int gnrc_gomach_send(gnrc_netif_t *netif, gnrc_pktsnip_t *pkt, netopt_enable_t csma_enable)
{
assert(netif != NULL);
assert(pkt != NULL);
/* Enable/disable CSMA according to the input. */
netif->dev->driver->set(netif->dev, NETOPT_CSMA, &csma_enable,
sizeof(netopt_enable_t));
gnrc_gomach_set_tx_finish(netif, false);
gnrc_netif_set_tx_feedback(netif, TX_FEEDBACK_UNDEF);
return _gnrc_gomach_transmit(netif, pkt);
}
/**
* @brief Function called by the device driver on device events
*
* @param[in] event type of event
* @param[in] data optional parameter
*/
static void _lwmac_event_cb(netdev_t *dev, netdev_event_t event)
{
gnrc_netif_t *netif = (gnrc_netif_t *) dev->context;
if (event == NETDEV_EVENT_ISR) {
msg_t msg;
msg.type = NETDEV_MSG_TYPE_EVENT;
msg.content.ptr = (void *) netif;
if (msg_send(&msg, netif->pid) <= 0) {
LOG_WARNING("WARNING: [LWMAC] gnrc_netdev: possibly lost interrupt.\n");
}
}
else {
DEBUG("gnrc_netdev: event triggered -> %i\n", event);
switch (event) {
case NETDEV_EVENT_RX_STARTED: {
LOG_DEBUG("[LWMAC] NETDEV_EVENT_RX_STARTED\n");
gnrc_netif_set_rx_started(netif, true);
break;
}
case NETDEV_EVENT_RX_COMPLETE: {
LOG_DEBUG("[LWMAC] NETDEV_EVENT_RX_COMPLETE\n");
gnrc_pktsnip_t *pkt = netif->ops->recv(netif);
/* Prevent packet corruption when a packet is sent before the previous
* received packet has been downloaded. This happens e.g. when a timeout
* expires that causes the tx state machine to send a packet. When a
* packet arrives after the timeout, the notification is queued but the
* tx state machine continues to send and then destroys the received
* packet in the frame buffer. After completion, the queued notification
* will be handled a corrupted packet will be downloaded. Therefore
* keep track that RX_STARTED is followed by RX_COMPLETE.
*
* TODO: transceivers might have 2 frame buffers, so make this optional
*/
if (pkt == NULL) {
gnrc_netif_set_rx_started(netif, false);
break;
}
gnrc_netif_set_rx_started(netif, false);
if (!gnrc_mac_queue_rx_packet(&netif->mac.rx, 0, pkt)) {
LOG_ERROR("ERROR: [LWMAC] Can't push RX packet @ %p, memory full?\n", pkt);
gnrc_pktbuf_release(pkt);
break;
}
lwmac_schedule_update(netif);
break;
}
case NETDEV_EVENT_TX_STARTED: {
gnrc_netif_set_tx_feedback(netif, TX_FEEDBACK_UNDEF);
gnrc_netif_set_rx_started(netif, false);
break;
}
case NETDEV_EVENT_TX_COMPLETE: {
gnrc_netif_set_tx_feedback(netif, TX_FEEDBACK_SUCCESS);
gnrc_netif_set_rx_started(netif, false);
lwmac_schedule_update(netif);
break;
}
case NETDEV_EVENT_TX_NOACK: {
gnrc_netif_set_tx_feedback(netif, TX_FEEDBACK_NOACK);
gnrc_netif_set_rx_started(netif, false);
lwmac_schedule_update(netif);
break;
}
case NETDEV_EVENT_TX_MEDIUM_BUSY: {
gnrc_netif_set_tx_feedback(netif, TX_FEEDBACK_BUSY);
gnrc_netif_set_rx_started(netif, false);
lwmac_schedule_update(netif);
break;
}
default:
LOG_WARNING("WARNING: [LWMAC] Unhandled netdev event: %u\n", event);
}
}
/* Execute main state machine because something just happend*/
while (gnrc_lwmac_get_reschedule(netif)) {
lwmac_update(netif);
}
}
