int demod_init (struct audio_s *pa)
{
int j;
int chan; /* Loop index over number of radio channels. */
char profile;
/*
* Save audio configuration for later use.
*/
save_audio_config_p = pa;
for (chan = 0; chan < MAX_CHANS; chan++) {
if (save_audio_config_p->achan[chan].valid) {
char *p;
char just_letters[16];
int num_letters;
int have_plus;
switch (save_audio_config_p->achan[chan].modem_type) {
case MODEM_OFF:
break;
case MODEM_AFSK:
/*
* Tear apart the profile and put it back together in a normalized form:
* - At least one letter, supply suitable default if necessary.
* - Upper case only.
* - Any plus will be at the end.
*/
num_letters = 0;
just_letters[num_letters] = '\0';
have_plus = 0;
for (p = save_audio_config_p->achan[chan].profiles; *p != '\0'; p++) {
if (islower(*p)) {
just_letters[num_letters] = toupper(*p);
num_letters++;
just_letters[num_letters] = '\0';
}
else if (isupper(*p)) {
just_letters[num_letters] = *p;
num_letters++;
just_letters[num_letters] = '\0';
}
else if (*p == '+') {
have_plus = 1;
if (p[1] != '\0') {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Channel %d: + option must appear at end of demodulator types \"%s\" \n",
chan, save_audio_config_p->achan[chan].profiles);
}
}
else if (*p == '-') {
have_plus = -1;
if (p[1] != '\0') {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Channel %d: - option must appear at end of demodulator types \"%s\" \n",
chan, save_audio_config_p->achan[chan].profiles);
}
} else {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Channel %d: Demodulator types \"%s\" can contain only letters and + - characters.\n",
chan, save_audio_config_p->achan[chan].profiles);
}
}
assert (num_letters == strlen(just_letters));
/*
* Pick a good default demodulator if none specified.
*/
if (num_letters == 0) {
if (save_audio_config_p->achan[chan].baud < 600) {
/* This has been optimized for 300 baud. */
strcpy (just_letters, "D");
}
else {
#if __arm__
/* We probably don't have a lot of CPU power available. */
/* Previously we would use F if possible otherwise fall back to A. */
#if 0
if (save_audio_config_p->achan[chan].baud == FFF_BAUD &&
save_audio_config_p->achan[chan].mark_freq == FFF_MARK_FREQ &&
save_audio_config_p->achan[chan].space_freq == FFF_SPACE_FREQ &&
save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec == FFF_SAMPLES_PER_SEC) {
just_letters[0] = FFF_PROFILE;
just_letters[1] = '\0';
}
else {
strcpy (just_letters, "A");
}
#else
/* In version 1.2, new default is E+ /3. */
strcpy (just_letters, "E"); // version 1.2 now E.
if (have_plus != -1) have_plus = 1; // Add as default for version 1.2
// If not explicitly turned off.
if (save_audio_config_p->achan[chan].decimate == 0) {
save_audio_config_p->achan[chan].decimate = 3;
}
#endif
#else
strcpy (just_letters, "E"); // version 1.2 changed C to E.
if (have_plus != -1) have_plus = 1; // Add as default for version 1.2
// If not explicitly turned off.
#endif
}
num_letters = 1;
}
assert (num_letters == strlen(just_letters));
/*
* Put it back together again.
*/
/* At this point, have_plus can have 3 values: */
/* 1 = turned on, either explicitly or by applied default */
/* -1 = explicitly turned off. change to 0 here so it is false. */
/* 0 = off by default. */
if (have_plus == -1) have_plus = 0;
strcpy (save_audio_config_p->achan[chan].profiles, just_letters);
assert (strlen(save_audio_config_p->achan[chan].profiles) >= 1);
if (have_plus) {
strcat (save_audio_config_p->achan[chan].profiles, "+");
}
/* These can be increased later for the multi-frequency case. */
save_audio_config_p->achan[chan].num_subchan = num_letters;
save_audio_config_p->achan[chan].num_demod = num_letters;
/*
* Some error checking - Can use only one of these:
*
* - Multiple letters.
* - New + multi-slicer.
* - Multiple frequencies.
