Git-Mirrors/OpenModem
1
0
Fork 0
mirror of https://github.com/markqvist/OpenModem.git synced 2024-10-01 03:15:46 -04:00
Code Issues Actions Packages Projects Releases Wiki Activity

Reworked HDLC struct

Browse Source
This commit is contained in:
Mark Qvist 2014-04-03 23:25:22 +02:00
parent e76216875e
commit e84705e5e1
3 changed files with 28 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
Modem/afsk.c
View File

@ -66,73 +66,73 @@ static bool hdlcParse(Hdlc *hdlc, bool bit, FIFOBuffer *fifo)
{ {
bool ret = true; bool ret = true;
hdlc->demod_bits <<= 1; hdlc->demodulatedBits <<= 1;
hdlc->demod_bits |= bit ? 1 : 0; hdlc->demodulatedBits |= bit ? 1 : 0;
/* HDLC Flag */ /* HDLC Flag */
if (hdlc->demod_bits == HDLC_FLAG) if (hdlc->demodulatedBits == HDLC_FLAG)
{ {
if (!fifo_isfull(fifo)) if (!fifo_isfull(fifo))
{ {
fifo_push(fifo, HDLC_FLAG); fifo_push(fifo, HDLC_FLAG);
hdlc->rxstart = true; hdlc->receiving = true;
} }
else else
{ {
ret = false; ret = false;
hdlc->rxstart = false; hdlc->receiving = false;
} }
hdlc->currchar = 0; hdlc->currentByte = 0;
hdlc->bit_idx = 0; hdlc->bitIndex = 0;
return ret; return ret;
} }
/* Reset */ /* Reset */
if ((hdlc->demod_bits & HDLC_RESET) == HDLC_RESET) if ((hdlc->demodulatedBits & HDLC_RESET) == HDLC_RESET)
{ {
hdlc->rxstart = false; hdlc->receiving = false;
return ret; return ret;
} }
if (!hdlc->rxstart) if (!hdlc->receiving)
return ret; return ret;
/* Stuffed bit */ /* Stuffed bit */
if ((hdlc->demod_bits & 0x3f) == 0x3e) if ((hdlc->demodulatedBits & 0x3f) == 0x3e)
return ret; return ret;
if (hdlc->demod_bits & 0x01) if (hdlc->demodulatedBits & 0x01)
hdlc->currchar |= 0x80; hdlc->currentByte |= 0x80;
if (++hdlc->bit_idx >= 8) if (++hdlc->bitIndex >= 8)
{ {
if ((hdlc->currchar == HDLC_FLAG if ((hdlc->currentByte == HDLC_FLAG
|| hdlc->currchar == HDLC_RESET || hdlc->currentByte == HDLC_RESET
|| hdlc->currchar == AX25_ESC)) || hdlc->currentByte == AX25_ESC))
{ {
if (!fifo_isfull(fifo)) if (!fifo_isfull(fifo))
fifo_push(fifo, AX25_ESC); fifo_push(fifo, AX25_ESC);
else else
{ {
hdlc->rxstart = false; hdlc->receiving = false;
ret = false; ret = false;
} }
} }
if (!fifo_isfull(fifo)) if (!fifo_isfull(fifo))
fifo_push(fifo, hdlc->currchar); fifo_push(fifo, hdlc->currentByte);
else else
{ {
hdlc->rxstart = false; hdlc->receiving = false;
ret = false; ret = false;
} }
hdlc->currchar = 0; hdlc->currentByte = 0;
hdlc->bit_idx = 0; hdlc->bitIndex = 0;
} }
else else
hdlc->currchar >>= 1; hdlc->currentByte >>= 1;
return ret; return ret;
} }

8
Modem/afsk.h
View File

@ -16,10 +16,10 @@
typedef struct Hdlc typedef struct Hdlc
{ {
uint8_t demod_bits; ///< Bitstream from the demodulator. uint8_t demodulatedBits; // Incoming bitstream from demodulator
uint8_t bit_idx; ///< Current received bit. uint8_t bitIndex; // The current received bit in the current received byte
uint8_t currchar; ///< Current received character. uint8_t currentByte; // The byte we're currently receiving
bool rxstart; ///< True if an HDLC_FLAG char has been found in the bitstream. bool receiving; // Whether or not where actually receiving data (or just noise ;P)
} Hdlc; } Hdlc;
#define AFSK_RXFIFO_OVERRUN BV(0) #define AFSK_RXFIFO_OVERRUN BV(0)

2
buildrev.h
View File

@ -1,2 +1,2 @@
#define VERS_BUILD 49 #define VERS_BUILD 51
#define VERS_HOST "vixen" #define VERS_HOST "vixen"