ESPRESSIF ESP32-WATG-32D Custom WiFi-BT-BLE MCU Module User Manual

ESP32-WATG-32D
User Manual

Preliminary version 0.1
Espressif Systems
Copyright © 2019

About This Guide

This document is intended to help users set up the basic software development environment for developing applications using hardware based on the ESP32WATG- 32D module.

Release Notes

Introduction to ESP32-WATG-32D

ESP32-WATG-32D

ESP32-WATG-32D is a custom WiFi-BT-BLE MCU module for giving the “Connectivity Function” to customer’s different products, including Water Heater and Comfort Heating Systems.
Table 1 provides the specifications of ESP32-WATG-32D.
Table 1: ESP32-WATG-32D Specifications

A-MPDU and A-MSDU aggregat onand 0.4 µ s guard in-terval support
Frequency range| 2400 MHz – 2483.5 MHz
Bluetooth| Protocols| Bluetoothv4.2 BRJEDR and BLE specif cat on
Radio| NZIF receiver with -97 dBm sensitivity
Class- 1,class-2 and class-3 transmitter
AFH
Audio| CVSD and SBC
Hardware| Module interfaces| UART,re. EBUS2,JTAG,GPIO
On-chip sensor| Hall sensor
Integrated crystal| 40 MHz crystal
Integrated SPI flash| 8 MB
I ntegrated DCDC Converter
Operat ng voltage!Power supply| 3.3 V, 1.2 A
12 V / 24 V
Maximum current delivered by power supply| 300 mA
Recommended operat ng tern- perature range| -40’C  + 85’C
Module Dimensions| (18.00±0.15) mm x (31.00±0.15) mm x (3.10±0.15) mm

ESP32-WATG-32D has 35 pins which are described in Table2.

Pin Description

Figure 1: Pin Layout

Table 2: Pin Definitions

ADC1_CH4, TOUCH9, RTC_GPIO9
IO33| 9| I/O| GPIO33, XTAL_32K_N (32.768 kHz crystal oscillator output), ADC1_CH5, TOUCH8, RTC_GPIO8
IO25| 10| I/O| GPIO25, DAC_1, ADC2_CH8, RTC_GPIO6
I2C_SDA| 11| I/O| GPIO26, I2C_SDA
I2C_SCL| 12| I| GPIO27, I2C_SCL
TMS| 13| I/O| GPIO14, MTMS
TDI| 14| I/O| GPIO12, MTDI
+5V| 15| PI| 5 V power supply input
GND| 16, 17| PI| Ground
VIN| 18| I/O| 12 V / 24 V power supply input
TCK| 19| I/O| GPIO13, MTCK
TDO| 20| I/O| GPIO15, MTDO
EBUS2| 21, 35| I/O| GPIO19/GPIO22, EBUS2
IO2| 22| I/O| GPIO2, ADC2_CH2, TOUCH2, RTC_GPIO12, HSPIWP, HS2_DATA0
IO0_FLASH| 23| I/O| Download Boot: 0; SPI Boot: 1(Default).
IO4| 24| I/O| GPIO4, ADC2_CH0, TOUCH0, RTC_GPIO10, HSPIHD, HS2_DATA1
IO16| 25| I/O| GPIO16, HS1_DATA4
5V_UART1_TX D| 27| I| GPIO18, 5V UART Data Receive
5V_UART1_RXD| 28| –| GPIO17, HS1_DATA5
IO17| 28| –| GPIO17, HS1_DATA5
IO5| 29| I/O| GPIO5, VSPICS0, HS1_DATA6
U0RXD| 31| I/O| GPIO3, U0RXD
U0TXD| 30| I/O| GPIO1, U0TXD
IO21| 32| I/O| GPIO21, VSPIHD
GND| 33| PI| EPAD, Ground
+3.3V| 34| PO| 3.3V Power supply output

Hardware Preparation

Hardware Preparation

• ESP32-WATG-32D module
• Espressif RF testing board (Carrier Board)
• One USB-to-UART dongle
• PC, Windows 7 recommended
• Micro-USB cable

