void l2cap_hand_out_credits(void){
if (new_credits_blocked) return; // we're told not to. used by daemon
linked_item_t *it;
for (it = (linked_item_t *) l2cap_channels; it ; it = it->next){
if (!hci_number_free_acl_slots()) return;
l2cap_channel_t * channel = (l2cap_channel_t *) it;
if (channel->state != L2CAP_STATE_OPEN) continue;
if (hci_number_outgoing_packets(channel->handle) < NR_BUFFERED_ACL_PACKETS && channel->packets_granted == 0) {
l2cap_emit_credits(channel, 1);
}
}
}
int hci_send_acl_packet(uint8_t *packet, int size){
// check for free places on BT module
if (!hci_number_free_acl_slots()) return BTSTACK_ACL_BUFFERS_FULL;
hci_con_handle_t con_handle = READ_ACL_CONNECTION_HANDLE(packet);
hci_connection_t *connection = connection_for_handle( con_handle);
if (!connection) return 0;
hci_connection_timestamp(connection);
// count packet
connection->num_acl_packets_sent++;
// log_info("hci_send_acl_packet - handle %u, sent %u\n", connection->con_handle, connection->num_acl_packets_sent);
// send packet
int err = hci_stack.hci_transport->send_packet(HCI_ACL_DATA_PACKET, packet, size);
return err;
}
int hci_can_send_packet_now(uint8_t packet_type){
// check for async hci transport implementations
if (hci_stack.hci_transport->can_send_packet_now){
if (!hci_stack.hci_transport->can_send_packet_now(packet_type)){
return 0;
}
}
// check regular Bluetooth flow control
switch (packet_type) {
case HCI_ACL_DATA_PACKET:
return hci_number_free_acl_slots();
case HCI_COMMAND_DATA_PACKET:
return hci_stack.num_cmd_packets;
default:
return 0;
}
}