Add Zephyr support for Renesas EK-RZ/A3M board

- Add RZ/A3M board configuration in CMakeLists.txt for both demos
- Add software rotation support for portrait displays (720x1280)
- Add touch input support with GT911 controller
- Update west.yaml to use Renesas Zephyr fork (wip_rz branch)
- Add board-specific config and overlay files

Author: task-jp

demos/home-automation/zephyr/CMakeLists.txt

@@ -14,6 +14,10 @@ if(BOARD STREQUAL "native_sim/native/64")
 elseif(BOARD STREQUAL "mimxrt1170_evk@B/mimxrt1176/cm7")
     set(Rust_CARGO_TARGET "thumbv7em-none-eabihf")
     set(BOARD_CONF_NAME "mimxrt1170_evk_mimxrt1176_cm7")
+elseif(BOARD STREQUAL "rza3m_ek")
+    set(Rust_CARGO_TARGET "aarch64-unknown-none")
+    set(SLINT_LIBRARY_CARGO_FLAGS "-Zbuild-std=core,alloc")
+    set(BOARD_CONF_NAME "rza3m_ek")
 else()
     # See rustc --print target-list for available targets. Match that up with you supported board
     # https://docs.zephyrproject.org/latest/boards

demos/home-automation/zephyr/README.md

@@ -83,6 +83,8 @@ The `-p always` option of the build command forces a pristine build. The Zephyr
 
 ## Build and Run the Example on a Device
 
+### NXP MIMXRT1170-EVKB
+
 This sample has been tested on the [NXP MIMXRT1170-EVKB](https://docs.zephyrproject.org/latest/boards/nxp/mimxrt1170_evk/doc/index.html) with a [RK055HDMIPI4MA0 MIPI display](https://docs.zephyrproject.org/latest/boards/shields/rk055hdmipi4ma0/doc/index.html). The board/debug probe may require configuring as described [here](https://docs.zephyrproject.org/latest/boards/nxp/mimxrt1170_evk/doc/index.html#configuring-a-debug-probe).
 
 ```bash
@@ -92,3 +94,30 @@ west build -b mimxrt1170_evk@B/mimxrt1176/cm7 -p always slint/demos/home-automat
 # Flash
 west flash
 ```
+
+### Renesas EK-RZ/A3M
+
+This sample can run on the [Renesas EK-RZ/A3M](https://www.renesas.com/en/products/microcontrollers-microprocessors/rz-mpus/ek-rza3m-evaluation-kit-rza3m-mpu) evaluation kit with its 5-inch 720x1280 MIPI display.
+
+**Note:** The EK-RZ/A3M requires using Renesas's Zephyr fork. Replace step 4 of the prerequisites with:
+
+```bash
+# If Slint source is already checked out (use west-rza3m.yaml instead of west.yaml):
+cd ..
+west init -l --mf demos/zephyr-common/west-rza3m.yaml ./slint
+
+# If you do not have Slint source yet:
+west init -m https://github.com/slint-ui/slint --mr zephyr --mf demos/zephyr-common/west-rza3m.yaml slint-zephyr
+cd slint-zephyr
+
+# Checkout the repositories:
+west update
+```
+
+```bash
+# Build
+west build -b rza3m_ek -p always slint/demos/home-automation/zephyr -- -DSHIELD=rtkapplcdms02001be -DCMAKE_BUILD_TYPE=Release
+
+# Flash (using J-Link)
+west flash
+```

demos/printerdemo/zephyr/CMakeLists.txt

@@ -14,6 +14,10 @@ if(BOARD STREQUAL "native_sim/native/64")
 elseif(BOARD STREQUAL "mimxrt1170_evk@B/mimxrt1176/cm7")
     set(Rust_CARGO_TARGET "thumbv7em-none-eabi")
     set(BOARD_CONF_NAME "mimxrt1170_evk_mimxrt1176_cm7")
+elseif(BOARD STREQUAL "rza3m_ek")
+    set(Rust_CARGO_TARGET "aarch64-unknown-none")
+    set(SLINT_LIBRARY_CARGO_FLAGS "-Zbuild-std=core,alloc")
+    set(BOARD_CONF_NAME "rza3m_ek")
 else()
     # See rustc --print target-list for available targets. Match that up with you supported board
     # https://docs.zephyrproject.org/latest/boards
@@ -33,10 +37,10 @@ endif()
 find_package(Zephyr)
 project(slint_zephyr_printer_demo_mcu LANGUAGES CXX)
 