Hardware Connection

1. Solder ESP32-WATG-32D to the Carrier Board, as Figure 2 shows.

2. Connect USB-to-UART dongle to the carrier board via TXD, RXD and GND.

3. Connect USB-to-UART dongle to the PC via the Micro-USB cable.

4. Connect the carrier board to 24 V adapter for power supply.

5. During download, short IO0 to GND via a jumper. Then, turn “ON” the board.

6. Download firmware into flash using the ESP32 DOWNLOAD TOOL.

7. After download, remove the jumper on IO0 and GND.

8. Power up the carrier board again. ESP32-WATG-32D will switch to working mode.
   The chip will read programs from flash upon initialization.

Notes:

• IO0 is internally logic high.
• For more information on ESP32-WATG-32D, please refer to ESP32-WATG-32D Datasheet.

Getting Started with ESP32 WATG-32D

ESP-IDF

The Espressif IoT Development Framework (ESP-IDF for short) is a framework for developing applications based on the Espressif ESP32. Users can develop applications with ESP32 in Windows/Linux/MacOS based on ESP-IDF.

Set up the Tools

Aside from the ESP-IDF, you also need to install the tools used by ESP-IDF, such as the compiler, debugger, Python packages, etc.

Standard Setup of Toolchain for Windows
The quickest way is to download the toolchain and MSYS2 zip from dl.espressif.com: https://dl.espressif.com/dl/esp32_win32_msys2_environment_and_toolchain-20181001.zip

Checking out
Run C:\msys32\mingw32.exe to open an MSYS2 terminal. Run: mkdir -p ~/esp
Input cd ~/esp to enter the new directory.

Updating the Environment
When IDF is updated, sometimes new toolchains are required or new requirements are added to the Windows MSYS2 environment. To move any data from an old version of the precompiled environment to a new one:
Take the old MSYS2 environment (ie C:\msys32) and move/rename it to a different directory (ie C:\msys32_old).
Download the new precompiled environment using the steps above.
Unzip the new MSYS2 environment to C:\msys32 (or another location).
Find the old C:\msys32_old\home directory and move this into C:\msys32.
You can now delete the C:\msys32_old directory if you no longer need it.
You can have independent different MSYS2 environments on your system, as long as they are in different directories.

Standard Setup of Toolchain for Linux
Install Prerequisites
CentOS 7：
sudo yum install gcc git wget make ncurses-devel flex bison gperf python pyserial python-pyelftools

sudo apt-get install gcc git wget make libncurses-dev flex bison gperf python pythonpip python-setuptools python-serial python-cryptography python-future python-pyparsing python-pyelftools
Arch：
sudo pacman -S –needed gcc git make ncurses flex bison gperf python2-pyserial python2cryptography python2-future python2-pyparsing python2-pyelftools

Set up The Toolchain
64-bit Linux：https://dl.espressif.com/dl/xtensa-esp32-elf- linux64-esp32-2019r1-8.2.0.tar.gz
32-bit Linux：https://dl.espressif.com/dl/xtensa-esp32-elf- linux32-esp32-2019r1-8.2.0.tar.gz

1. Unzip the file to ~/esp directory:
64-bit Linux：mkdir -p ~/esp cd ~/esp tar -xzf ~/Downloads/xtensa-esp32-elf- linux64-esp32-2019r1-8.2.0.tar.gz
32-bit Linux： mkdir -p ~/espcd ~/esp tar -xzf ~/Downloads/xtensa-esp32-elf- linux32-esp32-2019r1-8.2.0.tar.gz

2. The toolchain will be unzipped to ~/esp/xtensa-esp32-elf/ directory. Add the following to ~/.profile:
export PATH=”$HOME/esp/xtensa-esp32-elf/bin:$PATH”

Optionally, add the following to ~/.profile:
alias get_esp32=’export PATH=”$HOME/esp/xtensa-esp32-elf/bin:$PATH”‘

3. Re-log in to validate .profile. Run the following to check PATH: printenv PATH
$ printenv PATH

/home/user-name/esp/xtensa-esp32-elf/bin:/home/user- name/bin:/home/username/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

Permission issues /dev/ttyUSB0
With some Linux distributions you may get the Failed to open port /dev/ttyUSB0 error message when flashing the ESP32. This can be solved by adding the current user to the dialout group.

