break;
case 921600:
baud = B921600;
break;
default:
return -1;
}
return open_serial_baud(name, baud, icrnl, hwfc);
}
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