uint8_t udp_send( uint16_t len ){
DEBUG_FUNC_ENTER();
uint16_t udp_check_sum;
uint8_t ret;
/* fill ip header */
buff.ip.total_len = UDP_HEADER_OFFSET + buff.udp.len;
buff.ip.identification = 0;
buff.ip.protocal = IP_PROTOCAL_UDP;
/* fill udp */
len += 8;
buff.udp.len = len;
/* Checksum of UDP */
buff.udp.checksum = 0;
udp_check_sum = checksum( 0, buff.bytes+UDP_HEADER_OFFSET, len );
udp_check_sum = checksum( 0, buff.ip.src_addr, 8 );
udp_check_sum = checksum_add( udp_check_sum, len );
udp_check_sum = checksum_add( udp_check_sum, IP_PROTOCAL_UDP );
buff.udp.checksum = udp_check_sum;
ret = sendIPPacket( );
DEBUG_FUNC_EXIT();
return ret;
}
static inline void decoder_newdata( uint16_t period )
{
uint8_t sym;
/* Check that the frequency reaches the minimum */
if( period < (period_lut[0] - RANGE) ) {
decoder_reset();
return;
}
for( sym=0;
sym < NFREQ;
sym++ )
if( period < (period_lut[sym] + RANGE) )
break;
if( sym == NFREQ ) {
/* Invalid frequency - reset the decoder */
decoder_reset();
return;
}
/* Ignore repeated symbols */
if( sym == last_sym )
return;
/*** Decode the symbol ***/
if( sym == 0 ) {
cb_pos = 0;
curbyte = 0;
last_sym = 0;
return;
}
/* Remove the step over the last symbol */
if( sym > last_sym ) {
last_sym = sym;
sym--;
} else
last_sym = sym;
/* Start of the byte? */
sym--;
curbyte |= sym << (cb_pos * NBITS);
cb_pos++;
if( cb_pos == SYMBOLS_PER_BYTE ) {
static uint8_t checksum;
static bool escaped = FALSE;
/* We now have a full byte */
cb_pos = 0;
if( curbyte == 0x7e ) {
/* Start of frame */
d_pos = 0;
checksum = 0;
data[0] = 0x7e;
escaped = FALSE;
} else if( data[0] == 0x7e ) {
if( curbyte == 0x7d ) {
escaped = TRUE;
return;
}
else if( escaped ) {
curbyte ^= 0x20;
escaped = FALSE;
}
data[d_pos] = curbyte;
/* data[1] is the length if we've got that far */
if( d_pos > 1 && d_pos == (data[1] + 2) ) {
/* Frame reception complete -- check the checksum */
if( checksum == curbyte )
net_rx_proc_incoming( data+2, data[1] );
}
else
checksum_add( checksum, curbyte );
}
if( data[0] == 0x7e )
d_pos = (d_pos==(DATA_LEN-1))?0:(d_pos+1);
}
}