{"id":129654,"date":"2026-03-10T09:52:08","date_gmt":"2026-03-10T08:52:08","guid":{"rendered":"https:\/\/riverdi.com\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4"},"modified":"2026-05-11T15:23:57","modified_gmt":"2026-05-11T13:23:57","slug":"getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4","status":"publish","type":"post","link":"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4","title":{"rendered":"Primeros pasos con STM32H7 controlando dos pantallas: TouchGFX + EVE4"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabla de contenidos\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #002175;color:#002175\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #002175;color:#002175\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Vision_general_del_hardware\" >Visi\u00f3n general del hardware<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Programacion_y_depuracion\" >Programaci\u00f3n y depuraci\u00f3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Muestra\" >Muestra<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Interfaces\" >Interfaces<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Pila_de_software\" >Pila de software<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Desarrollo\" >Desarrollo<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Graficos_e_IU\" >Gr\u00e1ficos e IU<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Capa_de_aplicacion\" >Capa de aplicaci\u00f3n<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Concepto_de_arquitectura_una_logica_dos_renderizadores\" >Concepto de arquitectura: una l\u00f3gica, dos renderizadores<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Modelos_de_renderizado\" >Modelos de renderizado<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Escenario_de_demostracion_estado_compartido_e_interaccion_bidireccional\" >Escenario de demostraci\u00f3n: estado compartido e interacci\u00f3n bidireccional<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Orden_de_inicializacion\" >Orden de inicializaci\u00f3n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Estructura_del_proyecto\" >Estructura del proyecto<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Modelo_de_tiempo_de_ejecucion_TouchGFX_tarea_EVE\" >Modelo de tiempo de ejecuci\u00f3n (TouchGFX + tarea EVE)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Resumen_de_la_renderizacion_de_EVE\" >Resumen de la renderizaci\u00f3n de EVE<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Resultado\" >Resultado<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\/#Resumen_y_proximos_pasos\" >Resumen y pr\u00f3ximos pasos<\/a><\/li><\/ul><\/nav><\/div>\n<p>\u00bfPuede una pantalla integrada manejar otra al mismo tiempo?<br \/>\nEn esta gu\u00eda, mostramos c\u00f3mo un \u00fanico STM32H7 integrado en una pantalla Riverdi puede, simult\u00e1neamente:<\/p>\n<ul>\n<li>renderizar su propia GUI utilizando TouchGFX, y<\/li>\n<li>controlar una segunda pantalla basada en EVE4 a trav\u00e9s de RiBUS (SPI).<\/li>\n<\/ul>\n<p>El resultado es una plantilla limpia y repetible para sistemas de doble pantalla, como terminales de punto de venta, quioscos y paneles HMI industriales.<br \/>\nEl ejemplo es intencionadamente m\u00ednimo. Se centra en: <\/p>\n<ul>\n<li>orden correcto de inicializaci\u00f3n,<\/li>\n<li>una clara separaci\u00f3n de responsabilidades,<\/li>\n<li>un estado de aplicaci\u00f3n compartido utilizado por dos rutas de renderizado independientes.<\/li>\n<\/ul>\n<p>La estructura est\u00e1 dise\u00f1ada como una base pr\u00e1ctica que puede ampliarse paso a paso en proyectos reales.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Vision_general_del_hardware\"><\/span>Visi\u00f3n general del hardware<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Programacion_y_depuracion\"><\/span>Programaci\u00f3n y depuraci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>ST-LINK\/V3 conectado mediante SWD al STM32H7 integrado en la pantalla Riverdi<\/li>\n<li>S\u00f3lo se programa el STM32H7<\/li>\n<li>La pantalla del EVE4 nunca parpadea y se comunica exclusivamente a trav\u00e9s de SPI<br \/>\n(RiBUS)<br \/>\nSTM32 + EVE4 &#8211; Blog<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Muestra\"><\/span>Muestra<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/riverdi.com\/es\/product\/pantalla-lcd-de-7-pulgadas-con-panel-tactil-capacitivo-y-vinculacion-optica-uxtouch-stm32h7-rvt70hssnwc00-b\">Riverdi STM32 Embedded Display<\/a> (maestro)<br \/>\nPantalla de 7&#8243; con STM32H7 integrado, controlada por TouchGFX.