static uint32_t frame_send()
{
uint32_t err_code;
m_current_tx_frame_length = compute_current_frame_length(m_tx_packet_length,
m_accumulated_tx_packet_length);
if (m_current_tx_frame_length == SER_PHY_SPI_5W_MTU_SIZE)
{
m_current_tx_frame_length -= 1; //extra space for guard byte must be taken into account for MTU
}
m_tx_frame_buffer[0] = 0; //guard byte
copy_buff(&(m_tx_frame_buffer[1]),
&(m_p_tx_buffer[m_accumulated_tx_packet_length]),
m_current_tx_frame_length);
err_code = spi_slave_buffers_set(m_tx_frame_buffer,
m_rx_frame_buffer,
m_current_tx_frame_length + 1,
m_current_tx_frame_length + 1);
return err_code;
}
static void ser_phy_switch_state(ser_phy_event_source_t evt_src)
{
uint32_t err_code = NRF_SUCCESS;
static bool m_waitForReadyFlag = 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_waitForReadyFlag = 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_waitForReadyFlag = 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_waitForReadyFlag = true;
}
}
else if ((evt_src == SER_PHY_EVT_GPIO_RDY) && m_waitForReadyFlag)
{
m_waitForReadyFlag = 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_waitForReadyFlag = true;
}
}
else
{
spi_master_raw_assert(m_accumulated_tx_packet_length == m_tx_packet_length);
//Release TX buffer
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_waitForReadyFlag )
{
m_waitForReadyFlag = 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_waitForReadyFlag = true;
}
}
else if ( (evt_src == SER_PHY_EVT_GPIO_RDY) && m_waitForReadyFlag)
{
m_waitForReadyFlag = 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_len_buffer[1])); //skip guard when receiving
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_waitForReadyFlag = true;
}
}
else if ((evt_src == SER_PHY_EVT_GPIO_RDY) && m_waitForReadyFlag)
{
m_waitForReadyFlag = 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)
{
if (mp_rx_buffer)
{
copy_buff(&(mp_rx_buffer[m_accumulated_rx_packet_length]),
&(m_recv_buffer[1]),
m_current_rx_packet_length - 1); //skip guard byte when receiving
}
m_accumulated_rx_packet_length += (m_current_rx_packet_length - 1);
if (m_accumulated_rx_packet_length < m_rx_packet_length)
{
if (m_slave_ready_flag)
{
err_code = frame_get();
}
else
{
m_waitForReadyFlag = 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();
}
//Release RX buffer
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_waitForReadyFlag)
{
m_waitForReadyFlag = false;
err_code = frame_get();
}
break;
default:
break;
}
if (err_code != NRF_SUCCESS)
{
(void)err_code;
}
}