2022-04-19T19:58:40

01_blink/.vscode/c_cpp_properties.json

@@ -4,7 +4,7 @@
             "name": "Linux GCC ARM",
             "includePath": [
                 "${workspaceFolder}/**",
-                "${workspaceFolder}/../../../pico-sdk/src/**"
+                "${env:PICO_SDK_PATH}/src/**"
             ],
             "defines": [],
             "compilerPath": "/usr/bin/gcc",

02_hello_serial/.vscode/c_cpp_properties.json

@@ -4,7 +4,7 @@
             "name": "Linux GCC ARM",
             "includePath": [
                 "${workspaceFolder}/**",
-                "${workspaceFolder}/../../../pico-sdk/src/**"
+                "${env:PICO_SDK_PATH}/src/**"
             ],
             "defines": [],
             "compilerPath": "/usr/bin/gcc",

02_hello_serial/src/hello.c

@@ -1,9 +1,10 @@
 #include <stdio.h>
+#include <string.h>
 #include "pico/stdlib.h"
 #include "hardware/gpio.h"
 #include "pico/binary_info.h"
 
-const uint LED_PIN = 25;
+const uint LED_PIN = PICO_DEFAULT_LED_PIN;
 
 int main()
 {
@@ -15,12 +16,14 @@ int main()
     gpio_init(LED_PIN);
     gpio_set_dir(LED_PIN, GPIO_OUT);
 
+    char *str = "Hello World!";
+
     while (true)
     {
         gpio_put(LED_PIN, false);
         sleep_ms(250);
         gpio_put(LED_PIN, true);
-        puts("Hello World~~!");
+        puts(str);
         sleep_ms(1000);
     }
 }

03_data_types/.vscode/c_cpp_properties.json

@@ -4,7 +4,7 @@
             "name": "Linux GCC ARM",
             "includePath": [
                 "${workspaceFolder}/**",
-                "${workspaceFolder}/../../../pico-sdk/src/**"
+                "${env:PICO_SDK_PATH}/src/**"
             ],
             "defines": [],
             "compilerPath": "/usr/bin/gcc",

04_watchdog/.gitignore

@@ -0,0 +1 @@
+/build

04_watchdog/.vscode/c_cpp_properties.json

@@ -0,0 +1,18 @@
+{
+    "configurations": [
+        {
+            "name": "Linux GCC ARM",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${env:PICO_SDK_PATH}/src/**"
+            ],
+            "defines": [],
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "linux-gcc-arm",
+            "configurationProvider": "ms-vscode.cmake-tools"
+        }
+    ],
+    "version": 4
+}

04_watchdog/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.13)
+
+include(pico_sdk_import.cmake)
+
+project(watchdog C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+pico_sdk_init()
+
+add_executable(watchdog
+    src/watchdog.c
+)
+
+pico_set_program_name(watchdog "Watch Dog")
+pico_set_program_version(watchdog "0.1.0")
+
+pico_enable_stdio_usb(watchdog 1) # 표준 출력을 USB로
+pico_enable_stdio_uart(watchdog 0) # 표준 출력을 UART로, 안함.
+
+pico_add_extra_outputs(watchdog)
+
+target_link_libraries(watchdog pico_stdlib)

04_watchdog/pico_sdk_import.cmake

@@ -0,0 +1,62 @@
+# 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})

04_watchdog/run

@@ -0,0 +1,43 @@
+#!/usr/bin/bash
+export PICO_SDK_PATH="/media/elex/UltraFit/pico-sdk"
+
+function fn_clean {
+    if [ -d ./build ]
+    then
+        rm -r ./build    
+    fi
+    mkdir build
+}
+
+function fn_cmake {
+    cd build
+    cmake ..
+    cd ..
+}
+
+function fn_make {
+    cd build
+    make
+    cd ..
+}
+
+if [ -z $1 ]
+then
+    fn_clean
+    fn_cmake
+    fn_make
+elif [ $1 == 'clean' ]
+then
+    echo 'Cleaning build dir.'
+    fn_clean
+elif [ $1 == 'cmake' ]
+then
+    echo 'Exec cmake'
+    fn_cmake
+elif [ $1 == 'make' ]
+then
+    echo 'Exec make'
+    fn_make
+else
+    echo 'What do you want???'
+fi

