#30 OnFwd no effect when input is variable

[Pavel Petrovic]

Strange enough, the following work correctly:

OnFwd(2, 100)
OnFwd(4, 100)
set w, 2
OnFwd(w, 100)

however this seems not to work:

set w, 4
OnFwd(w, 100)

attached program demonstrates the problem
(attach motors to all 3 ports)

[Pavel Petrovic]

[Nobody/Anonymous]

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Same result with the enhanced firmware.
(thanks you for the news that the shift operations are implemented there already!)

[John Hansen]

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The value 4 is not a valid port or set of ports. When you use a constant, the value OUT_AC (4) is automatically converted into an array of ports containing 0 and 2. If you use a variable with any of the motor commands it MUST be an array containing a list of ports OR it must be a scalar value of OUT_A (0), OUT_B (1), or OUT_C (2).

You should really never use anything other than the OUT_A, OUT_B, OUT_C, OUT_AB, OUT_AC, OUT_BC constants unless you really need to use a variable, in which case you need to follow the guidelines I mentioned above.

John Hansen

[Pavel Petrovic]

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Thank you very much for the explanation, now I see that.