Wireless Stick Lite (V3)
Overview
HelTec Wireless Stick Lite (V3) is a development board with Wi-Fi, Bluetooth and LoRa support. It is designed and produced by HelTec Automation(TM). [1]
Hardware
The main hardware features are:
ESP32-S3FN8 low-power MCU-based SoC (dual-core Xtensa® 32-bit LX7 microprocessor, five stage pipeline rack Structure, main frequency up to 240 MHz).
Semtech SX1262 LoRa node chip
Type-C USB interface with a complete voltage regulator, ESD protection, short circuit protection, RF shielding, and other protection measures (note: you need an USB-A to USB-C cable if you want to power-up the board from USB).
Onboard SH1.25-2 battery interface, integrated lithium battery management system (charge and discharge management, overcharge protection, battery power detection, USB / battery power automatic switching).
Integrated WiFi and Bluetooth interfaces with 2.4GHz metal spring antenna and reserved IPEX (U.FL) interface for LoRa use.
Integrated CP2102 USB to serial port chip, convenient for program downloading, debugging information printing.
Good RF circuit design and low-power design.
Supported Features
The heltec_wireless_stick_lite_v3 board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
heltec_wireless_stick_lite_v3/esp32s3/appcpu target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
Espressif Xtensa LX7 CPU2 |
|
ADC |
on-chip |
ESP32 ADC2 |
|
Bluetooth |
on-chip |
Bluetooth HCI for Espressif ESP321 |
|
CAN |
on-chip |
ESP32 Two-Wire Automotive Interface (TWAI)1 |
|
Clock control |
on-chip |
ESP32 RTC (Power & Clock Controller Module) Module1 |
|
Counter |
on-chip |
ESP32 Counter Driver based on RTC Main Timer1 |
|
on-chip |
|||
DMA |
on-chip |
ESP32 GDMA (General Direct Memory Access)1 |
|
Flash controller |
on-chip |
ESP32 flash controller1 |
|
GPIO & Headers |
on-chip |
ESP32 GPIO controller2 |
|
I2C |
on-chip |
ESP32 I2C2 |
|
I2S |
on-chip |
ESP32 I2S2 |
|
Input |
on-chip |
ESP32 touch sensor input1 |
|
Interrupt controller |
on-chip |
ESP32 Interrupt controller1 |
|
IPM |
on-chip |
ESP32 soft inter processor message1 |
|
Mailbox |
on-chip |
ESP32 soft mailbox1 |
|
Memory controller |
on-chip |
ESP32 pseudo-static RAM controller1 |
|
MTD |
on-chip |
Flash node1 |
|
on-chip |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Pin control |
on-chip |
ESP32 pin controller1 |
|
PWM |
on-chip |
ESP32 LED Control (LEDC)1 |
|
on-chip |
ESP32 Motor Control Pulse Width Modulator (MCPWM)2 |
||
RNG |
on-chip |
ESP32 TRNG (True Random Number Generator)1 |
|
SDHC |
on-chip |
ESP32 SDHC controller1 |
|
on-chip |
ESP32 SDHC controller slot2 |
||
Sensors |
on-chip |
ESP32 temperature sensor1 |
|
on-chip |
ESP32 Pulse Counter (PCNT)1 |
||
Serial controller |
on-chip |
ESP32 UART3 |
|
on-chip |
ESP32 UART1 |
||
SPI |
on-chip |
ESP32 SPI2 |
|
SRAM |
on-chip |
Generic on-chip SRAM description2 |
|
Video |
on-chip |
ESP32 LCD CAM Peripheral interface1 |
|
Watchdog |
on-chip |
ESP32 XT Watchdog Timer1 |
|
on-chip |
ESP32 watchdog2 |
||
Wi-Fi |
on-chip |
ESP32 SoC Wi-Fi1 |
heltec_wireless_stick_lite_v3/esp32s3/procpu target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
