lorawan_status_t LoRaPHYCN470::set_next_channel(channel_selection_params_t *params,
uint8_t *channel, lorawan_time_t *time,
lorawan_time_t *aggregate_timeoff)
{
uint8_t channel_count = 0;
uint8_t delay_tx = 0;
uint8_t enabled_channels[CN470_MAX_NB_CHANNELS] = {0};
lorawan_time_t next_tx_delay = 0;
band_t *band_table = (band_t *) phy_params.bands.table;
if (num_active_channels(phy_params.channels.mask, 0,
phy_params.channels.mask_size) == 0) {
// Reactivate default channels
copy_channel_mask(phy_params.channels.mask,
phy_params.channels.default_mask,
phy_params.channels.mask_size);
}
if (params->aggregate_timeoff
<= _lora_time->get_elapsed_time(params->last_aggregate_tx_time)) {
// Reset Aggregated time off
*aggregate_timeoff = 0;
// Update bands Time OFF
next_tx_delay = update_band_timeoff(params->joined,
params->dc_enabled,
band_table, phy_params.bands.size);
// Search how many channels are enabled
channel_count = enabled_channel_count(params->current_datarate,
phy_params.channels.mask,
enabled_channels, &delay_tx);
} else {
delay_tx++;
next_tx_delay = params->aggregate_timeoff -
_lora_time->get_elapsed_time(params->last_aggregate_tx_time);
}
if (channel_count > 0) {
// We found a valid channel
*channel = enabled_channels[get_random(0, channel_count - 1)];
*time = 0;
return LORAWAN_STATUS_OK;
}
if (delay_tx > 0) {
// Delay transmission due to AggregatedTimeOff or to a band time off
*time = next_tx_delay;
return LORAWAN_STATUS_DUTYCYCLE_RESTRICTED;
}
*time = 0;
return LORAWAN_STATUS_NO_CHANNEL_FOUND;
}
lorawan_status_t LoRaPHYKR920::set_next_channel(channel_selection_params_t* params,
uint8_t* channel, lorawan_time_t* time,
lorawan_time_t* aggregate_timeoff)
{
uint8_t next_channel_idx = 0;
uint8_t nb_enabled_channels = 0;
uint8_t delay_tx = 0;
uint8_t enabled_channels[KR920_MAX_NB_CHANNELS] = {0};
lorawan_time_t nextTxDelay = 0;
if (num_active_channels(channel_mask, 0, 1) == 0) {
// Reactivate default channels
channel_mask[0] |= LC(1) + LC(2) + LC(3);
}
if (params->aggregate_timeoff <= _lora_time->get_elapsed_time(params->last_aggregate_tx_time)) {
// Reset Aggregated time off
*aggregate_timeoff = 0;
// Update bands Time OFF
nextTxDelay = update_band_timeoff(params->joined, params->dc_enabled,
bands, KR920_MAX_NB_BANDS);
// Search how many channels are enabled
nb_enabled_channels = enabled_channel_count(params->current_datarate,
channel_mask,
enabled_channels, &delay_tx);
} else {
delay_tx++;
nextTxDelay = params->aggregate_timeoff - _lora_time->get_elapsed_time(params->last_aggregate_tx_time);
}
if (nb_enabled_channels > 0) {
for (uint8_t i = 0, j = get_random(0, nb_enabled_channels - 1);
i < KR920_MAX_NB_CHANNELS; i++) {
next_channel_idx = enabled_channels[j];
j = ( j + 1 ) % nb_enabled_channels;
// Perform carrier sense for KR920_CARRIER_SENSE_TIME
// If the channel is free, we can stop the LBT mechanism
_radio->lock();
if (_radio->perform_carrier_sense(MODEM_LORA,
channels[next_channel_idx].frequency,
KR920_RSSI_FREE_TH,
KR920_CARRIER_SENSE_TIME ) == true) {
// Free channel found
*channel = next_channel_idx;
*time = 0;
_radio->unlock();
return LORAWAN_STATUS_OK;
}
_radio->unlock();
}
return LORAWAN_STATUS_NO_FREE_CHANNEL_FOUND;
} else {
if (delay_tx > 0) {
// Delay transmission due to AggregatedTimeOff or to a band time off
*time = nextTxDelay;
return LORAWAN_STATUS_DUTYCYCLE_RESTRICTED;
}
// Datarate not supported by any channel, restore defaults
channel_mask[0] |= LC(1) + LC(2) + LC(3);
*time = 0;
return LORAWAN_STATUS_NO_CHANNEL_FOUND;
}
}
bool LoRaPHYUS915::set_next_channel(channel_selection_params_t* params,
uint8_t* channel, lorawan_time_t* time,
