first and compiling freertos

docs/examples/ws2812b/RP2040-ETH-WS2812B/C/CMakeLists.txt

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+# Generated Cmake Pico project file
+
+cmake_minimum_required(VERSION 3.13)
+
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+
+# initalize pico_sdk from installed location
+# (note this can come from environment, CMake cache etc)
+#set(PICO_SDK_PATH "D:/Raspberry/Pico-Code/pico-sdk")
+
+# Pull in Raspberry Pi Pico SDK (must be before project)
+include(pico_sdk_import.cmake)
+
+project(RP2040_WS2812B_Test C CXX ASM)
+
+# Initialise the Raspberry Pi Pico SDK
+pico_sdk_init()
+
+# Add executable. Default name is the project name, version 0.1
+
+add_executable(RP2040_WS2812B_Test RP2040_WS2812B_Test.c )
+
+pico_generate_pio_header(RP2040_WS2812B_Test ${CMAKE_CURRENT_LIST_DIR}/ws2812.pio OUTPUT_DIR ${CMAKE_CURRENT_LIST_DIR}/generated)
+
+pico_set_program_name(RP2040_WS2812B_Test "RP2040_WS2812B_Test")
+pico_set_program_version(RP2040_WS2812B_Test "0.1")
+
+pico_enable_stdio_uart(RP2040_WS2812B_Test 0)
+pico_enable_stdio_usb(RP2040_WS2812B_Test 0)
+
+# Add the standard library to the build
+target_link_libraries(RP2040_WS2812B_Test pico_stdlib)
+
+# Add any user requested libraries
+target_link_libraries(RP2040_WS2812B_Test
+        hardware_pio
+        )
+
+pico_add_extra_outputs(RP2040_WS2812B_Test)
+

docs/examples/ws2812b/RP2040-ETH-WS2812B/C/RP2040_WS2812B_Test.c

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+#include <stdio.h>
+#include <stdlib.h>
+
+#include "pico/stdlib.h"
+#include "hardware/pio.h"
+#include "hardware/clocks.h"
+#include "ws2812.pio.h"
+
+void put_pixel(uint32_t pixel_grb)
+{
+    pio_sm_put_blocking(pio0, 0, pixel_grb << 8u);
+}
+void put_rgb(uint8_t red, uint8_t green, uint8_t blue)
+{
+    uint32_t mask = (green << 16) | (red << 8) | (blue << 0);
+    put_pixel(mask);
+}
+
+int main()
+{
+    //set_sys_clock_48();
+    stdio_init_all();
+
+    PIO pio = pio0;
+    int sm = 0;
+    uint offset = pio_add_program(pio, &ws2812_program);
+    uint8_t cnt = 0;
+
+    puts("RP2040-Zero WS2812 Test");
+
+    ws2812_program_init(pio, sm, offset, 25, 800000, true);
+
+    while (1)
+    {
+        for (cnt = 0; cnt < 0xff; cnt++)
+        {
+            put_rgb(cnt, 0xff - cnt, 0);
+            sleep_ms(3);
+        }
+        for (cnt = 0; cnt < 0xff; cnt++)
+        {
+            put_rgb(0xff - cnt, 0, cnt);
+            sleep_ms(3);
+        }
+        for (cnt = 0; cnt < 0xff; cnt++)
+        {
+            put_rgb(0, cnt, 0xff - cnt);
+            sleep_ms(3);
+        }
+    }
+}

docs/examples/ws2812b/RP2040-ETH-WS2812B/C/ReadmeCN.txt

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+/*****************************************************************************
+* | File      	:   Readme_CN.txt
+* | Author      :   
+* | Function    :   Help with use
+* | Info        :
+*----------------
+* |	This version:   V1.0
+* | Date        :   2023-04-23
+* | Info        :   在这里提供一个中文版本的使用文档，以便你的快速使用
+******************************************************************************/
+这个文件是帮助您使用本例程。
+由于我们的LCD越来越多，不便于我们的维护，因此把所有的LCD程序做成一个工程。
+在这里简略的描述本工程的使用：
+
+1.基本信息：
+本例程用于测试或者演示RP2040-ETH上WS2812B;
+
+2.管脚连接：
+DIN    ->    25
+
+3.基本使用：
+你需要执行：
+    如果目录已经存在，则可以直接进入。 如果没有目录，执行:
+         mkdir build
+    进入目录，并添加SDK:
+         cd build
+         export PICO_SDK_PATH=../../pico-sdk
+     其中 ../../pico-sdk 是你的SDK的目录。
+     执行cmake，自动生成Makefile文件:
+         cmake ..
+     执行make生成可执行文件，然后在终端中输入：
+         make
+     编译好的uf2文件复制到pico中即可
+

