diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/CMakeLists.txt b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/CMakeLists.txt
new file mode 100644
index 00000000..e1c3597d
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/CMakeLists.txt
@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.13)
+include(pico-sdk/pico_sdk_init.cmake)
+
+project(firmware)
+pico_sdk_init()
+
+add_executable(firmware
+	main.c
+	mongoose.c
+)
+
+target_include_directories(firmware PUBLIC
+	.
+)
+
+target_link_libraries(firmware hardware_pio pico_stdlib pico_rand)
+pico_add_extra_outputs(firmware)     # create map/bin/hex file etc.
+
+pico_enable_stdio_usb(firmware 1)    # Route stdio
+pico_enable_stdio_uart(firmware 0)   # to USB
+
+# Mongoose build flags in mongoose_config.h
+
+# Example build options
diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/Makefile b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/Makefile
new file mode 100644
index 00000000..ac6991c0
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/Makefile
@@ -0,0 +1,23 @@
+RM = rm -rf
+MKBUILD = test -d build || mkdir build
+ifeq ($(OS),Windows_NT)
+  RM = cmd /C del /Q /F /S
+  MKBUILD = if not exist build mkdir build
+endif
+
+all example:
+	true
+
+build build/firmware.uf2: pico-sdk main.c
+	$(MKBUILD)
+	cd build && cmake -G "Unix Makefiles" .. && make
+
+pico-sdk:
+	git clone --depth 1 -b 2.1.0 https://github.com/raspberrypi/pico-sdk $@
+	cd $@ && git submodule update --init
+
+clean:
+	$(RM) pico-sdk build
+
+.PHONY: build
+
diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/hal.h b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/hal.h
new file mode 100644
index 00000000..b7aae9cb
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/hal.h
@@ -0,0 +1,118 @@
+// Copyright (c) 2026 Cesanta Software Limited
+// All rights reserved
+
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+
+extern void mg_delayms(unsigned int ms);
+
+#define SPIPIO pio0
+#define SPISM 0
+#define MOSIPIN 23
+#define MISOPIN 22
+#define CLKPIN 21
+#define CSPIN 20
+#define RSTPIN 25
+
+// Try it on a bare Pico !
+// #define MOSIPIN 3
+// #define MISOPIN 4
+// #define CLKPIN 2
+// #define CSPIN 5
+
+#define piospi_wrap_target 0
+#define piospi_wrap 3
+#define piospi_pio_version 0
+
+static const uint16_t piospi_program_instructions[] = {
+            //     .wrap_target
+    0xe027, //  0: set    x, 7            side 0     
+    0x6101, //  1: out    pins, 1         side 0 [1] 
+    0x5001, //  2: in     pins, 1         side 1     
+    0x1041, //  3: jmp    x--, 1          side 1     
+            //     .wrap
+};
+
+static const struct pio_program piospi_program = {
+    .instructions = piospi_program_instructions,
+    .length = 4,
+    .origin = -1,
+    .pio_version = 0,
+#if PICO_PIO_VERSION > 0
+    .used_gpio_ranges = 0x0
+#endif
+};
+
+static inline pio_sm_config piospi_program_get_default_config(uint offset) {
+    pio_sm_config c = pio_get_default_sm_config();
+    sm_config_set_wrap(&c, offset + piospi_wrap_target, offset + piospi_wrap);
+    sm_config_set_sideset(&c, 1, false, false);
+    return c;
+}
+
+static inline pio_sm_config piospi_init(PIO pio, uint sm, uint addr, uint mosi, uint miso, uint clk) {
+    pio_gpio_init(pio, mosi);
+    pio_gpio_init(pio, miso);
+    pio_gpio_init(pio, clk);
+    pio_sm_set_pins_with_mask(pio, sm, 0, (1 << mosi) | (1 << clk));
+    pio_sm_config c = piospi_program_get_default_config(addr);
+    sm_config_set_out_pins(&c, mosi, 1);
+    sm_config_set_in_pins(&c, miso);
+    sm_config_set_set_pins(&c, mosi, 1);
+    sm_config_set_sideset_pins(&c, clk);
+    pio_sm_set_pindirs_with_mask(pio, sm, (1 << mosi) | (1 << clk), (1 << mosi) | (1 << clk));
+    sm_config_set_out_shift(&c, false, true, 8); // pull bytes, MSB first, auto
+    sm_config_set_in_shift(&c, false, true, 8);  // push bytes, MSB first, auto
+#if PICO_RP2040
+    sm_config_set_clkdiv(&c, 18);                // Run at 133/1 = <33MHz (4x data rate)
+#else
+    sm_config_set_clkdiv(&c, 20);                // Run at 150/2 = <19MHz (4x data rate)
+#endif
+    return c;
+}
+
+
+static pio_sm_config s_piospi_sm_config;
+static uint s_piospi_sm_addr;
+
+uint8_t hwspecific_spi_txn(void *arg, uint8_t data) {
+  (void) arg;
+  pio_sm_put(SPIPIO, SPISM, data << 24);
+  return pio_sm_get_blocking(SPIPIO, SPISM);
+}
+
+void hwspecific_spi_init(void) {
+  gpio_init(RSTPIN);
+  gpio_set_dir(RSTPIN, GPIO_OUT);
+  gpio_put(RSTPIN, 0);
+  gpio_init(CSPIN);
+  gpio_set_dir(CSPIN, GPIO_OUT);
+  gpio_put(CSPIN, 1);
+  s_piospi_sm_addr = pio_add_program(SPIPIO, &piospi_program);
+  s_piospi_sm_config = piospi_init(SPIPIO, SPISM, s_piospi_sm_addr, MOSIPIN, MISOPIN, CLKPIN);
+  mg_delayms(2);
+  gpio_put(RSTPIN, 1);
+}
+
+void hwspecific_spi_begin(void *arg) {
+  pio_sm_init(SPIPIO, SPISM, s_piospi_sm_addr, &s_piospi_sm_config);
+  pio_sm_set_enabled(SPIPIO, SPISM, true);
+  gpio_put(CSPIN, 0);
+  (void) arg;
+}
+
+void hwspecific_spi_end(void *arg) {
+  gpio_put(CSPIN, 1);
+  pio_sm_set_enabled(SPIPIO, SPISM, false);
+  (void) arg;
+}
+
+
+// Construct MAC address from the unique board ID
+#include "pico/unique_id.h"
