void bmac_nw_task ()
{
int8_t v;
int8_t e;
uint8_t backoff;
nrk_sig_mask_t event;
while(bmac_started()==0) nrk_wait_until_next_period();
//register the signal after bmac_init has been called
v=nrk_signal_register(bmac_enable_signal);
if(v==NRK_ERROR) nrk_kprintf( PSTR("Failed to register signal\r\n"));
backoff=0;
while (1) {
#ifdef NRK_SW_WDT
#ifdef BMAC_SW_WDT_ID
nrk_sw_wdt_update(BMAC_SW_WDT_ID);
#endif
#endif
if(is_enabled ) {
v=1;
if(rx_buf_empty==1) v=_bmac_channel_check();
// If the buffer is full, signal the receiving task again.
else e=nrk_event_signal (bmac_rx_pkt_signal);
// bmac_channel check turns on radio, don't turn off if
// data is coming.
if(v==0)
{
if(_bmac_rx()==1)
{
e=nrk_event_signal (bmac_rx_pkt_signal);
//if(e==NRK_ERROR) {
// nrk_kprintf( PSTR("bmac rx pkt signal failed\r\n"));
// printf( "errno: %u \r\n",nrk_errno_get() );
//}
}
//else nrk_kprintf( PSTR("Pkt failed, buf could be corrupt\r\n" ));
}
if(/*rx_buf_empty==1 &&*/ tx_data_ready==1)
{
rf_rx_off();
_bmac_tx();
}
//do {
nrk_wait(_bmac_check_period);
// if(rx_buf_empty!=1) nrk_event_signal (bmac_rx_pkt_signal);
//} while(rx_buf_empty!=1);
} else {
event=0;
do {
v=nrk_signal_register(bmac_enable_signal);
event=nrk_event_wait (SIG(bmac_enable_signal));
} while((event & SIG(bmac_enable_signal))==0);
}
//nrk_wait_until_next_period();
}
}
int8_t _bmac_tx()
{
uint8_t v,backoff, backoff_count;
uint16_t b;
#ifdef DEBUG
nrk_kprintf( PSTR("_bmac_tx()\r\n"));
#endif
if(cca_active)
{
// Add random time here to stop nodes from synchronizing with eachother
b=_nrk_time_to_ticks(&_bmac_check_period);
b=b/((rand()%10)+1);
//printf( "waiting %d\r\n",b );
nrk_wait_until_ticks(b);
//nrk_wait_ticks(b);
backoff_count=1;
do{
v=_bmac_channel_check();
rf_rx_off();
if(v==1) break;
// Channel is busy
backoff=rand()%(_b_pow(backoff_count));
#ifdef DEBUG
printf( "backoff %d\r\n",backoff );
#endif
// printf( "backoff %d\r\n",backoff );
nrk_wait_until_next_n_periods(backoff);
backoff_count++;
if(backoff_count>6) backoff_count=6; // cap it at 64
b=_nrk_time_to_ticks(&_bmac_check_period);
b=b/((rand()%10)+1);
// printf( "waiting %d\r\n",b );
nrk_wait_until_ticks(b);
// nrk_wait_ticks(b);
} while(v==0);
}
rf_test_mode();
rf_carrier_on();
nrk_wait(_bmac_check_period);
//nrk_wait_until_next_period();
rf_carrier_off();
rf_data_mode();
// send packet
rf_rx_off();
pkt_got_ack=rf_tx_packet (&bmac_rfTxInfo);
rf_rx_off();
tx_data_ready=0;
nrk_event_signal (bmac_tx_pkt_done_signal);
return NRK_OK;
}
void bmac_nw_task()
{
int8_t v;
int8_t e;
uint8_t backoff;
nrk_sig_mask_t event;
while(bmac_started() == 0) {
nrk_wait_until_next_period();
}
while(1) {
if(is_enabled)
{
v = 1;
rf_rx_on();
if(rx_buf_empty) {
v = _bmac_channel_check();
} else {
e = nrk_event_signal(bmac_rx_pkt_signal); // Mb
// Should signal user task here as a "reminder"
}
if(v == 0) {
// Channel detected as busy, attept to Rx
_bmac_rx();
