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ptt.c
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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011, 2013, 2014, 2015 John Langner, WB2OSZ
//
// 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 2 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/>.
/*------------------------------------------------------------------
*
* Module: ptt.c
*
* Purpose: Activate the output control lines for push to talk (PTT) and other purposes.
*
* Description: Traditionally this is done with the RTS signal of the serial port.
*
* If we have two radio channels and only one serial port, DTR
* can be used for the second channel.
*
* If __WIN32__ is defined, we use the Windows interface.
* Otherwise we use the Linux interface.
*
* Version 0.9: Add ability to use GPIO pins on Linux.
*
* Version 1.1: Add parallel printer port for x86 Linux only.
*
* This is hardcoded to use the primary motherboard parallel
* printer port at I/O address 0x378. This might work with
* a PCI card configured to use the same address if the
* motherboard does not have a built in parallel port.
* It won't work with a USB-to-parallel-printer-port adapter.
*
* Version 1.2: More than two radio channels.
* Generalize for additional signals besides PTT.
*
* References: http://www.robbayer.com/files/serial-win.pdf
*
* https://www.kernel.org/doc/Documentation/gpio.txt
*
*---------------------------------------------------------------*/
/*
Idea for future enhancement:
A couple people have asked about support for the DMK URI.
This uses a C-Media CM108/CM119 with one interesting addition, a GPIO
pin is used to drive PTT. Here is some related information.
DMK URI:
http://www.dmkeng.com/URI_Order_Page.htm
http://dmkeng.com/images/URI%20Schematic.pdf
http://www.repeater-builder.com/voip/pdf/cm119-datasheet.pdf
Homebrew versions of the same idea:
http://images.ohnosec.org/usbfob.pdf
http://www.qsl.net/kb9mwr/projects/voip/usbfob-119.pdf
http://rtpdir.weebly.com/uploads/1/6/8/7/1687703/usbfob.pdf
http://www.repeater-builder.com/projects/fob/USB-Fob-Construction.pdf
Applications that have support for this:
http://docs.allstarlink.org/drupal/
http://soundmodem.sourcearchive.com/documentation/0.16-1/ptt_8c_source.html
https://github.com/N0NB/hamlib/blob/master/src/cm108.c#L190
Information about the "hidraw" device:
http://unix.stackexchange.com/questions/85379/dev-hidraw-read-permissions
http://www.signal11.us/oss/udev/
http://www.signal11.us/oss/hidapi/
https://github.com/signal11/hidapi/blob/master/libusb/hid.c
http://stackoverflow.com/questions/899008/howto-write-to-the-gpio-pin-of-the-cm108-chip-in-linux
https://www.kernel.org/doc/Documentation/hid/hidraw.txt
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#if __WIN32__
#include <windows.h>
#else
#include <sys/termios.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
/* So we can have more common code for fd. */
typedef int HANDLE;
#define INVALID_HANDLE_VALUE (-1)
#endif
#include "direwolf.h"
#include "textcolor.h"
#include "audio.h"
#include "ptt.h"
#if __WIN32__
#define RTS_ON(fd) EscapeCommFunction(fd,SETRTS);
#define RTS_OFF(fd) EscapeCommFunction(fd,CLRRTS);
#define DTR_ON(fd) EscapeCommFunction(fd,SETDTR);
#define DTR_OFF(fd) EscapeCommFunction(fd,CLRDTR);
#else
#define RTS_ON(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff |= TIOCM_RTS; ioctl (fd, TIOCMSET, &stuff); }
#define RTS_OFF(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff &= ~TIOCM_RTS; ioctl (fd, TIOCMSET, &stuff); }
#define DTR_ON(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff |= TIOCM_DTR; ioctl (fd, TIOCMSET, &stuff); }
#define DTR_OFF(fd) { int stuff; ioctl (fd, TIOCMGET, &stuff); stuff &= ~TIOCM_DTR; ioctl (fd, TIOCMSET, &stuff); }
#define LPT_IO_ADDR 0x378
#endif
#if TEST
#define dw_printf printf
#endif
static int ptt_debug_level = 0;
void ptt_set_debug(int debug)
{
ptt_debug_level = debug;
}
/*-------------------------------------------------------------------
*
* Name: export_gpio
*
* Purpose: Tell the GPIO subsystem to export a GPIO line for
* us to use, and set the initial state of the GPIO.
