Пример #1
0
ret_code_t nrf_drv_i2s_start(uint32_t * p_rx_buffer,
                             uint32_t * p_tx_buffer,
                             uint16_t   buffer_size,
                             uint8_t    flags)
{
    ASSERT((p_rx_buffer != NULL) || (p_tx_buffer != NULL));

    uint16_t buffer_half_size = buffer_size / 2;
    ASSERT(buffer_half_size != 0);

    VERIFY_MODULE_INITIALIZED();

    ret_code_t err_code;

    if ((p_rx_buffer != NULL) && !nrf_drv_is_in_RAM(p_rx_buffer))
    {
        err_code = NRF_ERROR_INVALID_ADDR;
        NRF_LOG_WARNING("Function: %s, error code: %s.",
            (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
        return err_code;
    }

    if ((p_tx_buffer != NULL) && !nrf_drv_is_in_RAM(p_tx_buffer))
    {
        err_code = NRF_ERROR_INVALID_ADDR;
        NRF_LOG_WARNING("Function: %s, error code: %s.",
            (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
        return err_code;
    }

    // Initially we set up the peripheral to use the first half of each buffer,
    // then in 'I2S_IRQHandler' we will switch to the second half.
    nrf_i2s_transfer_set(NRF_I2S, buffer_half_size, p_rx_buffer, p_tx_buffer);

    m_cb.p_rx_buffer      = p_rx_buffer;
    m_cb.p_tx_buffer      = p_tx_buffer;
    m_cb.buffer_half_size = buffer_half_size;
    m_cb.just_started     = true;

    if ((flags & NRF_DRV_I2S_FLAG_SYNCHRONIZED_MODE) &&
        // [synchronized mode makes sense only when both RX and TX are enabled]
        (m_cb.p_rx_buffer != NULL) && (m_cb.p_tx_buffer != NULL))
    {
        m_cb.synchronized_mode = true;
        m_cb.rx_ready          = false;
        m_cb.tx_ready          = false;
    }
    else
    {
        m_cb.synchronized_mode = false;
    }

    nrf_i2s_enable(NRF_I2S);

    m_cb.state = NRF_DRV_STATE_POWERED_ON;

    if (m_cb.p_tx_buffer != NULL)
    {
        // Get from the application the first portion of data to be sent - we
        // need to have it in the transmit buffer before we start the transfer.
        // Unless the synchronized mode is active. In this mode we must wait
        // with this until the first portion of data is received, so here we
        // just make sure that there will be silence on the SDOUT line prior
        // to that moment.
        if (m_cb.synchronized_mode)
        {
            memset(m_cb.p_tx_buffer, 0,
                m_cb.buffer_half_size * sizeof(uint32_t));
        }
        else
        {
            m_cb.handler(NULL, m_cb.p_tx_buffer, m_cb.buffer_half_size);
        }
    }

    nrf_i2s_event_clear(NRF_I2S, NRF_I2S_EVENT_RXPTRUPD);
    nrf_i2s_event_clear(NRF_I2S, NRF_I2S_EVENT_TXPTRUPD);
    nrf_i2s_int_enable(NRF_I2S,
        NRF_I2S_INT_RXPTRUPD_MASK | NRF_I2S_INT_TXPTRUPD_MASK);
    nrf_i2s_task_trigger(NRF_I2S, NRF_I2S_TASK_START);

    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.",
        (uint32_t)__func__, (uint32_t)NRF_LOG_ERROR_STRING_GET(err_code));
    return err_code;
}
Пример #2
0
void I2S_IRQHandler(void)
{
    uint32_t const * p_data_received = NULL;
    uint32_t       * p_data_to_send  = NULL;

    if (nrf_i2s_event_check(NRF_I2S, NRF_I2S_EVENT_TXPTRUPD))
    {
        nrf_i2s_event_clear(NRF_I2S, NRF_I2S_EVENT_TXPTRUPD);
        NRF_LOG_DEBUG("Event: %s.",
            (uint32_t)EVT_TO_STR(NRF_I2S_EVENT_TXPTRUPD));