Arch Linux Users
To run the precompiled gdb (xtensa-esp32-elf-gdb) in Arch Linux requires ncurses 5, but Arch uses ncurses 6.
Backwards compatibility libraries are available in AUR for native and lib32 configurations:
https://aur.archlinux.org/packages/ncurses5-compat-libs/
https://aur.archlinux.org/packages/lib32-ncurses5-compat-libs/
Before installing these packages you might need to add the author’s public key to your keyring as described in the “Comments” section at the links above.
Alternatively, use crosstool-NG to compile a gdb that links against ncurses 6.

Standard Setup of Toolchain for Mac OS
Install pip:
sudo easy_install pip

Install Toolchain:
https://github.com/espressif/esp-idf/blob/master/docs/en/get- started/macossetup.rst#id1

Unzip the file into ~/esp directory.
The toolchain will be unzipped into ~/esp/xtensa-esp32-elf/ path.
Add the following to ~/.profile:
export PATH=$HOME/esp/xtensa-esp32-elf/bin:$PATH

Optionally, add the following to 〜/ .profile:
alias get_esp32=”export PATH=$HOME/esp/xtensa-esp32-elf/bin:$PATH”
Input get_esp322 to add the toolchain to PATH.

Get ESP-IDF

Once you have the toolchain (that contains programs to compile and build the application) installed, you also need ESP32 specific API / libraries. They are provided by Espressif in ESP-IDF repository. To get it, open terminal, navigate to the directory you want to put ESP-IDF, and clone it using git clone command:

git clone –recursive https://github.com/espressif/esp-idf.git

ESP-IDF will be downloaded into ~/esp/esp-idf.

  Note:
Do not miss the –recursive option. If you have already cloned ESP-IDF without this option, run another command to get all the submodules:
cd ~/esp/esp-idf
git submodule update –init

Add IDF_PATH to User Profile

To preserve setting of IDF_PATH environment variable between system restarts, add it to the user profile, following instructions below.

Windows
Search for “Edit Environment Variables” on Windows 10.
Click New… and add a new system variable IDF_PATH. The configuration should include an ESP-IDF directory, such as C:\Users\user-name\esp\esp-idf.
Add ;%IDF_PATH%\tools to the Path variable to run idf.py and other tools.

Linux and MacOS
Add the following to ~/.profile:
export IDF_PATH=~/esp/esp-idf
export PATH=”$IDF_PATH/tools:$PATH”

Run the following to check IDF_PATH:
printenv IDF_PATH

Run the following to check if idf.py is included in PAT:
which idf.py
It will print a path similar to ${IDF_PATH}/tools/idf.py.
You can also enter the following if you do not want to modify IDF_PATH or PATH:
export IDF_PATH=~/esp/esp-idf
export PATH=”$IDF_PATH/tools:$PATH”

Establish Serial Connection with ESP32-WATG-32D

This section provides guidance how to establish serial connection between ESP32WATG-32D and PC.

Connect ESP32-WATG-32D to PC

Solder ESP32-WATG-32D module to the carrier board and connect carrier board to the PC using the USB-to-UART dongle. If device driver does not install automatically, identify USB to serial converter chip on your external USB-to- UART dongle, search for drivers in internet and install them.
Below are the links to drivers that can be used.
CP210x USB to UART Bridge VCP Drivers FTDI Virtual COM Port Drivers

The drivers above are primarily for reference. Under normal circumstances, the drivers should be bundled with and operating system and automatically installed upon connecting USB-to-UART dongle to the PC.

Check Port on Windows

Check the list of identified COM ports in the Windows Device Manager. Disconnect USB-to-UART dongle and connect it back, to verify which port disappears from the list and then shows back again.