*
* Inputs: gpio - GPIO line to export
* invert: - Is the GPIO active low?
* direction: - 0 for input, 1 for output
*
* Outputs: None.
*
*------------------------------------------------------------------*/
void export_gpio(int gpio, int invert, int direction)
{
HANDLE fd;
char stemp[80];
struct stat finfo;
int err;
fd = open("/sys/class/gpio/export", O_WRONLY);
if (fd < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow ordinary users to access GPIO.\n");
dw_printf ("Log in as root and type this command:\n");
dw_printf (" chmod go+w /sys/class/gpio/export /sys/class/gpio/unexport\n");
exit (1);
}
snprintf (stemp, sizeof(stemp), "%d", gpio);
if (write (fd, stemp, strlen(stemp)) != strlen(stemp)) {
int e = errno;
/* Ignore EBUSY error which seems to mean */
/* the device node already exists. */
if (e != EBUSY) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing \"%s\" to /sys/class/gpio/export, errno=%d\n", stemp, e);
dw_printf ("%s\n", strerror(e));
exit (1);
}
}
close (fd);
/*
Idea for future:
On the RPi, the device path for GPIO number XX is /sys/class/gpio/gpioXX.
There was a report that it is different for the Cubieboard. For instance
GPIO 61 has gpio61_pi13 in the path. This indicates connector "i" pin 13.
For another similar single board computer, we find the same thing:
https://www.olimex.com/wiki/A20-OLinuXino-LIME#GPIO_under_Linux
How should we deal with this? Some possibilities:
(1) The user might explicitly mention the name in direwolf.conf.
(2) We might be able to find the names in some system device config file.
(3) Get a directory listing of /sys/class/gpio then search for a
matching name. Suppose we wanted GPIO 61. First look for an exact
match to "gpio61". If that is not found, look for something
matching the pattern "gpio61_*".
*/
/*
* We will have the same permission problem if not root.
* We only care about "direction" and "value".
*/
snprintf (stemp, sizeof(stemp), "sudo chmod go+rw /sys/class/gpio/gpio%d/direction", gpio);
err = system (stemp);
snprintf (stemp, sizeof(stemp), "sudo chmod go+rw /sys/class/gpio/gpio%d/value", gpio);
err = system (stemp);
snprintf (stemp, sizeof(stemp), "/sys/class/gpio/gpio%d/value", gpio);
if (stat(stemp, &finfo) < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Failed to get status for %s \n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}
if (geteuid() != 0) {
if ( ! (finfo.st_mode & S_IWOTH)) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow ordinary users to access GPIO.\n");
dw_printf ("Log in as root and type these commands:\n");
dw_printf (" chmod go+rw /sys/class/gpio/gpio%d/direction", gpio);
dw_printf (" chmod go+rw /sys/class/gpio/gpio%d/value", gpio);
exit (1);
}
}
/*
* Set output direction and initial state
*/
snprintf (stemp, sizeof(stemp), "/sys/class/gpio/gpio%d/direction", gpio);
fd = open(stemp, O_WRONLY);
if (fd < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error opening %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}
char gpio_val[8];
if (direction) {
if (invert) {
strlcpy (gpio_val, "high", sizeof(gpio_val));
}
else {
strlcpy (gpio_val, "low", sizeof(gpio_val));
}
}
else {
strlcpy (gpio_val, "in", sizeof(gpio_val));
}
if (write (fd, gpio_val, strlen(gpio_val)) != strlen(gpio_val)) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing initial state to %s\n", stemp);
dw_printf ("%s\n", strerror(e));
exit (1);
}
close (fd);
}
/*-------------------------------------------------------------------
*
* Name: ptt_init
*
* Purpose: Open serial port(s) used for PTT signals and set to proper state.
*
* Inputs: audio_config_p - Structure with communication parameters.
*
* for each channel we have:
*
* ptt_method Method for PTT signal.
* PTT_METHOD_NONE - not configured. Could be using VOX.
* PTT_METHOD_SERIAL - serial (com) port.
* PTT_METHOD_GPIO - general purpose I/O.