        // If transmission is not enabled, but for some reason the TXPTRUPD
        // event has been generated, just ignore it.
        if (m_cb.p_tx_buffer != NULL)
        {
            uint32_t * p_tx_buffer_next;
            if (nrf_i2s_tx_buffer_get(NRF_I2S) == m_cb.p_tx_buffer)
            {
                p_tx_buffer_next = m_cb.p_tx_buffer + m_cb.buffer_half_size;
            }
            else
            {
                p_tx_buffer_next = m_cb.p_tx_buffer;
            }
            nrf_i2s_tx_buffer_set(NRF_I2S, p_tx_buffer_next);

            m_cb.tx_ready = true;

            // Now the part of the buffer that we've configured as "next" should
            // be filled by the application with proper data to be sent;
            // the peripheral is sending data from the other part of the buffer
            // (but it will finish soon...).
            p_data_to_send = p_tx_buffer_next;

        }
    }

    if (nrf_i2s_event_check(NRF_I2S, NRF_I2S_EVENT_RXPTRUPD))
    {
        nrf_i2s_event_clear(NRF_I2S, NRF_I2S_EVENT_RXPTRUPD);
        NRF_LOG_DEBUG("Event: %s.",
            (uint32_t)EVT_TO_STR(NRF_I2S_EVENT_RXPTRUPD));

        // If reception is not enabled, but for some reason the RXPTRUPD event
        // has been generated, just ignore it.
        if (m_cb.p_rx_buffer != NULL)
        {
            uint32_t * p_rx_buffer_next;
            if (nrf_i2s_rx_buffer_get(NRF_I2S) == m_cb.p_rx_buffer)
            {
                p_rx_buffer_next = m_cb.p_rx_buffer + m_cb.buffer_half_size;
            }
            else
            {
                p_rx_buffer_next = m_cb.p_rx_buffer;
            }
            nrf_i2s_rx_buffer_set(NRF_I2S, p_rx_buffer_next);

            m_cb.rx_ready = true;

            // The RXPTRUPD event is generated for the first time right after
            // the transfer is started. Since there is no data received yet at
            // this point we only update the buffer pointer (it is done above),
            // there is no callback to the application.
            // [for synchronized mode this has to be handled differently -
            //  see below]
            if (m_cb.just_started && !m_cb.synchronized_mode)
            {
                m_cb.just_started = false;
            }
            else
            {
                // The RXPTRUPD event indicates that from now on the peripheral
                // will be filling the part of the buffer that was pointed at
                // the time the event has been generated, hence now we can let
                // the application process the data stored in the other part of
                // the buffer - the one that we've just set to be filled next.
                p_data_received = p_rx_buffer_next;
            }
        }
    }

    // Call the data handler passing received data to the application and/or
    // requesting data to be sent.
    if (!m_cb.synchronized_mode)
    {
        if ((p_data_received != NULL) || (p_data_to_send != NULL))
        {
            if (p_data_received != NULL)
            {
                NRF_LOG_DEBUG("Rx data:");
                NRF_LOG_HEXDUMP_DEBUG(p_data_received,
                    m_cb.buffer_half_size * sizeof(p_data_received[0]));
            }
            m_cb.handler(p_data_received, p_data_to_send,
                m_cb.buffer_half_size);
            if (p_data_to_send != NULL)
            {
                NRF_LOG_DEBUG("Tx data:");
                NRF_LOG_HEXDUMP_DEBUG(p_data_to_send,
                    m_cb.buffer_half_size * sizeof(p_data_to_send[0]));
            }
        }
    }
    // In the synchronized mode wait until the events for both RX and TX occur.
    // And ignore the initial occurrences of these events, since they only
    // indicate that the transfer has started - no data is received yet at
    // that moment, so we have got nothing to pass to the application.
    else
    {
        if (m_cb.rx_ready && m_cb.tx_ready)
        {
            m_cb.rx_ready = false;
            m_cb.tx_ready = false;

