What does variable RR do in the standard template?
What does variable RR do in the standard template?
by stuuk
Mon May 05, 2008 11:19 pm
Hi All
I don't understand what the variable RR does in the standard template.
It is declared as a byte, and only ever assigned the value of 0
It is obviously something to do with the remote but no other value other than 0 is ever written to it so all the code around this seems redundent to me.
Am I missing something?
Thanks
Stu
I don't understand what the variable RR does in the standard template.
It is declared as a byte, and only ever assigned the value of 0
It is obviously something to do with the remote but no other value other than 0 is ever written to it so all the code around this seems redundent to me.
Am I missing something?
Thanks
Stu
by i-Bot
Mon May 05, 2008 11:38 pm
The significance of RR is that it is the first defined variable and sits at the bottom of the variables RAM.
If a serial character is received over the serial cable, the character is placed in this first variable location provided it is less than &H80, Values higher than &H80 are used for communicating between PC and C3024.
There are a few errors now found in this document, but it shows the principle.
http://web.ukonline.co.uk/r.ibbotson/fi ... Serial.pdf
Typically bluetooth is used instead on the ETX and ERX, so the RR code can be removed of not used.
I tend keep the first variable unused, since it can be overwritten in this way.
If a serial character is received over the serial cable, the character is placed in this first variable location provided it is less than &H80, Values higher than &H80 are used for communicating between PC and C3024.
There are a few errors now found in this document, but it shows the principle.
http://web.ukonline.co.uk/r.ibbotson/fi ... Serial.pdf
Typically bluetooth is used instead on the ETX and ERX, so the RR code can be removed of not used.
I tend keep the first variable unused, since it can be overwritten in this way.
