gnupic: Re: [gnupic] Writing regiter in gpsim
Subject:
Re: [gnupic] Writing regiter in gpsim
From:
Scott Dattalo ####@####.####
Date:
28 Sep 2006 16:40:37 +0100
Message-Id: <451BECD7.5000709@dattalo.com>
Nicolas wrote:
> Hello,
>
> I am trying to modify the value of registers in a command-line session
> of gpsim but without success. I use for e.g. the following command:
> "x 0xF81 0x05"
>
> Note that reading a register works with for example:
> "x 0xF81"
The 'x' command has been deprecated. Check out the command line help:
-----------
gpsim> help x
x examine command -- deprecated
Instead of the using a special command to examine and modify
variables, it's possible to directly access them using gpsim's
expression parsing. For example, to examine a variable:
gpsim> my_variable
my_variable [0x27] = 0x00 = 0b00000000
To modify a variable
gpsim> my_variable = 10
It's also possible to assign the value of register to another
gpsim> my_variable = porta
Or to assign the results of an expression:
gpsim> my_variable = (porta ^ portc) & 0x0f
------------
But, if you want to examine/modify a register I can think of three other
ways than doing it symbolically like above.
1) reg() operator
gpsim> reg(0xf81)
2) ramData[] operator
gpsim> ramData[0xf81]
3) Use the register window.
> I'm using gpsim 0.21.11.
>
> Also PORTE and PORTD are missing for at least the 18F452.
gpsim is case sensitive. Ports D and E are lower case portd and porte.
Also, you may examine individual bits in these ports e.g. portd0. You
may also monitor them with the scope (this has not been documented btw):
gpsim> scope.ch0="portd0"
The quotes are necessary.
Scott
