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1461

RF Core HAL

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23.3.2.5.1 Triggers

Triggers can be used to set up a start time, or for other specific purposes in specific radio operation

commands. A common trigger byte definition exists, defined in Table 23-3.

Table 23-3. Format of Trigger Definition Byte

Bit Field Description

0–3 triggerType The type of trigger

0: No alternative trigger command.

4 bEnaCmd

1: CMD_TRIGGER can be used as an alternative trigger

5–6 triggerNo The trigger number of the CMD_TRIGGER command that triggers this action

0: A trigger in the past is never triggered, or for start of commands, give an error

7 pastTrig

1: A trigger in the past is triggered as soon as possible

The triggerType can take the values listed in Table 23-4. Other values are reserved.

Table 23-4. Supported Trigger Types

Number Name Description

0 TRIG_NOW Now (not applicable to end triggers)

1 TRIG_NEVER Never (except possibly by CMD_TRIGGER if bEnaCmd = 1)

2 TRIG_ABSTIME At absolute time, given by timer parameter

3 TRIG_REL_SUBMIT At a time relative to the time the command was submitted

4 TRIG_REL_START At a time relative to start of this command (not allowed for start triggers)

5 TRIG_REL_PREVSTART At a time relative to the start of the previous command

6 TRIG_REL_FIRSTSTART At a time relative to the start of the first command of the chain

7 TRIG_REL_PREVEND At a time relative to the end of the previous command

At a time relative to event #1 of the previous command (see definition

8 TRIG_REL_EVT1

below)

At a time relative to event #2 of the previous command (see definition

9 TRIG_REL_EVT2

below)

10 TRIG_EXTERNAL On an external trigger input to the RAT

A 32-bit time parameter is used together with all triggers except for TRIG_NOW and TRIG_NEVER.

Absolute timing uses the value of the 32-bit radio timer. Relative timing uses the number of radio timer

ticks. The external trigger uses an identifier of source and edge as defined in Table 23-5.

Table 23-5. Fields of Time Parameter for External Event

Trigger

Bits Field Description

0–1 Reserved

Input mode

00: Rising edge

2–3 inputMode 01: Falling edge

10: Both edges

11: Reserved

4–7 Reserved

8–12 Reserved

13–31 Reserved

1462

Radio SWCU117A–February 2015–Revised March 2015

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