enable L1_NEW_AEC in l1_confg.h (bold change) The AEC function implemented in DSP ROM 3606 on the Calypso silicon we work with is the one that corresponds to L1_NEW_AEC; the same holds for DSP 34 and even for DSP 33 with more recent patch versions. However, TI shipped their TCS211 reference fw with L1_NEW_AEC set to 0, thus driving AEC the old way if anyone tried to enable it, either via AT%Nxxxx or via the audio mode facility. As a result, the fw would try to control features which no longer exist in the DSP (long vs short echo and the old echo suppression level bits), while providing no way to tune the 8 new parameter words added to the DSP's NDB page. The only sensible solution is to bite the bullet and enable L1_NEW_AEC in L1 config, with fallout propagating into RiViera Audio Service T_AUDIO_AEC_CFG structure and into /aud/*.cfg binary file format. The latter fallout will be addressed in further code changes.

/************* Revision Controle System Header *************
 *                  GSM Layer 1 software 
 * L1GTT_MSGTY.H
 *
 *        Filename l1gtt_msgty.h
 *  Copyright 2003 (C) Texas Instruments  
 *
 ************* Revision Controle System Header *************/

#if (L1_GTT == 1)

typedef struct
{
  UWORD8 loop_type;  // Type of loop to be closed
}
T_TST_CLOSE_GTT_LOOP_REQ;

typedef struct
{
  UWORD8  scen_type;  // 1 = input on CTM Tx, 2 = input on Baudot encoder
                      // SIMULATION ONLY: 3 = input on CTM Rx, 4 = input on Baudot decoder
  UWORD16 rate;       // Number of frames (4.615 ms) between each new character arrival
                      // for scen_type 3 and 4: GTT input file number
}
T_TST_START_GTT_TEST_REQ;

#endif // L1_GTT