Need help with FullDulexSerial coding ...

JMLStamp2p

I am trying to send an "AT" command to another chip from the Propeller with the code below; I must be overlooking something simple. Is my serial.str( ) command formatted wrong? If I wanted to append a Carrage return command after the AT command as well should would I just add a /r outside the parenthesis?
Thanks for any help that you give,
JMLStamp2p

_______________________________________________________________________________________________
CON
_clkmode = xtal1 + pll16x
_xinfreq = 5_000_000 'Sets Clock Mde for 80 MHz

VAR
long rXdata 'Declares Local Varibles
long tXdata

OBJ
serial : "FullDuplexSerial" 'Includes access to the FullDuplexSerial Functions via the term"serial"

PUB MAIN

serial.start(31, 30, 0, 115200) 'Sets up Serial Baud rate and Pins
serial.rxFlush 'Flush Input Buffer
serial.str ("AT") 'Send AT command out pin 30 to SIMCOM900

StefanL38

Hi JML,

write

  serial.str(string("AT",13))

instead of

  serial.str ("AT")

SPIN can handle only bytes, words, longs directly

a string must be transformed into a bytesequence which is terminated by value zero

the command serial.str(string("AT",13)) stores the bytesequence decimal values 65,84,13,0 somewhere in the HUB-RAM and
passes the HUB-RAM-ADRESS to the method "str"

If you want to use strings with a variable content you have to define a byte-array
and always have to pass the ADRESS of the bytearray by using the "@"-operatot

best regards

Stefan

JMLStamp2p

Stefan, thank you very much for takng time to aswer. Where is he bes tplace I can go to learn the nuts and bolts of Propeller code?
JMLtamp2p

John Michael

Stefan, I didn't see a "CTL" ASCII equivelent unless it is "17". I am trying to end the coding by a "CTL & Z" command. Should I use something like this ...

serial.str(string(17,90,0)) 'Send the Equivelent of CTL & Z

!outa[10] 'Flash LED when Completed.
waitcnt(Wait_Cycles + cnt)

JMLStamp2p

John Michael

Or maybe like this ?
serial.str(string(26,43,90,0))

JMLStamp2p

Mike Green

You can't have a zero byte in a string because that's used to mark the end of the string. If you need to transmit a zero byte, use serial.tx(0)

John Michael

Mike, how would be the Correct way to code a "CTL+Z" to Transmit out pin 30 to another chip using "AT" commands? Not sure how to ...
Thanks for your Help,
JMLStamp2p

Mike Green

CTRL-Z has nothing to do with "AT" commands. When you hold down the Control key on a keyboard, the upper 3 bits of the 8 bit byte are forced to zeros. CTRL-@ becomes a zero byte. CTRL-A becomes a $01, CTRL-Z becomes a $1A. CTRL-"]" becomes $1D, etc. To transmit CTRL-Z, you'd use serial.tx($1A). Rather than figuring out what's CTRL for every character, you can just do something like serial.tx("Z"&$1F) which forces the upper 3 bits of the character to zeros.