/**@brief Function for processing a received vendor specific packet.
*
* @param[in] p_buffer Pointer to the packet data.
* @param[in] length Length of packet data in bytes.
*/
static void rx_vendor_specific_pkt_type_handle(const uint8_t * p_buffer, uint32_t length)
{
// @note: no pointer validation check needed as allready checked by calling function.
uint32_t err_code;
if (is_rx_pkt_valid(p_buffer, length))
{
// RX packet is valid: validate sequence number.
const uint8_t rx_seq_number = packet_seq_nmbr_extract(p_buffer);
if (packet_number_expected_get() == rx_seq_number)
{
// Sequence number is valid: transmit acknowledgement.
packet_number_expected_inc();
ack_transmit();
m_is_slip_decode_ready = true;
err_code = hci_mem_pool_rx_data_size_set(length);
APP_ERROR_CHECK(err_code);
err_code = hci_mem_pool_rx_produce(HCI_RX_BUF_SIZE, (void **)&mp_slip_used_rx_buffer);
APP_ERROR_CHECK_BOOL((err_code == NRF_SUCCESS) || (err_code == NRF_ERROR_NO_MEM));
// If memory pool RX buffer produce succeeded we register that buffer to slip layer
// otherwise we register the internal acknowledgement buffer.
err_code = hci_slip_rx_buffer_register(
(err_code == NRF_SUCCESS) ? mp_slip_used_rx_buffer : m_rx_ack_buffer,
(err_code == NRF_SUCCESS) ? HCI_RX_BUF_SIZE : ACK_BUF_SIZE);
APP_ERROR_CHECK(err_code);
if (m_transport_event_handle != NULL)
{
// Send application event of RX packet reception.
const hci_transport_evt_t evt = {HCI_TRANSPORT_RX_RDY};
m_transport_event_handle(evt);
}
}
else
{
// RX packet discarded: sequence number not valid, set the same buffer to slip layer in
// order to avoid buffer overrun.
err_code = hci_slip_rx_buffer_register(mp_slip_used_rx_buffer, HCI_RX_BUF_SIZE);
APP_ERROR_CHECK(err_code);
// As packet did not have expected sequence number: send acknowledgement with the
// current expected sequence number.
ack_transmit();
}
}
else
{
// RX packet discarded: reset the same buffer to slip layer in order to avoid buffer
// overrun.
err_code = hci_slip_rx_buffer_register(mp_slip_used_rx_buffer, HCI_RX_BUF_SIZE);
APP_ERROR_CHECK(err_code);
}
}
uint32_t hci_transport_open(void)
{
mp_tx_buffer = NULL;
m_tx_buffer_length = 0;
m_tx_retry_counter = 0;
m_is_slip_decode_ready = false;
m_tx_state = TX_STATE_IDLE;
m_packet_expected_seq_number = INITIAL_ACK_NUMBER_EXPECTED;
m_packet_transmit_seq_number = INITIAL_ACK_NUMBER_TX;
m_tx_done_result_code = HCI_TRANSPORT_TX_DONE_FAILURE;
uint32_t err_code = app_timer_create(&m_app_timer_id,
APP_TIMER_MODE_REPEATED,
hci_transport_timeout_handle);
if (err_code != NRF_SUCCESS)
{
// @note: conduct required interface adjustment.
return NRF_ERROR_INTERNAL;
}
err_code = hci_mem_pool_open();
if (err_code != NRF_SUCCESS)
{
return err_code;
}
err_code = hci_slip_open();
if (err_code != NRF_SUCCESS)
{
return err_code;
}
err_code = hci_mem_pool_rx_produce(RX_BUF_SIZE, (void **)&mp_slip_used_rx_buffer);
if (err_code != NRF_SUCCESS)
{
// @note: conduct required interface adjustment.
return NRF_ERROR_INTERNAL;
}
err_code = hci_slip_rx_buffer_register(mp_slip_used_rx_buffer, RX_BUF_SIZE);
return err_code;
}
/**@brief Function for handling slip events.
*
* @param[in] event The event structure.
*/
void slip_event_handle(hci_slip_evt_t event)
{
uint32_t return_code;
uint32_t err_code;
switch (event.evt_type)
{
case HCI_SLIP_TX_DONE:
tx_sm_event_handle(TX_EVENT_SLIP_TX_DONE);
break;
case HCI_SLIP_RX_RDY:
return_code = packet_type_decode(event.packet, event.packet_length);
switch (return_code)
{
case PKT_TYPE_VENDOR_SPECIFIC:
rx_vendor_specific_pkt_type_handle(event.packet, event.packet_length);
break;
case PKT_TYPE_ACK:
if (rx_ack_pkt_type_handle(event.packet))
{
// Valid expected acknowledgement packet received: set correct TX done event
// callback function result code and execute state change.
m_tx_done_result_code = HCI_TRANSPORT_TX_DONE_SUCCESS;
tx_sm_event_handle(TX_EVENT_VALID_RX_ACK);
}
/* fall-through */
default:
// RX packet dropped: reset memory buffer to slip in order to avoid RX buffer
// overflow.
// If existing mem pool produced RX buffer exists reuse that one. If existing
// mem pool produced RX buffer does not exist try to produce new one. If
// producing fails use the internal acknowledgement buffer.
if (mp_slip_used_rx_buffer != NULL)
{
err_code = hci_slip_rx_buffer_register(mp_slip_used_rx_buffer, HCI_RX_BUF_SIZE);
APP_ERROR_CHECK(err_code);
}
else
{
err_code = hci_mem_pool_rx_produce(HCI_RX_BUF_SIZE,
(void **)&mp_slip_used_rx_buffer);
APP_ERROR_CHECK_BOOL((err_code == NRF_SUCCESS) ||
(err_code == NRF_ERROR_NO_MEM));
err_code = hci_slip_rx_buffer_register(
(err_code == NRF_SUCCESS) ? mp_slip_used_rx_buffer : m_rx_ack_buffer,
(err_code == NRF_SUCCESS) ? HCI_RX_BUF_SIZE : ACK_BUF_SIZE);
APP_ERROR_CHECK(err_code);
}
break;
}
break;
case HCI_SLIP_RX_OVERFLOW:
err_code = hci_slip_rx_buffer_register(m_rx_ack_buffer, ACK_BUF_SIZE);
APP_ERROR_CHECK(err_code);
break;
case HCI_SLIP_ERROR:
APP_ERROR_HANDLER(event.evt_type);
break;
default:
APP_ERROR_HANDLER(event.evt_type);
break;
}
}
