LPC MicrocontrollersのトピックDefault (initial) output value on GPIO2

Default (initial) output value on GPIO2

lpcware — Wed, 15 Jun 2016 18:09:08 GMT

Content originally posted in LPCWare by satyendra_sss on Thu Mar 03 00:28:58 MST 2016
Hi,
I was wondering if there is a way to set the initial value of a GPIO pin to be configured as output pin to high(or low).
I am using GPIO2.0 of lpc1769 for switching a relay using a PNP switch.
Whenever I configure the pin as output, the switch gets turned on immediately. I am assuming this happens since the GPIO pin goes low the moment I configure it as an output pin.

Thanks and Regards,
SSS

Re: Default (initial) output value on GPIO2

lpcware — Wed, 15 Jun 2016 18:09:08 GMT

Content originally posted in LPCWare by R2D2 on Thu Mar 03 01:07:15 MST 2016

Quote: satyendra_sss
I am assuming this happens since the GPIO pin goes low the moment I configure it as an output pin.

:quest:

Then debug your code to see which value this pin has before you change it to output...

Default is HIGH :O

Re: Default (initial) output value on GPIO2

lpcware — Wed, 15 Jun 2016 18:09:09 GMT

Content originally posted in LPCWare by wmues on Thu Mar 03 01:59:59 MST 2016
You are allowed to set the value of a GPIO _before_ you switch the direction to Output.

Re: Default (initial) output value on GPIO2

lpcware — Sun, 19 Jun 2016 01:03:44 GMT

bump