docs/examples/ws2812b/RP2040-ETH-WS2812B/C/ReadmeEN.txt

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+/*****************************************************************************
+* | File      	:   Readme_EN.txt
+* | Author      :   
+* | Function    :   Help with use
+* | Info        :
+*----------------
+* |	This version:   V1.0
+* | Date        :   2021-02-04
+* | Info        :   Here is an English version of the documentation for your quick use.
+******************************************************************************/
+This file is to help you use this routine.
+Since our ink screens are getting more and more, it is not convenient for our maintenance, so all the ink screen programs are made into one project.
+A brief description of the use of this project is here:
+
+1. Basic information:
+This routine is used to test or demonstrate WS2812B on RP2040-ETH.
+
+2. Pin connection:
+Pin connection You can look at dev_config.c/h in \lib\Config. Again, here:
+DIN    ->    25
+
+3. Basic use:
+You need to execute:
+    If the directory already exists, you can go directly. If there is no build directory, execute
+         mkdir build
+     Enter the build directory and type in the terminal:
+         cd build
+         export PICO_SDK_PATH=../../pico-sdk
+     Where ../../pico-sdk is your installed SDK directory
+     Execute cmake, automatically generate Makefile file, enter in the terminal:
+         cmake ..
+     Execute make to generate an executable file, and enter in the terminal:
+         make
+     Copy the compiled uf2 file to pico
+

docs/examples/ws2812b/RP2040-ETH-WS2812B/C/generated/ws2812.pio.h

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+// -------------------------------------------------- //
+// This file is autogenerated by pioasm; do not edit! //
+// -------------------------------------------------- //
+
+#pragma once
+
+#if !PICO_NO_HARDWARE
+#include "hardware/pio.h"
+#endif
+
+// ------ //
+// ws2812 //
+// ------ //
+
+#define ws2812_wrap_target 0
+#define ws2812_wrap 3
+
+#define ws2812_T1 2
+#define ws2812_T2 5
+#define ws2812_T3 3
+
+static const uint16_t ws2812_program_instructions[] = {
+            //     .wrap_target
+    0x6221, //  0: out    x, 1            side 0 [2] 
+    0x1123, //  1: jmp    !x, 3           side 1 [1] 
+    0x1400, //  2: jmp    0               side 1 [4] 
+    0xa442, //  3: nop                    side 0 [4] 
+            //     .wrap
+};
+
+#if !PICO_NO_HARDWARE
+static const struct pio_program ws2812_program = {
+    .instructions = ws2812_program_instructions,
+    .length = 4,
+    .origin = -1,
+};
+
+static inline pio_sm_config ws2812_program_get_default_config(uint offset) {
+    pio_sm_config c = pio_get_default_sm_config();
+    sm_config_set_wrap(&c, offset + ws2812_wrap_target, offset + ws2812_wrap);
+    sm_config_set_sideset(&c, 1, false, false);
+    return c;
+}
+
+#include "hardware/clocks.h"
+static inline void ws2812_program_init(PIO pio, uint sm, uint offset, uint pin, float freq, bool rgbw) {
+    pio_gpio_init(pio, pin);
+    pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
+    pio_sm_config c = ws2812_program_get_default_config(offset);
+    sm_config_set_sideset_pins(&c, pin);
+    sm_config_set_out_shift(&c, false, true, rgbw ? 32 : 24);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+    int cycles_per_bit = ws2812_T1 + ws2812_T2 + ws2812_T3;
+    float div = clock_get_hz(clk_sys) / (freq * cycles_per_bit);
+    sm_config_set_clkdiv(&c, div);
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, true);
+}
+
+#endif
+

docs/examples/ws2812b/RP2040-ETH-WS2812B/C/pico_sdk_import.cmake

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+# 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 ()
+
+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")
+
+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 ()
+        FetchContent_Declare(
+                pico_sdk
+                GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                GIT_TAG master
+        )
+        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})

docs/examples/ws2812b/RP2040-ETH-WS2812B/C/ws2812.pio

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+;
+; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+;
+; SPDX-License-Identifier: BSD-3-Clause
+;
+
+.program ws2812
+.side_set 1
+
+.define public T1 2
+.define public T2 5
+.define public T3 3
+
+.lang_opt python sideset_init = pico.PIO.OUT_HIGH
+.lang_opt python out_init     = pico.PIO.OUT_HIGH
+.lang_opt python out_shiftdir = 1
+
+.wrap_target
+bitloop:
+    out x, 1       side 0 [T3 - 1] ; Side-set still takes place when instruction stalls
+    jmp !x do_zero side 1 [T1 - 1] ; Branch on the bit we shifted out. Positive pulse
+do_one:
+    jmp  bitloop   side 1 [T2 - 1] ; Continue driving high, for a long pulse
+do_zero:
+    nop            side 0 [T2 - 1] ; Or drive low, for a short pulse
+.wrap
+
+% c-sdk {
+#include "hardware/clocks.h"
+
+static inline void ws2812_program_init(PIO pio, uint sm, uint offset, uint pin, float freq, bool rgbw) {
+
+    pio_gpio_init(pio, pin);
+    pio_sm_set_consecutive_pindirs(pio, sm, pin, 1, true);
+
+    pio_sm_config c = ws2812_program_get_default_config(offset);
+    sm_config_set_sideset_pins(&c, pin);
+    sm_config_set_out_shift(&c, false, true, rgbw ? 32 : 24);
+    sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
+
+    int cycles_per_bit = ws2812_T1 + ws2812_T2 + ws2812_T3;
+    float div = clock_get_hz(clk_sys) / (freq * cycles_per_bit);
+    sm_config_set_clkdiv(&c, div);
+
+    pio_sm_init(pio, sm, offset, &c);
+    pio_sm_set_enabled(pio, sm, true);
+}
+%}