GPIO with Pull-up resistor, output Low-level problem

Felix Zhang

Hi,

I'm using F28035 GPIO22 (set as GPIO already) with a 10k pull-up resistor (to 3.3v).

When it executes "GpioDataRegs.GPASET.bit.GPIO22 = 1;" there is no problem, but when it goes to 'GpioDataRegs.GPACLEAR.bit.GPIO22 = 1;', I test the GPIO22 Pin, the 3.3v High-level do not go to Low-level, but stay at about 2.9v... and the program (code) stops at "ESTOP0"...

I test it only with the pull-up resistor, there is no other connections; anyone may help me?

Thanks!

Regards,

Felix

over 13 years ago

0 Manoj Santha Mohan over 13 years ago

TI__Guru 55700 points

Please try the GPIO_TOGGLE example in 2803x C/C++ Header Files and Peripheral Examples. I would also suggest you to remove the 10K pull resistor and check whether the problem goes away? Also, I don't understand how the execution goes to ESTOP0. Can you send us your code to better help you.

-Manoj

0 Felix Zhang over 13 years ago in reply to Manoj Santha Mohan

Intellectual 645 points

Hi Manoj,

Thank for your help.

This problem has been solved, it is because the mcu power supply (3.3v) can't provide enough power for the circuits, when the GPIO output low level, it can't afford so leads to reset, the execution went to ESTOP0.

Thank you again for your suggestions.

Best regards,

Felix

C2000™︎ microcontrollers

C2000 microcontrollers forum

GPIO with Pull-up resistor, output Low-level problem