Workaround for 300 bps receive

codec2talkie/src/main/java/com/radio/codec2talkie/protocol/Aprs.java

@@ -143,7 +143,6 @@ public class Aprs implements Protocol {
             if (data.length == 0) return;
             AprsDataType dataType = new AprsDataType((char)data[0]);
             AprsData aprsData = AprsDataFactory.fromBinary(src, dst, data);
-            Log.i(TAG, "onReceiveData() " + aprsData.isValid() + " " + dataType.getDataType() + " " + src + " " + dst);
             if (aprsData != null && aprsData.isValid()) {
                 if (dataType.isTextMessage()) {
                     TextMessage textMessage = aprsData.toTextMessage();

codec2talkie/src/main/java/com/radio/codec2talkie/transport/SoundModem.java

@@ -60,7 +60,8 @@ public class SoundModem implements Transport, Runnable {
         String type = _sharedPreferences.getString(PreferenceKeys.PORTS_SOUND_MODEM_TYPE, "1200");
         _name = "SoundModem" + type;
         if (type.equals("300")) {
-            _fskModem = Codec2.fskCreate(SAMPLE_RATE, 300, 1600, 200);
+            // XXX, use 230 tone spacing, <230 spacing for 300 bps does not work with codec2 fsk for receive
+            _fskModem = Codec2.fskCreate(SAMPLE_RATE, 300, 1600, disableRx ? 200 : 230);
         } else {
             _fskModem = Codec2.fskCreate(SAMPLE_RATE, 1200, 1200, 1000);
         }

libcodec2-android/src/codec2/src/fsk.c

@@ -487,7 +487,7 @@ void fsk_demod_freq_est(struct FSK *fsk, COMP fsk_in[], float *freqs, int M) {
             #ifdef USE_HANN_TABLE
             hann = fsk->hann_table[i];
             #else
-            hann = 0.5 - 0.5 * cosf(2.0 * M_PI * (float)i / (float) (fft_samps-1));
+            hann = 0.5 - 0.5 * cosf(2.0 * M_PI * (float)i / (float) (Ndft-1));
             #endif
             fftin[i].r = hann*fsk_in[i+a].real;
             fftin[i].i = hann*fsk_in[i+a].imag;