/**@brief Function for TX state machine event processing in a state centric manner.
*
* @param[in] event Type of event occurred.
*/
static void tx_sm_event_handle(tx_event_t event)
{
uint32_t err_code;
switch (m_tx_state)
{
case TX_STATE_IDLE:
if (event == TX_EVENT_STATE_ENTRY)
{
err_code = app_timer_stop(m_app_timer_id);
APP_ERROR_CHECK(err_code);
// Send TX-done event if registered handler exists.
if (m_transport_tx_done_handle != NULL)
{
m_transport_tx_done_handle(m_tx_done_result_code);
}
}
break;
case TX_STATE_PENDING:
if (event == TX_EVENT_SLIP_TX_DONE)
{
// @note: this call should always succeed as called from HCI_SLIP_TX_DONE context
// and error cases are managed by dedicated error event from the slip layer.
err_code = hci_slip_write(mp_tx_buffer,
(m_tx_buffer_length + PKT_HDR_SIZE + PKT_CRC_SIZE));
APP_ERROR_CHECK(err_code);
tx_sm_state_change(TX_STATE_ACTIVE);
}
break;
case TX_STATE_ACTIVE:
switch (event)
{
case TX_EVENT_VALID_RX_ACK:
// Tx sequence number counter incremented as packet transmission
// acknowledged by peer transport entity.
packet_number_tx_inc();
tx_sm_state_change(TX_STATE_IDLE);
break;
case TX_EVENT_STATE_ENTRY:
m_tx_retry_counter = 0;
err_code = app_timer_start(m_app_timer_id,
RETRANSMISSION_TIMEOUT_IN_TICKS,
NULL);
APP_ERROR_CHECK(err_code);
break;
case TX_EVENT_TIMEOUT:
if (m_tx_retry_counter != MAX_RETRY_COUNT)
{
++m_tx_retry_counter;
// @note: no return value check done for hci_slip_write(...) call as current
// system design allows use case where retransmission is not accepted by the
// slip layer due to existing acknowledgement packet transmission in the
// slip layer.
UNUSED_VARIABLE(hci_slip_write(mp_tx_buffer,
(m_tx_buffer_length +
PKT_HDR_SIZE +
PKT_CRC_SIZE)));
}
else
{
// Application packet retransmission count reached:
// - set correct TX done event callback function result code
// - execute state change
// @note: m_tx_retry_counter is reset in TX_STATE_ACTIVE state entry.
m_tx_done_result_code = HCI_TRANSPORT_TX_DONE_FAILURE;
tx_sm_state_change(TX_STATE_IDLE);
}
break;
default:
// No implementation needed.
break;
}
break;
default:
// No implementation needed.
break;
}
}
// Start the timers
static void timers_start(void) {
uint32_t err_code = app_timer_start(test_timer, BLINK_RATE, NULL);
APP_ERROR_CHECK(err_code);
}