*/
if (have_plus && num_letters > 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Channel %d: Demodulator + option can't be combined with multiple letters.\n", chan);
strcpy (save_audio_config_p->achan[chan].profiles, "C+"); // Reduce to one letter.
num_letters = 1;
save_audio_config_p->achan[chan].num_demod = 1;
save_audio_config_p->achan[chan].num_subchan = 1; // Will be set higher later.
save_audio_config_p->achan[chan].num_freq = 1;
}
if (have_plus && save_audio_config_p->achan[chan].num_freq > 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Channel %d: Demodulator + option can't be combined with multiple frequencies.\n", chan);
save_audio_config_p->achan[chan].num_demod = 1;
save_audio_config_p->achan[chan].num_subchan = 1; // Will be set higher later.
save_audio_config_p->achan[chan].num_freq = 1;
}
if (num_letters > 1 && save_audio_config_p->achan[chan].num_freq > 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Channel %d: Multiple demodulator types can't be combined with multiple frequencies.\n", chan);
save_audio_config_p->achan[chan].profiles[1] = '\0';
num_letters = 1;
}
if (save_audio_config_p->achan[chan].decimate == 0) {
save_audio_config_p->achan[chan].decimate = 1;
if (strchr (just_letters, 'D') != NULL && save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec > 40000) {
save_audio_config_p->achan[chan].decimate = 3;
}
}
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Channel %d: %d baud, AFSK %d & %d Hz, %s, %d sample rate",
chan, save_audio_config_p->achan[chan].baud,
save_audio_config_p->achan[chan].mark_freq, save_audio_config_p->achan[chan].space_freq,
save_audio_config_p->achan[chan].profiles,
save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec);
if (save_audio_config_p->achan[chan].decimate != 1)
dw_printf (" / %d", save_audio_config_p->achan[chan].decimate);
if (save_audio_config_p->achan[chan].dtmf_decode != DTMF_DECODE_OFF)
dw_printf (", DTMF decoder enabled");
dw_printf (".\n");
/*
* Initialize the demodulator(s).
*
* We have 3 cases to consider.
*/
if (num_letters > 1) {
int d;
/*
* Multiple letters, usually for 1200 baud.
* Each one corresponds to a demodulator and subchannel.
*
* An interesting experiment but probably not too useful.
* Can't have multiple frequency pairs or the + option.
*/
save_audio_config_p->achan[chan].num_subchan = num_letters;
save_audio_config_p->achan[chan].num_demod = num_letters;
if (save_audio_config_p->achan[chan].num_demod != num_letters) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("INTERNAL ERROR, %s:%d, chan=%d, num_demod(%d) != strlen(\"%s\")\n",
__FILE__, __LINE__, chan, save_audio_config_p->achan[chan].num_demod, save_audio_config_p->achan[chan].profiles);
}
if (save_audio_config_p->achan[chan].num_freq != 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("INTERNAL ERROR, %s:%d, chan=%d, num_freq(%d) != 1\n",
__FILE__, __LINE__, chan, save_audio_config_p->achan[chan].num_freq);
}
for (d = 0; d < save_audio_config_p->achan[chan].num_demod; d++) {
int mark, space;
assert (d >= 0 && d < MAX_SUBCHANS);
struct demodulator_state_s *D;
D = &demodulator_state[chan][d];
profile = save_audio_config_p->achan[chan].profiles[d];
mark = save_audio_config_p->achan[chan].mark_freq;
space = save_audio_config_p->achan[chan].space_freq;
if (save_audio_config_p->achan[chan].num_demod != 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf (" %d.%d: %c %d & %d\n", chan, d, profile, mark, space);
}
demod_afsk_init (save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec / save_audio_config_p->achan[chan].decimate,
save_audio_config_p->achan[chan].baud,
mark,
space,
profile,
D);
/* For siginal level reporting, we want a longer term view. */
// TODO: Should probably move this into the init functions.
D->quick_attack = D->agc_fast_attack * 0.2;
D->sluggish_decay = D->agc_slow_decay * 0.2;
}
}
else if (have_plus) {
/*
* PLUS - which implies we have only one letter and one frequency pair.
*
* One demodulator feeds multiple slicers, each a subchannel.
