feat(hello_world): add example hello_world from esp-idf and modify it for ESP8266

Commit ID: b0456cc9

examples/get-started/hello_world/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(hello-world)

examples/get-started/hello_world/Makefile

@@ -3,7 +3,7 @@
 # project subdirectory.
 #
 
-PROJECT_NAME := project_template
+PROJECT_NAME := hello-world
 
 include $(IDF_PATH)/make/project.mk
 

examples/get-started/hello_world/README.md

@@ -0,0 +1,5 @@
+# Hello World Example
+
+Starts a FreeRTOS task to print "Hello World"
+
+See the README.md file in the upper level 'examples' directory for more information about examples.

examples/get-started/hello_world/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "hello_world_main.c"
+                    INCLUDE_DIRS "")

examples/get-started/hello_world/main/hello_world_main.c

@@ -0,0 +1,38 @@
+/* Hello World Example
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "esp_system.h"
+#include "esp_spi_flash.h"
+
+
+void app_main()
+{
+    printf("Hello world!\n");
+
+    /* Print chip information */
+    esp_chip_info_t chip_info;
+    esp_chip_info(&chip_info);
+    printf("This is ESP8266 chip with %d CPU cores, WiFi, ",
+            chip_info.cores);
+
+    printf("silicon revision %d, ", chip_info.revision);
+
+    printf("%dMB %s flash\n", spi_flash_get_chip_size() / (1024 * 1024),
+            (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");
+
+    for (int i = 10; i >= 0; i--) {
+        printf("Restarting in %d seconds...\n", i);
+        vTaskDelay(1000 / portTICK_PERIOD_MS);
+    }
+    printf("Restarting now.\n");
+    fflush(stdout);
+    esp_restart();
+}

examples/get-started/project_template/CMakeLists.txt

@@ -1,6 +0,0 @@
-# The following four lines of boilerplate have to be in your project's CMakeLists
-# in this exact order for cmake to work correctly
-cmake_minimum_required(VERSION 3.5)
-
-include($ENV{IDF_PATH}/tools/cmake/project.cmake)
-project(project_template)

examples/get-started/project_template/components/CMakeLists.txt

@@ -1,3 +0,0 @@
-set(COMPONENT_SRCDIRS "folder1" "folder2")
-
-register_component()

examples/get-started/project_template/components/component.mk

@@ -1 +0,0 @@
-COMPONENT_SRCDIRS := folder1 folder2

examples/get-started/project_template/main/CMakeLists.txt

@@ -1,3 +0,0 @@
-set(COMPONENT_SRCS "user_main.c")
-
-register_component()

examples/get-started/project_template/main/user_main.c

@@ -1,22 +0,0 @@
-/*
-   This example code is in the Public Domain (or CC0 licensed, at your option.)
-
-   Unless required by applicable law or agreed to in writing, this
-   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
-   CONDITIONS OF ANY KIND, either express or implied.
-*/
-
-#include <stdio.h>
-
-#include "esp_system.h"
-
-/******************************************************************************
- * FunctionName : app_main
- * Description  : entry of user application, init user function here
- * Parameters   : none
- * Returns      : none
-*******************************************************************************/
-void app_main(void)
-{
-    printf("SDK version:%s\n", esp_get_idf_version());
-}

examples/get-started/project_template/readme.txt

@@ -1,56 +0,0 @@
-This is a simple project template.
-
-sample_lib is an example for multi-level folder Makefile, notice the folder structure and each Makefile, you can get the clue.
-
-
-HOWTO:
-1. Copy this folder to anywhere.
-Example:
-   Copy to ~/workspace/project_template
-   You can rename this folder as you like.
-
-2. Export SDK_PATH and BIN_PATH.
-Example:
-   Your SDK path is ~/esp_iot_rtos_sdk, and want generate bin at ~/esp8266_bin.
-   Do follow steps:
-     1>. export SDK_PATH=~/esp_iot_rtos_sdk
-     2>. export BIN_PATH=~/esp8266_bin
-   SDK and project are seperate, you can update SDK without change your project.
-
-3. Enter project_template folder, run ./gen_misc.sh, and follow the tips and steps.
-
-
-Compile Options:
-(1) COMPILE
-    Possible value: xcc
-    Default value:
-    If not set, use gcc by default.
-
-(2) BOOT
-    Possible value: none/old/new
-      none: no need boot
-      old: use boot_v1.1
-      new: use boot_v1.2
-    Default value: new
-
-(3) APP
-    Possible value: 0/1/2
-      0: original mode, generate eagle.app.v6.flash.bin and eagle.app.v6.irom0text.bin
-      1: generate user1
-      2: generate user2
-    Default value: 0
-
-(3) SPI_SPEED
-    Possible value: 20/26.7/40/80
-    Default value: 40
-
-(4) SPI_MODE
-    Possible value: QIO/QOUT/DIO/DOUT
-    Default value: QIO
-
-(4) SPI_SIZE_MAP
-    Possible value: 0/2/3/4/5/6
-    Default value: 0
-
-For example:
-    make COMPILE=gcc BOOT=new APP=1 SPI_SPEED=40 SPI_MODE=QIO SPI_SIZE_MAP=0