<\/p>\n<p><a href=\"https:\/\/riverdi.com\/es\/product\/eve4-intelligent-display-rvt70hsbnwc00-b-pantalla-tactil-capacitiva-proyectada-de-7-pulgadas-con-vinculacion-optica-uxtouch\">Pantalla Riverdi EVE4<\/a> (esclava)<br \/>\nPantalla de 7&#8243; basada en EVE4, controlada por STM32H7 a trav\u00e9s de RiBUS.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Interfaces\"><\/span>Interfaces<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>SWD &#8211; programaci\u00f3n y depuraci\u00f3n<\/li>\n<li>SPI (RiBUS) &#8211; STM32H7 \u2192 Interfaz de comandos EVE4<\/li>\n<li>Interfaces t\u00e1ctiles en ambas pantallas<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"alignnone wp-image-128880 size-full\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4.jpg\" alt=\"\" width=\"1280\" height=\"600\" srcset=\"https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4.jpg 1280w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4-300x141.jpg 300w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4-1024x480.jpg 1024w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4-768x360.jpg 768w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4-600x281.jpg 600w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4-64x30.jpg 64w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Pila_de_software\"><\/span>Pila de software<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Desarrollo\"><\/span>Desarrollo<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>STM32CubeIDE<\/li>\n<li>STM32 HAL<\/li>\n<li>FreeRTOS<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Graficos_e_IU\"><\/span>Gr\u00e1ficos e IU<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>TouchGFX &#8211; GUI basada en framebuffer en la pantalla integrada del STM32H7<\/li>\n<li>EVE4 (BT81x) &#8211; renderizado basado en comandos mediante listas de visualizaci\u00f3n a trav\u00e9s de SPI<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Capa_de_aplicacion\"><\/span>Capa de aplicaci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>L\u00f3gica de aplicaci\u00f3n \u00fanica en STM32H7<\/li>\n<li>Contextos de ejecuci\u00f3n separados (tareas FreeRTOS)<\/li>\n<li>Estado de aplicaci\u00f3n compartido utilizado para sincronizar ambas pantallas<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Concepto_de_arquitectura_una_logica_dos_renderizadores\"><\/span>Concepto de arquitectura: una l\u00f3gica, dos renderizadores<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>El principio arquitect\u00f3nico clave es la separaci\u00f3n entre l\u00f3gica y representaci\u00f3n.<\/p>\n<ul>\n<li>STM32H7 posee el estado de la aplicaci\u00f3n<\/li>\n<li>TouchGFX y EVE4 son backends de renderizado independientes<\/li>\n<li>Ambas pantallas reaccionan al mismo estado compartido<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Modelos_de_renderizado\"><\/span>Modelos de renderizado<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong>TouchGFX<\/strong><\/p>\n<ul>\n<li>Renderizado basado en b\u00fafer de trama<\/li>\n<li>Totalmente gestionado por el STM32H7<\/li>\n<\/ul>\n<p><strong>EVE4<\/strong><\/p>\n<ul>\n<li>Renderizado basado en comandos mediante Listas de Visualizaci\u00f3n<\/li>\n<li>Renderizado ejecutado por la GPU de EVE<\/li>\n<\/ul>\n<p>El objetivo no es comparar estos enfoques, sino demostrar que ambos pueden coexistir limpiamente en un \u00fanico sistema controlado por un microcontrolador.<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-128888 size-full\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_2.png\" alt=\"\" width=\"826\" height=\"760\" srcset=\"https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_2.png 826w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_2-300x276.png 300w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_2-768x707.png 768w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_2-600x552.png 600w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_2-64x59.png 64w\" sizes=\"(max-width: 826px) 100vw, 826px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Escenario_de_demostracion_estado_compartido_e_interaccion_bidireccional\"><\/span>Escenario de demostraci\u00f3n: estado compartido e interacci\u00f3n bidireccional<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>El ejemplo muestra un peque\u00f1o estado compartido de la aplicaci\u00f3n intercambiado entre dos UI independientes.