{"id":1370,"date":"2025-07-30T13:56:40","date_gmt":"2025-07-30T13:56:40","guid":{"rendered":"https:\/\/www.bleuio.com\/blog\/?p=1370"},"modified":"2025-07-30T16:58:52","modified_gmt":"2025-07-30T16:58:52","slug":"using-bleuio-with-waveshare-rp2350a-usb-mini-based-on-raspberry-pi-rp2350a","status":"publish","type":"post","link":"https:\/\/www.bleuio.com\/blog\/using-bleuio-with-waveshare-rp2350a-usb-mini-based-on-raspberry-pi-rp2350a\/","title":{"rendered":"Using BleuIO with Waveshare RP2350A USB Mini Based On Raspberry Pi RP2350A\u00a0"},"content":{"rendered":"\n<p>In this tutorial, we demonstrate how to connect the BleuIO Bluetooth Low Energy dongle to the <strong>Waveshare RP2350A USB Mini<\/strong> development board to create a dual-mode USB serial bridge. This example highlights the process of communicating with BleuIO using AT commands via USB host mode. It serves as a great starting point for anyone looking to build their own BLE application using this compact and powerful board.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">About the Waveshare RP2350A USB Mini<\/h2>\n\n\n\n<p>The <strong>Waveshare RP2350A USB Mini<\/strong> is a development board built around the <strong>Raspberry Pi RP2350<\/strong> microcontroller. It features a <strong>dual-core architecture<\/strong>, combining <strong>ARM Cortex-M33<\/strong> and <strong>RISC-V Hazard3<\/strong> cores, running at up to <strong>150 MHz<\/strong>. The chip includes <strong>520KB of SRAM<\/strong> and <strong>2MB of onboard flash<\/strong>, making it suitable for advanced embedded applications.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"808\" height=\"498\" src=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/07\/image-5.png\" alt=\"\" class=\"wp-image-1373\" style=\"width:419px;height:auto\" srcset=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/07\/image-5.png 808w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/07\/image-5-300x185.png 300w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/07\/image-5-768x473.png 768w\" sizes=\"auto, (max-width: 808px) 100vw, 808px\" \/><\/figure>\n\n\n\n<p>What sets this board apart is its <strong>USB-A connector<\/strong> with support for <strong>USB host mode<\/strong>, allowing it to communicate directly with USB peripherals like the BleuIO dongle. This makes it an ideal host controller for Bluetooth Low Energy (BLE) applications.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Project Overview<\/h2>\n\n\n\n<p>This project demonstrates a <strong>dual-mode USB serial bridge<\/strong> implemented on the RP2350A board. The bridge allows the board to simultaneously function as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>USB host<\/strong> using PIO-USB on GPIO 12\/13, connected to a device like BleuIO.<\/li>\n\n\n\n<li>A <strong>USB device<\/strong>, appearing as a virtual COM port when connected to a PC.<\/li>\n<\/ul>\n\n\n\n<p>Data is transparently forwarded between the host and device interfaces, allowing you to communicate with BleuIO from a terminal on your PC.<\/p>\n\n\n\n<p>This example project is useful for anyone looking to build a standalone USB host application using BleuIO. You can use the source code as a base and expand it into a more complex BLE project by sending and receiving AT commands directly from the RP2350A board.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Use Case<\/h2>\n\n\n\n<p>Imagine a scenario where you want to build a small, embedded BLE sensor gateway. Using the RP2350A as a USB host and BleuIO as the BLE interface, you can develop a powerful BLE solution without needing a full-sized computer. This approach is ideal for prototyping custom BLE applications, sensor data acquisition, or even building a mini BLE scanner.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hardware Requirements<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a class=\"\" href=\"https:\/\/www.waveshare.com\/wiki\/RP2350-USB-A\">Waveshare RP2350A USB Mini<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.bleuio.com\/bluetooth-low-energy-usb-ssd025.php\" target=\"_blank\" rel=\"noreferrer noopener\">BleuIO \u2013 Bluetooth Low Energy USB dongle<\/a><\/li>\n\n\n\n<li>UART adapter for debugging (connected to GP0 and GP1)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Software Requirements<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a class=\"\" href=\"https:\/\/github.com\/raspberrypi\/pico-sdk\">Pico SDK<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/developer.arm.com\/downloads\/-\/gnu-rm\" target=\"_blank\" rel=\"noreferrer noopener\">ARM GNU toolchain (<code>arm-none-eabi-gcc<\/code>)<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/cmake.org\/download\/\" target=\"_blank\" rel=\"noreferrer noopener\">CMake 3.13 or newer<\/a><\/li>\n\n\n\n<li>VS Code with Pico support (recommended)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Host Mode (PIO-USB on GPIO 12\/13)<\/h2>\n\n\n\n<p>In host mode, the RP2350 board uses PIO-USB to emulate USB host functionality on GPIO pins 12 (D+) and 13 (D-). You can connect any CDC-compatible device, such as a USB-to-serial adapter or the BleuIO dongle, to these pins.<\/p>\n\n\n\n<p>Once connected, the application automatically detects and configures the device. All incoming and outgoing serial data is forwarded and can be monitored through the debug UART interface.