Recent posts to I/O Expander MCP23017https://forge.codesys.com/forge/talk/Runtime/thread/660c3c7987/2020-02-27T16:26:57.863000ZRecent posts to I/O Expander MCP23017I/O Expander MCP230172020-02-27T16:26:57.863000Z2020-02-27T16:26:57.863000Zswitcherhttps://forge.codesys.com/u/switcher/https://forge.codesys.com9fe3f843b0b458a77a9bf6bc8c0ca46003cebd50<div class="markdown_content"><p>Hi,</p>
<p>Please look at this post for a good start:<br/>
l <a class="" href="http://forum.codesys.com/viewtopic.php?f=21&t=5744" rel="nofollow">viewtopic.php?f=21&t=5744</a> l </p>
<p>You have to add this declaration in your device configuration file if you like to use also BeforeWriteOutputs method:</p>
<p>I haven't deep dived in the MCP23017 device datasheet yet. But I saw imediately that you are using wrong device address in your lib. For MCP23017 you have to use 0x20, suppose you have A0-A2 low (usiAddress := 16#20;).</p>
<p>I hope this helps you further.</p>
<p>BR<br/>
Zdenko.</p>
<p><img alt="IMG: Bild" rel="nofollow" src="http://postimg.com/151000/screen-150073.jpg"/></p></div>I/O Expander MCP230172020-02-27T16:26:55.401000Z2020-02-27T16:26:55.401000Znexus161https://forge.codesys.com/u/nexus161/https://forge.codesys.com818e960d24d78d60e20a850d163aec1f88e78b4e<div class="markdown_content"><p>Hello everybody,<br/>
I want to expand the I/Os of the Raspberry with the following IO Expander(MCP23017).<br/>
I have created the „MCP23017.devdesc.xml“ and a libary „MCP23017.library“ file based on an copy of „SRF02.devdesc.xml“ und „I2C_SRF02.library“. </p>
<p>The Rasberry indentify the MCP23017 but I can´t access with Codesys and don´t know why!!<br/>
I think I fail because I didn´t use the right Parameters in “AfterReadInputs” and “BeforeWriteInputs” to activate the chip or port.</p>
<p>I send you some files and hope you can help me!<br/>
Maybe someone worked on MCP23017 and solved my problem already.</p>
<p>thankfully</p>
<p><a class="" href="https://forum.codesys.com//download/file.php?id=663" rel="nofollow">MCP23017.library <span><span>[337.29 KiB]</span></span></a></p>
<p><a class="" href="https://forum.codesys.com//download/file.php?id=662" rel="nofollow">MCP23017.devdesc.xml <span><span>[2.35 KiB]</span></span></a></p></div>