<\/p>\n<ul>\n<li>La <strong>pantalla TouchGFX (maestra)<\/strong> propone los cambios.<\/li>\n<li>La <strong>pantalla del EVE4 (esclavo<\/strong> ) las confirma o las rechaza.<\/li>\n<\/ul>\n<p>La interacci\u00f3n t\u00e1ctil en una pantalla afecta directamente al comportamiento de la otra.<\/p>\n<p><strong>Estado compartido de la aplicaci\u00f3n<\/strong><\/p>\n<pre style=\"white-space: break-spaces; padding: 15px; border: solid 1px; word-wrap: break-word; background-color: #f2f6ff;\">typedef struct {\n\nuint8_t color_propuesto_maestro;\nuint8_t solicitud_maestra_pendiente;\nuint8_t esclavo_color_actual;\nuint8_t esclavo_\u00faltimaRespuesta;\nuint8_t esclavo_respuestaSucio;\n\n} app_state_t;\n\nvolatile app_state_t gAppState = {\n\n.color_propuesto_maestro = COLOR_ROJO,\n.master_requestPending = 0,\n.slave_currentColor = COLOR_ROJO,\n.slave_lastResponse = SLAVE_IDLE,\n.esclavo_respuestaSucio = 0\n\n};\nEl estado se inicializa de forma determinista para que ambas pantallas comiencen sincronizadas.<\/pre>\n<p>A partir de ah\u00ed:<\/p>\n<ul>\n<li>TouchGFX actualiza <em>master_proposedColor<\/em> y establece <em>master_requestPending.<\/em><\/li>\n<li>EVE4 acepta o rechaza y actualiza <em>slave_currentColor<\/em> y <em>slave_lastResponse<\/em>.<\/li>\n<\/ul>\n<p>Ambas rutas de renderizado leen continuamente <em>gAppState<\/em> y actualizan su IU en consecuencia.<\/p>\n<p>Esto mantiene el flujo de interacci\u00f3n expl\u00edcito, f\u00e1cil de seguir y totalmente impulsado por la l\u00f3gica de aplicaci\u00f3n compartida de<br \/>\n, en lugar de por la comunicaci\u00f3n directa de pantalla a pantalla.<\/p>\n<p>Este modelo de interacci\u00f3n es intencionadamente sencillo y sirve de plantilla clara para proyectos reales de<br \/>\nen los que dos pantallas tienen que cooperar sin dejar de ser arquitect\u00f3nicamente independientes.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Orden_de_inicializacion\"><\/span>Orden de inicializaci\u00f3n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Aqu\u00ed s\u00f3lo se muestra la secuencia correcta.<\/p>\n<ol>\n<li><strong>Inicializaci\u00f3n de la MCU y relojes<\/strong><br \/>\n<em>HAL_Init() \u2192 SystemClock_Config() \u2192 PeriphCommonClock_Config()<\/em><\/li>\n<li><strong>Inicializaci\u00f3n de perif\u00e9ricos<\/strong><br \/>\n<em>GPIO, LTDC\/DSI, DMA2D\/MDMA, SPI, temporizadores, memoria externa (SDRAM\/QSPI)<\/em><\/li>\n<li><strong>Inicializaci\u00f3n de TouchGFX<\/strong><br \/>\n<em>MX_TouchGFX_Init() \u2192 MX_TouchGFX_PreOSInit()<\/em><\/li>\n<li><strong>Inicializaci\u00f3n SPI para RiBUS<\/strong><br \/>\n<em>MX_SPI1_Init() (o instancia seleccionada)<\/em><\/li>\n<li><strong>Inicializaci\u00f3n de EVE4<\/strong><br \/>\n<em>EVE4_RiBUS_Init(&amp;eve)<\/em><br \/>\n<em>EVE4_RiBUS_ConfigIPS70(&amp;eve)<\/em><\/li>\n<li><strong>Iniciar FreeRTOS<\/strong><br \/>\n<em>osKernelInitialize() \u2192 MX_FREERTOS_Init() \u2192 osKernelStart()<\/em><\/li>\n<\/ol>\n<p>Seguir esta secuencia evita sutiles problemas de arranque y garantiza que ambas rutas de renderizado se inicialicen limpiamente. TouchGFX se inicia con un canal de visualizaci\u00f3n totalmente configurado, y el EVE4 est\u00e1 listo para renderizar en cuanto su tarea FreeRTOS comienza a ejecutarse. <\/p>\n<h2><span class=\"ez-toc-section\" id=\"Estructura_del_proyecto\"><\/span>Estructura del proyecto<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Este proyecto mantiene la interfaz de usuario TouchGFX y la integraci\u00f3n con EVE4 claramente separadas.