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gr-satnogs
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Finished the FSK frame acquisition.

This commit is contained in:
Manolis Surligas 2016-04-05 21:29:23 +03:00
parent bb57d63517
commit 4b3b08f200
2 changed files with 54 additions and 3 deletions
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56
lib/upsat_fsk_frame_acquisition_impl.cc
View File

@ -95,6 +95,7 @@ namespace gr
{
d_state = SEARCHING;
d_decoded_bytes = 0;
d_decoded_bits = 0;
d_shifting_byte = 0;
}
@ -109,18 +110,24 @@ namespace gr
upsat_fsk_frame_acquisition_impl::have_sync ()
{
d_state = HAVE_SYNC_WORD;
d_decoded_bytes = 0;
d_decoded_bits = 0;
}
inline void
upsat_fsk_frame_acquisition_impl::have_frame_len ()
{
d_state = HAVE_FRAME_LEN;
d_decoded_bytes = 0;
d_decoded_bits = 0;
}
inline void
upsat_fsk_frame_acquisition_impl::have_payload ()
{
d_state = HAVE_PAYLOAD;
d_decoded_bytes = 0;
d_decoded_bits = 0;
}
int
@ -132,6 +139,7 @@ namespace gr
const float *in = (const float *) input_items[0];
for (i = 0; i < noutput_items; i++) {
slice_and_shift (in[i]);
switch (d_state)
{
case SEARCHING:
@ -140,13 +148,55 @@ namespace gr
}
break;
case HAVE_PREAMBLE:
d_decoded_bits++;
if(d_decoded_bits == 8) {
d_decoded_bits = 0;
if(d_shifting_byte == d_preamble[d_decoded_bytes]){
d_decoded_bytes++;
if(d_decoded_bytes == d_preamble_len){
/* End of the preamble. It's time for the sync word */
have_sync();
}
}
else{
/* Reset the preamble detection */
reset_state();
}
}
break;
case HAVE_SYNC_WORD:
d_decoded_bits++;
if(d_decoded_bits == 8) {
d_decoded_bits = 0;
if(d_shifting_byte == d_sync_word[d_decoded_bytes]) {
d_decoded_bytes++;
if(d_decoded_bytes == d_sync_word_len){
have_frame_len();
}
}
else{
reset_state();
}
}
break;
case HAVE_FRAME_LEN:
d_decoded_bits++;
if(d_decoded_bits == 8) {
d_frame_len = d_decoded_bytes;
have_payload();
}
break;
case HAVE_PAYLOAD:
if (d_decoded_bytes == d_frame_len) {
message_port_pub (pmt::mp ("pdu"),
pmt::make_blob (d_pdu, d_frame_len));
d_decoded_bits++;
if (d_decoded_bits == 8) {
d_decoded_bits = 0;
d_pdu[d_decoded_bytes] = d_shifting_byte;
if (d_decoded_bytes == d_frame_len) {
message_port_pub (pmt::mp ("pdu"),
pmt::make_blob (d_pdu, d_frame_len));
reset_state ();
}
}
break;
default:

1
lib/upsat_fsk_frame_acquisition_impl.h
View File

@ -52,6 +52,7 @@ namespace gr
decoding_state_t d_state;
uint8_t d_shifting_byte;
size_t d_decoded_bytes;
size_t d_decoded_bits;
size_t d_frame_len;
uint8_t *d_pdu;