This patch adds support for a new random csma backoffs settings when
going into sleep state. This is recommended according at86rf2xx
datasheets.
Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
drivers/net/ieee802154/at86rf230.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index b839bbd..7e30a45 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -945,10 +945,21 @@ static void
at86rf230_stop(struct ieee802154_hw *hw)
{
struct at86rf230_local *lp = hw->priv;
+ u8 csma_seed[2];
at86rf230_sync_state_change(hw->priv, STATE_FORCE_TRX_OFF);
disable_irq(lp->spi->irq);
+
+ /* It's recommended to set random new csma_seeds before sleep state.
+ * Makes only sense in the stop callback, not doing this inside of
+ * at86rf230_sleep, this is also used when we don't transmit afterwards
+ * when calling start callback again.
+ */
+ get_random_bytes(csma_seed, ARRAY_SIZE(csma_seed));
+ at86rf230_write_subreg(lp, SR_CSMA_SEED_0, csma_seed[0]);
+ at86rf230_write_subreg(lp, SR_CSMA_SEED_1, csma_seed[1]);
+
at86rf230_sleep(lp);
}
--
2.4.1
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