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csma_sender: assure preconditions

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This commit is contained in:
Martine Lenders 2016-06-05 14:28:31 +02:00
parent a3f2cdd6ea
commit 90201bfb6e
2 changed files with 7 additions and 0 deletions
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4
sys/include/net/csma_sender.h
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@ -81,6 +81,8 @@ void csma_sender_set_max_backoffs(uint8_t val);
/**
* @brief Sends a 802.15.4 frame using the CSMA/CA method
*
* @pre `dev != NULL`
*
* If the transceiver can (and is configured to) do hardware-assisted
* CSMA/CA, this feature is used. Otherwise, a software procedure is used.
*
@ -103,6 +105,8 @@ int csma_sender_csma_ca_send(netdev2_t *dev, struct iovec *vector,
/**
* @brief Sends a 802.15.4 frame when medium is avaiable.
*
* @pre `dev != NULL`
*
* This function is useful for sending packets without the whole CSMA/CA
* procedure, but *after* ensuring medium is available, that is after a
* successful CCA.

3
sys/net/link_layer/csma_sender/csma_sender.c
View File

@ -16,6 +16,7 @@
* @}
*/
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
@ -138,6 +139,7 @@ int csma_sender_csma_ca_send(netdev2_t *dev, struct iovec *vector,
{
netopt_enable_t hwfeat;
assert(dev);
/* Does the transceiver do automatic CSMA/CA when sending? */
int res = dev->driver->get(dev,
NETOPT_CSMA,
@ -210,6 +212,7 @@ int csma_sender_cca_send(netdev2_t *dev, struct iovec *vector, unsigned count)
{
netopt_enable_t hwfeat;
assert(dev);
/* Does the transceiver do automatic CCA before sending? */
int res = dev->driver->get(dev,
NETOPT_AUTOCCA,