Figure 4-1. USB to UART bridge of USB-to-UART dongle in Windows Device Manager

Figure 4-2. Two USB Serial Ports of USB-to-UART dongle in Windows Device Manager

Check Port on Linux and MacOS

To check the device name for the serial port of your USB-to-UART dongle, run this command two times, first with the dongle unplugged, then with plugged in. The port which appears the second time is the one you need:

Linux
ls /dev/tty*

MacOS
ls /dev/cu.*

Adding User to dialout on Linux

The currently logged user should have read and write access the serial port over USB.
On most Linux distributions, this is done by adding the user to dialout group with the following command:

sudo usermod -a -G dialout $USER
on Arch Linux this is done by adding the user to uucp group with the following command:

sudo usermod -a -G uucp $USER
Make sure you re-login to enable read and write permissions for the serial port.

Verify Serial Connection

Now verify that the serial connection is operational. You can do this using a serial terminal program. In this example we will use PuTTY SSH Client that is available for both Windows and Linux. You can use other serial program and set communication parameters like below.
Run terminal, set identified serial port, baud rate = 115200, data bits = 8, stop bits = 1, and parity = N. Below are example screen shots of setting the port and such transmission parameters (in short described as 115200-8-1-N) on Windows and Linux. Remember to select exactly the same serial port you have identified in steps above.

Figure 4-3. Setting Serial Communication in PuTTY on Windows

Figure 4-4. Setting Serial Communication in PuTTY on Linux

Then open serial port in terminal and check, if you see any log printed out by ESP32.
The log contents will depend on application loaded to ESP32.

Notes:

• For some serial port wiring configurations, the serial RTS & DTR pins need to be disabled in the terminal program before the ESP32 will boot and produce serial output. This depends on the hardware itself, most development boards (including all Espressif boards) do not have this issue. The issue is present if RTS & DTR are wired directly to the EN & GPIO0 pins. See the esptool documentation for more details.
• Close serial terminal after verification that communication is working. In the next step we are going to use a different application to upload a new firmware to
  ESP32. This application will not be able to access serial port while it is open in terminal.

Configure

Enter hello_world directory and run menuconfig.
Linux and MacOS

cd ~/esp/hello_world
idf.py -DIDF_TARGET=esp32 menuconfig

You may need to run python2 idf.py on Python 3.0.
Windows

cd %userprofile%\esp\hello_world idf.py -DIDF_TARGET=esp32 menuconfig

The Python 2.7 installer will attempt to configure Windows to associate a .py file with Python 2. If other programs (such as Visual Studio Python tools) have been associated with other versions of Python, idf.py may not work properly (the file will open in Visual Studio). In this case, you can choose to run C:\Python27\python idf.py every time, or change the Windows .py associated file settings.

Build and Flash

Now you can build and flash the application. Run:
idf.py build

This will compile the application and all the ESP-IDF components, generate bootloader, partition table, and application binaries, and flash these binaries to your ESP32 board.

$ idf.py build
Running cmake in directory /path/to/hello_world/build Executing “cmake -G Ninja –warn-uninitialized /path/to/hello_world”… Warn about uninitialized values.

• Found Git: /usr/bin/git (found version “2.17.0”)
• Building empty aws_iot component due to configuration
• Component names: …
• Component paths: … … (more lines of build system output)

[527/527] Generating hello-world.bin esptool.py v2.3.1

Project build complete. To flash, run this command:
../../../components/esptool_py/esptool/esptool.py -p (PORT) -b 921600 write_flash -flash_mode dio –flash_size detect –flash_freq 40m 0x10000 build /hello-world.bin build 0x1000 build/bootloader/bootloader.bin 0x8000 build/partition_table/partitiontable.bin or run ‘idf.py -p PORT flash’
If there are no issues, at the end of build process, you should see generated .bin files.

Flash onto the Device

Flash the binaries that you just built onto your ESP32 board by running:

idf.py -p PORT [-b BAUD] flash

Replace PORT with your ESP32 board’s serial port name. You can also change the flasher baud rate by replacing BAUD with the baud rate you need. The default baud rate is 460800.

