nrfx_err_t nrfx_i2s_next_buffers_set(nrfx_i2s_buffers_t const * p_buffers)
{
NRFX_ASSERT(m_cb.state == NRFX_DRV_STATE_POWERED_ON);
NRFX_ASSERT(p_buffers);
nrfx_err_t err_code;
if (!m_cb.buffers_needed)
{
err_code = NRFX_ERROR_INVALID_STATE;
NRFX_LOG_WARNING("Function: %s, error code: %s.",
__func__,
NRFX_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
if (((p_buffers->p_rx_buffer != NULL)
&& !nrfx_is_in_ram(p_buffers->p_rx_buffer))
||
((p_buffers->p_tx_buffer != NULL)
&& !nrfx_is_in_ram(p_buffers->p_tx_buffer)))
{
err_code = NRFX_ERROR_INVALID_ADDR;
NRFX_LOG_WARNING("Function: %s, error code: %s.",
__func__,
NRFX_LOG_ERROR_STRING_GET(err_code));
return err_code;
}
if (m_cb.use_tx)
{
NRFX_ASSERT(p_buffers->p_tx_buffer != NULL);
nrf_i2s_tx_buffer_set(NRF_I2S, p_buffers->p_tx_buffer);
}
if (m_cb.use_rx)
{
NRFX_ASSERT(p_buffers->p_rx_buffer != NULL);
nrf_i2s_rx_buffer_set(NRF_I2S, p_buffers->p_rx_buffer);
}
m_cb.next_buffers = *p_buffers;
m_cb.buffers_needed = false;
return NRFX_SUCCESS;
}
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]));
}
}
}
}