Espressif Xtensa LX7 CPU2 |
|
ADC |
on-chip |
||
Bluetooth |
on-chip |
Bluetooth HCI for Espressif ESP321 |
|
CAN |
on-chip |
ESP32 Two-Wire Automotive Interface (TWAI)1 |
|
Clock control |
on-chip |
ESP32 RTC (Power & Clock Controller Module) Module1 |
|
Counter |
on-chip |
ESP32 Counter Driver based on RTC Main Timer1 |
|
on-chip |
ESP32 general-purpose timers4 |
||
DMA |
on-chip |
ESP32 GDMA (General Direct Memory Access)1 |
|
Flash controller |
on-chip |
ESP32 flash controller1 |
|
GPIO & Headers |
on-chip |
ESP32 GPIO controller2 |
|
I2C |
on-chip |
ESP32 I2C2 |
|
I2S |
on-chip |
ESP32 I2S2 |
|
IIO |
on-board |
Description for a voltage divider, with optional ability to measure resistance of the upper leg1 |
|
Input |
on-chip |
ESP32 touch sensor input1 |
|
on-board |
Group of GPIO-bound input keys1 |
||
Interrupt controller |
on-chip |
ESP32 Interrupt controller1 |
|
IPM |
on-chip |
ESP32 soft inter processor message1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
on-board |
Group of PWM-controlled LEDs1 |
||
LoRa |
on-board |
Semtech SX1262 LoRa Modem1 |
|
Mailbox |
on-chip |
ESP32 soft mailbox1 |
|
Memory controller |
on-chip |
ESP32 pseudo-static RAM controller1 |
|
MTD |
on-chip |
Flash node1 |
|
on-chip |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Pin control |
on-chip |
ESP32 pin controller1 |
|
PWM |
on-chip |
ESP32 LED Control (LEDC)1 |
|
on-chip |
ESP32 Motor Control Pulse Width Modulator (MCPWM)2 |
||
RNG |
on-chip |
ESP32 TRNG (True Random Number Generator)1 |
|
SDHC |
on-chip |
ESP32 SDHC controller1 |
|
on-chip |
ESP32 SDHC controller slot2 |
||
Sensors |
on-chip |
ESP32 temperature sensor1 |
|
on-chip |
ESP32 Pulse Counter (PCNT)1 |
||
Serial controller |
on-chip |
||
on-chip |
ESP32 UART1 |
||
SPI |
on-chip |
||
SRAM |
on-chip |
Generic on-chip SRAM description2 |
|
Video |
on-chip |
ESP32 LCD CAM Peripheral interface1 |
|
Watchdog |
on-chip |
ESP32 XT Watchdog Timer1 |
|
on-chip |
|||
Wi-Fi |
on-chip |
ESP32 SoC Wi-Fi1 |
Connections and IOs
Pinout (Credit: Chengdu HelTec Automation Technology Co., Ltd.)
Header |
Function |
Description |
|---|---|---|
J2.1 |
Ve |
|
J2.2 |
GND |
|
J2.3 |
||
J2.4 |
U0RXD |
Zephyr Console+Shell |
J2.5 |
U0TXD |
Zephyr Console+Shell |
J2.6 |
||
J2.7 |
||
J2.8 |
GPIO35 |
PWM LED Control |
J2.9 |
GPIO36 |
Vext Control |
J2.10 |
GPIO37 |
ADC Control |
J2.11 |
||
J2.12 |
GPIO39 |
|
J2.13 |
GPIO40 |
|
J2.14 |
GPIO41 |
|
J2.15 |
GPIO42 |
|
J2.16 |
GPIO45 |
|
J2.17 |
GPIO46 |
|
J2.18 |
ADC1_CH0 |
Battery Voltage Measurement |
J2.19 |
||
J2.20 |
||
J3.1 |
5V |
|
J3.2 |
3V3 |
|
J3.3 |
GND |
|
J3.4 |
GPIO47 |
|
J3.5 |
GPIO48 |
|
J3.6 |
GPIO0 |
User Switch |
J3.7 |
||
J3.8 |
||
J3.9 |
U1RXD |
UART 1 |
J3.10 |
GPIO21 |
|
J3.11 |
||
J3.12 |
U1TXD |
UART 1 |
J3.13 |
||
J3.14 |
NC |
Reset Switch |
J3.15 |
||
J3.16 |
||
J3.17 |
||
J3.18 |
||
J3.19 |
TWAI_TX |
CAN (optional) |
J3.20 |
TWAI_RX |
CAN (optional) |
System requirements
Prerequisites
Espressif HAL requires WiFi and Bluetooth binary blobs in order work. Run the command below to retrieve those files.