*/
if (num_letters != 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("INTERNAL ERROR, %s:%d, chan=%d, strlen(\"%s\") != 1\n",
__FILE__, __LINE__, chan, just_letters);
}
if (save_audio_config_p->achan[chan].num_freq != 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("INTERNAL ERROR, %s:%d, chan=%d, num_freq(%d) != 1\n",
__FILE__, __LINE__, chan, save_audio_config_p->achan[chan].num_freq);
}
if (save_audio_config_p->achan[chan].num_demod != save_audio_config_p->achan[chan].num_demod) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("INTERNAL ERROR, %s:%d, chan=%d, num_freq(%d) != num_demod(%d)\n",
__FILE__, __LINE__, chan, save_audio_config_p->achan[chan].num_freq, save_audio_config_p->achan[chan].num_demod);
}
struct demodulator_state_s *D;
D = &demodulator_state[chan][0];
/* I'm not happy about putting this hack here. */
/* This belongs in demod_afsk_init but it doesn't have access to the audio config. */
save_audio_config_p->achan[chan].num_demod = 1;
save_audio_config_p->achan[chan].num_subchan = MAX_SUBCHANS;
demod_afsk_init (save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec / save_audio_config_p->achan[chan].decimate,
save_audio_config_p->achan[chan].baud,
save_audio_config_p->achan[chan].mark_freq,
save_audio_config_p->achan[chan].space_freq,
save_audio_config_p->achan[chan].profiles[0],
D);
/* I'm not happy about putting this hack here. */
/* should pass in as a parameter rather than adding on later. */
D->num_slicers = MAX_SUBCHANS;
/* For siginal level reporting, we want a longer term view. */
D->quick_attack = D->agc_fast_attack * 0.2;
D->sluggish_decay = D->agc_slow_decay * 0.2;
}
else {
int d;
/*
* One letter.
* Can be combined with multiple frequencies.
*/
if (num_letters != 1) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("INTERNAL ERROR, %s:%d, chan=%d, strlen(\"%s\") != 1\n",
__FILE__, __LINE__, chan, save_audio_config_p->achan[chan].profiles);
}
save_audio_config_p->achan[chan].num_demod = save_audio_config_p->achan[chan].num_freq;
save_audio_config_p->achan[chan].num_subchan = save_audio_config_p->achan[chan].num_freq;
for (d = 0; d < save_audio_config_p->achan[chan].num_freq; d++) {
int mark, space, k;
assert (d >= 0 && d < MAX_SUBCHANS);
struct demodulator_state_s *D;
D = &demodulator_state[chan][d];
profile = save_audio_config_p->achan[chan].profiles[0];
k = d * save_audio_config_p->achan[chan].offset - ((save_audio_config_p->achan[chan].num_freq - 1) * save_audio_config_p->achan[chan].offset) / 2;
mark = save_audio_config_p->achan[chan].mark_freq + k;
space = save_audio_config_p->achan[chan].space_freq + k;
if (save_audio_config_p->achan[chan].num_freq != 1) {
text_color_set(DW_COLOR_DEBUG);
dw_printf (" %d.%d: %c %d & %d\n", chan, d, profile, mark, space);
}
demod_afsk_init (save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec / save_audio_config_p->achan[chan].decimate,
save_audio_config_p->achan[chan].baud,
mark, space,
profile,
D);
/* For siginal level reporting, we want a longer term view. */
D->quick_attack = D->agc_fast_attack * 0.2;
D->sluggish_decay = D->agc_slow_decay * 0.2;
} /* for each freq pair */
}
break;
//TODO: how about MODEM_OFF case?