-set(SLINT_FEATURE_FREESTANDING ON)
-set(SLINT_FEATURE_RENDERER_SOFTWARE ON)
-set(DEFAULT_SLINT_EMBED_RESOURCES "embed-for-software-renderer" CACHE STRING "")
-# set(CMAKE_BUILD_TYPE Release)
+set(SLINT_FEATURE_FREESTANDING ON CACHE BOOL "" FORCE)
+set(SLINT_FEATURE_RENDERER_SOFTWARE ON CACHE BOOL "" FORCE)
+set(SLINT_FEATURE_SDF_FONTS ON CACHE BOOL "" FORCE)
+set(DEFAULT_SLINT_EMBED_RESOURCES "embed-for-software-renderer-with-sdf" CACHE STRING "")
 set(BUILD_SHARED_LIBS OFF)
 
 # Work around gcc_s linker issue?

demos/printerdemo/zephyr/README.md

@@ -83,6 +83,8 @@ The `-p always` option of the build command forces a pristine build. The Zephyr
 
 ## Build and Run the Example on a Device
 
+### NXP MIMXRT1170-EVKB
+
 This sample has been tested on the [NXP MIMXRT1170-EVKB](https://docs.zephyrproject.org/latest/boards/nxp/mimxrt1170_evk/doc/index.html) with a [RK055HDMIPI4MA0 MIPI display](https://docs.zephyrproject.org/latest/boards/shields/rk055hdmipi4ma0/doc/index.html). The board/debug probe may require configuring as described [here](https://docs.zephyrproject.org/latest/boards/nxp/mimxrt1170_evk/doc/index.html#configuring-a-debug-probe).
 
 ```bash
@@ -92,3 +94,30 @@ west build -b mimxrt1170_evk@B/mimxrt1176/cm7 -p always slint/demos/printerdemo/
 # Flash
 west flash
 ```
+
+### Renesas EK-RZ/A3M
+
+This sample can run on the [Renesas EK-RZ/A3M](https://www.renesas.com/en/products/microcontrollers-microprocessors/rz-mpus/ek-rza3m-evaluation-kit-rza3m-mpu) evaluation kit with its 5-inch 720x1280 MIPI display.
+
+**Note:** The EK-RZ/A3M requires using Renesas's Zephyr fork. Replace step 4 of the prerequisites with:
+
+```bash
+# If Slint source is already checked out (use west-rza3m.yaml instead of west.yaml):
+cd ..
+west init -l --mf demos/zephyr-common/west-rza3m.yaml ./slint
+
+# If you do not have Slint source yet:
+west init -m https://github.com/slint-ui/slint --mr zephyr --mf demos/zephyr-common/west-rza3m.yaml slint-zephyr
+cd slint-zephyr
+
+# Checkout the repositories:
+west update
+```
+
+```bash
+# Build
+west build -b rza3m_ek -p always slint/demos/printerdemo/zephyr -- -DSHIELD=rtkapplcdms02001be -DCMAKE_BUILD_TYPE=Release
+
+# Flash (using J-Link)
+west flash
+```

demos/zephyr-common/boards/rza3m_ek.conf

@@ -0,0 +1,14 @@
+# Copyright © SixtyFPS GmbH <info@slint.dev>
+# SPDX-License-Identifier: MIT
+
+CONFIG_MAIN_STACK_SIZE=65536
+CONFIG_HEAP_MEM_POOL_SIZE=16777216
+CONFIG_COMMON_LIBC_MALLOC_ARENA_SIZE=8388608
+
+CONFIG_DISPLAY=y
+CONFIG_MIPI_DSI=y
+CONFIG_GPIO=y
+
+CONFIG_INPUT=y
+CONFIG_INPUT_GT911=y
+CONFIG_INPUT_QUEUE_MAX_MSGS=64