* PTT_METHOD_LPT - Parallel printer port.
*
* ptt_device Name of serial port device.
* e.g. COM1 or /dev/ttyS0.
*
* ptt_line RTS or DTR when using serial port.
*
* ptt_gpio GPIO number. Only used for Linux.
* Valid only when ptt_method is PTT_METHOD_GPIO.
*
* ptt_lpt_bit Bit number for parallel printer port.
* Bit 0 = pin 2, ..., bit 7 = pin 9.
* Valid only when ptt_method is PTT_METHOD_LPT.
*
* ptt_invert Invert the signal.
* Normally higher voltage means transmit or LED on.
*
* Outputs: Remember required information for future use.
*
* Description:
*
*--------------------------------------------------------------------*/
static struct audio_s *save_audio_config_p; /* Save config information for later use. */
static HANDLE ptt_fd[MAX_CHANS][NUM_OCTYPES];
/* Serial port handle or fd. */
/* Could be the same for two channels */
/* if using both RTS and DTR. */
static char otnames[NUM_OCTYPES][8];
void ptt_init (struct audio_s *audio_config_p)
{
int ch;
HANDLE fd = INVALID_HANDLE_VALUE;
#if __WIN32__
#else
int using_gpio;
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("ptt_init ( ... )\n");
#endif
save_audio_config_p = audio_config_p;
strlcpy (otnames[OCTYPE_PTT], "PTT", sizeof(otnames[OCTYPE_PTT]));
strlcpy (otnames[OCTYPE_DCD], "DCD", sizeof(otnames[OCTYPE_DCD]));
strlcpy (otnames[OCTYPE_FUTURE], "FUTURE", sizeof(otnames[OCTYPE_FUTURE]));
for (ch = 0; ch < MAX_CHANS; ch++) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
ptt_fd[ch][ot] = INVALID_HANDLE_VALUE;
if (ptt_debug_level >= 2) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("ch=%d, %s method=%d, device=%s, line=%d, gpio=%d, lpt_bit=%d, invert=%d\n",
ch,
otnames[ot],
audio_config_p->achan[ch].octrl[ot].ptt_method,
audio_config_p->achan[ch].octrl[ot].ptt_device,
audio_config_p->achan[ch].octrl[ot].ptt_line,
audio_config_p->achan[ch].octrl[ot].ptt_gpio,
audio_config_p->achan[ch].octrl[ot].ptt_lpt_bit,
audio_config_p->achan[ch].octrl[ot].ptt_invert);
}
}
}
/*
* Set up serial ports.
*/
for (ch = 0; ch < MAX_CHANS; ch++) {
if (audio_config_p->achan[ch].valid) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_SERIAL) {
#if __WIN32__
#else
/* Translate Windows device name into Linux name. */
/* COM1 -> /dev/ttyS0, etc. */
if (strncasecmp(audio_config_p->achan[ch].octrl[ot].ptt_device, "COM", 3) == 0) {
int n = atoi (audio_config_p->achan[ch].octrl[ot].ptt_device + 3);
text_color_set(DW_COLOR_INFO);
dw_printf ("Converted %s device '%s'", audio_config_p->achan[ch].octrl[ot].ptt_device, otnames[ot]);
if (n < 1) n = 1;
snprintf (audio_config_p->achan[ch].octrl[ot].ptt_device, sizeof(audio_config_p->achan[ch].octrl[ot].ptt_device), "/dev/ttyS%d", n-1);
dw_printf (" to Linux equivalent '%s'\n", audio_config_p->achan[ch].octrl[ot].ptt_device);
}
#endif
/* Can't open the same device more than once so we */
/* need more logic to look for the case of multiple radio */
/* channels using different pins of the same COM port. */
/* Did some earlier channel use the same device name? */
int same_device_used = 0;
int j, k;
for (j = ch; j >= 0; j--) {
if (audio_config_p->achan[j].valid) {
for (k = ((j==ch) ? (ot - 1) : (NUM_OCTYPES-1)); k >= 0; k--) {
if (strcmp(audio_config_p->achan[ch].octrl[ot].ptt_device,audio_config_p->achan[j].octrl[k].ptt_device) == 0) {
fd = ptt_fd[j][k];
same_device_used = 1;
}
}
}
}
if ( ! same_device_used) {
#if __WIN32__
char bettername[50];
// Bug fix in release 1.1 - Need to munge name for COM10 and up.
