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hci: implement implicit flow control for SCO packets

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This commit is contained in:
Matthias Ringwald 2019-02-01 18:06:10 +01:00
parent d861f4bf32
commit 0b3f95df2e
1 changed files with 34 additions and 10 deletions
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44
src/hci.c
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@ -569,8 +569,12 @@ int hci_can_send_acl_classic_packet_now(void){
int hci_can_send_prepared_sco_packet_now(void){
if (!hci_transport_can_send_prepared_packet_now(HCI_SCO_DATA_PACKET)) return 0;
if (!hci_stack->synchronous_flow_control_enabled) return 1;
return hci_number_free_sco_slots() > 0;
if (hci_stack->synchronous_flow_control_enabled) {
return hci_number_free_sco_slots() > 0;
} else {
// additional sco slot as flow control is implicit
return hci_number_free_sco_slots() > 2;
}
}
int hci_can_send_sco_packet_now(void){
@ -2513,16 +2517,36 @@ static void event_handler(uint8_t *packet, int size){
#ifdef ENABLE_CLASSIC
static void sco_handler(uint8_t * packet, uint16_t size){
if (!hci_stack->sco_packet_handler) return;
hci_stack->sco_packet_handler(HCI_SCO_DATA_PACKET, 0, packet, size);
#ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
// lookup connection struct
hci_con_handle_t con_handle = READ_SCO_CONNECTION_HANDLE(packet);
hci_connection_t *conn = hci_connection_for_handle(con_handle);
if (conn){
conn->num_packets_completed++;
hci_stack->host_completed_packets = 1;
hci_run();
hci_connection_t * conn = hci_connection_for_handle(con_handle);
if (!conn) return;
int notify_sco = 0;
// treat received SCO packets as indicator of successfully sent packet, if flow control is not explicite
log_info("sco flow %u, handle 0x%04x, packets sent %u", hci_stack->synchronous_flow_control_enabled, (int) con_handle, conn->num_sco_packets_sent);
if (hci_stack->synchronous_flow_control_enabled == 0){
if (conn->num_sco_packets_sent){
conn->num_sco_packets_sent--;
hci_notify_if_sco_can_send_now();
}
}
// deliver to app
if (hci_stack->sco_packet_handler) {
hci_stack->sco_packet_handler(HCI_SCO_DATA_PACKET, 0, packet, size);
}
// notify app if it can send again
if (notify_sco){
hci_notify_if_sco_can_send_now();
}
#ifdef ENABLE_HCI_CONTROLLER_TO_HOST_FLOW_CONTROL
conn->num_packets_completed++;
hci_stack->host_completed_packets = 1;
hci_run();
#endif
}
#endif