lorawan_time_t* aggregate_timeOff)
{
uint8_t nb_enabled_channels = 0;
uint8_t delay_tx = 0;
uint8_t enabled_channels[US915_MAX_NB_CHANNELS] = {0};
lorawan_time_t next_tx_delay = 0;
// Count 125kHz channels
if (num_active_channels(current_channel_mask, 0, 4) == 0) {
// If none of the 125 kHz Upstream channel found,
// Reactivate default channels
copy_channel_mask(current_channel_mask, channel_mask, 4);
}
// Check other channels
if (params->current_datarate >= DR_4) {
if ((current_channel_mask[4] & 0x00FF ) == 0) {
current_channel_mask[4] = channel_mask[4];
}
}
if (params->aggregate_timeoff <= _lora_time.get_elapsed_time(params->last_aggregate_tx_time)) {
// Reset Aggregated time off
*aggregate_timeOff = 0;
// Update bands Time OFF
next_tx_delay = update_band_timeoff(params->joined, params->dc_enabled, bands, US915_MAX_NB_BANDS);
// Search how many channels are enabled
nb_enabled_channels = enabled_channel_count(params->joined,
params->current_datarate,
current_channel_mask,
enabled_channels, &delay_tx);
} else {
delay_tx++;
next_tx_delay = params->aggregate_timeoff - _lora_time.get_elapsed_time(params->last_aggregate_tx_time);
}
if (nb_enabled_channels > 0) {
// We found a valid channel
*channel = enabled_channels[get_random( 0, nb_enabled_channels - 1 )];
// Disable the channel in the mask
disable_channel(current_channel_mask, *channel, US915_MAX_NB_CHANNELS - 8);
*time = 0;
return true;
} else {
if (delay_tx > 0) {
// Delay transmission due to AggregatedTimeOff or to a band time off
*time = next_tx_delay;
return true;
}
// Datarate not supported by any channel
*time = 0;
return false;
}
}
bool LoRaPHYAS923::set_next_channel(channel_selection_params_t* next_channel_prams,
uint8_t* channel, lorawan_time_t* time,
lorawan_time_t* aggregate_timeoff)
{
uint8_t next_channel_idx = 0;
uint8_t nb_enabled_channels = 0;
uint8_t delay_tx = 0;
uint8_t enabled_channels[AS923_MAX_NB_CHANNELS] = { 0 };
lorawan_time_t next_tx_delay = 0;
if (num_active_channels(channel_mask, 0, 1) == 0) {
// Reactivate default channels
channel_mask[0] |= LC(1) + LC(2);
}
if (next_channel_prams->aggregate_timeoff <= _lora_time.get_elapsed_time(next_channel_prams->last_aggregate_tx_time)) {
// Reset Aggregated time off
*aggregate_timeoff = 0;
// Update bands Time OFF
next_tx_delay = update_band_timeoff(next_channel_prams->joined,
next_channel_prams->dc_enabled,
bands, AS923_MAX_NB_BANDS);
// Search how many channels are enabled
nb_enabled_channels = enabled_channel_count(next_channel_prams->joined,
next_channel_prams->current_datarate,
channel_mask,
enabled_channels, &delay_tx);
} else {
delay_tx++;
next_tx_delay = next_channel_prams->aggregate_timeoff - _lora_time.get_elapsed_time(next_channel_prams->last_aggregate_tx_time);
}
if (nb_enabled_channels > 0) {
_radio->lock();
for (uint8_t i = 0, j = get_random(0, nb_enabled_channels - 1); i < AS923_MAX_NB_CHANNELS; i++) {
next_channel_idx = enabled_channels[j];
j = ( j + 1 ) % nb_enabled_channels;
// Perform carrier sense for AS923_CARRIER_SENSE_TIME
// If the channel is free, we can stop the LBT mechanism
if (_radio->perform_carrier_sense(MODEM_LORA,
channels[next_channel_idx].frequency,
AS923_RSSI_FREE_TH,
AS923_CARRIER_SENSE_TIME) == true) {
// Free channel found
_radio->unlock();
*channel = next_channel_idx;
*time = 0;
return true;
}
}
_radio->unlock();
return false;
} else {
if (delay_tx > 0) {
// Delay transmission due to AggregatedTimeOff or to a band time off
*time = next_tx_delay;
return true;
}
// Datarate not supported by any channel, restore defaults
channel_mask[0] |= LC( 1 ) + LC( 2 );
*time = 0;
return false;
}
}