// http://support.microsoft.com/kb/115831
strlcpy (bettername, audio_config_p->achan[ch].octrl[ot].ptt_device, sizeof(bettername));
if (strncasecmp(bettername, "COM", 3) == 0) {
int n;
n = atoi(bettername+3);
if (n >= 10) {
strlcpy (bettername, "\\\\.\\", sizeof(bettername));
strlcat (bettername, audio_config_p->achan[ch].octrl[ot].ptt_device, sizeof(bettername));
}
}
fd = CreateFile(bettername,
GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
#else
/* O_NONBLOCK added in version 0.9. */
/* Was hanging with some USB-serial adapters. */
/* https://bugs.launchpad.net/ubuntu/+source/linux/+bug/661321/comments/12 */
fd = open (audio_config_p->achan[ch].octrl[ot].ptt_device, O_RDONLY | O_NONBLOCK);
#endif
}
if (fd != INVALID_HANDLE_VALUE) {
ptt_fd[ch][ot] = fd;
}
else {
#if __WIN32__
#else
int e = errno;
#endif
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR can't open device %s for channel %d PTT control.\n",
audio_config_p->achan[ch].octrl[ot].ptt_device, ch);
#if __WIN32__
#else
dw_printf ("%s\n", strerror(errno));
#endif
/* Don't try using it later if device open failed. */
audio_config_p->achan[ch].octrl[ot].ptt_method = PTT_METHOD_NONE;
}
/*
* Set initial state off.
* ptt_set will invert output signal if appropriate.
*/
ptt_set (ot, ch, 0);
} /* if serial method. */
} /* for each output type. */
} /* if channel valid. */
} /* For each channel. */
/*
* Set up GPIO - for Linux only.
*/
#if __WIN32__
#else
/*
* Does any of them use GPIO?
*/
using_gpio = 0;
for (ch=0; ch<MAX_CHANS; ch++) {
if (save_audio_config_p->achan[ch].valid) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_GPIO) {
using_gpio = 1;
}
}
for (ot = 0; ot < NUM_ICTYPES; ot++) {
if (audio_config_p->achan[ch].ictrl[ot].method == PTT_METHOD_GPIO) {
using_gpio = 1;
}
}
}
}
if (using_gpio) {
struct stat finfo;
/*
* Normally the device nodes are set up for access
* only by root. Try to change it here so we don't
* burden user with another configuration step.
*
* Does /sys/class/gpio/export even exist?
*/
if (stat("/sys/class/gpio/export", &finfo) < 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("This system is not configured with the GPIO user interface.\n");
dw_printf ("Use a different method for PTT control.\n");
exit (1);
}
/*
* Do we have permission to access it?
*
* pi@raspberrypi /sys/class/gpio $ ls -l
* total 0
* --w------- 1 root root 4096 Aug 20 07:59 export
* lrwxrwxrwx 1 root root 0 Aug 20 07:59 gpiochip0 -> ../../devices/virtual/gpio/gpiochip0
* --w------- 1 root root 4096 Aug 20 07:59 unexport
*/
if (geteuid() != 0) {
if ( ! (finfo.st_mode & S_IWOTH)) {
int err;
/* Try to change protection. */
err = system ("sudo chmod go+w /sys/class/gpio/export /sys/class/gpio/unexport");
if (stat("/sys/class/gpio/export", &finfo) < 0) {
/* Unexpected because we could do it before. */
text_color_set(DW_COLOR_ERROR);
dw_printf ("This system is not configured with the GPIO user interface.\n");
dw_printf ("Use a different method for PTT control.\n");
exit (1);
}
/* Did we succeed in changing the protection? */
if ( ! (finfo.st_mode & S_IWOTH)) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Permissions do not allow ordinary users to access GPIO.\n");
dw_printf ("Log in as root and type this command:\n");
dw_printf (" chmod go+w /sys/class/gpio/export /sys/class/gpio/unexport\n");
exit (1);
}
}
}
}
/*
* We should now be able to create the device nodes for
* the pins we want to use.
