• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 594 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Disabling the switch on the TMS570 HDK

Sam Poyser
Prodigy 10 points

Hi,

I'm currently working with a TMS HDK which has a push-button switch hard-wired to pin GIOA7. My project needs all the GIO pins on the board, and having the switch there means it is constantly driven high, ignoring any changes I make through the software. I'm sure the solution is trivial, but I absolutely cannot see it.

Thanks in advance,

S

  • 0
    TI__Guru 72500 points

    You did not mention which TMS570 HDK you are using. If it is the TMS570LS31x HDK, the schematic is here: GIOA7 is connected to 3.3V through a 10K Ohm resistor. It is shorted to ground when S1 is pushed. You should be able to make GIOA7 an output and drive it low with no problem. Driving it high is only a problem if someone pushes the S1 button, that would short the output pin to ground and might damage the output buffer. You can isolate GIOA7 from S1 by removing R158.