case MODEM_BASEBAND:
case MODEM_SCRAMBLE:
default: /* Not AFSK */
{
if (strcmp(save_audio_config_p->achan[chan].profiles, "") == 0) {
/* Apply default if not set earlier. */
/* Not sure if it should be on for ARM too. */
/* Need to take a look at CPU usage and performance difference. */
#ifndef __arm__
strcpy (save_audio_config_p->achan[chan].profiles, "+");
#endif
}
text_color_set(DW_COLOR_DEBUG);
dw_printf ("Channel %d: %d baud, K9NG/G3RUH, %s, %d sample rate x %d",
chan, save_audio_config_p->achan[chan].baud,
save_audio_config_p->achan[chan].profiles,
save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec, UPSAMPLE);
if (save_audio_config_p->achan[chan].dtmf_decode != DTMF_DECODE_OFF)
dw_printf (", DTMF decoder enabled");
dw_printf (".\n");
struct demodulator_state_s *D;
D = &demodulator_state[chan][0]; // first subchannel
save_audio_config_p->achan[chan].num_subchan = 1;
save_audio_config_p->achan[chan].num_demod = 1;
if (strchr(save_audio_config_p->achan[chan].profiles, '+') != NULL) {
/* I'm not happy about putting this hack here. */
/* This belongs in demod_9600_init but it doesn't have access to the audio config. */
save_audio_config_p->achan[chan].num_demod = 1;
save_audio_config_p->achan[chan].num_subchan = MAX_SUBCHANS;
}
demod_9600_init (UPSAMPLE * save_audio_config_p->adev[ACHAN2ADEV(chan)].samples_per_sec, save_audio_config_p->achan[chan].baud, D);
if (strchr(save_audio_config_p->achan[chan].profiles, '+') != NULL) {
/* I'm not happy about putting this hack here. */
/* should pass in as a parameter rather than adding on later. */
D->num_slicers = MAX_SUBCHANS;
}
/* For siginal level reporting, we want a longer term view. */
D->quick_attack = D->agc_fast_attack * 0.2;
D->sluggish_decay = D->agc_slow_decay * 0.2;
}
break;
} /* switch on modulation type. */
} /* if channel number is valid */
} /* for chan ... */
return (0);
} /* end demod_init */
static void xmit_ax25_frames (int c, int p, packet_t pp)
{
unsigned char fbuf[AX25_MAX_PACKET_LEN+2];
int flen;
char stemp[1024]; /* max size needed? */
int info_len;
unsigned char *pinfo;
int pre_flags, post_flags;
int num_bits; /* Total number of bits in transmission */
/* including all flags and bit stuffing. */
int duration; /* Transmission time in milliseconds. */
int already;
int wait_more;
int maxframe; /* Maximum number of frames for one transmission. */
int numframe; /* Number of frames sent during this transmission. */
/*
* These are for timing of a transmission.
* All are in usual unix time (seconds since 1/1/1970) but higher resolution
*/
double time_ptt; /* Time when PTT is turned on. */
double time_now; /* Current time. */
int nb;
maxframe = (p == TQ_PRIO_0_HI) ? 1 : 7;
/*
* Print trasmitted packet. Prefix by channel and priority.
* Do this before we get into the time critical part.
*/
ax25_format_addrs (pp, stemp);
info_len = ax25_get_info (pp, &pinfo);
text_color_set(DW_COLOR_XMIT);
dw_printf ("[%d%c] ", c, p==TQ_PRIO_0_HI ? 'H' : 'L');
dw_printf ("%s", stemp); /* stations followed by : */
ax25_safe_print ((char *)pinfo, info_len, ! ax25_is_aprs(pp));
dw_printf ("\n");
(void)ax25_check_addresses (pp);
/* Optional hex dump of packet. */
if (g_debug_xmit_packet) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("------\n");
ax25_hex_dump (pp);
dw_printf ("------\n");
}
/*
* Turn on transmitter.
* Start sending leading flag bytes.
*/
time_ptt = dtime_now ();
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: Turn on PTT now for channel %d. speed = %d\n", c, xmit_bits_per_sec[c]);
#endif
ptt_set (OCTYPE_PTT, c, 1);
pre_flags = MS_TO_BITS(xmit_txdelay[c] * 10, c) / 8;
num_bits = hdlc_send_flags (c, pre_flags, 0);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: txdelay=%d [*10], pre_flags=%d, num_bits=%d\n", xmit_txdelay[c], pre_flags, num_bits);
#endif
/*
* Transmit the frame.
*/
flen = ax25_pack (pp, fbuf);
assert (flen >= 1 && flen <= sizeof(fbuf));
nb = hdlc_send_frame (c, fbuf, flen);
num_bits += nb;
numframe = 1;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: flen=%d, nb=%d, num_bits=%d, numframe=%d\n", flen, nb, num_bits, numframe);
#endif
ax25_delete (pp);
/*
* Additional packets if available and not exceeding max.
