libsigrok/hardware/common/serial.c

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/*
* This file is part of the sigrok project.
*
* Copyright (C) 2010 Bert Vermeulen <bert@biot.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
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#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifdef _WIN32
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#include <windows.h>
#else
#include <glob.h>
#include <termios.h>
#endif
#include <stdlib.h>
#include <glib.h>
#include "sigrok.h"
#include "sigrok-internal.h"
// FIXME: Must be moved, or rather passed as function argument.
#ifdef _WIN32
static HANDLE hdl;
#endif
static const char *serial_port_glob[] = {
/* Linux */
"/dev/ttyS*",
"/dev/ttyUSB*",
"/dev/ttyACM*",
/* MacOS X */
"/dev/ttys*",
"/dev/tty.USB-*",
"/dev/tty.Modem-*",
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NULL,
};
SR_PRIV GSList *list_serial_ports(void)
{
GSList *ports;
#ifdef _WIN32
/* TODO */
ports = NULL;
ports = g_slist_append(ports, strdup("COM1"));
#else
glob_t g;
unsigned int i, j;
ports = NULL;
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for (i = 0; serial_port_glob[i]; i++) {
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if (glob(serial_port_glob[i], 0, NULL, &g))
continue;
for (j = 0; j < g.gl_pathc; j++)
ports = g_slist_append(ports, strdup(g.gl_pathv[j]));
globfree(&g);
}
#endif
return ports;
}
SR_PRIV int serial_open(const char *pathname, int flags)
{
#ifdef _WIN32
/* FIXME: Don't hardcode COM1. */
hdl = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, 0,
OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
if (hdl == INVALID_HANDLE_VALUE) {
/* TODO: Error handling. */
}
return 0;
#else
return open(pathname, flags);
#endif
}
/*
* Close the serial port.
* Returns 0 upon success, -1 upon failure.
*/
SR_PRIV int serial_close(int fd)
{
#ifdef _WIN32
/* Returns non-zero upon success, 0 upon failure. */
return (CloseHandle(hdl) == 0) ? -1 : 0;
#else
/* Returns 0 upon success, -1 upon failure. */
return close(fd);
#endif
}
/*
* Flush serial port buffers (if any).
* Returns 0 upon success, -1 upon failure.
*/
SR_PRIV int serial_flush(int fd)
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{
#ifdef _WIN32
/* Returns non-zero upon success, 0 upon failure. */
return (PurgeComm(hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0) ? -1 : 0;
#else
/* Returns 0 upon success, -1 upon failure. */
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return tcflush(fd, TCIOFLUSH);
#endif
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}
/*
* Write a number of bytes to the specified serial port.
* Returns the number of bytes written, or -1 upon failure.
*/
SR_PRIV int serial_write(int fd, const void *buf, size_t count)
{
#ifdef _WIN32
DWORD tmp = 0;
/* FIXME */
/* Returns non-zero upon success, 0 upon failure. */
WriteFile(hdl, buf, count, &tmp, NULL);
#else
/* Returns the number of bytes written, or -1 upon failure. */
return write(fd, buf, count);
#endif
}
/*
* Read a number of bytes from the specified serial port.
* Returns the number of bytes read, or -1 upon failure.
*/
SR_PRIV int serial_read(int fd, void *buf, size_t count)
{
#ifdef _WIN32
DWORD tmp = 0;
/* FIXME */
/* Returns non-zero upon success, 0 upon failure. */
return ReadFile(hdl, buf, count, &tmp, NULL);
#else
/* Returns the number of bytes read, or -1 upon failure. */
return read(fd, buf, count);
#endif
}
SR_PRIV void *serial_backup_params(int fd)
{
#ifdef _WIN32
/* TODO */
#else
struct termios *term;
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/* TODO: 'term' is never g_free()'d? */
if (!(term = g_try_malloc(sizeof(struct termios)))) {
sr_err("serial: %s: term malloc failed", __func__);
return NULL;
}
tcgetattr(fd, term);
return term;
#endif
}
SR_PRIV void serial_restore_params(int fd, void *backup)
{
#ifdef _WIN32
/* TODO */
#else
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tcsetattr(fd, TCSADRAIN, (struct termios *)backup);
#endif
}
/*
* Set serial parameters.
*
* flowcontrol: 1 = rts/cts, 2 = xon/xoff
* parity: 0 = none, 1 = even, 2 = odd
*/
SR_PRIV int serial_set_params(int fd, int speed, int bits, int parity,
int stopbits, int flowcontrol)
{
#ifdef _WIN32
DCB dcb;
if (!GetCommState(hdl, &dcb)) {
/* TODO: Error handling. */
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return SR_ERR;
}
/* TODO: Rename 'speed' to 'baudrate'. */
switch(speed) {
/* TODO: Support for higher baud rates. */
case 115200:
dcb.BaudRate = CBR_115200;
break;
case 57600:
dcb.BaudRate = CBR_57600;
break;
case 38400:
dcb.BaudRate = CBR_38400;
break;
case 19200:
dcb.BaudRate = CBR_19200;
break;
case 9600:
dcb.BaudRate = CBR_9600;
break;
default:
/* TODO: Error handling. */
break;
}
dcb.ByteSize = bits;
dcb.Parity = NOPARITY; /* TODO: Don't hardcode. */
dcb.StopBits = ONESTOPBIT; /* TODO: Don't hardcode. */
if (!SetCommState(hdl, &dcb)) {
/* TODO: Error handling. */
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return SR_ERR;
}
#else
struct termios term;
speed_t baud;
switch (speed) {
case 9600:
baud = B9600;
break;
case 38400:
baud = B38400;
break;
case 57600:
baud = B57600;
break;
case 115200:
baud = B115200;
break;
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#ifndef __APPLE__
case 460800:
baud = B460800;
break;
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#endif
default:
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return SR_ERR;
}
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if (tcgetattr(fd, &term) < 0)
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return SR_ERR;
if (cfsetispeed(&term, baud) < 0)
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return SR_ERR;
term.c_cflag &= ~CSIZE;
switch (bits) {
case 8:
term.c_cflag |= CS8;
break;
case 7:
term.c_cflag |= CS7;
break;
default:
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return SR_ERR;
}
term.c_cflag &= ~CSTOPB;
switch (stopbits) {
case 1:
break;
case 2:
term.c_cflag |= CSTOPB;
default:
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return SR_ERR;
}
term.c_cflag &= ~(IXON | IXOFF | CRTSCTS);
switch (flowcontrol) {
case 2:
term.c_cflag |= IXON | IXOFF;
break;
case 1:
term.c_cflag |= CRTSCTS;
default:
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return SR_ERR;
}
term.c_iflag &= ~IGNPAR;
term.c_cflag &= ~(PARODD | PARENB);
switch (parity) {
case 0:
term.c_iflag |= IGNPAR;
break;
case 1:
term.c_cflag |= PARENB;
break;
case 2:
term.c_cflag |= PARENB | PARODD;
break;
default:
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return SR_ERR;
}
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if (tcsetattr(fd, TCSADRAIN, &term) < 0)
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return SR_ERR;
#endif
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return SR_OK;
}