{"id":2301,"date":"2020-12-06T17:10:43","date_gmt":"2020-12-06T16:10:43","guid":{"rendered":"https:\/\/www.pschatzmann.ch\/home\/?p=2301"},"modified":"2020-12-07T02:40:16","modified_gmt":"2020-12-07T01:40:16","slug":"sd-on-an-esp32-using-a-mirco-sd-card-adapter","status":"publish","type":"post","link":"https:\/\/www.pschatzmann.ch\/home\/2020\/12\/06\/sd-on-an-esp32-using-a-mirco-sd-card-adapter\/","title":{"rendered":"Mounting Error using a Mirco SD Card Adapter on an ESP32"},"content":{"rendered":"<h2>Hardware<\/h2>\n<p>I was receiving my ordered <a href=\"https:\/\/www.banggood.com\/3Pcs-Micro-SD-TF-Card-Memory-Shield-Module-SPI-Micro-SD-Adapter-p-1003057.html?rmmds=myorder&amp;cur_warehouse=CN\">SD module<\/a> but I was struggling a bit to connect it to my <a href=\"https:\/\/i2.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2018\/08\/ESP32-DOIT-DEVKIT-V1-Board-Pinout-36-GPIOs-updated.jpg?quality=100&amp;strip=all&amp;ssl=1\">ESP32 via the SPI interface<\/a>.<\/p>\n<ul>\n<li>I double checked the connections to make sure that I was using the right SPI pins, no change!<\/li>\n<li>I reformatted the SD drive again using FAT32. This did not help either!<\/li>\n<\/ul>\n<p>Finally I got it to work when I connected <strong>VCC to 5V<\/strong> instead of 3.3V &#8211; I should have read the spec because it was saying <em>&#8216;Power supply is 4.5V ~ 5.5V, 3.3V voltage regulator circuit board&#8217;!<\/em><\/p>\n<p>Here are the relevant connections:<\/p>\n<table>\n<thead>\n<tr>\n<th>SD<\/th>\n<th>ESP32<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>CS<\/td>\n<td>VSPI-CS0 (GPIO 05)<\/td>\n<\/tr>\n<tr>\n<td>SCK<\/td>\n<td>VSPI-CLK (GPIO 18)<\/td>\n<\/tr>\n<tr>\n<td>MOSI<\/td>\n<td>VSPI-MOSI (GPIO 23)<\/td>\n<\/tr>\n<tr>\n<td>MISO<\/td>\n<td>VSPI-MISO (GPIO 19)<\/td>\n<\/tr>\n<tr>\n<td>VCC<\/td>\n<td>VIN (5V)<\/td>\n<\/tr>\n<tr>\n<td>GND<\/td>\n<td>GND<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Software<\/h2>\n<p>The next challenge was to master the <a href=\"https:\/\/www.arduino.cc\/en\/reference\/SD\">Arduino SD library<\/a>. There are quite a few different implementations out there but I concentrated on the one which comes with the ESP32. On all examples that you find in the Web you get a sketch that writes to the SD and another which reads the data.<\/p>\n<p>I wanted to implement a  <strong>stack<\/strong> that can deal with variable length entries, so I needed to push (write) and pop (read) repeatedly in the same sketch.<\/p>\n<p>It seems that the only reliable way to do this is structure the logic in the following way:<\/p>\n<ul>\n<li>Write (push)\n<ul>\n<li>File file = SD.open(fileName, FILE_WRITE);<\/li>\n<li>file.seek(new position);<\/li>\n<li>file.write(data, len);<\/li>\n<li>file.close();<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><em>I could only see the data after closing the file and changing to read mode!<\/em><\/p>\n<ul>\n<li>Read (pop)\n<ul>\n<li>File file = open(fileName); \/\/ for read<\/li>\n<li>file.seek(last_position);<\/li>\n<li>file.read(data, len);<\/li>\n<li>file.close();<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>It seems that a <strong>read\/write mode<\/strong> where you could do reads and writes at the same time <strong>does not exist<\/strong> (at least not in the ESP32 implementation).<\/p>\n<p>I am looking forward now to do some new projects which rely on a lot of memory&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hardware I was receiving my ordered SD module but I was struggling a bit to connect it to my ESP32 via the SPI interface. I double checked the connections to make sure that I was using the right SPI pins, no change! I reformatted the SD drive again using FAT32. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2308,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[20],"tags":[],"class_list":["post-2301","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Mounting Error using a Mirco SD Card Adapter on an ESP32 - Phil Schatzmann<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pschatzmann.ch\/home\/2020\/12\/06\/sd-on-an-esp32-using-a-mirco-sd-card-adapter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mounting Error using a Mirco SD Card Adapter on an ESP32 - Phil Schatzmann\" \/>\n<meta property=\"og:description\" content=\"Hardware I was receiving my ordered SD module but I was struggling a bit to connect it to my ESP32 via the SPI interface. 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