*/
while (numframe < maxframe && tq_count (c,p) > 0) {
pp = tq_remove (c, p);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: tq_remove(chan=%d, prio=%d) returned %p\n", c, p, pp);
#endif
ax25_format_addrs (pp, stemp);
info_len = ax25_get_info (pp, &pinfo);
text_color_set(DW_COLOR_XMIT);
dw_printf ("[%d%c] ", c, p==TQ_PRIO_0_HI ? 'H' : 'L');
dw_printf ("%s", stemp); /* stations followed by : */
ax25_safe_print ((char *)pinfo, info_len, ! ax25_is_aprs(pp));
dw_printf ("\n");
(void)ax25_check_addresses (pp);
if (g_debug_xmit_packet) {
text_color_set(DW_COLOR_DEBUG);
dw_printf ("------\n");
ax25_hex_dump (pp);
dw_printf ("------\n");
}
/*
* Transmit the frame.
*/
flen = ax25_pack (pp, fbuf);
assert (flen >= 1 && flen <= sizeof(fbuf));
nb = hdlc_send_frame (c, fbuf, flen);
num_bits += nb;
numframe++;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: flen=%d, nb=%d, num_bits=%d, numframe=%d\n", flen, nb, num_bits, numframe);
#endif
ax25_delete (pp);
}
/*
* Need TXTAIL because we don't know exactly when the sound is done.
*/
post_flags = MS_TO_BITS(xmit_txtail[c] * 10, c) / 8;
nb = hdlc_send_flags (c, post_flags, 1);
num_bits += nb;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: txtail=%d [*10], post_flags=%d, nb=%d, num_bits=%d\n", xmit_txtail[c], post_flags, nb, num_bits);
#endif
/*
* While demodulating is CPU intensive, generating the tones is not.
* Example: on the RPi, with 50% of the CPU taken with two receive
* channels, a transmission of more than a second is generated in
* about 40 mS of elapsed real time.
*/
audio_wait(ACHAN2ADEV(c));
/*
* Ideally we should be here just about the time when the audio is ending.
* However, the innards of "audio_wait" are not satisfactory in all cases.
*
* Calculate how long the frame(s) should take in milliseconds.
*/
duration = BITS_TO_MS(num_bits, c);
/*
* See how long it has been since PTT was turned on.
* Wait additional time if necessary.
*/
time_now = dtime_now();
already = (int) ((time_now - time_ptt) * 1000.);
wait_more = duration - already;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: xmit duration=%d, %d already elapsed since PTT, wait %d more\n", duration, already, wait_more );
#endif
if (wait_more > 0) {
SLEEP_MS(wait_more);
}
else if (wait_more < -100) {
/* If we run over by 10 mSec or so, it's nothing to worry about. */
/* However, if PTT is still on about 1/10 sec after audio */
/* should be done, something is wrong. */
/* Looks like a bug with the RPi audio system. Never an issue with Ubuntu. */
/* This runs over randomly sometimes. TODO: investigate more fully sometime. */
#ifndef __arm__
text_color_set(DW_COLOR_ERROR);
dw_printf ("Transmit timing error: PTT is on %d mSec too long.\n", -wait_more);
#endif
}
/*
* Turn off transmitter.
*/
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
time_now = dtime_now();
dw_printf ("xmit_thread: Turn off PTT now. Actual time on was %d mS, vs. %d desired\n", (int) ((time_now - time_ptt) * 1000.), duration);
#endif
ptt_set (OCTYPE_PTT, c, 0);
} /* end xmit_ax25_frames */
static int wait_for_clear_channel (int channel, int nowait, int slottime, int persist)
{
int r;
int n;
n = 0;
start_over_again:
while (hdlc_rec_data_detect_any(channel)) {
SLEEP_MS(WAIT_CHECK_EVERY_MS);
n++;
if (n > (WAIT_TIMEOUT_MS / WAIT_CHECK_EVERY_MS)) {
return 0;
}
}
//TODO1.2: rethink dwait.
/*
* Added in version 1.2 - for transceivers that can't
* turn around fast enough when using squelch and VOX.
