Error occurred while executing External Mode MEX-file 'ext_comm': ExtTargetPktPending() call failed while checking for target pkt

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hi,
whenever i put 5 servos blocks in simulink, it keeps crashing and this error comes out:
Error occurred while executing External Mode MEX-file 'ext_comm':
ExtTargetPktPending() call failed while checking for target pkt
. i'm using arduino mega 2560
5 flex sensors
5 servo motors
windows 10 64-bit.
matlab 2017b
but if only one servo block used then it will not crash.
i see many people have this problem. and it still does not solve.
we pay for matlab and all staffs for education and work.
please help us or me solve it
if it is not important, we won't ask.
regards
Help please

Accepted Answer

SYED AFDAR syed
SYED AFDAR syed on 14 Jan 2019
need external power if use more than two motors.
5v alone is not enough need another 5v (external) to the motors

More Answers (3)

Scott Huang
Scott Huang on 11 Jan 2019
Edited: Scott Huang on 11 Jan 2019
Hi
you can try this: set your baud rate to 921600. Probably your baud rate is below this value. This solved my same problem.
codertarget.arduinobase.registry.setBaudRate('mdl',921600)
mdl = your model name
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SYED AFDAR syed
SYED AFDAR syed on 14 Jan 2019
i have solved it.
thanks

Félix Bertrand
Félix Bertrand on 24 Jan 2019
How? Please, i have the same problem

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