319 lines
6.2 KiB
C
319 lines
6.2 KiB
C
/*
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* This file is part of the sigrok project.
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*
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* Copyright (C) 2010-2012 Bert Vermeulen <bert@biot.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#ifdef _WIN32
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#include <windows.h>
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#else
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#include <glob.h>
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#include <termios.h>
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#endif
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#include <stdlib.h>
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#include <glib.h>
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#include "libsigrok.h"
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#include "libsigrok-internal.h"
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// FIXME: Must be moved, or rather passed as function argument.
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#ifdef _WIN32
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static HANDLE hdl;
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#endif
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static const char *serial_port_glob[] = {
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/* Linux */
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"/dev/ttyS*",
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"/dev/ttyUSB*",
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"/dev/ttyACM*",
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/* MacOS X */
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"/dev/ttys*",
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"/dev/tty.USB-*",
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"/dev/tty.Modem-*",
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NULL,
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};
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SR_PRIV GSList *list_serial_ports(void)
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{
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GSList *ports;
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#ifdef _WIN32
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/* TODO */
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ports = NULL;
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ports = g_slist_append(ports, g_strdup("COM1"));
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#else
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glob_t g;
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unsigned int i, j;
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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))
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continue;
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for (j = 0; j < g.gl_pathc; j++)
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ports = g_slist_append(ports, g_strdup(g.gl_pathv[j]));
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globfree(&g);
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}
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#endif
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return ports;
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}
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SR_PRIV int serial_open(const char *pathname, int flags)
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{
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#ifdef _WIN32
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/* FIXME: Don't hardcode COM1. */
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hdl = CreateFile("COM1", GENERIC_READ | GENERIC_WRITE, 0, 0,
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OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
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if (hdl == INVALID_HANDLE_VALUE) {
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/* TODO: Error handling. */
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}
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return 0;
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#else
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return open(pathname, flags);
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#endif
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}
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/*
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* Close the serial port.
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* Returns 0 upon success, -1 upon failure.
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*/
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SR_PRIV int serial_close(int fd)
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{
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#ifdef _WIN32
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/* Returns non-zero upon success, 0 upon failure. */
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return (CloseHandle(hdl) == 0) ? -1 : 0;
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#else
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/* Returns 0 upon success, -1 upon failure. */
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return close(fd);
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#endif
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}
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/*
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* Flush serial port buffers (if any).
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* Returns 0 upon success, -1 upon failure.
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*/
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SR_PRIV int serial_flush(int fd)
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{
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#ifdef _WIN32
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/* Returns non-zero upon success, 0 upon failure. */
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return (PurgeComm(hdl, PURGE_RXCLEAR | PURGE_TXCLEAR) == 0) ? -1 : 0;
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#else
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/* Returns 0 upon success, -1 upon failure. */
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return tcflush(fd, TCIOFLUSH);
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#endif
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}
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/*
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* Write a number of bytes to the specified serial port.
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* Returns the number of bytes written, or -1 upon failure.
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*/
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SR_PRIV int serial_write(int fd, const void *buf, size_t count)
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{
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#ifdef _WIN32
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DWORD tmp = 0;
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/* FIXME */
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/* Returns non-zero upon success, 0 upon failure. */
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WriteFile(hdl, buf, count, &tmp, NULL);
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#else
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/* Returns the number of bytes written, or -1 upon failure. */
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return write(fd, buf, count);
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#endif
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}
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/*
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* Read a number of bytes from the specified serial port.
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* Returns the number of bytes read, or -1 upon failure.
