Is there a way to send these 2 commands together?

Don M · 2011-08-17 11:38

I have these 2 lines:

txmdbinv($1_08, MDB_MSTR)
txmdbinv($0_08, MDB_MSTR)

Can they be combined somehow in one line to send both the $1_08 & $0_08 together? What is the syntax to do so?

Thanks.
Don

Phil Pilgrim (PhiPi) · 2011-08-17 11:46

I think we need a little more context here. First of all, where does txmdbinv live, and what does it do? Second, $1_08 is not a byte value.

-Phil

Don M · 2011-08-17 11:55

Phil- Please excuse my ignorance here but I guess I don't know how to ask this properly.

txmdbinv lives in the initial cog I believe. It is a pub method in my main object. In another program I have I am able to send these 2 "commands" I'll call them, with this line of code:

txmdb(($1_00) | MDB_ACK,MDB_SLAV)

MDB_ACK = $00. MDB_SLAV is a pin.

I tried to do this in my code but it doesn't work: txmdbinv(($1_08) | $08, MDB_MSTR)

Phil Pilgrim (PhiPi) · 2011-08-17 12:13

The "|" operator is a bitwise OR. It doesn't produce two different parameters, just one: in your case $1_08. If you want your routine to accept more than one command at a time, it needs to be set up to accept the address of a word array, and you need a way to tell it how many active commands are in the array. This can be done either by a unique terminator or by a separate parameter that gives the command count.

-Phil

Don M · 2011-08-17 12:16

So here's what I am trying to explain.

With this code:

  txmdbinv($1_08, MDB_MSTR)
  txmdbinv($0_08, MDB_MSTR)

I get this as an output:

Is there a way to combine both of those lines of code into 1?

Phil Pilgrim (PhiPi) · 2011-08-17 12:22

Short answer: no. Not without modifying txdbinv as I explained above.

-Phil

Don M · 2011-08-17 12:23

Phil- Thanks.

StefanL38 · 2011-08-17 13:31

without knowing more details I can't help

Questions:

how many propeller-IO-pins do you use to transfer the commands?

What kind of interface is this SPI?, Serial?, I2C? something else?

please attach your complete code to a posting.

best regards

Stefan

Don M · 2011-08-17 15:36

I didn't realize this would be as difficult as it seems to be. My ignorance here...

It involves only 1 IO pin and it is serial. It isn't that important that it be condensed. I was just curious as I had seen it work in another program I have with similar conditions.

StefanL38 · 2011-08-17 23:00

I didn't realize this would be as difficult as it seems to be. My ignorance here...

It involves only 1 IO pin and it is serial. It isn't that important that it be condensed. I was just curious as I had seen it work in another program I have with similar conditions.

So what does this mean? Do you stop working on this?
keep the questions coming
best regards

Stefan

Don M · 2011-08-18 07:02

Yes. I can live with the individual statements for now. They work fine.

JonnyMac · 2011-08-18 08:34

You can't use the string() method with 9-bit values but you could put your commands into a DAT statement and create a method that iterates through them. Note that you need to terminate the group commands -- I'm using -1 in the example below as 0 may be a valid command in your system.

[b]pub[/b] txmdb_str(pntr) | cmd

  repeat
    cmd := long[pntr]
    if (cmd == -1)
      quit
    else
      txmdbinv(cmd, MDB_MSTR)
      pntr += 4


[b]dat[/b]

Command1        long    $1_08, $0_08, -1

Pass the address of the command string you want to send:

txmdb_str(@Command1)

Is there a way to send these 2 commands together?

Comments