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drivers/at86rf215: fix CCA duration

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The standard CCA backoff period is 8 symbols and only differs for
MR-O-QPSK where it is dependent on the chip rate.
This commit is contained in:
Benjamin Valentin 2020-06-22 00:22:35 +02:00 committed by Benjamin Valentin
parent 6f23263503
commit a6db7d56ba
5 changed files with 25 additions and 12 deletions
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3
drivers/at86rf215/at86rf215_fsk.c
View File

@ -423,7 +423,8 @@ static void _set_ack_timeout(at86rf215_t *dev, bool mord4, bool fec)
static void _set_csma_backoff_period(at86rf215_t *dev)
{
dev->csma_backoff_period = AT86RF215_BACKOFF_PERIOD_IN_SYMBOLS * FSK_SYMBOL_TIME_US;
dev->csma_backoff_period = IEEE802154_CCA_DURATION_IN_SYMBOLS * FSK_SYMBOL_TIME_US
+ IEEE802154G_ATURNAROUNDTIME_US;
DEBUG("[%s] CSMA BACKOFF: %"PRIu32" µs\n", "FSK", dev->csma_backoff_period);
}

6
drivers/at86rf215/at86rf215_o-qpsk.c
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@ -314,13 +314,15 @@ static void _set_ack_timeout(at86rf215_t *dev, uint8_t chips, uint8_t mode)
static inline void _set_csma_backoff_period(at86rf215_t *dev, uint8_t chips)
{
dev->csma_backoff_period = AT86RF215_BACKOFF_PERIOD_IN_SYMBOLS * _get_symbol_duration_us(chips);
dev->csma_backoff_period = _get_cca_duration_syms(chips) * _get_symbol_duration_us(chips)
+ IEEE802154G_ATURNAROUNDTIME_US;
DEBUG("[%s] CSMA BACKOFF: %"PRIu32" µs\n", "O-QPSK", dev->csma_backoff_period);
}
static inline void _set_csma_backoff_period_legacy(at86rf215_t *dev)
{
dev->csma_backoff_period = AT86RF215_BACKOFF_PERIOD_IN_SYMBOLS * LEGACY_QPSK_SYMBOL_TIME_US;
dev->csma_backoff_period = (IEEE802154_ATURNAROUNDTIME_IN_SYMBOLS + IEEE802154_CCA_DURATION_IN_SYMBOLS)
* LEGACY_QPSK_SYMBOL_TIME_US;
DEBUG("[%s] CSMA BACKOFF: %"PRIu32" µs\n", "legacy O-QPSK", dev->csma_backoff_period);
}

5
drivers/at86rf215/at86rf215_ofdm.c
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@ -268,8 +268,9 @@ int at86rf215_configure_OFDM(at86rf215_t *dev, uint8_t option, uint8_t scheme)
at86rf215_reg_write(dev, dev->BBC->RG_OFDMPHRTX, scheme);
dev->csma_backoff_period = AT86RF215_BACKOFF_PERIOD_IN_SYMBOLS *
OFDM_SYMBOL_TIME_US;
dev->csma_backoff_period = IEEE802154G_ATURNAROUNDTIME_US
+ IEEE802154_CCA_DURATION_IN_SYMBOLS
* OFDM_SYMBOL_TIME_US;
DEBUG("[%s] CSMA BACKOFF: %" PRIu32 " µs\n", "OFDM",
dev->csma_backoff_period);

6
drivers/at86rf215/include/at86rf215_internal.h
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@ -43,12 +43,6 @@ extern "C" {
/** Default energy detect threshold for CSMA (reset value) */
#define AT86RF215_EDT_DEFAULT (-84) /* dBm */
/**
* This is used to calculate the csma backoff based on the bitrate.
*/
/** 20 symbols is the std period length */
#define AT86RF215_BACKOFF_PERIOD_IN_SYMBOLS (20U)
/**
* Default Parameters for 802.15.4 retransmissions & CSMA
* @{

17
sys/include/net/ieee802154.h
View File

@ -111,7 +111,22 @@ extern "C" {
*
* 802.15.4g, Table 70 (p. 43)
*/
#define IEEE802154G_ATURNAROUNDTIME_US (1 * US_PER_MS)
#define IEEE802154G_ATURNAROUNDTIME_US (1 * US_PER_MS)
/**
* IEEE Std 802.15.4-2020
* Table 11-1—PHY constants: The value is 12 for all other PHYs.
*/
#define IEEE802154_ATURNAROUNDTIME_IN_SYMBOLS (12)
/**
* IEEE Std 802.15.4-2020
* Table 11-1—PHY constants: For all other PHYs¹, the duration of
* 8 symbol periods.
*
* [1] all but MR-O-QPSK
*/
#define IEEE802154_CCA_DURATION_IN_SYMBOLS (8)
/**
* @brief 802.15.4 PHY modes