demos/zephyr-common/boards/rza3m_ek.overlay

@@ -0,0 +1,8 @@
+// Copyright © SixtyFPS GmbH <info@slint.dev>
+// SPDX-License-Identifier: MIT
+
+/ {
+	chosen {
+		zephyr,touch = &gt911_rtkapplcdms02001be;
+	};
+};

demos/zephyr-common/slint-zephyr.cpp

@@ -67,6 +67,7 @@ struct RotationInfo
     using RenderingRotation = slint::platform::SoftwareRenderer::RenderingRotation;
     RenderingRotation rotation = RenderingRotation::NoRotation;
     slint::PhysicalSize size;
+    bool software_rotation = false;
 
     bool is_transpose() const
     {
@@ -75,12 +76,22 @@ struct RotationInfo
 
     bool mirror_width() const
     {
-        return rotation == RenderingRotation::Rotate180 || rotation == RenderingRotation::Rotate270;
+        if (software_rotation) {
+            return rotation == RenderingRotation::Rotate180
+                    || rotation == RenderingRotation::Rotate90;
+        }
+        return rotation == RenderingRotation::Rotate180
+                || rotation == RenderingRotation::Rotate270;
     }
 
     bool mirror_height() const
     {
-        return rotation == RenderingRotation::Rotate90 || rotation == RenderingRotation::Rotate180;
+        if (software_rotation) {
+            return rotation == RenderingRotation::Rotate270
+                    || rotation == RenderingRotation::Rotate180;
+        }
+        return rotation == RenderingRotation::Rotate90
+                || rotation == RenderingRotation::Rotate180;
     }
 };
 
@@ -150,7 +161,8 @@ class ZephyrWindowAdapter : public slint::platform::WindowAdapter
 
     const struct device *m_display;
     const RotationInfo m_rotationInfo;
-    const slint::PhysicalSize m_size;
+    const slint::PhysicalSize m_physicalSize;
+    const slint::PhysicalSize m_logicalSize;
 
     bool m_needs_redraw = true;
     std::vector<slint::platform::Rgb565Pixel> m_buffer;
@@ -228,6 +240,10 @@ std::unique_ptr<ZephyrWindowAdapter> ZephyrWindowAdapter::init_from(const device
         info.rotation = slint::platform::SoftwareRenderer::RenderingRotation::Rotate180;
     else if (IS_ENABLED(CONFIG_MCUX_ELCDIF_PXP_ROTATE_270))
         info.rotation = slint::platform::SoftwareRenderer::RenderingRotation::Rotate90;
+#ifdef CONFIG_BOARD_RZA3M_EK
+    info.rotation = slint::platform::SoftwareRenderer::RenderingRotation::Rotate90;
+    info.software_rotation = true;
+#endif
 
     const auto rotatedSize = transformed(info.size, info);
     LOG_INF("Rotated screen size: %u x %u", rotatedSize.width, rotatedSize.height);
@@ -239,14 +255,19 @@ ZephyrWindowAdapter::ZephyrWindowAdapter(const device *display, RepaintBufferTyp
     : m_renderer(buffer_type),
       m_display(display),
       m_rotationInfo(info),
-      m_size(transformed(m_rotationInfo.size, m_rotationInfo))
+      m_physicalSize(info.size),
+      m_logicalSize(transformed(info.size, info))
 {
-    m_buffer.resize(m_size.width * m_size.height);
+    m_buffer.resize(m_physicalSize.width * m_physicalSize.height);
 
     m_buffer_descriptor.buf_size = sizeof(m_buffer[0]) * m_buffer.size();
-    m_buffer_descriptor.width = m_size.width;
-    m_buffer_descriptor.height = m_size.height;
-    m_buffer_descriptor.pitch = m_size.width;
+    m_buffer_descriptor.width = m_physicalSize.width;
+    m_buffer_descriptor.height = m_physicalSize.height;
+    m_buffer_descriptor.pitch = m_physicalSize.width;
+
+    if (m_rotationInfo.software_rotation) {
+        m_renderer.set_rendering_rotation(m_rotationInfo.rotation);
+    }
 }
 
