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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>UAER Printf shows noting using nRF52840 dongle and a USB to TTL module (Arduino Uno as the USB to TTL)</title><link>https://devzone.nordicsemi.com/f/nordic-q-a/89398/uaer-printf-shows-noting-using-nrf52840-dongle-and-a-usb-to-ttl-module-arduino-uno-as-the-usb-to-ttl</link><description>Hello, 
 
 I am trying to send &amp;quot;Hello&amp;quot; through the UART and the nrf52840 dongle using a USB to TTL approach. The main.c code and the sdk_confg.h are uploaded here. The problem is that neither printf nor the NRF_LOG_INFO command shows nothing at the serial</description><dc:language>en-US</dc:language><generator>Telligent Community 13</generator><lastBuildDate>Tue, 28 Jun 2022 01:04:07 GMT</lastBuildDate><atom:link rel="self" type="application/rss+xml" href="https://devzone.nordicsemi.com/f/nordic-q-a/89398/uaer-printf-shows-noting-using-nrf52840-dongle-and-a-usb-to-ttl-module-arduino-uno-as-the-usb-to-ttl" /><item><title>RE: UAER Printf shows noting using nRF52840 dongle and a USB to TTL module (Arduino Uno as the USB to TTL)</title><link>https://devzone.nordicsemi.com/thread/374425?ContentTypeID=1</link><pubDate>Tue, 28 Jun 2022 01:04:07 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:a34d8da2-7bdd-4d7e-b30a-6030f5f9a20a</guid><dc:creator>AbbaS7</dc:creator><description>&lt;p&gt;It &lt;strong&gt;solved&lt;/strong&gt;!&lt;br /&gt;&lt;br /&gt;The problem was with the rx tx pin definitions &lt;span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile"&gt;&amp;#x1f642;&lt;/span&gt;&lt;/p&gt;
&lt;p&gt;it should be defined something like the following:&lt;br /&gt;&lt;br /&gt;&lt;pre class="ui-code" data-mode="c_cpp"&gt;    #define rx_pin_no 29
    #define tx_pin_no 31
    #define rts_pin_no 45
    #define cts_pin_no 47
    
      const app_uart_comm_params_t com_params = // struct to hold the uart configurations
  {
					rx_pin_no,
					tx_pin_no,
					rts_pin_no,
					cts_pin_no,
					UART_HWFC, // hardware flow control disabled
					false, // parity = none
					NRF_UART_BAUDRATE_115200 // set this baud rate for communication

  };&lt;/pre&gt;&lt;/p&gt;
&lt;p&gt;&lt;/p&gt;
&lt;p&gt;Bests,&lt;/p&gt;
&lt;p&gt;Abbas&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>