/**
* \brief Slave driver main state machine
* For UML graph, please refer to SDK documentation
*/
static void spi_slave_event_handle(spi_slave_evt_t event)
{
static uint32_t err_code = NRF_SUCCESS;
static uint16_t packetLength;
switch (m_trans_state)
{
case SPI_RAW_STATE_SETUP_HEADER:
m_trans_state = SPI_RAW_STATE_RX_HEADER;
err_code = header_get();
break;
case SPI_RAW_STATE_RX_HEADER:
if (event.evt_type == SPI_SLAVE_BUFFERS_SET_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_BUFFERS_SET(0);
set_ready_line();
}
if (event.evt_type == SPI_SLAVE_XFER_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_RX_XFER_DONE(event.rx_amount);
spi_slave_raw_assert(event.rx_amount == SER_PHY_HEADER_SIZE);
packetLength = uint16_decode(m_header_rx_buffer);
if (packetLength != 0 )
{
m_trans_state = SPI_RAW_STATE_MEM_REQUESTED;
m_buffer_reqested_flag = true;
m_rx_packet_length = packetLength;
callback_memory_request(packetLength);
}
else
{
if (m_p_tx_buffer)
{
clear_request_line();
m_trans_state = SPI_RAW_STATE_TX_HEADER;
err_code = header_send(m_tx_packet_length);
}
else
{
//there is nothing to send - zero response facilitates pooling - but perhaps, it should be assert
err_code = header_send(0);
}
}
}
break;
case SPI_RAW_STATE_MEM_REQUESTED:
if (event.evt_type == SPI_SLAVE_EVT_TYPE_MAX) //This is API dummy event
{
m_buffer_reqested_flag = false;
m_trans_state = SPI_RAW_STATE_RX_PAYLOAD;
m_accumulated_rx_packet_length = 0;
err_code = frame_get();
}
break;
case SPI_RAW_STATE_RX_PAYLOAD:
if (event.evt_type == SPI_SLAVE_BUFFERS_SET_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_BUFFERS_SET(0);
set_ready_line();
}
if (event.evt_type == SPI_SLAVE_XFER_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_RX_XFER_DONE(event.rx_amount);
spi_slave_raw_assert(event.rx_amount == m_current_rx_frame_length);
m_accumulated_rx_packet_length += m_current_rx_frame_length;
if (m_accumulated_rx_packet_length < m_rx_packet_length )
{
err_code = frame_get();
}
else
{
spi_slave_raw_assert(m_accumulated_rx_packet_length == m_rx_packet_length);
m_trans_state = SPI_RAW_STATE_RX_HEADER;
err_code = header_get();
if (!m_trash_payload_flag)
{
callback_packet_received(m_p_rx_buffer, m_accumulated_rx_packet_length);
}
else
{
callback_packet_dropped();
}
}
}
break;
case SPI_RAW_STATE_TX_HEADER:
if (event.evt_type == SPI_SLAVE_BUFFERS_SET_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_BUFFERS_SET(0);
set_ready_line();
}
if (event.evt_type == SPI_SLAVE_XFER_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_TX_XFER_DONE(event.tx_amount);
spi_slave_raw_assert(event.tx_amount == SER_PHY_HEADER_SIZE + 1);
m_trans_state = SPI_RAW_STATE_TX_PAYLOAD;
m_accumulated_tx_packet_length = 0;
err_code = frame_send();
}
break;
case SPI_RAW_STATE_TX_PAYLOAD:
if (event.evt_type == SPI_SLAVE_BUFFERS_SET_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_BUFFERS_SET(0);