 void ZephyrWindowAdapter::request_redraw()
@@ -256,7 +277,7 @@ void ZephyrWindowAdapter::request_redraw()
 
 slint::PhysicalSize ZephyrWindowAdapter::size()
 {
-    return m_size;
+    return m_logicalSize;
 }
 
 slint::platform::AbstractRenderer &ZephyrWindowAdapter::renderer()
@@ -270,16 +291,16 @@ void ZephyrWindowAdapter::maybe_redraw()
         return;
 
     auto start = k_uptime_get();
-    auto region = m_renderer.render(m_buffer, m_size.width);
+    auto region = m_renderer.render(m_buffer, m_physicalSize.width);
     const auto slintRenderDelta = k_uptime_delta(&start);
     LOG_DBG("Rendering %d dirty regions:", std::ranges::size(region.rectangles()));
     for (auto [o, s] : region.rectangles()) {
-#ifndef CONFIG_SHIELD_RK055HDMIPI4MA0
+#if !defined(CONFIG_SHIELD_RK055HDMIPI4MA0) && !defined(CONFIG_BOARD_RZA3M_EK)
         // Convert to big endian pixel data for Zephyr, unless we are using the RK055HDMIPI4MA0
-        // shield. See is_supported_pixel_format above.
+        // shield or rza3m_ek board. See is_supported_pixel_format above.
         for (int y = o.y; y < o.y + s.height; y++) {
             for (int x = o.x; x < o.x + s.width; x++) {
-                auto px = reinterpret_cast<uint16_t *>(&m_buffer[y * m_size.width + x]);
+                auto px = reinterpret_cast<uint16_t *>(&m_buffer[y * m_physicalSize.width + x]);
                 *px = (*px << 8) | (*px >> 8);
             }
         }
@@ -292,7 +313,7 @@ void ZephyrWindowAdapter::maybe_redraw()
         m_buffer_descriptor.height = s.height;
 
         if (const auto ret = display_write(m_display, o.x, o.y, &m_buffer_descriptor,
-                                           m_buffer.data() + ((o.y * m_size.width) + o.x))
+                                           m_buffer.data() + ((o.y * m_physicalSize.width) + o.x))
                     != 0) {
             LOG_WRN("display_write returned non-zero: %d", ret);
         }
@@ -391,7 +412,10 @@ void ZephyrPlatform::run_event_loop()
         }
 
         if (auto next_timer_update = slint::platform::duration_until_next_timer_update()) {
-            const auto wait_time_ms = next_timer_update.value().count();
+            auto wait_time_ms = next_timer_update.value().count();
+#ifdef CONFIG_BOARD_RZA3M_EK
+            wait_time_ms = std::min(wait_time_ms, static_cast<decltype(wait_time_ms)>(10000));
+#endif
             LOG_DBG("Sleeping for %llims", wait_time_ms);
             k_sem_take(&SLINT_SEM, K_MSEC(wait_time_ms));
         } else {
@@ -483,7 +507,9 @@ void zephyr_process_input_event(struct input_event *event, void *user_data)
     }
 }
 
+#if DT_HAS_CHOSEN(zephyr_touch)
 INPUT_CALLBACK_DEFINE(DEVICE_DT_GET(DT_CHOSEN(zephyr_touch)), zephyr_process_input_event, NULL);
+#endif
 
 void slint_zephyr_init(const struct device *display)
 {

demos/zephyr-common/west-rza3m.yaml

@@ -0,0 +1,17 @@
+# Copyright © SixtyFPS GmbH <info@slint.dev>
+# SPDX-License-Identifier: MIT
+
+# West manifest for Renesas EK-RZ/A3M board.
+# The RZ/A3M requires Renesas's Zephyr fork (wip_rz branch) for board and display support.
+# Use this manifest instead of west.yaml when building for rza3m_ek.
+
+---
+manifest:
+  remotes:
+    - name: renesas
+      url-base: https://github.com/renesas
+  projects:
+    - name: zephyr
+      remote: renesas
+      revision: wip_rz
+      import: true