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<?xml-stylesheet type="text/xsl" href="https://devzone.nordicsemi.com/cfs-file/__key/system/syndication/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/" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>nrf51822 and oled ssd1306 without softdevice</title><link>https://devzone.nordicsemi.com/f/nordic-q-a/35454/nrf51822-and-oled-ssd1306-without-softdevice</link><description>Hello 
 SDK12.3, nRF51822 
 I&amp;#39;m trying to interface the ssd1306 the program freezes in function app_twi_perform internal_transaction_cb is not called internal_transaction_in_progress is not reset. 
 if you use the SoftDevice (instead of lfclk_config call</description><dc:language>en-US</dc:language><generator>Telligent Community 13</generator><lastBuildDate>Fri, 15 Jun 2018 14:00:54 GMT</lastBuildDate><atom:link rel="self" type="application/rss+xml" href="https://devzone.nordicsemi.com/f/nordic-q-a/35454/nrf51822-and-oled-ssd1306-without-softdevice" /><item><title>RE: nrf51822 and oled ssd1306 without softdevice</title><link>https://devzone.nordicsemi.com/thread/136393?ContentTypeID=1</link><pubDate>Fri, 15 Jun 2018 14:00:54 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:90e77e51-c7ca-416f-b507-837e0955957f</guid><dc:creator>Plutok Oleg</dc:creator><description>&lt;p&gt;set&amp;nbsp;&lt;span&gt;CLOCK_CONFIG_LF_SRC to 0 in sdk.config.h&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;#define CLOCK_CONFIG_LF_SRC 0&lt;/p&gt;
&lt;p&gt;now everything works !!!!!!&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: nrf51822 and oled ssd1306 without softdevice</title><link>https://devzone.nordicsemi.com/thread/136338?ContentTypeID=1</link><pubDate>Fri, 15 Jun 2018 11:36:42 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:b38475e7-cd0b-4d4f-a7a8-a9d34ecbcabb</guid><dc:creator>Plutok Oleg</dc:creator><description>&lt;p&gt;internal_transaction_cb is not called&lt;br /&gt;internal_transaction_in_progress is not reset&lt;br /&gt;processing infinite loop in&amp;nbsp;app_twi_perform&lt;/p&gt;
&lt;p&gt;while (p_app_twi-&amp;gt;internal_transaction_in_progress)&lt;br /&gt;{&lt;br /&gt;&amp;nbsp; app_sched_execute();&lt;br /&gt;&amp;nbsp; if (user_function)&lt;br /&gt;&amp;nbsp; {&lt;br /&gt;&amp;nbsp; &amp;nbsp; user_function();&lt;br /&gt;&amp;nbsp; }&lt;br /&gt;}&lt;/p&gt;
&lt;p&gt;&lt;span&gt;LF clock use for app_timer&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;&lt;span&gt;&lt;/span&gt;&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: nrf51822 and oled ssd1306 without softdevice</title><link>https://devzone.nordicsemi.com/thread/136331?ContentTypeID=1</link><pubDate>Fri, 15 Jun 2018 11:25:37 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:ca41a35d-73a5-4654-9a1f-df016fcd8ffe</guid><dc:creator>MartinBL</dc:creator><description>&lt;p&gt;Hi,&lt;/p&gt;
&lt;ol&gt;
&lt;li&gt;What do you mean by &amp;#39;freeze&amp;#39;? Is the application hard faulting or is&amp;nbsp;app_twi_perform() just returning an error code?&lt;/li&gt;
&lt;li&gt;Have you stepped through&amp;nbsp;app_twi_perform() with a debugger to pinpoint what line of code is at fault?&lt;/li&gt;
&lt;li&gt;What are you using the LF clock for? Do you need&amp;nbsp;lfclk_config() at all?&lt;/li&gt;
&lt;/ol&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>