{"id":3168,"date":"2025-01-18T14:09:31","date_gmt":"2025-01-18T14:09:31","guid":{"rendered":"https:\/\/blog.embeddedexpert.io\/?p=3168"},"modified":"2025-01-18T14:16:22","modified_gmt":"2025-01-18T14:16:22","slug":"building-a-library-for-1602-lcd-with-stm32f4-features-connections-and-initialization-part-1","status":"publish","type":"post","link":"https:\/\/blog.embeddedexpert.io\/?p=3168","title":{"rendered":"Building a Library for 1602 LCD with STM32F4: Features, Connections, and Initialization (Part 1)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d.webp\" alt=\"\" class=\"wp-image-3169\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d.webp 1024w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d-300x300.webp 300w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d-150x150.webp 150w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d-768x768.webp 768w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d-750x750.webp 750w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d-400x400.webp 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/163ed22b-34cb-4106-8f7e-38582ecf4e4d-250x250.webp 250w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>This guide is part one of a two-part series that explains how to interface a 1602 Liquid Crystal Display (LCD) module with the HD44780 driver to an STM32F4 microcontroller. In this part, we focus on the LCD features, hardware connections, and STM32CubeMX initialization.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>In this guide, we shall cover the following:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Feature of 1602 display.<\/li>\n\n\n\n<li>Connection.<\/li>\n\n\n\n<li>STM32CubeMX Initialization.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">1. Feature of 1602 Display:<\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>The Liquid Crystal 1602 is a versatile and widely used display module, ideal for embedded systems and microcontroller projects. Here are its standout features:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Display Format<\/strong>:\n<ul class=\"wp-block-list\">\n<li>2 rows \u00d7 16 characters (total 32 characters).<\/li>\n\n\n\n<li>Character size of 5&#215;8 or 5&#215;10 dots.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Driver IC<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Equipped with the HD44780 controller, enabling easy interfacing with most microcontrollers.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Interface<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Supports both 4-bit and 8-bit parallel communication for flexible integration.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Character Generation<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Built-in character generator ROM with a wide range of pre-defined characters.<\/li>\n\n\n\n<li>Custom characters can be created using the Character Generator RAM (CGRAM).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Power Requirements<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Operates at 5V, with a typical current consumption of 1-2 mA.<\/li>\n\n\n\n<li>Low-power option for battery-operated devices.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Backlight<\/strong>:\n<ul class=\"wp-block-list\">\n<li>LED backlighting for clear visibility in low-light conditions.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Adjustable Contrast<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Contrast can be tuned using an external potentiometer, enhancing user readability.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Temperature Range<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Operates reliably between -20\u00b0C to +70\u00b0C, suitable for diverse environments.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Compact Design<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Lightweight and easy to integrate into compact projects.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Wide Applicability<\/strong>:\n<ul class=\"wp-block-list\">\n<li>Perfect for displaying text in DIY electronics, robotics, automation systems, and IoT applications.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>This robust combination of features makes the Liquid Crystal 1602 a preferred choice for developers looking for a reliable and easy-to-use display module.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Connection:<\/h2>\n\n\n\n<p>The connection of the LCD to STM32F411RE Nucleo-64 is as following:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"894\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-1024x894.jpg\" alt=\"\" class=\"wp-image-3170\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-1024x894.jpg 1024w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-300x262.jpg 300w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-768x671.jpg 768w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-1536x1341.jpg 1536w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-1150x1004.jpg 1150w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-750x655.jpg 750w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-400x349.jpg 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05-250x218.jpg 250w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_16-33-05.jpg 1782w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>The pins of LCD1602 as following:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"308\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/16x2-LCD-Pinout.png\" alt=\"\" class=\"wp-image-3171\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/16x2-LCD-Pinout.png 500w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/16x2-LCD-Pinout-300x185.png 300w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/16x2-LCD-Pinout-400x246.png 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/16x2-LCD-Pinout-250x154.png 250w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>LCD1602 Display<\/td><td>STM32F411 Nucleo-64<\/td><\/tr><tr><td>Vss<\/td><td>GND<\/td><\/tr><tr><td>Vdd<\/td><td>5V<\/td><\/tr><tr><td>Ve<\/td><td>Middle of Potentiometer<\/td><\/tr><tr><td>Register Select<\/td><td>PA0 (A0 of Arduino Uno Pin)<\/td><\/tr><tr><td>Read\/Write<\/td><td>GND<\/td><\/tr><tr><td>Enable<\/td><td>PA1 (A1 of Arduino Uno Pin)<\/td><\/tr><tr><td>D0-D3<\/td><td>Not connected<\/td><\/tr><tr><td>D4<\/td><td>PA4 (A2 of Arduino Uno Pin)<\/td><\/tr><tr><td>D5<\/td><td>PB0 (A3 of Arduino Uno Pin)<\/td><\/tr><tr><td>D6<\/td><td>PC1 (A4 of Arduino Uno Pin)<\/td><\/tr><tr><td>D7<\/td><td>PC0 (A5 of Arduino Uno Pin)<\/td><\/tr><tr><td>LED+<\/td><td>5V<\/td><\/tr><tr><td>LED-<\/td><td>GND<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Connect the two pins of the potentiometer to 5V and GND respectively.