west blobs fetch hal_espressif
Note
It is recommended running the command above after west update.
Programming and Debugging
Simple boot
The board could be loaded using the single binary image, without 2nd stage bootloader. It is the default option when building the application without additional configuration.
Note
Simple boot does not provide any security features nor OTA updates.
MCUboot bootloader
User may choose to use MCUboot bootloader instead. In that case the bootloader must be built (and flashed) at least once.
There are two options to be used when building an application:
Sysbuild
Manual build
Note
User can select the MCUboot bootloader by adding the following line to the board default configuration file.
CONFIG_BOOTLOADER_MCUBOOT=y
Sysbuild
The sysbuild makes possible to build and flash all necessary images needed to bootstrap the board with the EPS32-S3 SoC.
To build the sample application using sysbuild use the command:
west build -b heltec_wireless_stick_lite_v3 --sysbuild samples/hello_world
By default, the ESP32S3 sysbuild creates bootloader (MCUboot) and application images. But it can be configured to create other kind of images.
Build directory structure created by sysbuild is different from traditional Zephyr build. Output is structured by the domain subdirectories:
build/
├── hello_world
│ └── zephyr
│ ├── zephyr.elf
│ └── zephyr.bin
├── mcuboot
│ └── zephyr
│ ├── zephyr.elf
│ └── zephyr.bin
└── domains.yaml
Note
With --sysbuild option the bootloader will be re-build and re-flash
every time the pristine build is used.
For more information about the system build please read the Sysbuild (System build) documentation.
Manual build
During the development cycle, it is intended to build & flash as quickly possible. For that reason, images can be built one at a time using traditional build.
The instructions following are relevant for both manual build and sysbuild. The only difference is the structure of the build directory.
Note
Remember that bootloader (MCUboot) needs to be flash at least once.
Build and flash applications as usual (see Building an Application and Run an Application for more details).
# From the root of the zephyr repository
west build -b heltec_wireless_stick_lite_v3/esp32s3/procpu samples/hello_world
The usual flash target will work with the heltec_wireless_stick_lite_v3 board
configuration. Here is an example for the Hello World
application.
# From the root of the zephyr repository
west build -b heltec_wireless_stick_lite_v3/esp32s3/procpu samples/hello_world
west flash
Open the serial monitor using the following command:
west espressif monitor
After the board has automatically reset and booted, you should see the following message in the monitor:
***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx *****
Hello World! heltec_wireless_stick_lite_v3
Debugging
As with much custom hardware, the ESP32S3 modules require patches to OpenOCD that are not upstreamed yet. Espressif maintains their own fork of the project. The custom OpenOCD can be obtained at OpenOCD ESP32.
The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the
-DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>
parameter when building.
Here is an example for building the Hello World application.
# From the root of the zephyr repository
west build -b heltec_wireless_stick_lite_v3/esp32s3/procpu samples/hello_world -- -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>
west flash
You can debug an application in the usual way. Here is an example for the Hello World application.
# From the root of the zephyr repository
west build -b heltec_wireless_stick_lite_v3/esp32s3/procpu samples/hello_world
west debug
