at86rf215-def.h File Reference

AT86RF215 radio constants and defines. More...

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Macros
#define	AT86RF215_DELAY_BEFORE_TX   ((unsigned)US_TO_RTIMERTICKS(315))
	The delay between radio Tx request and SFD sent 1) transition to TXPREP --> done in prepare(), needed only if CCA is enabled 2) tx_bb_delay --> <3 us for OQPSK 3) tx_proc_delay --> depends on register settings (~10 us) 4) tx_start_delay --> 4 us.
#define	AT86RF215_DELAY_BEFORE_RX   ((unsigned)US_TO_RTIMERTICKS(100))
	The delay between radio Rx request and start listening 1) transition to RX --> 90 us.
#define	AT86RF215_DELAY_BEFORE_DETECT   ((unsigned)US_TO_RTIMERTICKS(20))
	The delay between the end of SFD reception and the radio returning 1 to receiving_packet().
#define	AT86RF215_PHY_OVERHEAD   (3)
	The number of header and footer bytes of overhead at the PHY layer after SFD (1 length + 2 CRC)
#define	AT86RF215_BYTE_AIR_TIME   (32)
	The air time for one byte in microsecond: 1 / (250kbps/8) == 32 us/byte.

Detailed Description

AT86RF215 radio constants and defines.

Required by the Contiki-NG. The file is included by contiki-conf.h

Author

Grega Morano grega.nosp@m..mor.nosp@m.ano@i.nosp@m.js.s.nosp@m.i

Definition in file at86rf215-def.h.

Macro Definition Documentation

AT86RF215_DELAY_BEFORE_DETECT

#define AT86RF215_DELAY_BEFORE_DETECT   ((unsigned)US_TO_RTIMERTICKS(20))

The delay between the end of SFD reception and the radio returning 1 to receiving_packet().

Preamble length is 8 symbols (16 us) + SFD (2 us) = 18 us

Definition at line 73 of file at86rf215-def.h.

AT86RF215_DELAY_BEFORE_RX

#define AT86RF215_DELAY_BEFORE_RX   ((unsigned)US_TO_RTIMERTICKS(100))

The delay between radio Rx request and start listening 1) transition to RX --> 90 us.

The radio drivers are built in a way, that radio must be on during the timeslot (TSCH_CONF_RADIO_ON_DURING_TIMESLOT), so this time could be smaller. The delay is added to compensate the "large" TX_DELAY.

Definition at line 66 of file at86rf215-def.h.

AT86RF215_DELAY_BEFORE_TX

#define AT86RF215_DELAY_BEFORE_TX   ((unsigned)US_TO_RTIMERTICKS(315))

The delay between radio Tx request and SFD sent 1) transition to TXPREP --> done in prepare(), needed only if CCA is enabled 2) tx_bb_delay --> <3 us for OQPSK 3) tx_proc_delay --> depends on register settings (~10 us) 4) tx_start_delay --> 4 us.

However, the current drivers require appx. 240 us delay before TX.

If we put state transition to TXPREP into at86rf215_prepare(), then this time can be reduced for 80us. However, that would disrupt the CSMA ...

Definition at line 56 of file at86rf215-def.h.