set_ready_line();
}
if (event.evt_type == SPI_SLAVE_XFER_DONE)
{
DEBUG_EVT_SPI_SLAVE_RAW_TX_XFER_DONE(event.tx_amount);
spi_slave_raw_assert(event.tx_amount == m_current_tx_frame_length + 1);
m_accumulated_tx_packet_length += m_current_tx_frame_length;
if ( m_accumulated_tx_packet_length < m_tx_packet_length )
{
err_code = frame_send();
}
else
{
spi_slave_raw_assert(m_accumulated_tx_packet_length == m_tx_packet_length);
//clear pointer before callback
m_p_tx_buffer = NULL;
callback_packet_transmitted();
//spi slave TX transfer is possible only when RX is ready, so return to waiting for a header
m_trans_state = SPI_RAW_STATE_RX_HEADER;
err_code = header_get();
}
}
break;
default:
err_code = NRF_ERROR_INVALID_STATE;
break;
}
APP_ERROR_CHECK(err_code);
}
/**
* \brief Master driver main state machine
* Executed only in the context of PendSV_Handler()
* For UML graph, please refer to SDK documentation
*/
static void ser_phy_switch_state(ser_phy_event_source_t evt_src)
{
uint32_t err_code = NRF_SUCCESS;
static bool m_wait_for_ready_flag = false; //local scheduling flag to defer RDY events
switch (m_spi_master_state)
{
case SER_PHY_STATE_IDLE:
if (evt_src == SER_PHY_EVT_GPIO_REQ)
{
m_wait_for_ready_flag = false;
if (m_slave_ready_flag)
{
m_spi_master_state = SER_PHY_STATE_TX_ZERO_HEADER;
err_code = header_send(0);
}
else
{
m_spi_master_state = SER_PHY_STATE_RX_WAIT_FOR_RDY;
}
}
else if (evt_src == SER_PHY_EVT_TX_API_CALL)
{
spi_master_raw_assert(mp_tx_buffer != NULL); //api event with tx_buffer == NULL has no sense
m_wait_for_ready_flag = false;
if (m_slave_ready_flag)
{
m_spi_master_state = SER_PHY_STATE_TX_HEADER;
err_code = header_send(m_tx_buf_len);
}
else
{
m_spi_master_state = SER_PHY_STATE_TX_WAIT_FOR_RDY;
}
}
break;
case SER_PHY_STATE_TX_WAIT_FOR_RDY:
if (evt_src == SER_PHY_EVT_GPIO_RDY)
{
m_spi_master_state = SER_PHY_STATE_TX_HEADER;
err_code = header_send(m_tx_buf_len);
}
break;
case SER_PHY_STATE_RX_WAIT_FOR_RDY:
if (evt_src == SER_PHY_EVT_GPIO_RDY)
{
m_spi_master_state = SER_PHY_STATE_TX_ZERO_HEADER;
err_code = header_send(0);
}
break;
case SER_PHY_STATE_TX_HEADER:
if (evt_src == SER_PHY_EVT_SPI_TRANSFER_DONE)
{
m_tx_packet_length = m_tx_buf_len;
m_accumulated_tx_packet_length = 0;
if (m_slave_ready_flag)
{
m_spi_master_state = SER_PHY_STATE_TX_PAYLOAD;
err_code = frame_send();
}
else
{
m_wait_for_ready_flag = true;
}
}
else if ((evt_src == SER_PHY_EVT_GPIO_RDY) && m_wait_for_ready_flag)
{
m_wait_for_ready_flag = false;
m_spi_master_state = SER_PHY_STATE_TX_PAYLOAD;
err_code = frame_send();
}
break;
case SER_PHY_STATE_TX_PAYLOAD:
if (evt_src == SER_PHY_EVT_SPI_TRANSFER_DONE)
{
if (m_accumulated_tx_packet_length < m_tx_packet_length)
{
if (m_slave_ready_flag)
{
err_code = frame_send();
}
else
{
m_wait_for_ready_flag = true;
}
}
else
{
spi_master_raw_assert(m_accumulated_tx_packet_length == m_tx_packet_length);