*/
for (ch = 0; ch < MAX_CHANS; ch++) {
if (save_audio_config_p->achan[ch].valid) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_GPIO) {
export_gpio(audio_config_p->achan[ch].octrl[ot].ptt_gpio, audio_config_p->achan[ch].octrl[ot].ptt_invert, 1);
}
}
for (ot = 0; ot < NUM_ICTYPES; ot++) {
if (audio_config_p->achan[ch].ictrl[ot].method == PTT_METHOD_GPIO) {
export_gpio(audio_config_p->achan[ch].ictrl[ot].gpio, audio_config_p->achan[ch].ictrl[ot].invert, 0);
}
}
}
}
#endif
/*
* Set up parallel printer port.
*
* Restrictions:
* Only the primary printer port.
* For x86 Linux only.
*/
#if ( defined(__i386__) || defined(__x86_64__) ) && ( defined(__linux__) || defined(__unix__) )
for (ch = 0; ch < MAX_CHANS; ch++) {
if (save_audio_config_p->achan[ch].valid) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (audio_config_p->achan[ch].octrl[ot].ptt_method == PTT_METHOD_LPT) {
/* Can't open the same device more than once so we */
/* need more logic to look for the case of mutiple radio */
/* channels using different pins of the LPT port. */
/* Did some earlier channel use the same ptt device name? */
int same_device_used = 0;
int j, k;
for (j = ch; j >= 0; j--) {
if (audio_config_p->achan[j].valid) {
for (k = ((j==ch) ? (ot - 1) : (NUM_OCTYPES-1)); k >= 0; k--) {
if (strcmp(audio_config_p->achan[ch].octrl[ot].ptt_device,audio_config_p->achan[j].octrl[k].ptt_device) == 0) {
fd = ptt_fd[j][k];
same_device_used = 1;
}
}
}
}
if ( ! same_device_used) {
fd = open ("/dev/port", O_RDWR | O_NDELAY);
}
if (fd != INVALID_HANDLE_VALUE) {
ptt_fd[ch][ot] = fd;
}
else {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR - Can't open /dev/port for parallel printer port PTT control.\n");
dw_printf ("%s\n", strerror(errno));
dw_printf ("You probably don't have adequate permissions to access I/O ports.\n");
dw_printf ("Either run direwolf as root or change these permissions:\n");
dw_printf (" sudo chmod go+rw /dev/port\n");
dw_printf (" sudo setcap cap_sys_rawio=ep `which direwolf`\n");
/* Don't try using it later if device open failed. */
audio_config_p->achan[ch].octrl[ot].ptt_method = PTT_METHOD_NONE;
}
/*
* Set initial state off.
* ptt_set will invert output signal if appropriate.
*/
ptt_set (ot, ch, 0);
} /* if parallel printer port method. */
} /* for each output type */
} /* if valid channel. */
} /* For each channel. */
#endif /* x86 Linux */
/* Why doesn't it transmit? Probably forgot to specify PTT option. */
for (ch=0; ch<MAX_CHANS; ch++) {
if (audio_config_p->achan[ch].valid) {
if(audio_config_p->achan[ch].octrl[OCTYPE_PTT].ptt_method == PTT_METHOD_NONE) {
text_color_set(DW_COLOR_INFO);
dw_printf ("Note: PTT not configured for channel %d. (Ignore this if using VOX.)\n", ch);
}
}
}
} /* end ptt_init */
/*-------------------------------------------------------------------
*
* Name: ptt_set
*
* Purpose: Turn output control line on or off.
* Originally this was just for PTT, hence the name.
* Now that it is more general purpose, it should
* probably be renamed something like octrl_set.
*
* Inputs: ot - Output control type:
* OCTYPE_PTT, OCTYPE_DCD, OCTYPE_FUTURE
*
* chan - channel, 0 .. (number of channels)-1
*
* ptt_signal - 1 for transmit, 0 for receive.
*
*
* Assumption: ptt_init was called first.
*
* Description: Set the RTS or DTR line or GPIO pin.
* More positive output corresponds to 1 unless invert is set.
