Logic contention(s) detected in Flex 20x4 driver

*estudiante · Joined: 10 Aug 2015 Posts: 3

good everyone, I'm looking at the code example and the library
http://www.ccsinfo.com/forum/viewtopic.php?t=28268
than PCM but when I simulate in Proteus gives me error.

these are the errors

Logic contention(s) detected on net #00003.
Logic contention(s) detected on net #00001.
Logic contention(s) detected on net #00002.
Logic contention(s) detected on net #00004.

I connect the pins as it says in the library but it gives me error

Ttelmah · Joined: 11 Mar 2010 Posts: 19358

Simple answer - get rid of Proteus.....

Proteus cannot simulate the PIC at all well (a search here will find lots of posts about this).

Problem here is that the PIC pins are used by the driver as if they are tri-state. The driver reprograms the I/O direction, when the R/W line is used, so that the same pin used as an input can also be used as an output. Proteus cannot understand this, so complains.....