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start documenting this code.
On passing, fix the bogus datalen on outgoing frames just fixed in 1.4 rev.48583 git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48588 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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@@ -80,6 +80,12 @@ static char *descrip =
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"smsq (a separate software) is a command to generate message\n"
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"queues and send messages.\n";
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/*
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* 80 samples of a single period of the wave. At 8000 Hz, it means these
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* are the samples of a 100 Hz signal.
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* To pick the two carriers (1300Hz for '1' and 2100 Hz for '0') used by
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* the modulation, we should take one every 13 and 21 samples respectively.
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*/
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static signed short wave[] = {
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0, 392, 782, 1167, 1545, 1913, 2270, 2612, 2939, 3247, 3536, 3802, 4045, 4263, 4455, 4619, 4755, 4862, 4938, 4985,
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5000, 4985, 4938, 4862, 4755, 4619, 4455, 4263, 4045, 3802, 3536, 3247, 2939, 2612, 2270, 1913, 1545, 1167, 782, 392,
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@@ -168,11 +174,11 @@ typedef struct sms_s
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unsigned char iphasep; /*!< bit phase (0-79) for 1200 bps */
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unsigned char ibitn; /*!< bit number in byte being received */
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unsigned char ibytev; /*!< byte value being received */
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unsigned char ibytep; /*!< byte pointer in messafe */
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unsigned char ibytep; /*!< byte pointer in message */
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unsigned char ibytec; /*!< byte checksum for message */
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unsigned char ierr; /*!< error flag */
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unsigned char ibith; /*!< history of last bits */
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unsigned char ibitt; /* total of 1's in last 3 bites */
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unsigned char ibitt; /*!< total of 1's in last 3 bytes */
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/* more to go here */
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} sms_t;
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@@ -1105,7 +1111,7 @@ static void sms_messagerx(sms_t * h)
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{
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sms_debug ("RX", h->imsg);
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/* testing */
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switch (h->imsg[0]) {
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switch (h->imsg[0]) { /* PROTOCOL version 1 */
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case 0x91: /* SMS_DATA */
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{
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unsigned char cause = sms_handleincoming (h);
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@@ -1157,18 +1163,21 @@ static void sms_messagerx(sms_t * h)
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static void sms_messagetx(sms_t * h)
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{
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unsigned char c = 0, p;
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for (p = 0; p < h->omsg[1] + 2; p++)
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int len = h->omsg[1] + 2; /* total message length excluding checksum */
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for (p = 0; p < len; p++) /* compute checksum */
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c += h->omsg[p];
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h->omsg[h->omsg[1] + 2] = 0 - c;
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h->omsg[len] = 0 - c; /* actually, (256 - (c & 0fxx)) & 0xff) */
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sms_debug ("TX", h->omsg);
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h->obyte = 1;
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h->opause = 200;
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if (h->omsg[0] == 0x93)
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h->opause = 2400; /* initial message delay 300ms (for BT) */
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h->opause = 2400; /* initial message delay 300ms (for BT) */
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h->obytep = 0;
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h->obitp = 0;
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h->osync = 80;
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h->obyten = h->omsg[1] + 3;
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/* Note - setting osync triggers the generator */
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h->osync = 80; /* 80 sync bits */
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h->obyten = len + 1; /* bytes to send (including checksum) */
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}
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static int sms_generate (struct ast_channel *chan, void *data, int len, int samples)
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@@ -1198,7 +1207,7 @@ static int sms_generate (struct ast_channel *chan, void *data, int len, int samp
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#else
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f.subclass = AST_FORMAT_SLINEAR;
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#endif
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f.datalen = len;
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f.datalen = samples * SAMPLE2LEN;
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f.offset = AST_FRIENDLY_OFFSET;
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f.mallocd = 0;
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f.data = buf;
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@@ -1490,8 +1499,16 @@ static int sms_exec (struct ast_channel *chan, void *data)
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}
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/* Do our thing here */
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while (ast_waitfor (chan, -1) > -1 && !h.hangup)
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{
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for (;;) {
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int i = ast_waitfor(chan, -1);
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if (i < 0) {
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ast_log(LOG_NOTICE, "waitfor failed\n");
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break;
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}
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if (h.hangup) {
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ast_log(LOG_NOTICE, "channel hangup\n");
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break;
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}
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f = ast_read (chan);
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if (!f)
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break;
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