2022-04-19T19:58:40

05_time/.gitignore

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+/build

05_time/.vscode/c_cpp_properties.json

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+{
+    "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

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+{
+    "files.associations": {
+        "gpio.h": "c"
+    }
+}

05_time/CMakeLists.txt

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+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

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+# 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

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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})

05_time/run

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+#!/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

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+#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);
+    }
+}