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. STM32CubeMX Initialization:<\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>Open STM32CubeIDE after selecting the workspace and create new project as following:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"355\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-1024x355.jpg\" alt=\"\" class=\"wp-image-2940\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-1024x355.jpg 1024w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-300x104.jpg 300w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-768x266.jpg 768w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-1536x532.jpg 1536w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-2048x709.jpg 2048w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-1150x398.jpg 1150w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-750x260.jpg 750w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-400x139.jpg 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-26-00-250x87.jpg 250w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Select the MCU:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"832\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-1024x832.jpg\" alt=\"\" class=\"wp-image-2941\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-1024x832.jpg 1024w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-300x244.jpg 300w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-768x624.jpg 768w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-1536x1248.jpg 1536w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-2048x1664.jpg 2048w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-1150x934.jpg 1150w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-750x609.jpg 750w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-400x325.jpg 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-27-14-250x203.jpg 250w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Give the project a name:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"813\" height=\"1024\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29-813x1024.jpg\" alt=\"\" class=\"wp-image-3173\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29-813x1024.jpg 813w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29-238x300.jpg 238w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29-768x968.jpg 768w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29-750x945.jpg 750w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29-400x504.jpg 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29-250x315.jpg 250w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-03-29.jpg 984w\" sizes=\"(max-width: 813px) 100vw, 813px\" \/><\/figure>\n\n\n\n<p>In the CubeMX window, enable the following GPIOs as output:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-1024x1024.jpg\" alt=\"\" class=\"wp-image-3174\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-1024x1024.jpg 1024w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-300x300.jpg 300w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-150x150.jpg 150w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-768x767.jpg 768w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-1536x1534.jpg 1536w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-1150x1149.jpg 1150w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-750x750.jpg 750w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-400x400.jpg 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48-250x250.jpg 250w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2025\/01\/2025-01-18_17-06-48.jpg 1552w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Give each GPIO a name as shown in the figure above.<\/p>\n\n\n\n<p>From Project Manager tab, select Code Generation and enable Generate peripheral initialization as pair of .c\/.h files per peripheral as following:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"363\" src=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-1024x363.jpg\" alt=\"\" class=\"wp-image-2949\" srcset=\"https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-1024x363.jpg 1024w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-300x106.jpg 300w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-768x273.jpg 768w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-1536x545.jpg 1536w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-2048x727.jpg 2048w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-1150x408.jpg 1150w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-750x266.jpg 750w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-400x142.jpg 400w, https:\/\/blog.embeddedexpert.io\/wp-content\/uploads\/2024\/10\/2024-10-26_16-45-24-250x89.jpg 250w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Save the project this will generate the project.<\/p>\n\n\n\n<p>Stay tuned for part 2.<\/p>\n\n\n\n<p>Happy coding \ud83d\ude09<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This guide is part one of a two-part series that explains how to interface a 1602 Liquid Crystal Display (LCD) module with the HD44780 driver to an STM32F4 microcontroller. In this part, we focus on the LCD features, hardware connections, and STM32CubeMX initialization. In this guide, we shall cover the following: 1. Feature of 1602 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,19,11,12],"tags":[],"class_list":["post-3168","post","type-post","status-publish","format-standard","hentry","category-embedded-systems","category-lcd","category-peripheral-drivers","category-stm32"],"_links":{"self":[{"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=\/wp\/v2\/posts\/3168"}],"collection":[{"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3168"}],"version-history":[{"count":3,"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=\/wp\/v2\/posts\/3168\/revisions"}],"predecessor-version":[{"id":3176,"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=\/wp\/v2\/posts\/3168\/revisions\/3176"}],"wp:attachment":[{"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3168"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3168"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.embeddedexpert.io\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}