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Device Mode (Native USB Port)<\/h2>\n\n\n\n<p>When the RP2350A\u2019s native USB port is connected to your PC, it appears as a virtual serial port. This allows you to communicate with the BLE dongle (connected via host mode) using a terminal application like PuTTY or Tera Term.<\/p>\n\n\n\n<p>This enables full-duplex communication, letting you send AT commands to BleuIO and receive responses directly from your PC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Debug Output (UART on GP0\/GP1)<\/h2>\n\n\n\n<p>To observe internal debug messages, connect a UART adapter to GPIO 0 (TX) and GPIO 1 (RX) with a baud rate of <strong>115200<\/strong>. This output includes information such as device enumeration, data flow, and potential errors\u2014essential for troubleshooting and development.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Building the Project<\/h2>\n\n\n\n<p>To build the firmware, you can either use the provided build script or follow a manual setup.<\/p>\n\n\n\n<p>You can find the complete source code for this project on GitHub:<\/p>\n\n\n\n<p><strong>GitHub Repository<\/strong>: <a href=\"https:\/\/github.com\/smart-sensor-devices-ab\/bleuio-rp2350\" target=\"_blank\" rel=\"noreferrer noopener\">bleuio-rp2350<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Method 1: Using the build script<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>cd rp2350_serial_bridge<br>.\/build.sh<br><\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Method 2: Manual build with CMake<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>mkdir build &amp;&amp; cd build<br>cmake .. -DCMAKE_BUILD_TYPE=Release<br>make -j4<br><\/code><\/pre>\n\n\n\n<p>After building, a <code>rp2350_serial_bridge.uf2<\/code> file will be generated.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Flashing the Firmware<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Hold the <strong>BOOTSEL<\/strong> button on the RP2350 board and connect it to your PC via USB.<\/li>\n\n\n\n<li>The board will mount as a USB mass storage device.<\/li>\n\n\n\n<li>Copy the generated <code>rp2350_serial_bridge.uf2<\/code> file to this drive.<\/li>\n\n\n\n<li>The board will reboot and start running the dual-mode USB bridge application.<\/li>\n<\/ol>\n\n\n\n<p>You can now insert the BleuIO dongle into the USB-A port of the RP2350A board and begin communication from your PC.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Code Structure<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>main.c<\/code> \u2013 Main entry point of the application.<\/li>\n\n\n\n<li><code>serial_host_bridge.c\/h<\/code> \u2013 Handles the USB CDC host implementation.<\/li>\n\n\n\n<li><code>tusb_config.h<\/code> \u2013 TinyUSB configuration file.<\/li>\n\n\n\n<li><code>CMakeLists.txt<\/code> \u2013 Build configuration for CMake.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Getting Started with Your Own BLE App<\/h2>\n\n\n\n<p>This project is just a starting point. It demonstrates how to set up USB host\/device mode and communicate with a CDC-based USB dongle like BleuIO. From here, you can extend the code to parse responses, interact with BLE devices, or trigger actions based on received data.<\/p>\n\n\n\n<p>By combining the flexible RP2350A platform with BleuIO, developers can create their own powerful standalone BLE applications for IoT, sensors, or industrial control\u2014without relying on a full computer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Source Code<\/h2>\n\n\n\n<p>You can find the complete source code for this project on GitHub:<\/p>\n\n\n\n<p><strong>GitHub Repository<\/strong>: <a href=\"https:\/\/github.com\/smart-sensor-devices-ab\/bleuio-rp2350\" target=\"_blank\" rel=\"noreferrer noopener\">bleuio-rp2350<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this tutorial, we demonstrate how to connect the BleuIO Bluetooth Low Energy dongle to the Waveshare RP2350A USB Mini development board to create a dual-mode USB serial bridge. This example highlights the process of communicating with BleuIO using AT commands via USB host mode. It serves as a great starting point for anyone looking [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1371,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2],"tags":[],"class_list":["post-1370","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bleuio","category-bleuio-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Using BleuIO with Waveshare RP2350A USB Mini Based On Raspberry Pi RP2350A\u00a0 - BleuIO - Create Bluetooth Low Energy application<\/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.bleuio.com\/blog\/using-bleuio-with-waveshare-rp2350a-usb-mini-based-on-raspberry-pi-rp2350a\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using BleuIO with Waveshare RP2350A USB Mini Based On Raspberry Pi RP2350A\u00a0 - BleuIO - Create Bluetooth Low Energy application\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, we demonstrate how to connect the BleuIO Bluetooth Low Energy dongle to the Waveshare RP2350A USB Mini development board to create a dual-mode USB serial bridge. 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