<\/p>\n<ul>\n<li><strong>CM7\/Core\/<\/strong><br \/>\nPuesta en marcha de la MCU e inicializaci\u00f3n de los perif\u00e9ricos (main.c, *_init.c)<br \/>\nconfiguraci\u00f3n del sistema y puesta en marcha de la placa<\/li>\n<li><strong>CM7\/TouchGFX\/<br \/>\n<\/strong>Aplicaci\u00f3n TouchGFX (pantallas, widgets, activos)<br \/>\nl\u00f3gica principal de IU (pantalla maestra)<strong><br \/>\n<\/strong><\/li>\n<li><strong>Application\/User\/Core\/<br \/>\napp_state.c \/ app_state.h<\/strong> &#8211; estado compartido de la aplicaci\u00f3n maestro\/esclavo (gAppState)<br \/>\n eve4_ribus<strong>.c \/ eve4_ribus.h<\/strong> &#8211; controlador EVE4 de bajo nivel (SPI + acceso a registros + ayudantes de la lista de pantallas)<br \/>\n eve_task<strong>.c<\/strong> &#8211; tarea EVE FreeRTOS (bucle de renderizado + manejo t\u00e1ctil de la pantalla esclava)<\/li>\n<li><strong>Aplicaci\u00f3n\/Usuario\/gui\/<\/strong> (capa de usuario de TouchGFX)<br \/>\npor ejemplo Screen1View.cpp\/.hpp &#8211; l\u00f3gica de IU maestra (proponer color, reflejar estado esclavo)<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Modelo_de_tiempo_de_ejecucion_TouchGFX_tarea_EVE\"><\/span>Modelo de tiempo de ejecuci\u00f3n (TouchGFX + tarea EVE)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La aplicaci\u00f3n se ejecuta en FreeRTOS y utiliza dos contextos de ejecuci\u00f3n independientes:<\/p>\n<p><strong>Tarea TouchGFX (pantalla maestra)<\/strong><\/p>\n<p>Gestiona la representaci\u00f3n de la interfaz de usuario principal y la interacci\u00f3n t\u00e1ctil en la pantalla controlada por STM32.<br \/>\nLas acciones del usuario actualizan el estado compartido (gAppState).<\/p>\n<p><strong>Tarea EVE (pantalla esclava)<\/strong><\/p>\n<p>Crea e intercambia listas de pantallas EVE y procesa la entrada t\u00e1ctil en la pantalla EVE4. Las decisiones (aceptar\/rechazar) actualizan gAppState y se reflejan en la interfaz de usuario maestra. Ambas rutas de renderizado reaccionan al mismo estado compartido de la aplicaci\u00f3n, manteniendo la arquitectura simple y las responsabilidades claramente separadas.  <\/p>\n<h2><span class=\"ez-toc-section\" id=\"Resumen_de_la_renderizacion_de_EVE\"><\/span>Resumen de la renderizaci\u00f3n de EVE<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La pantalla del EVE4 se actualiza mediante una secuencia de lista de visualizaci\u00f3n est\u00e1ndar ejecutada por<br \/>\nla GPU de EVE:<br \/>\nCLEAR_COLOR_RGB() &#8211; Fijar el color de fondo<br \/>\nCLEAR() &#8211; borra los buffers de dibujo<br \/>\ncomandos de dibujo<br \/>\nDISPLAY() &#8211; termina la lista de visualizaci\u00f3n<br \/>\nFlush_DL_Buffer() &#8211; copia los comandos a RAM_DL<br \/>\nDLSWAP_FRAME &#8211; hace visible el nuevo fotograma<br \/>\nEste flujo de renderizado de bajo nivel se mantiene intencionadamente simple y sin cambios, proporcionando a<br \/>\nun control total sobre c\u00f3mo y cu\u00e1ndo el EVE4 actualiza su pantalla.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Resultado\"><\/span>Resultado<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Con esta configuraci\u00f3n:<\/p>\n<ul>\n<li>ambas pantallas funcionan simult\u00e1neamente,<\/li>\n<li>ambas pantallas reaccionan a la entrada t\u00e1ctil,<\/li>\n<li>la interacci\u00f3n del usuario en una pantalla se refleja en la otra.<\/li>\n<\/ul>\n<p>El resultado es una arquitectura de doble pantalla limpia y escalable controlada por un \u00fanico STM32H7, en la que una aplicaci\u00f3n controla dos rutas de renderizado independientes con responsabilidades claramente separadas.<\/p>\n<p><img decoding=\"async\" class=\"alignnone wp-image-128895 size-full\" src=\"https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_3.png\" alt=\"\" width=\"826\" height=\"400\" srcset=\"https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_3.png 826w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_3-300x145.png 300w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_3-768x372.png 768w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_3-600x291.png 600w, https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_grafika_POMIEDZY-TEKSTY_3-64x31.png 64w\" sizes=\"(max-width: 826px) 100vw, 826px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Resumen_y_proximos_pasos\"><\/span>Resumen y pr\u00f3ximos pasos<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Esta plantilla proporciona un punto de partida para los sistemas que requieren dos pantallas controladas por un microcontrolador, utilizando modelos de representaci\u00f3n diferentes pero una l\u00f3gica de aplicaci\u00f3n compartida.