diff options
| author | Alexander Aring <alex.aring@gmail.com> | 2015-06-16 09:07:43 (GMT) |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2015-06-16 16:55:11 (GMT) |
| commit | 74ed9d98456a7a85c9e041cd17350b8583659adf (patch) | |
| tree | b85903382f10844e2c68f2d3f8d90330c708cb9f /drivers/net/ieee802154 | |
| parent | cbe6234689b07f5d1ecf2281573591ca4211a5cf (diff) | |
| download | linux-74ed9d98456a7a85c9e041cd17350b8583659adf.tar.xz | |
at86rf230: add recommended csma backoffs settings
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@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/net/ieee802154')
| -rw-r--r-- | drivers/net/ieee802154/at86rf230.c | 11 |
1 files changed, 11 insertions, 0 deletions
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); } |