Activate Motor & Activate Buzzer & Motor crash

GTT TFT Support

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deanhuff1
LCD!
Posts: 18
Joined: Thu Sep 06, 2018 5:28 pm

Activate Motor & Activate Buzzer & Motor crash

Post by deanhuff1 » Thu Sep 27, 2018 10:58 am

Using commands "254 183" and "254 160" repeatedly (with 30-150 millisecond gaps) is causing my GTT29A to crash. Any ideas? "254 183" crashes right away on the first call and causes a reload. "254 160" takes several calls (usually less than a dozen) to crash.

Also on an unrelated note. GTT Designer is able to reset out of "Mass Storage Mode". What are the commands that it sends to do that? I tried just a simple reset command when in disk mode and nothing happened.

thanks
-Dean

Daniel Divino
Matrix Orbital
Matrix Orbital
Posts: 176
Joined: Thu Sep 24, 2015 9:38 am

Re: Activate Motor & Activate Buzzer & Motor crash

Post by Daniel Divino » Thu Sep 27, 2018 4:11 pm

Hi Dean,

Activating both the motor and the buzzer at the same time causes a dramatic increase in current draw, which can cause the display to reset if not enough current is available. The GTT can draw as much as 650mA when the motor and buzzer are running simultaneously so I suggest that you double check your supply to make sure it can supply enough power to the display.

Normally the GTT won't be able to receive commands when it's in mass storage mode, as all of the communication ports on the board are ignored other than the Mass Storage header itself. The GTT Designer is able to send a command through the USB stack to the display which will kick the display out of Mass Storage mode. I'll talk to our Software Designer Ray about the bytes that need to be sent, and I'll update you tomorrow

Cheers,
Daniel
Daniel Divino
Technical Support
Matrix Orbital

deanhuff1
LCD!
Posts: 18
Joined: Thu Sep 06, 2018 5:28 pm

Re: Activate Motor & Activate Buzzer & Motor crash

Post by deanhuff1 » Thu Sep 27, 2018 9:31 pm

That makes sense. I'm powered only by the USB right now. For a test, I'll try to wire up the power supply using a floppy header off a computer power supply and see if it fares better.

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