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M17 - Do not include Data Type Byte in PKT CRC;

This commit is contained in:
lwvmobile 2024-03-12 17:48:58 -04:00
parent 114d8d7dfc
commit 296775d231
1 changed files with 2 additions and 2 deletions
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4
src/m17.c
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@ -2527,7 +2527,7 @@ void encodeM17PKT(dsd_opts * opts, dsd_state * state)
if (m17_p1_packed[x] == 0) break; //stop at the termination byte
x++;
}
crc_cmp = crc16m17(m17_p1_packed, x);
crc_cmp = crc16m17(m17_p1_packed+1, x-1);
//debug dump CRC (when pad is literally zero)
fprintf (stderr, " X: %d; LAST: %02X; TERM: %02X; CRC: %04X", x, m17_p1_packed[x-1], m17_p1_packed[x], crc_cmp);
@ -2823,7 +2823,7 @@ void processM17PKT(dsd_opts * opts, dsd_state * state)
if (eot)
{
//do a CRC check
uint16_t crc_cmp = crc16m17(state->m17_pkt, total);
uint16_t crc_cmp = crc16m17(state->m17_pkt+1, total-1);
uint16_t crc_ext = (state->m17_pkt[end-2] << 8) + state->m17_pkt[end-1];
if (crc_cmp == crc_ext)