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*/
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SR_PRIV int serial_read(int fd, void *buf, size_t count)
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{
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#ifdef _WIN32
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DWORD tmp = 0;
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/* FIXME */
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/* Returns non-zero upon success, 0 upon failure. */
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return ReadFile(hdl, buf, count, &tmp, NULL);
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#else
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/* Returns the number of bytes read, or -1 upon failure. */
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return read(fd, buf, count);
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#endif
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}
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SR_PRIV void *serial_backup_params(int fd)
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{
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#ifdef _WIN32
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/* TODO */
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#else
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struct termios *term;
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/* TODO: 'term' is never g_free()'d? */
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if (!(term = g_try_malloc(sizeof(struct termios)))) {
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sr_err("serial: %s: term malloc failed", __func__);
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return NULL;
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}
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tcgetattr(fd, term);
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return term;
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#endif
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}
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SR_PRIV void serial_restore_params(int fd, void *backup)
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{
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#ifdef _WIN32
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/* TODO */
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#else
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tcsetattr(fd, TCSADRAIN, (struct termios *)backup);
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#endif
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}
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/*
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* Set serial parameters.
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*
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* flowcontrol: 1 = rts/cts, 2 = xon/xoff
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* parity: 0 = none, 1 = even, 2 = odd
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*/
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SR_PRIV int serial_set_params(int fd, int baudrate, int bits, int parity,
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int stopbits, int flowcontrol)
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{
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#ifdef _WIN32
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DCB dcb;
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if (!GetCommState(hdl, &dcb)) {
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/* TODO: Error handling. */
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return SR_ERR;
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}
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switch (baudrate) {
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/* TODO: Support for higher baud rates. */
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case 115200:
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dcb.BaudRate = CBR_115200;
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break;
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case 57600:
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dcb.BaudRate = CBR_57600;
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break;
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case 38400:
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dcb.BaudRate = CBR_38400;
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break;
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case 19200:
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dcb.BaudRate = CBR_19200;
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break;
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case 9600:
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dcb.BaudRate = CBR_9600;
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break;
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default:
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/* TODO: Error handling. */
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break;
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}
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dcb.ByteSize = bits;
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dcb.Parity = NOPARITY; /* TODO: Don't hardcode. */
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dcb.StopBits = ONESTOPBIT; /* TODO: Don't hardcode. */
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if (!SetCommState(hdl, &dcb)) {
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/* TODO: Error handling. */
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return SR_ERR;
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}
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#else
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struct termios term;
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speed_t baud;
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switch (baudrate) {
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case 9600:
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baud = B9600;
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break;
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case 38400:
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baud = B38400;
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break;
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case 57600:
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baud = B57600;
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break;
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case 115200:
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baud = B115200;
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break;
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#ifndef __APPLE__
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case 460800:
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baud = B460800;
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break;
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#endif
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default:
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return SR_ERR;
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}
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if (tcgetattr(fd, &term) < 0)
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return SR_ERR;
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if (cfsetispeed(&term, baud) < 0)
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return SR_ERR;
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term.c_cflag &= ~CSIZE;
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switch (bits) {
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case 8:
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term.c_cflag |= CS8;
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break;
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case 7:
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term.c_cflag |= CS7;
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break;
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default:
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return SR_ERR;
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}
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term.c_cflag &= ~CSTOPB;
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switch (stopbits) {
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case 1:
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break;
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case 2:
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term.c_cflag |= CSTOPB;
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default:
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return SR_ERR;
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}
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term.c_cflag &= ~(IXON | IXOFF | CRTSCTS);
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switch (flowcontrol) {
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case 2:
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term.c_cflag |= IXON | IXOFF;
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break;
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case 1:
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term.c_cflag |= CRTSCTS;
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default:
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return SR_ERR;
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}
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term.c_iflag &= ~IGNPAR;
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term.c_cflag &= ~(PARODD | PARENB);
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switch (parity) {
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case SERIAL_PARITY_NONE:
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term.c_iflag |= IGNPAR;
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break;
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case SERIAL_PARITY_EVEN:
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term.c_cflag |= PARENB;
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break;
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case SERIAL_PARITY_ODD:
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term.c_cflag |= PARENB | PARODD;
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break;
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default:
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return SR_ERR;
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}
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if (tcsetattr(fd, TCSADRAIN, &term) < 0)
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return SR_ERR;
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#endif
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return SR_OK;
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}
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