<?xml version="1.0" encoding="UTF-8" ?>
<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>help understanding a few lines of code</title><link>https://community.arm.com/developer/tools-software/tools/f/keil-forum/32950/help-understanding-a-few-lines-of-code</link><description> 
hey so I&amp;#39;m having some trouble understand 3 fairly simple lines of
code configuring some port D pins i know somehow they are supposed to
make pins 0-3 and 8-15 as 2MHz low speed outputs with a pull-up
resistor on pin 0 but after looking thru the c and</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: help understanding a few lines of code</title><link>https://community.arm.com/thread/118496?ContentTypeID=1</link><pubDate>Wed, 07 May 2014 10:29:40 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:406eec59-9c18-4895-9069-91cc753f9469</guid><dc:creator>Westonsupermare Pier</dc:creator><description>&lt;p&gt;&lt;p&gt;
RM0090 Rev 6&lt;br /&gt;

&lt;a href="http://www.st.com/web/en/resource/technical/document/reference_manual/DM00031020.pdf"&gt;www.st.com/.../DM00031020.pdf&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;
Well there&amp;#39;s the whole of Chapter 8, about GPIO&lt;/p&gt;

&lt;p&gt;
And this section 8.4 &amp;quot;GPIO Registers&amp;quot; bit around page 278 that
would appear particularly salient.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: help understanding a few lines of code</title><link>https://community.arm.com/thread/120317?ContentTypeID=1</link><pubDate>Wed, 07 May 2014 09:31:07 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:9d0fe848-0887-462d-a4f1-8c3fbc83358f</guid><dc:creator>ImPer Westermark</dc:creator><description>&lt;p&gt;&lt;p&gt;
Someone who haven&amp;#39;t worked with this processor before might even
suspect that maybe a search for &amp;quot;OSPEEDR&amp;quot; in such a processor
datasheet/user manual might actually find some nice paragraph or
table that does describe the meaning of such a register.&lt;/p&gt;

&lt;p&gt;
It isn&amp;#39;t dangerous to spend a bit of time looking through the
documentation that the chip vendors spends quite a lot of time
writing.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: help understanding a few lines of code</title><link>https://community.arm.com/thread/107670?ContentTypeID=1</link><pubDate>Wed, 07 May 2014 09:26:26 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:c1b613c4-f0b0-4418-9ea0-f3968a8f4deb</guid><dc:creator>&amp;#178;erik malund</dc:creator><description>&lt;p&gt;&lt;p&gt;
from the post above &lt;i&gt;there will be a section describing the GPIO
peripheral registers&lt;/i&gt;&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: help understanding a few lines of code</title><link>https://community.arm.com/thread/81873?ContentTypeID=1</link><pubDate>Wed, 07 May 2014 08:57:15 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:79c80fd5-b4a3-4bfd-a86f-b011de6ac2e8</guid><dc:creator>Russ Ltz</dc:creator><description>&lt;p&gt;&lt;p&gt;
yes STM32F4&lt;br /&gt;
and which section would you recommend?&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: help understanding a few lines of code</title><link>https://community.arm.com/thread/62799?ContentTypeID=1</link><pubDate>Wed, 07 May 2014 08:52:42 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:6826b0a7-2713-40eb-9c62-acafa9134964</guid><dc:creator>Westonsupermare Pier</dc:creator><description>&lt;p&gt;&lt;p&gt;
Let me guess, some STM32 series part?&lt;/p&gt;

&lt;p&gt;
Ok, figure out what part you&amp;#39;re using and download a copy of the
Reference Manual for it, there will be a section describing the GPIO
peripheral registers, and the bit settings thereof.&lt;/p&gt;
&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>