*
*--------------------------------------------------------------------*/
void ptt_set (int ot, int chan, int ptt_signal)
{
int ptt = ptt_signal;
int ptt2 = ptt_signal;
assert (ot >= 0 && ot < NUM_OCTYPES);
assert (chan >= 0 && chan < MAX_CHANS);
if (ptt_debug_level >= 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("%s %d = %d\n", otnames[ot], chan, ptt_signal);
}
assert (chan >= 0 && chan < MAX_CHANS);
if ( ! save_audio_config_p->achan[chan].valid) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Internal error, ptt_set ( %s, %d, %d ), did not expect invalid channel.\n", otnames[ot], chan, ptt);
return;
}
/*
* Inverted output?
*/
if (save_audio_config_p->achan[chan].octrl[ot].ptt_invert) {
ptt = ! ptt;
}
if (save_audio_config_p->achan[chan].octrl[ot].ptt_invert2) {
ptt2 = ! ptt2;
}
/*
* Using serial port?
*/
if (save_audio_config_p->achan[chan].octrl[ot].ptt_method == PTT_METHOD_SERIAL &&
ptt_fd[chan][ot] != INVALID_HANDLE_VALUE) {
if (save_audio_config_p->achan[chan].octrl[ot].ptt_line == PTT_LINE_RTS) {
if (ptt) {
RTS_ON(ptt_fd[chan][ot]);
}
else {
RTS_OFF(ptt_fd[chan][ot]);
}
}
else if (save_audio_config_p->achan[chan].octrl[ot].ptt_line == PTT_LINE_DTR) {
if (ptt) {
DTR_ON(ptt_fd[chan][ot]);
}
else {
DTR_OFF(ptt_fd[chan][ot]);
}
}
/*
* Second serial port control line? Typically driven with opposite phase but could be in phase.
*/
if (save_audio_config_p->achan[chan].octrl[ot].ptt_line2 == PTT_LINE_RTS) {
if (ptt2) {
RTS_ON(ptt_fd[chan][ot]);
}
else {
RTS_OFF(ptt_fd[chan][ot]);
}
}
else if (save_audio_config_p->achan[chan].octrl[ot].ptt_line2 == PTT_LINE_DTR) {
if (ptt2) {
DTR_ON(ptt_fd[chan][ot]);
}
else {
DTR_OFF(ptt_fd[chan][ot]);
}
}
/* else neither one */
}
/*
* Using GPIO?
*/
#if __WIN32__
#else
if (save_audio_config_p->achan[chan].octrl[ot].ptt_method == PTT_METHOD_GPIO) {
int fd;
char stemp[80];
snprintf (stemp, sizeof(stemp), "/sys/class/gpio/gpio%d/value", save_audio_config_p->achan[chan].octrl[ot].ptt_gpio);
fd = open(stemp, O_WRONLY);
if (fd < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error opening %s to set %s signal.\n", stemp, otnames[ot]);
dw_printf ("%s\n", strerror(e));
return;
}
snprintf (stemp, sizeof(stemp), "%d", ptt);
if (write (fd, stemp, 1) != 1) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error setting GPIO %d for %s\n", save_audio_config_p->achan[chan].octrl[ot].ptt_gpio, otnames[ot]);
dw_printf ("%s\n", strerror(e));
}
close (fd);
}
#endif
/*
* Using parallel printer port?