Running esptool.py in directory […]/esp/hello_world Executing “python […]/esp- idf/components/esptool_py/esptool/esptool.py -b 460800 write_flash @flash_project_args”… esptool.py -b 460800 write_flash –flash_mode dio –flash_size detect –flash_freq 40m 0x1000 bootloader/bootloader.bin 0x8000 partition_table/partition-table.bin 0x10000 hello-world.bin esptool.py v2.3.1 Connecting…. Detecting chip type… ESP32 Chip is ESP32D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core  Uploading stub… Running stub… Stub running… Changing baud rate to 460800 Changed. Configuring flash size… Auto-detected Flash size: 4MB Flash params set to 0x0220 Compressed 22992 bytes to 13019… Wrote 22992 bytes (13019 compressed) at 0x00001000 in 0.3 seconds (effective 558.9 kbit/s)… Hash of data verified. Compressed 3072 bytes to 82… Wrote 3072 bytes (82 compressed) at 0x00008000 in 0.0 seconds (effective 5789.3 kbit/ s)… Hash of data verified. Compressed 136672 bytes to 67544… Wrote 136672 bytes (67544 compressed) at 0x00010000 in 1.9 seconds (effective 567.5 kbit/s)… Hash of data verified. Leaving… Hard resetting via RTS pin…

If there are no issues by the end of the flash process, the module will be reset and the “hello_world” application will be running.

IDF Monitor

To check if “hello_world” is indeed running, type idf.py -p PORT monitor (Do not forget to replace PORT with your serial port name).
This command launches the monitor application:

$ idf.py -p /dev/ttyUSB0 monitor Running idf_monitor in directory […]/esp/hello_world/build Executing “python […]/esp-idf/tools/idf_monitor.py -b 115200 […]/esp/hello_world/ build/hello-world.elf”… — idf_monitor on /dev/ttyUSB0 115200 — — Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H — ets Jun 8 2016 00:22:57 rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) ets Jun 8 2016 00:22:57 …

After startup and diagnostic logs scroll up, you should see “Hello world!” printed out by the application.

… Hello world! Restarting in 10 seconds… I (211) cpu_start: Starting scheduler on APP CPU. Restarting in 9 seconds… Restarting in 8 seconds… Restarting in 7 seconds…

To exit IDF monitor use the shortcut Ctrl+].
If IDF monitor fails shortly after the upload, or, if instead of the messages above, you see random garbage similar to what is given below, your board is likely using a 26MHz crystal. Most development board designs use 40MHz, so ESP-IDF uses this frequency as a default value.

Examples

For ESP-IDF examples, please go to ESP-IDF GitHub.

Espressif IoT Team
www.espressif.com

Disclaimer and Copyright Notice
Information in this document, including URL references, is subject to change without notice.
THIS DOCUMENT IS PROVIDED AS IS WITH NO WARRANTIES WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE,
OR ANY WARRANTY OTHERWISE ARISING OUT OF ANY PROPOSAL, SPECIFICATION OR SAMPLE.
All liability, including liability for infringement of any proprietary rights, relating to use of information in this document is disclaimed. No licenses express or implied, by estoppel or otherwise, to any intellectual property rights are granted herein.
The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a registered trademark of Bluetooth SIG. All trade names, trademarks and registered trademarks mentioned in this document are property of their respective owners, and are hereby acknowledged.
Copyright © 2019 Espressif Inc. All rights reserved.

Documents / Resources

| ESPRESSIF ESP32-WATG-32D Custom WiFi-BT-BLE MCU Module [pdf] User Manual
ESP32WATG32D, 2AC7Z-ESP32WATG32D, 2AC7ZESP32WATG32D, ESP32-WATG-32D, Custom WiFi-BT-BLE MCU Module, WiFi-BT-BLE MCU Module, MCU Module, ESP32-WATG-32D, Module
---|---

References

• Espressif Download Server
• Wireless SoCs, Software, Cloud and AIoT Solutions | Espressif Systems
• AUR (en) - lib32-ncurses5-compat-libs
• AUR (en) - ncurses5-compat-libs
• dl.espressif.com/dl/
• GitHub - espressif/esp-idf: Espressif IoT Development Framework. Official development framework for Espressif SoCs.
• GitHub - espressif/esp-idf: Espressif IoT Development Framework. Official development framework for Espressif SoCs.

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