^22 - The Task Start Port

This port is a read only value of the last way a task on the device was started.

Syntax

LDA ^22,x
Where x is the task number (base 0) that you want to know how it last started.
LDA ^22,0 is task 1.
LDA ^22,1 is task 2.
LDA ^22,255 is the requesting task.

^22 Task Start port responses
Response	Source Description
0x00	Don’t Know
0x01	Started by another task
0x02	Started by an event
0x03	Physical OpCode 0x10 message From Port 1 (Spur)
0x04	Physical OpCode 0x10 message from Port 2 (Trunk)
0x05	Started by a Button
0x06	Started by a Dry Contact
0x07	Started by an Aux Input
0x08	Started by a Start() message trigger
0x09	Started by a tamper switch action
0x0a	Started by an on-motion action
0x0b	Started by a on-no-motion action
0x0c	Is the Startup Task
0x0d	Started by crossing a Lux Threshold
0x0e	Started by an IR Button action
0xFF	Task does not exist

Port ^16,0 will tell you what port the logical messages was received on that triggered a Start() command. 0x00=Internal, 0x02=Spur, 0x05=Trunk

Example

Using the port to communicate where it triggered from.

Task1()
{
Start(A=100,P=1)    //Start on P1 for A100
LDA ^22,255         //Load what started the task
BRZ DontKnow
CMP #0x01           //Local trigger from StartTask command?
BRZ OtherTask
CMP #0x03           //External trigger using 0x5c opcode 0x10?
BRZ PhysicalMSG
CMP #0x05           //Started by button press?
BRZ ButtonPress
CMP #0x08           //Logical trigger using Start() command?
BRZ StartCommand
Null
StartCommand:
    LDA ^16,0       //Load where the message came from
    BRZ DyNetMute   //If 0 it was an internal message from TX command
    CMP #0x02       //Was it from the spur?
    BRZ SpurMsg
    CMP #0x05       //Was it from the trunk?
    BRZ TrunkMsg
    Null
    ...
}