*/
if (save_audio_config_p->achan[channel].dwait > 0) {
SLEEP_MS (save_audio_config_p->achan[channel].dwait * 10);
}
if (hdlc_rec_data_detect_any(channel)) {
goto start_over_again;
}
if ( ! nowait) {
while (1) {
SLEEP_MS (slottime * 10);
if (hdlc_rec_data_detect_any(channel)) {
goto start_over_again;
}
r = rand() & 0xff;
if (r <= persist) {
break;
}
}
}
// TODO1.2
while ( ! dw_mutex_try_lock(&(audio_out_dev_mutex[ACHAN2ADEV(channel)]))) {
SLEEP_MS(WAIT_CHECK_EVERY_MS);
n++;
if (n > (WAIT_TIMEOUT_MS / WAIT_CHECK_EVERY_MS)) {
return 0;
}
}
return 1;
} /* end wait_for_clear_channel */
static void * xmit_thread (void *arg)
#endif
{
int c = (int)(long)arg; // channel number.
packet_t pp;
int p;
int ok;
/*
* These are for timing of a transmission.
* All are in usual unix time (seconds since 1/1/1970) but higher resolution
*/
while (1) {
tq_wait_while_empty (c);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread, channel %d: woke up\n", c);
#endif
for (p=0; p<TQ_NUM_PRIO; p++) {
pp = tq_remove (c, p);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("xmit_thread: tq_remove(chan=%d, prio=%d) returned %p\n", c, p, pp);
#endif
if (pp != NULL) {
/*
* Wait for the channel to be clear.
* For the high priority queue, begin transmitting immediately.
* For the low priority queue, wait a random amount of time, in hopes
* of minimizing collisions.
*/
ok = wait_for_clear_channel (c, (p==TQ_PRIO_0_HI), xmit_slottime[c], xmit_persist[c]);
if (ok) {
/*
* Channel is clear and we have lock on output device.
*
* If destination is "SPEECH" send info part to speech synthesizer.
* If destination is "MORSE" send as morse code.
*/
char dest[AX25_MAX_ADDR_LEN];
int ssid = 0;
if (ax25_is_aprs (pp)) {
ax25_get_addr_no_ssid(pp, AX25_DESTINATION, dest);
ssid = ax25_get_ssid(pp, AX25_DESTINATION);
}
else {
strlcpy (dest, "", sizeof(dest));
}
if (strcmp(dest, "SPEECH") == 0) {
xmit_speech (c, pp);
}
else if (strcmp(dest, "MORSE") == 0) {
int wpm = ssid * 2;
if (wpm == 0) wpm = MORSE_DEFAULT_WPM;
// This is a bit of a hack so we don't respond too quickly for APRStt.
// It will be sent in high priority queue while a beacon wouldn't.
// Add a little delay so user has time release PTT after sending #.
// This and default txdelay would give us a second.
if (p == TQ_PRIO_0_HI) {
//text_color_set(DW_COLOR_DEBUG);
//dw_printf ("APRStt morse xmit delay hack...\n");
SLEEP_MS (700);
}
xmit_morse (c, pp, wpm);
}
else {
xmit_ax25_frames (c, p, pp);
}
dw_mutex_unlock (&(audio_out_dev_mutex[ACHAN2ADEV(c)]));
}
else {
/*
* Timeout waiting for clear channel.
* Discard the packet.
* Display with ERROR color rather than XMIT color.
*/
char stemp[1024]; /* max size needed? */
int info_len;
unsigned char *pinfo;
text_color_set(DW_COLOR_ERROR);
dw_printf ("Waited too long for clear channel. Discarding packet below.\n");
ax25_format_addrs (pp, stemp);
info_len = ax25_get_info (pp, &pinfo);
text_color_set(DW_COLOR_INFO);
dw_printf ("[%d%c] ", c, p==TQ_PRIO_0_HI ? 'H' : 'L');
dw_printf ("%s", stemp); /* stations followed by : */
ax25_safe_print ((char *)pinfo, info_len, ! ax25_is_aprs(pp));
dw_printf ("\n");
ax25_delete (pp);
} /* wait for clear channel. */
} /* for high priority then low priority */
}
}
return 0; /* unreachable but quiet the warning. */
} /* end xmit_thread */