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scaprilescaprile
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Merge pull request #3429 from cesanta/w55rp20
add W55RP20 example
2 parents 564c352 + e83e13d commit eefec28

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‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/CMakeLists.txt‎

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cmake_minimum_required(VERSION 3.13)
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include(pico-sdk/pico_sdk_init.cmake)
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project(firmware)
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pico_sdk_init()
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add_executable(firmware
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main.c
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mongoose.c
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)
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target_include_directories(firmware PUBLIC
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.
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)
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target_link_libraries(firmware hardware_pio pico_stdlib pico_rand)
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pico_add_extra_outputs(firmware) # create map/bin/hex file etc.
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pico_enable_stdio_usb(firmware 1) # Route stdio
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pico_enable_stdio_uart(firmware 0) # to USB
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# Mongoose build flags in mongoose_config.h
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# Example build options

‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/Makefile‎

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RM = rm -rf
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MKBUILD = test -d build || mkdir build
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ifeq ($(OS),Windows_NT)
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RM = cmd /C del /Q /F /S
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MKBUILD = if not exist build mkdir build
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endif
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all example:
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true
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build build/firmware.uf2: pico-sdk main.c
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$(MKBUILD)
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cd build && cmake -G "Unix Makefiles" .. && make
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pico-sdk:
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git clone --depth 1 -b 2.1.0 https://github.com/raspberrypi/pico-sdk $@
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cd $@ && git submodule update --init
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clean:
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$(RM) pico-sdk build
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.PHONY: build
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‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/hal.h‎

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// Copyright (c) 2026 Cesanta Software Limited
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// All rights reserved
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#include "pico/stdlib.h"
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#include "hardware/pio.h"
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extern void mg_delayms(unsigned int ms);
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#define SPIPIO pio0
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#define SPISM 0
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#define MOSIPIN 23
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#define MISOPIN 22
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#define CLKPIN 21
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#define CSPIN 20
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#define RSTPIN 25
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// Try it on a bare Pico !
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// #define MOSIPIN 3
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// #define MISOPIN 4
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// #define CLKPIN 2
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// #define CSPIN 5
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#define piospi_wrap_target 0
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#define piospi_wrap 3
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#define piospi_pio_version 0
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static const uint16_t piospi_program_instructions[] = {
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// .wrap_target
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0xe027, // 0: set x, 7 side 0
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0x6101, // 1: out pins, 1 side 0 [1]
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0x5001, // 2: in pins, 1 side 1
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0x1041, // 3: jmp x--, 1 side 1
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// .wrap
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};
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static const struct pio_program piospi_program = {
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.instructions = piospi_program_instructions,
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.length = 4,
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.origin = -1,
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.pio_version = 0,
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#if PICO_PIO_VERSION > 0
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.used_gpio_ranges = 0x0
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#endif
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};
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static inline pio_sm_config piospi_program_get_default_config(uint offset) {
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pio_sm_config c = pio_get_default_sm_config();
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sm_config_set_wrap(&c, offset + piospi_wrap_target, offset + piospi_wrap);
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sm_config_set_sideset(&c, 1, false, false);
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return c;
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}
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static inline pio_sm_config piospi_init(PIO pio, uint sm, uint addr, uint mosi, uint miso, uint clk) {
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pio_gpio_init(pio, mosi);
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pio_gpio_init(pio, miso);
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pio_gpio_init(pio, clk);
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pio_sm_set_pins_with_mask(pio, sm, 0, (1 << mosi) | (1 << clk));
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pio_sm_config c = piospi_program_get_default_config(addr);
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sm_config_set_out_pins(&c, mosi, 1);
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sm_config_set_in_pins(&c, miso);
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sm_config_set_set_pins(&c, mosi, 1);
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sm_config_set_sideset_pins(&c, clk);
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pio_sm_set_pindirs_with_mask(pio, sm, (1 << mosi) | (1 << clk), (1 << mosi) | (1 << clk));
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sm_config_set_out_shift(&c, false, true, 8); // pull bytes, MSB first, auto
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sm_config_set_in_shift(&c, false, true, 8); // push bytes, MSB first, auto
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#if PICO_RP2040
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sm_config_set_clkdiv(&c, 18); // Run at 133/1 = <33MHz (4x data rate)
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#else
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sm_config_set_clkdiv(&c, 20); // Run at 150/2 = <19MHz (4x data rate)
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#endif
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return c;
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}
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static pio_sm_config s_piospi_sm_config;
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static uint s_piospi_sm_addr;
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uint8_t hwspecific_spi_txn(void *arg, uint8_t data) {
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(void) arg;
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pio_sm_put(SPIPIO, SPISM, data << 24);
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return pio_sm_get_blocking(SPIPIO, SPISM);
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}
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void hwspecific_spi_init(void) {
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gpio_init(RSTPIN);
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gpio_set_dir(RSTPIN, GPIO_OUT);
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gpio_put(RSTPIN, 0);
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gpio_init(CSPIN);
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gpio_set_dir(CSPIN, GPIO_OUT);
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gpio_put(CSPIN, 1);
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s_piospi_sm_addr = pio_add_program(SPIPIO, &piospi_program);
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s_piospi_sm_config = piospi_init(SPIPIO, SPISM, s_piospi_sm_addr, MOSIPIN, MISOPIN, CLKPIN);
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mg_delayms(2);
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gpio_put(RSTPIN, 1);
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}
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void hwspecific_spi_begin(void *arg) {
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pio_sm_init(SPIPIO, SPISM, s_piospi_sm_addr, &s_piospi_sm_config);
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pio_sm_set_enabled(SPIPIO, SPISM, true);
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gpio_put(CSPIN, 0);
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(void) arg;
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}
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void hwspecific_spi_end(void *arg) {
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gpio_put(CSPIN, 1);
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pio_sm_set_enabled(SPIPIO, SPISM, false);
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(void) arg;
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}
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// Construct MAC address from the unique board ID
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#include "pico/unique_id.h"
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static inline void hal_ethernet_genmac(unsigned char *mac) {
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pico_unique_board_id_t board_id;
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pico_get_unique_board_id(&board_id);
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mac[0] = 2;
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memcpy(&mac[1], &board_id.id[3], 5);
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}

‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/main.c‎

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// Copyright (c) 2025 Cesanta Software Limited
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// All rights reserved
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#include "mongoose.h"
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#include "hal.h"
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static const struct mg_tcpip_spi spi = {NULL, hwspecific_spi_begin, hwspecific_spi_end, hwspecific_spi_txn};
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int main(void) {
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// initialize stdio
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stdio_init_all();
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hwspecific_spi_init();
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struct mg_mgr mgr; // Initialise Mongoose event manager
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mg_mgr_init(&mgr); // and attach it to the interface
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mg_log_set(MG_LL_DEBUG); // Set log level
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// Initialise Mongoose network stack
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// Either set use_dhcp or enter a static config.
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// For static configuration, specify IP/mask/GW in network byte order
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struct mg_tcpip_if mif = {
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.ip = 0,
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.driver = &mg_tcpip_driver_w5500,
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.driver_data = (void *) &spi
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};
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hal_ethernet_genmac(mif.mac);
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mg_tcpip_init(&mgr, &mif);
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MG_INFO(("Init done, starting main loop"));
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MG_INFO(("Initialising application..."));
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MG_INFO(("Starting event loop"));
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for (;;) {
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mg_mgr_poll(&mgr, 0);
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}
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return 0;
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}
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‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.c‎

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../../../mongoose.c

‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose.h‎

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../../../mongoose.h

‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/mongoose_config.h‎

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#define MG_ARCH MG_ARCH_PICOSDK
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#define MG_ENABLE_TCPIP 1
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#define MG_ENABLE_DRIVER_W5500 1
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#define MG_ENABLE_TCPIP_DRIVER_INIT 0
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#define MG_ENABLE_PACKED_FS 1

‎tutorials/pico-sdk/w55rp20-evb-pico-picosdk-baremetal-builtin/pico_sdk_import.cmake‎

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# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
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# This can be dropped into an external project to help locate this SDK
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# It should be include()ed prior to project()
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if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
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set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
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message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
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endif ()
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if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
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set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
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message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
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endif ()
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if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
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set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
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message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
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endif ()
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if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
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set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
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message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
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endif ()
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if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
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set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
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message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
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endif()
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set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
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set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
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set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
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set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
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if (NOT PICO_SDK_PATH)
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if (PICO_SDK_FETCH_FROM_GIT)
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include(FetchContent)
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set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
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if (PICO_SDK_FETCH_FROM_GIT_PATH)
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get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
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endif ()
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# GIT_SUBMODULES_RECURSE was added in 3.17
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if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
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FetchContent_Declare(
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pico_sdk
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GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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GIT_SUBMODULES_RECURSE FALSE
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)
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else ()
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FetchContent_Declare(
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pico_sdk
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GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
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GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
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)
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endif ()
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if (NOT pico_sdk)
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message("Downloading Raspberry Pi Pico SDK")
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FetchContent_Populate(pico_sdk)
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set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
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endif ()
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set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
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else ()
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message(FATAL_ERROR
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"SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
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)
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endif ()
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endif ()
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get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
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if (NOT EXISTS ${PICO_SDK_PATH})
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message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
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endif ()
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set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
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if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
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message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
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endif ()
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set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
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include(${PICO_SDK_INIT_CMAKE_FILE})

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