            if (m_cb.just_started)
            {
                m_cb.just_started = false;
            }
            else
            {
                NRF_LOG_DEBUG("Rx data:");
                NRF_LOG_HEXDUMP_DEBUG(nrf_i2s_rx_buffer_get(NRF_I2S),
                    m_cb.buffer_half_size * sizeof(p_data_to_send[0]));
                m_cb.handler(nrf_i2s_rx_buffer_get(NRF_I2S),
                             nrf_i2s_tx_buffer_get(NRF_I2S),
                             m_cb.buffer_half_size);
                NRF_LOG_DEBUG("Tx data:");
                NRF_LOG_HEXDUMP_DEBUG(nrf_i2s_tx_buffer_get(NRF_I2S),
                    m_cb.buffer_half_size * sizeof(p_data_to_send[0]));
            }
        }
    }
}
Пример #3
0
void nrfx_i2s_irq_handler(void)
{
    if (nrf_i2s_event_check(NRF_I2S, NRF_I2S_EVENT_TXPTRUPD))
    {
        nrf_i2s_event_clear(NRF_I2S, NRF_I2S_EVENT_TXPTRUPD);
        m_cb.tx_ready = true;
        if (m_cb.use_tx && m_cb.buffers_needed)
        {
            m_cb.buffers_reused = true;
        }
    }
    if (nrf_i2s_event_check(NRF_I2S, NRF_I2S_EVENT_RXPTRUPD))
    {
        nrf_i2s_event_clear(NRF_I2S, NRF_I2S_EVENT_RXPTRUPD);
        m_cb.rx_ready = true;
        if (m_cb.use_rx && m_cb.buffers_needed)
        {
            m_cb.buffers_reused = true;
        }
    }

    if (nrf_i2s_event_check(NRF_I2S, NRF_I2S_EVENT_STOPPED))
    {
        nrf_i2s_event_clear(NRF_I2S, NRF_I2S_EVENT_STOPPED);
        nrf_i2s_int_disable(NRF_I2S, NRF_I2S_INT_STOPPED_MASK);
        nrf_i2s_disable(NRF_I2S);

        // When stopped, release all buffers, including these scheduled for
        // the next transfer.
        m_cb.handler(&m_cb.current_buffers, 0);
        m_cb.handler(&m_cb.next_buffers, 0);

        m_cb.state = NRFX_DRV_STATE_INITIALIZED;
        NRFX_LOG_INFO("Stopped.");
    }
    else
    {
        // Check if the requested transfer has been completed:
        // - full-duplex mode
        if ((m_cb.use_tx && m_cb.use_rx && m_cb.tx_ready && m_cb.rx_ready) ||
            // - TX only mode
            (!m_cb.use_rx && m_cb.tx_ready) ||
            // - RX only mode
            (!m_cb.use_tx && m_cb.rx_ready))
        {
            m_cb.tx_ready = false;
            m_cb.rx_ready = false;

            // If the application did not supply the buffers for the next
            // part of the transfer until this moment, the current buffers
            // cannot be released, since the I2S peripheral already started
            // using them. Signal this situation to the application by
            // passing NULL instead of the structure with released buffers.
            if (m_cb.buffers_reused)
            {
                m_cb.buffers_reused = false;
                // This will most likely be set at this point. However, there is
                // a small time window between TXPTRUPD and RXPTRUPD events,
                // and it is theoretically possible that next buffers will be
                // set in this window, so to be sure this flag is set to true,
                // set it explicitly.
                m_cb.buffers_needed = true;
                m_cb.handler(NULL,
                             NRFX_I2S_STATUS_NEXT_BUFFERS_NEEDED);
            }
            else
            {
                // Buffers that have been used by the I2S peripheral (current)
                // are now released and will be returned to the application,
                // and the ones scheduled to be used as next become the current
                // ones.
                nrfx_i2s_buffers_t released_buffers = m_cb.current_buffers;
                m_cb.current_buffers = m_cb.next_buffers;
                m_cb.next_buffers.p_rx_buffer = NULL;
                m_cb.next_buffers.p_tx_buffer = NULL;
                m_cb.buffers_needed = true;
                m_cb.handler(&released_buffers,
                             NRFX_I2S_STATUS_NEXT_BUFFERS_NEEDED);
            }

        }
    }
}