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

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

[SYED AFDAR syed]

need external power if use more than two motors.

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

Answer 2

[Scott Huang]

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

[SYED AFDAR syed]

i have tried your solution. but it turned out the same. still getting those erorrs.

[Scott Huang]

you also need to update the same setting some where in the "code"

I couldn't find what is the maximum allowed baud rate in the serial port setting, but I think this is the limit of your system.

another case reported that 3rd party arduino board may not support high baud rate because of the chip, maybe this is the root cause for your case.

[SYED AFDAR syed]

i will try my best to solve it.

Thanks Scott

appreciatte it!

Answer 3

[SYED AFDAR syed]

i have solved it.

thanks

[Prajwal Thakur]

how did you solve this ???

Answer 4

[Félix Bertrand]

How? Please, i have the same problem