{"id":1394,"date":"2025-04-10T11:49:20","date_gmt":"2025-04-10T11:49:20","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&#038;p=1394"},"modified":"2025-04-28T08:17:29","modified_gmt":"2025-04-28T08:17:29","slug":"hmi430-700-nvem1-read-write","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/product-documentation\/product-documentation-controllers\/hmi430-700-product-documentation\/hmi430-700-non-volatile-memory\/hmi430-700-nvem1-read-write\/","title":{"rendered":"HMI430\/700: NVEM1 (Read\/Write)"},"content":{"rendered":"\n<p>NVEM Page 1 is both readable and writable.&nbsp; It has 3968 bytes of storage space and a typical write endurance of 500,000 cycles per individual byte.&nbsp; There&#8217;s no limit on the number of times you can read from it.&nbsp; The system is smart enough to know if a write is writing the same data and will avoid performing a write in such cases.<\/p>\n\n\n\n<p>NVEM1 cannot be written to by SPLat\/PC, so you can&#8217;t have an preloaded data in your source code like NVEM0.&nbsp; It can only be written to by your running application.&nbsp; Hence it is most useful for storing configuration information, or for logging a small amount of data.<\/p>\n\n\n\n<p>Loading a new application into the HMI430 will not erase anything you&#8217;ve stored in NVEM1.&nbsp; There&#8217;s no automatic way to know if you have already written something to NVEM1, so be sure to implement some sort of checksum or flag.<\/p>\n\n\n\n<p>At power on, when your application starts, NVEM defaults to page 0.\u00a0 Therefore to access NVEM1 you must call the\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/non-volatile-memory\/nvsetpage-nn-d15\/\">NVSetPage<\/a>\u00a0instruction.<\/p>\n\n\n\n<p>For example, store the number 42 in NVEM1 @ address 10:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><br>   NVSetPage   1     ;ensure we're using NVEM1<br>   NVSetPtr    0     ;set the ptr to start of NVEM1<br>   NVSetRecLen 0     ;not using records<br>   NVSetRecNum 0     ;not using records<br>   LoadX       42    ;the number we're going to write<br>   NVPopByte   10    ;write the byte to location 10<br><br><\/pre>\n\n\n\n<p>Here is a\u00a0<a href=\"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/programming-reference\/instructions-arranged-by-function\/non-volatile-memory\/\">full list of NVEM instructions<\/a>.<\/p>\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>NVEM Page 1 is both readable and writable.&nbsp; It has 3968 bytes of storage space and a typical write endurance of 500,000 cycles per individual&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1390,"menu_order":3,"template":"","class_list":["post-1394","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - 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