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

Question

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

Answer 1

need external power if use more than two motors.

5v alone is not enough need another 5v (external) to the motors