This helps to quick start with the NVDK-ESP32 Development Kit. This demonstrates the brief introduction about NVDK-ESP32, Esperrif IoT Development Framework environment setup, IDF Folder structure, OpenOCD setup, JTAG Debugger setup and communication with the board. Also it demonstrates procedure of loading application binaries and playing with xtensa-esp32-elf-gdb.

1. NVDK-ESP32 Quick Start
Environment Setup, Sample Applications, JTAG Debugger Setup

2. Overview
• Integrated Wi-Fi (2.4 GHz band) and Bluetooth 4.2 on a single chip
• Dual high performance cores, ultra low power co-processor
• Software framework for IoT applications
• ESP32
• Single 2.4GHz WiFi and Bluetooth Low Energy Combo SoC
• Xtensa 32 Bit LX6 Microprocessor upto 600 DMIPS
• 448 KB ROM, 520 KB SRAM, 16 KB SRAM in RTC
• Advanced peripheral interface like GPIO, I2C, I2S, SPI, SD/MMC/SDIO
• Secure boot and Flash Encryption

3. Toolchain Setup
• Download the cross compiler
$ mkdir ~/esp/
$ wget https://dl.espressif.com/dl/xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz
$ tar zxvf xtensa-esp32-elf-linux64-1.22.0-80-g6c4433a-5.2.0.tar.gz
$ export PATH=~/esp/xtensa-esp32-elf/bin:$PATH

4. ESP-IDF Setup
• Espressif IoT Development Framework
• Download ESP-IDF
$ git clone --recursive https://github.com/espressif/esp-idf.git
$ cd ~/esp/esp-idf
$ git submodule update --init
• Setup PATH to ESP-IDF
$ export IDF_PATH=~/esp/esp-idf
• hello_world project
$ cd ~/esp
$ cp -r $IDF_PATH/examples/get-started/hello_world .
• To Configure
$ make menuconfig
• To compile
$ make all

5. ESP32 Default Partition
Flash Start Address Component Path
0x1000 Bootloader build/bootloader/bootloader.bin
0x8000 Singleapp.bin build/partitions_singleapp.bin
0x10000 Application build/hello-world.bin

6. OpenOCD Setup
• Install dependencies
$ sudo apt-get install git make libtool pkg-config autoconf automake texinfo libusb-1.0
• Download sources of ESP32 enabled OpenOCD variant
$ mkdir ~/esp
$ cd ~/esp
$ git clone --recursive https://github.com/espressif/openocd-esp32.git
• Build OpenOCD
$ cd ~/esp/openocd-esp32
$ ./bootstrap
$ ./configure
$ make
$ sudo make install

7. JTAG Debugger Setup
• To connect with JTAG,
$ sudo openocd -s tools/scripts/ -f tcl/interface/ftdi/um232h.cfg -f
tcl/board/esp-wroom-32.cfg
• GNU Debugger
$ xtensa-esp32-elf-gdb
(gdb) target remote :3333
(gdb) mon reset halt
• To load the application firmware
(gdb) mon program_esp32 <application.bin> 0x10000 verify
• To continue with execution
(gdb) continue

8. References
• https://esp-idf.readthedocs.io/en/latest/get-started/index.html
• https://www.espressif.com/en/products/hardware/esp32/overview
• http://esp32.net/
• http://esp-idf.readthedocs.io/en/latest/
• http://esp-idf.readthedocs.io/en/latest/hw-reference/index.html
• https://www.espressif.com/sites/default/files/documentation/esp3
2_technical_reference_manual_en.pdf
• https://www.espressif.com/sites/default/files/documentation/esp3
2_datasheet_en.pdf

9. Web : www.neeveetech.com
E-Mail : nvhariharan@neeveetech.com
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