LPC1778 unable to use P5_3 as an output

[lpcware]

Content originally posted in LPCWare by gvd@mgb-tech.com on Fri Dec 18 02:33:47 MST 2015
Hello,

It seems to be impossible to use pin P5_3 as an output.
Although I haven't found anything in the datasheet/user manual that confirms this.

This Pin is of the special I type and linked to the I2C functionality but it can be configured as a standard GPIO pin.
The I type pins can not select the GPIO mode setting (pull-up, pull-down, ...) but I assumed it could be used as a standard output pin.
Which seems to be impossible.

Anyone who has an explanation?
Or am I still missing something.

Gerrit

[lpcware]

Content originally posted in LPCWare by gvd@mgb-tech.com on Fri Dec 18 09:53:31 MST 2015
Sorry duplicate entry

[lpcware]

Content originally posted in LPCWare by gvd@mgb-tech.com on Fri Dec 18 09:28:04 MST 2015
Indeed

Thanks Serge

I'll go home and weep for the weekend

[lpcware]

Content originally posted in LPCWare by serge on Fri Dec 18 08:09:12 MST 2015
The datasheet tells us that P5_3 is an open drain..... forgot the external pullup?