FreeCalypso > hg > fc-tourmaline
view src/cs/layer1/gtt_include/ctm/tonedemod.h @ 303:f76436d19a7a default tip
!GPRS config: fix long-standing AT+COPS chance hanging bug
There has been a long-standing bug in FreeCalypso going back years:
sometimes in the AT command bring-up sequence of an ACI-only MS,
the AT+COPS command would produce only a power scan followed by
cessation of protocol stack activity (only L1 ADC traces), instead
of the expected network search sequence. This behaviour was seen
in different FC firmware versions going back to Citrine, and seemed
to follow some law of chance, not reliably repeatable.
This bug has been tracked down and found to be specific to !GPRS
configuration, stemming from our TCS2/TCS3 hybrid and reconstruction
of !GPRS support that was bitrotten in TCS3.2/LoCosto version.
ACI module psa_mms.c, needed only for !GPRS, was missing in the TCS3
version and had to be pulled from TCS2 - but as it turns out,
there is a new field in the MMR_REG_REQ primitive that needs to be
set correctly, and that psa_mms.c module is the place where this
initialization needed to be added.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 08 Jun 2023 08:23:37 +0000 |
parents | 4e78acac3d88 |
children |
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/* ******************************************************************************* * * COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH * 90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100 * * The program(s) may be used and/or copied only with the * written permission from Ericsson or in accordance * with the terms and conditions stipulated in the agreement or * contract under which the program(s) have been supplied. * ******************************************************************************* * * File : tonedemod.h * Purpose : Demodulator for the Cellular Text Telephone Modem * 1-out-of-4 tones (400, 600, 800, 1000 Hz) * for the coding of each pair of two adjacent bits * * Definition of the type demod_state_t and of the * functions init_tonedemod() and tonedemod() * ******************************************************************************* */ #ifndef tonedemod_h #define tonedemod_h "$Id: $" /* ******************************************************************************* * INCLUDE FILES ******************************************************************************* */ #include "ctm_defines.h" /* ******************************************************************************* * DECLARATION OF PROTOTYPES ******************************************************************************* */ typedef struct { WORD16 buffer_tone_rx[3*SYMB_LEN]; WORD16 xcorr_t0[2*SYMB_LEN]; WORD16 xcorr_t1[2*SYMB_LEN]; WORD16 xcorr_t2[2*SYMB_LEN]; WORD16 xcorr_t3[2*SYMB_LEN]; WORD16 xcorr_wb[2*SYMB_LEN]; WORD16 lowpass[SYMB_LEN]; WORD16 waveform_t0[SYMB_LEN]; WORD16 waveform_t1[SYMB_LEN]; WORD16 waveform_t2[SYMB_LEN]; WORD16 waveform_t3[SYMB_LEN]; WORD16 diff_smooth[SYMB_LEN]; } demod_state_t; /* ----------------------------------------------------------------------- */ /* FUNCTION tonedemod() */ /* ******************** */ /* Tone Demodulator for the Cellular Text Telephone Modem */ /* using one out of four tones for coding two bits in parallel within a */ /* frame of 40 samples (5 ms). */ /* */ /* The function has to be called for every frame of 40 samples of the */ /* received tone sequence. However, in order to track a non-ideal */ /* of the transmitter's and the receiver's clock frequencies, one frame */ /* might be shorter (only 39 samples) or longer (41 samples). The */ /* of the following frame is indicated by the variable */ /* *sampling_correction, which is calculated and returned by this function.*/ /* */ /* input variables: */ /* bits_out contains the 39, 40 or 41 actual samples of the */ /* received tones; the bits are soft bits, i.e. they */ /* are in the range between -1.0 and 1.0, where the */ /* magnitude serves as reliability information */ /* num_in_samples number of valid samples in bits_out */ /* */ /* output variables: */ /* bits_out contains the two actual decoded soft bits */ /* sampling_correction is either -1, 0, or 1 and indicates whether the */ /* next frame shall contain 39, 40, or 41 samples */ /* demod_state contains all the memory of tonedemod. Must be */ /* initialized using the function init_tonedemod() */ /* ----------------------------------------------------------------------- */ void tonedemod(WORD16 *bits_out, WORD16 *rx_tone_vec, WORD16 num_in_samples, WORD16 *ptr_sampling_correction, demod_state_t *demod_state); /* ----------------------------------------------------------------------- */ /* FUNCTION init_tonedemod() */ /* ************************* */ /* Initialization of one instance of the Tone Demodulator. The argument */ /* must contain a pointer to a variable of type demod_state_t, which */ /* contains all the memory of the tone demodulator. Each instance of */ /* tonedemod must have its own variable. */ /* ----------------------------------------------------------------------- */ void init_tonedemod(demod_state_t *demod_state); #endif