+static inline void hal_ethernet_genmac(unsigned char *mac) {
+  pico_unique_board_id_t board_id;
+  pico_get_unique_board_id(&board_id);
+  mac[0] = 2;
+  memcpy(&mac[1], &board_id.id[3], 5);
+}
diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/main.c b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/main.c
new file mode 100644
index 00000000..eb1d03e4
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/main.c
@@ -0,0 +1,43 @@
+// Copyright (c) 2025 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+#include "hal.h"
+
+
+static const struct mg_tcpip_spi spi = {NULL, hwspecific_spi_begin, hwspecific_spi_end, hwspecific_spi_txn};
+
+
+int main(void) {
+  // initialize stdio
+  stdio_init_all();
+
+  hwspecific_spi_init();
+
+  struct mg_mgr mgr;        // Initialise Mongoose event manager
+  mg_mgr_init(&mgr);        // and attach it to the interface
+  mg_log_set(MG_LL_DEBUG);  // Set log level
+
+  // Initialise Mongoose network stack
+  // Either set use_dhcp or enter a static config.
+  // For static configuration, specify IP/mask/GW in network byte order
+  struct mg_tcpip_if mif = {
+      .ip = 0,
+      .driver = &mg_tcpip_driver_w5500,
+      .driver_data = (void *) &spi
+  };
+
+  hal_ethernet_genmac(mif.mac);
+  mg_tcpip_init(&mgr, &mif);
+  MG_INFO(("Init done, starting main loop"));
+
+  MG_INFO(("Initialising application..."));
+
+  MG_INFO(("Starting event loop"));
+  for (;;) {
+    mg_mgr_poll(&mgr, 0);
+  }
+
+  return 0;
+}
+
diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.c b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.c
new file mode 120000
index 00000000..5e522bbc
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.c
@@ -0,0 +1 @@
+../../../mongoose.c
\ No newline at end of file
diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.h b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.h
new file mode 120000
index 00000000..ee4ac823
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.h
@@ -0,0 +1 @@
+../../../mongoose.h
\ No newline at end of file
diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose_config.h b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose_config.h
new file mode 100644
index 00000000..c8750e1d
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose_config.h
@@ -0,0 +1,6 @@
+#define MG_ARCH MG_ARCH_PICOSDK
+
+#define MG_ENABLE_TCPIP 1
+#define MG_ENABLE_DRIVER_W5500 1
+#define MG_ENABLE_TCPIP_DRIVER_INIT 0
+#define MG_ENABLE_PACKED_FS 1
diff --git a/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/pico_sdk_import.cmake b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/pico_sdk_import.cmake
new file mode 100644
index 00000000..a0721d0d
--- /dev/null
+++ b/tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/pico_sdk_import.cmake
@@ -0,0 +1,84 @@
+# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
+
+# This can be dropped into an external project to help locate this SDK
+# It should be include()ed prior to project()
+
+if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
+    set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
+    message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
+    set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
+    message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
+    set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
+    message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
+endif ()
+
+if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
+    set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
+    message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
+endif ()
+
+if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
+  set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
+  message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
+endif()
+
+set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
+set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
+set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
+set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
+
+if (NOT PICO_SDK_PATH)
+    if (PICO_SDK_FETCH_FROM_GIT)
+        include(FetchContent)
+        set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
+        if (PICO_SDK_FETCH_FROM_GIT_PATH)
+            get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
+            )
+        endif ()
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            FetchContent_Populate(pico_sdk)
+            set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
+        endif ()
+        set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
+    else ()
+        message(FATAL_ERROR
+                "SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
+                )
+    endif ()
+endif ()
+
+get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
+if (NOT EXISTS ${PICO_SDK_PATH})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
+endif ()
+
+set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
+if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
+    message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
+endif ()
+
+set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
+
+include(${PICO_SDK_INIT_CMAKE_FILE})