// Should signal user task here to notify of Rx
}
else if(tx_data_ready) {
// Only try to Tx if the channel is free
rf_rx_off(); // Mb
_bmac_tx();
}
//rf_rx_off(); // Mb
nrk_wait(_bmac_check_period);
}
else
{
event =0;
do
{
v = nrk_signal_register(bmac_enable_signal);
event = nrk_event_wait(SIG(bmac_enable_signal));
}
while((event & SIG(bmac_enable_signal))==0);
}
}
}
int8_t _bmac_tx()
{
uint8_t v,result, backoff, backoff_count;
uint16_t b;
if(cca_active) {
// Add random time here to stop nodes from synchronizing with eachother
b=_nrk_time_to_ticks(&_bmac_check_period);
b=b/((rand()%10)+1);
//printf( "waiting %d\r\n",b );
nrk_wait_until_ticks(b);
//nrk_wait_ticks(b);
backoff_count=1;
do
{
v=_bmac_channel_check();
rf_rx_off();
if(v==1) break;
// Channel is busy
backoff=rand()%(_b_pow(backoff_count));
// printf( "backoff %d\r\n",backoff );
nrk_wait_until_next_n_periods(backoff);
backoff_count++;
if(backoff_count>6) backoff_count=6; // cap it at 64
b=_nrk_time_to_ticks(&_bmac_check_period);
b=b/((rand()%10)+1);
// printf( "waiting %d\r\n",b );
nrk_wait_until_ticks(b);
// nrk_wait_ticks(b);
}
while(v==0);
}
// Give check_period worth of channel activity
rf_test_mode();
rf_carrier_on();
nrk_wait(_bmac_check_period);
rf_carrier_off();
rf_data_mode();
rf_rx_off();
pkt_got_ack = rf_tx_packet(&bmac_rfTxInfo);
rf_rx_off();
tx_data_ready = 0;
// Should signal user task here that Tx is done
return NRK_OK;
}
int8_t _bmac_tx ()
{
uint8_t v, backoff, backoff_count;
uint16_t b;
#ifdef DEBUG
nrk_kprintf (PSTR ("_bmac_tx()\r\n"));
#endif
if (cca_active) {
// Add random time here to stop nodes from synchronizing with eachother
b = _nrk_time_to_ticks (&_bmac_check_period);
b = b / ((rand () % 10) + 1);
//printf( "waiting %d\r\n",b );
nrk_wait_until_ticks (b);
//nrk_wait_ticks(b);
backoff_count = 1;
do {
#ifdef BMAC_MOD_CCA
v=_bmac_rx();
v=!v;
if (v == 1) {
break;
}
nrk_event_signal (bmac_rx_pkt_signal);
#else
v = _bmac_channel_check ();
if (v == 1)
break;
#endif
// Channel is busy
backoff = rand () % (_b_pow (backoff_count));
#ifdef DEBUG
printf ("backoff %d\r\n", backoff);
#endif
// printf( "backoff %d\r\n",backoff );
nrk_wait_until_next_n_periods (backoff);
backoff_count++;
if (backoff_count > 6)
backoff_count = 6; // cap it at 64
b = _nrk_time_to_ticks (&_bmac_check_period);
b = b / ((rand () % 10) + 1);
// printf( "waiting %d\r\n",b );
nrk_wait_until_ticks (b);
// nrk_wait_ticks(b);
}
while (v == 0);
}
// send extended preamble
bmac_rfTxInfo.cca = 0;
bmac_rfTxInfo.ackRequest = 0;
uint16_t ms = _bmac_check_period.secs * 1000;
ms += _bmac_check_period.nano_secs / 1000000;
//printf( "CR ms: %u\n",ms );
//target_t.nano_secs+=20*NANOS_PER_MS;
rf_rx_on ();
pkt_got_ack = rf_tx_packet_repeat (&bmac_rfTxInfo, ms);
// send packet
// pkt_got_ack=rf_tx_packet (&bmac_rfTxInfo);
rf_rx_off (); // Just in case auto-ack left radio on
tx_data_ready = 0;
nrk_event_signal (bmac_tx_pkt_done_signal);
return NRK_OK;
}