04_watchdog/src/watchdog.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "hardware/watchdog.h"
+#include "hardware/gpio.h"
+#include "pico/binary_info.h"
+
+const uint LED_PIN = PICO_DEFAULT_LED_PIN;
+
+int main()
+{
+    bi_decl(bi_program_description("Watchdog Test"));
+    bi_decl(bi_1pin_with_name(LED_PIN, "On-board LED"));
+
+    stdio_init_all();
+
+    if (watchdog_caused_reboot())
+    {
+        puts("Rebooted by Watchdog");
+    }
+    else
+    {
+        puts("Clean boot");
+    }
+
+    // 3초 이상 반응이 없으면 리부트.
+    watchdog_enable(3000, false);
+
+    gpio_init(LED_PIN);
+    gpio_set_dir(LED_PIN, GPIO_OUT);
+
+    while (true)
+    {
+        // 루프가 한 번 돌 때마다 워치독을 업데이트한다.
+        watchdog_update();
+
+        printf("Currently, %u\n", time_us_32());
+
+        gpio_put(LED_PIN, true);
+        sleep_ms(250);
+        gpio_put(LED_PIN, false);
+
+        sleep_ms(1000);
+        if (time_us_32() > 15000000)
+        {
+            // 테스트를 위해서 5초가 소요되는 작업을 한다.
+            // 워치독에 의해서 리부트될 것이다.
+            sleep_ms(5000);
+        }
+    }
+}

05_time/.gitignore

@@ -0,0 +1 @@
+/build

05_time/.vscode/c_cpp_properties.json

@@ -0,0 +1,18 @@
+{
+    "configurations": [
+        {
+            "name": "Linux GCC ARM",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${env:PICO_SDK_PATH}/src/**"
+            ],
+            "defines": [],
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "linux-gcc-arm",
+            "configurationProvider": "ms-vscode.cmake-tools"
+        }
+    ],
+    "version": 4
+}

05_time/.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "gpio.h": "c"
+    }
+}

05_time/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.13)
+
+include(pico_sdk_import.cmake)
+
+project(time C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+pico_sdk_init()
+
+add_executable(time
+    src/time.c
+)
+
+pico_set_program_name(time "Time")
+pico_set_program_version(time "0.1.0")
+
+pico_enable_stdio_usb(time 1) # 표준 출력을 USB로
+pico_enable_stdio_uart(time 0) # 표준 출력을 UART로, 안함.
+
+pico_add_extra_outputs(time)
+
+target_link_libraries(time pico_stdlib)

05_time/README.md

@@ -0,0 +1,54 @@
+# pico/time.h
+
+## 시간
+
+### 현재 시간
+
+현재 시간을 가져옵니다.
+
+-   `static absolute_time_t get_absolute_time (void)`
+
+### 특정 시간
+
+절대 시간의 값을 부팅 이후 경과된 시간에 해당하는 시간 값으로 지정합니다.
+
+-   `static void update_us_since_boot (absolute_time_t *t, uint64_t us_since_boot)`
+
+### 변환
+
+절대 시간을 마이크로 초 또는 밀리토 단위로 변환합니다.
+
+-   `static uint64_t to_us_since_boot (absolute_time_t t)`
+-   `static uint32_t to_ms_since_boot (absolute_time_t t)`
+
+### 연산
+
+절대 시간에 마이크로 초 또는 밀리 초 값을 더합니다.
+
+-   `static absolute_time_t delayed_by_us (const absolute_time_t t, uint64_t us)`
+-   `static absolute_time_t delayed_by_ms (const absolute_time_t t, uint32_t ms)`
+-   `static absolute_time_t make_timeout_time_us (uint64_t us)`
+-   `static absolute_time_t make_timeout_time_ms (uint32_t ms)`
+
+### 시간 차
+
+두 절대 시간 사이의 간격을 마이크로 초 단위로 반환합니다.
+
+-   `static int64_t absolute_time_diff_us (absolute_time_t from, absolute_time_t to)`
+
+### 널
+
+시간 값이 널인지 여부를 확인합니다.
+
+-   `static bool is_nil_time (absolute_time_t t)`
+
+# hardware/timer.h
+
+## 현재 시간
+
+부팅 이후 경과된 시간 값을 마이크로 초 단위로 반환합니다.
+
+-   `static uint32_t time_us_32 (void)`
+    1시간 11분 정도 이후에 0으로 돌아옵니다.
+-   `uint64_t time_us_64 (void)`
+    58만년 이상 계속해서 증가합니다.

05_time/pico_sdk_import.cmake

@@ -0,0 +1,62 @@
+# 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})

05_time/run

@@ -0,0 +1,43 @@
+#!/usr/bin/bash
+export PICO_SDK_PATH="/media/elex/UltraFit/pico-sdk"
+
+function fn_clean {
+    if [ -d ./build ]
+    then
+        rm -r ./build    
+    fi
+    mkdir build
+}
+
+function fn_cmake {
+    cd build
+    cmake ..
+    cd ..
+}
+
+function fn_make {
+    cd build
+    make
+    cd ..
+}
+
+if [ -z $1 ]
+then
+    fn_clean
+    fn_cmake
+    fn_make
+elif [ $1 == 'clean' ]
+then
+    echo 'Cleaning build dir.'
+    fn_clean
+elif [ $1 == 'cmake' ]
+then
+    echo 'Exec cmake'
+    fn_cmake
+elif [ $1 == 'make' ]
+then
+    echo 'Exec make'
+    fn_make
+else
+    echo 'What do you want???'
+fi