*/
#if ( defined(__i386__) || defined(__x86_64__) ) && ( defined(__linux__) || defined(__unix__) )
if (save_audio_config_p->achan[chan].octrl[ot].ptt_method == PTT_METHOD_LPT &&
ptt_fd[chan][ot] != INVALID_HANDLE_VALUE) {
char lpt_data;
ssize_t n;
lseek (ptt_fd[chan][ot], (off_t)LPT_IO_ADDR, SEEK_SET);
if (read (ptt_fd[chan][ot], &lpt_data, (size_t)1) != 1) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error reading current state of LPT for channel %d %s\n", chan, otnames[ot]);
dw_printf ("%s\n", strerror(e));
}
if (ptt) {
lpt_data |= ( 1 << save_audio_config_p->achan[chan].octrl[ot].ptt_lpt_bit );
}
else {
lpt_data &= ~ ( 1 << save_audio_config_p->achan[chan].octrl[ot].ptt_lpt_bit );
}
lseek (ptt_fd[chan][ot], (off_t)LPT_IO_ADDR, SEEK_SET);
if (write (ptt_fd[chan][ot], &lpt_data, (size_t)1) != 1) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error writing to LPT for channel %d %s\n", chan, otnames[ot]);
dw_printf ("%s\n", strerror(e));
}
}
#endif /* x86 Linux */
} /* end ptt_set */
/*-------------------------------------------------------------------
*
* Name: get_input
*
* Purpose: Read the value of an input line
*
* Inputs: it - Input type (ICTYPE_TCINH supported so far)
* chan - Audio channel number
*
* Outputs: 0 = inactive, 1 = active, -1 = error
*
* ------------------------------------------------------------------*/
int get_input (int it, int chan)
{
assert (it >= 0 && it < NUM_ICTYPES);
assert (chan >= 0 && chan < MAX_CHANS);
if ( ! save_audio_config_p->achan[chan].valid) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Internal error, get_input ( %d, %d ), did not expect invalid channel.\n", it, chan);
return -1;
}
#if __WIN32__
#else
if (save_audio_config_p->achan[chan].ictrl[it].method == PTT_METHOD_GPIO) {
int fd;
char stemp[80];
snprintf (stemp, sizeof(stemp), "/sys/class/gpio/gpio%d/value", save_audio_config_p->achan[chan].ictrl[it].gpio);
fd = open(stemp, O_RDONLY);
if (fd < 0) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error opening %s to check input.\n", stemp);
dw_printf ("%s\n", strerror(e));
return -1;
}
char vtemp[2];
if (read (fd, vtemp, 1) != 1) {
int e = errno;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Error getting GPIO %d value\n", save_audio_config_p->achan[chan].ictrl[it].gpio);
dw_printf ("%s\n", strerror(e));
}
close (fd);
if (atoi(vtemp) != save_audio_config_p->achan[chan].ictrl[it].invert) {
return 1;
}
else {
return 0;
}
}
#endif
return -1; /* Method was none, or something went wrong */
}
/*-------------------------------------------------------------------
*
* Name: ptt_term
*
* Purpose: Make sure PTT and others are turned off when we exit.
*
* Inputs: none
*
* Description:
*
*--------------------------------------------------------------------*/
void ptt_term (void)
{
int n;
for (n = 0; n < MAX_CHANS; n++) {
if (save_audio_config_p->achan[n].valid) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
ptt_set (ot, n, 0);
}
}
}
for (n = 0; n < MAX_CHANS; n++) {
if (save_audio_config_p->achan[n].valid) {
int ot;
for (ot = 0; ot < NUM_OCTYPES; ot++) {
if (ptt_fd[n][ot] != INVALID_HANDLE_VALUE) {
#if __WIN32__
CloseHandle (ptt_fd[n][ot]);
#else
close(ptt_fd[n][ot]);
#endif
ptt_fd[n][ot] = INVALID_HANDLE_VALUE;
}
}
}
}
}
/*
* Quick stand-alone test for above.
*
* gcc -DTEST -o ptest ptt.c ; ./ptest
*
*/
#if TEST
void text_color_set (dw_color_t c) { }
#define dw_printf printf
main ()
{
struct audio_s my_audio_config;
int n;
int chan;
memset (&my_audio_config, 0, sizeof(my_audio_config));
my_audio_config.adev[0].num_channels = 2;
my_audio_config.valid[0] = 1;
my_audio_config.adev[0].octrl[OCTYPE_PTT].ptt_method = PTT_METHOD_SERIAL;
//strlcpy (my_audio_config.ptt_device, "COM1", sizeof(my_audio_config.ptt_device));
strlcpy (my_audio_config.ptt_device, "/dev/ttyUSB0", sizeof(my_audio_config.ptt_device));
my_audio_config.adev[0].octrl[OCTYPE_PTT].ptt_line = PTT_LINE_RTS;
my_audio_config.valid[1] = 1;
my_audio_config.adev[1].octrl[OCTYPE_PTT].ptt_method = PTT_METHOD_SERIAL;
//strlcpy (my_audio_config.adev[1].octrl[OCTYPE_PTT].ptt_device, "COM1", sizeof(my_audio_config.adev[1].octrl[OCTYPE_PTT].ptt_device));