buffer_release(&mp_tx_buffer, &m_tx_buf_len);
callback_packet_sent();
if ( m_slave_request_flag)
{
if (m_slave_ready_flag)
{
m_spi_master_state = SER_PHY_STATE_TX_ZERO_HEADER;
err_code = header_send(0);
}
else
{
m_spi_master_state = SER_PHY_STATE_RX_WAIT_FOR_RDY;
}
}
else
{
m_spi_master_state = SER_PHY_STATE_IDLE; //m_Tx_buffer is NULL - have to wait for API event
}
}
}
else if ((evt_src == SER_PHY_EVT_GPIO_RDY) && m_wait_for_ready_flag )
{
m_wait_for_ready_flag = false;
err_code = frame_send();
}
break;
case SER_PHY_STATE_TX_ZERO_HEADER:
if (evt_src == SER_PHY_EVT_SPI_TRANSFER_DONE)
{
if (m_slave_ready_flag)
{
m_spi_master_state = SER_PHY_STATE_RX_HEADER;
err_code = header_get();
}
else
{
m_wait_for_ready_flag = true;
}
}
else if ( (evt_src == SER_PHY_EVT_GPIO_RDY) && m_wait_for_ready_flag)
{
m_wait_for_ready_flag = false;
m_spi_master_state = SER_PHY_STATE_RX_HEADER;
err_code = header_get();
}
break;
case SER_PHY_STATE_RX_HEADER:
if (evt_src == SER_PHY_EVT_SPI_TRANSFER_DONE)
{
m_spi_master_state = SER_PHY_STATE_MEMORY_REQUEST;
m_rx_buf_len = uint16_decode(m_header_buffer);
m_rx_packet_length = m_rx_buf_len;
callback_mem_request();
}
break;
case SER_PHY_STATE_MEMORY_REQUEST:
if (evt_src == SER_PHY_EVT_RX_API_CALL)
{
m_accumulated_rx_packet_length = 0;
if (m_slave_ready_flag)
{
m_spi_master_state = SER_PHY_STATE_RX_PAYLOAD;
err_code = frame_get();
}
else
{
m_wait_for_ready_flag = true;
}
}
else if ((evt_src == SER_PHY_EVT_GPIO_RDY) && m_wait_for_ready_flag)
{
m_wait_for_ready_flag = false;
m_spi_master_state = SER_PHY_STATE_RX_PAYLOAD;
err_code = frame_get();
}
break;
case SER_PHY_STATE_RX_PAYLOAD:
if (evt_src == SER_PHY_EVT_SPI_TRANSFER_DONE)
{
m_accumulated_rx_packet_length += m_current_rx_packet_length;
if (m_accumulated_rx_packet_length < m_rx_packet_length)
{
if (m_slave_ready_flag)
{
err_code = frame_get();
}
else
{
m_wait_for_ready_flag = true;
}
}
else
{
spi_master_raw_assert(m_accumulated_rx_packet_length == m_rx_packet_length);
if (mp_rx_buffer == NULL)
{
callback_packet_dropped();
}
else
{
callback_packet_received();
}
buffer_release(&mp_rx_buffer, &m_rx_buf_len);
if (mp_tx_buffer != NULL) //mp_tx_buffer !=NULL, this means that API_EVT was scheduled
{
if (m_slave_ready_flag )
{
err_code = header_send(m_tx_buf_len);
m_spi_master_state = SER_PHY_STATE_TX_HEADER;
}
else
{
m_spi_master_state = SER_PHY_STATE_TX_WAIT_FOR_RDY;
}
}
else if (m_slave_request_flag)
{
if (m_slave_ready_flag)
{
m_spi_master_state = SER_PHY_STATE_TX_ZERO_HEADER;
err_code = header_send(0);
}
else
{
m_spi_master_state = SER_PHY_STATE_RX_WAIT_FOR_RDY;
}
}
else
{
m_spi_master_state = SER_PHY_STATE_IDLE;
}
}
}
else if ( evt_src == SER_PHY_EVT_GPIO_RDY && m_wait_for_ready_flag)
{
m_wait_for_ready_flag = false;
err_code = frame_get();
}
break;
default:
break;
}
if (err_code != NRF_SUCCESS)
{
(void)err_code;
}
}