<\/p>\n<p>Puede ampliarse de forma natural:<\/p>\n<ul>\n<li>ampliar el estado compartido,<\/li>\n<li>introducir funciones gr\u00e1ficas avanzadas de EVE,<\/li>\n<li>adaptar el modelo de interacci\u00f3n a flujos de trabajo m\u00e1s complejos,<\/li>\n<li>migrar a nuevas generaciones de EVE.<\/li>\n<\/ul>\n<p>El proyecto de referencia completo est\u00e1 disponible en GitHub:<br \/>\n<a href=\"https:\/\/github.com\/riverdi\/STM32H7-EVE4\" target=\"_blank\" rel=\"noopener\">https:\/\/github.com\/riverdi\/STM32H7-EVE4<\/a><\/p>\n<p>Este proyecto est\u00e1 dise\u00f1ado como base pr\u00e1ctica para sistemas escalables de doble pantalla basados en STM32 y EVE.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00bfPuede una pantalla integrada manejar otra al mismo tiempo? En esta gu\u00eda, mostramos c\u00f3mo un \u00fanico STM32H7 integrado en una pantalla Riverdi puede, simult\u00e1neamente: renderizar su propia GUI utilizando TouchGFX, y controlar una segunda pantalla basada en EVE4 a trav\u00e9s de RiBUS (SPI). El resultado es una plantilla limpia y repetible para sistemas de doble [&hellip;]<\/p>\n","protected":false},"author":3328,"featured_media":128884,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"categories":[787],"tags":[],"class_list":["post-129654","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pantalla-101"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Primeros pasos con STM32H7 controlando dos pantallas: TouchGFX + EVE4 - Riverdi<\/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:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Primeros pasos con STM32H7 controlando dos pantallas: TouchGFX + EVE4 - Riverdi\" \/>\n<meta property=\"og:description\" content=\"\u00bfPuede una pantalla integrada manejar otra al mismo tiempo? 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El resultado es una plantilla limpia y repetible para sistemas de doble [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/riverdi.com\/es\/blog\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\" \/>\n<meta property=\"og:site_name\" content=\"Riverdi\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/riverdi.displays\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-10T08:52:08+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-11T13:23:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/riverdi.com\/wp-content\/uploads\/2026\/03\/BLOG_COVER_GUIDE_STM32xEVE4.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1280\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Rafa\u0142 F\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@riverdidisplays\" \/>\n<meta name=\"twitter:site\" content=\"@riverdidisplays\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Rafa\u0142 F\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/riverdi.com\\\/es\\\/blog\\\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/riverdi.com\\\/es\\\/blog\\\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\"},\"author\":{\"name\":\"Rafa\u0142 F\",\"@id\":\"https:\\\/\\\/riverdi.com\\\/es#\\\/schema\\\/person\\\/dac328f88dda36bae87261c19a2e30ef\"},\"headline\":\"Primeros pasos con STM32H7 controlando dos pantallas: TouchGFX + EVE4\",\"datePublished\":\"2026-03-10T08:52:08+00:00\",\"dateModified\":\"2026-05-11T13:23:57+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/riverdi.com\\\/es\\\/blog\\\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\"},\"wordCount\":1256,\"image\":{\"@id\":\"https:\\\/\\\/riverdi.com\\\/es\\\/blog\\\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/riverdi.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/BLOG_COVER_GUIDE_STM32xEVE4.jpg\",\"articleSection\":[\"Pantalla 101\"],\"inLanguage\":\"es\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/riverdi.com\\\/es\\\/blog\\\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\",\"url\":\"https:\\\/\\\/riverdi.com\\\/es\\\/blog\\\/getting-started-with-stm32h7-controlling-two-displays-touchgfx-eve4\",\"name\":\"Primeros pasos con STM32H7 controlando dos pantallas: TouchGFX + EVE4 - 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