05_time/src/time.c

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/time.h"
+#include "hardware/timer.h"
+#include "hardware/gpio.h"
+#include "pico/binary_info.h"
+
+const uint LED_PIN = PICO_DEFAULT_LED_PIN;
+
+int main()
+{
+    bi_decl(bi_program_description("Time"));
+    bi_decl(bi_1pin_with_name(LED_PIN, "On-board LED"));
+
+    stdio_init_all();
+
+    gpio_init(LED_PIN);
+    gpio_set_dir(LED_PIN, GPIO_OUT);
+
+    while (true)
+    {
+        printf("%u %u\n", to_us_since_boot(get_absolute_time()), time_us_32());
+
+        gpio_put(LED_PIN, true);
+        sleep_ms(250);
+        gpio_put(LED_PIN, false);
+
+        sleep_ms(2000);
+    }
+}

06_timer/.gitignore

@@ -0,0 +1 @@
+/build

06_timer/.vscode/c_cpp_properties.json

@@ -0,0 +1,18 @@
+{
+    "configurations": [
+        {
+            "name": "Linux GCC ARM",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${env:PICO_SDK_PATH}/src/**"
+            ],
+            "defines": [],
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "c11",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "linux-gcc-arm",
+            "configurationProvider": "ms-vscode.cmake-tools"
+        }
+    ],
+    "version": 4
+}

06_timer/.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+    "files.associations": {
+        "gpio.h": "c"
+    }
+}

06_timer/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.13)
+
+include(pico_sdk_import.cmake)
+
+project(timer C CXX ASM)
+set(CMAKE_C_STANDARD 11)
+set(CMAKE_CXX_STANDARD 17)
+pico_sdk_init()
+
+add_executable(timer
+    src/timer.c
+)
+
+pico_set_program_name(timer "Timer")
+pico_set_program_version(timer "0.1.0")
+
+pico_enable_stdio_usb(timer 1) # 표준 출력을 USB로
+pico_enable_stdio_uart(timer 0) # 표준 출력을 UART로, 안함.
+
+pico_add_extra_outputs(timer)
+
+target_link_libraries(timer pico_stdlib)

06_timer/pico_sdk_import.cmake

@@ -0,0 +1,62 @@
+# 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})

06_timer/run

@@ -0,0 +1,43 @@
+#!/usr/bin/bash
+export PICO_SDK_PATH="/media/elex/UltraFit/pico-sdk"
+
+function fn_clean {
+    if [ -d ./build ]
+    then
+        rm -r ./build    
+    fi
+    mkdir build
+}
+
+function fn_cmake {
+    cd build
+    cmake ..
+    cd ..
+}
+
+function fn_make {
+    cd build
+    make
+    cd ..
+}
+
+if [ -z $1 ]
+then
+    fn_clean
+    fn_cmake
+    fn_make
+elif [ $1 == 'clean' ]
+then
+    echo 'Cleaning build dir.'
+    fn_clean
+elif [ $1 == 'cmake' ]
+then
+    echo 'Exec cmake'
+    fn_cmake
+elif [ $1 == 'make' ]
+then
+    echo 'Exec make'
+    fn_make
+else
+    echo 'What do you want???'
+fi

06_timer/src/timer.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include "pico/stdlib.h"
+#include "pico/time.h"
+#include "hardware/timer.h"
+#include "pico/binary_info.h"
+
+// 알람 고유 번호와 사용자 데이터를 매개 변수로 전달 받습니다.
+int64_t alarm_callback(alarm_id_t id, void *user_data)
+{
+    printf("Timer %d fired!\n", (int)id);
+
+    // 반환값으로 마이크로 초 단위의 값을 사용해서 경과 시간 후 다시 실행되도록 지정할 수 있습니다.
+    return 0;
+}
+
+bool repeating_timer_callback(struct repeating_timer *t)
+{
+    printf("Repeat at %lld\n", time_us_64());
+    // false를 반환하면 반복이 중단됩니다.
+    return true;
+}
+
+int main()
+{
+    bi_decl(bi_program_description("Timer"));
+
+    stdio_init_all();
+    alarm_pool_init_default();
+
+    alarm_id_t alarmId = add_alarm_in_ms(10000, alarm_callback, NULL, false);
+
+    struct repeating_timer timer;
+    add_repeating_timer_ms(1500, repeating_timer_callback, NULL, &timer);
+
+    while (true)
+    {
+        printf("Currently, %u", time_us_32());
+        sleep_ms(1000);
+    }
+}