How get/set a program variable when running robot

[nandojve]

How get/set a program variable when running robot

[MarWit]

Hey @nandojve!

You are right about relevance of sysbus GetSymbolAddress <symbol-name> — you can use that method to acquire address of any symbol located in the .symtab section (pretty much any global symbol for that matter).

$myVarAddress=`sysbus GetSymbolAddress "my_var"`

Now you can read contents of this using appropriate sysbus method, e.g. assuming that variable in question is unsigned int, you could do:

sysbus ReadDoubleWord $myVarAddress

Other methods you would want to use are:

sysbus ReadByte <address> # reads single byte, returns as byte
sysbus ReadWord <address> # reads two bytes, returns as unsigned short
sysbus ReadDoubleWord <address> # reads four bytes, returns as unsigned int
sysbus ReadQuadWord <address> # reads four bytes, returns as unsigned long
sysbus ReadBytes <address> <count> # reads <count> bytes, returns as array of bytes

There are also dual sysbus methods for writes:

sysbus ReadByte <address> <value>
sysbus ReadWord <address> <value>
sysbus ReadDoubleWord <address> <value>
sysbus ReadQuadWord <address> <value>

So, lets assume that my_var is global, unsigned int; the robot test would look something like this:

*** Test Cases ***
Check If my_var Is Equal To Zero
                 Prepare Platform
                 # Store my_var address in Robot variable
${MY_VAR_ADDR}=  Execute Command    sysbus GetSymbolAddress "my_var"
                 # Move simulation by one second forward
                 Execute Command    emulation RunFor "00:00:01"
${MY_VAR}=       Execute Command    sysbus ReadDoubleWord ${MY_VAR_ADDR}
                 Should Be Equal    ${MY_VAR}    0    my_var should be equal to zero