working QEMU for ESP32

Author: vs4vijay

.gitignore

@@ -0,0 +1,3 @@
+build/
+
+*.bin

.vscode/settings.json

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+{
+    "cmake.sourceDirectory": "/workspaces/iot-playground/demo_esp_idf/firstproj"
+}

README.md

@@ -75,7 +75,7 @@ esptool.py --chip esp32s3 merge_bin --output M5CardRemote.M5Cardputer.bin \
 ### Install ESP IDF
 
 ```bash
-sudo apt-get install git wget flex bison gperf python3 python3-pip python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
+sudo apt install git wget flex bison gperf python3 python3-pip python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
 
 mkdir ~/esp
 
@@ -102,7 +102,9 @@ idf.py build
 ### Merge bootloader, partiotion table with app
 
 ```bash
-esptool.py --chip esp32s3 merge_bin -o ../Demo.ESP_IDF.bin --fill-flash-size 4MB @flash_args
+cd build/
+
+esptool.py --chip esp32 merge_bin -o ../firmware.bin --fill-flash-size 4MB @flash_args
 ```
 
 ### Other commands
@@ -124,10 +126,26 @@ idf.py add-dependency
 - Install esptool.py - `pip install -U esptool`
 
 ```bash
-
 esptool write_flash -z 0 name.bin
+```
+
+## QEMU Emulation
+
+```bash
+# Install pre-requisites
+sudo apt install -y libgcrypt20 libglib2.0-0 libpixman-1-0 libsdl2-2.0-0 libslirp0
+
+# Install
+idf_tools.py install qemu-xtensa qemu-riscv32
+
+# Reload env.
+. ~/esp/esp-idf/export.sh
+
+# Boot firmware image
+qemu-system-xtensa -machine esp32 -nographic -drive file=firmware1.bin,if=mtd,format=raw
 
 ```
+
 ---
 
 ### Development Notes

demo_esp_idf/.gitignore

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+build/

demo_esp_idf/firstproj/CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(firstproj)

demo_esp_idf/firstproj/main/CMakeLists.txt

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+idf_component_register(SRCS "firstproj.c"
+                    INCLUDE_DIRS ".")

demo_esp_idf/firstproj/main/firstproj.c

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+#include <stdio.h>
+#include "esp_log.h"
+
+void app_main(void)
+{
+    ESP_LOGI("firstproj", "Started first project");
+
+    // while (true)
+    // {
+    //     ESP_LOGI("firstproj", "in the loop");
+    // }
+    
+}