Tiny Coin Ticker

Hardware Setup

Using an ESP32 module Heltec WiFi Kit 32

Install the drivers to recognize the serial port connection to the board.

After installing and connecting the board the serial port should be listed:

> ls /dev/tty.*

...
/dev/tty.SLAB_USBtoUART

Software Setup

Platformio is the main development platform.

Create a new conda environment:

> conda create -n arduino python=3.7
> conda activate arduino

Install Platformio:

> conda install -c conda-forge platformio

Find the ESP32 board:

> platformio boards | egrep -i heltec

Initialize the directory structure for our board:

> pio project init --board heltec_wifi_kit_32

Build

Clean, build and upload main.cpp:

> pio run -t clean
> pio run -e heltec_wifi_kit_32 -t upload

Monitor the serial port at 9600/8-N-1:

> pio device monitor

> screen /dev/tty.SLAB_USBtoUART 9600 cs8 -parenb cstopb
> minicom -D /dev/tty.SLAB_USBtoUART -b 9600

Tests

> pio test -e heltec_wifi_kit_32 --verbose

Collected 1 items

Processing * in heltec_wifi_kit_32 environment
----------------------------------------------
Building...
CONFIGURATION: https://docs.platformio.org/page/boards/espressif32/heltec_wifi_kit_32.html
PLATFORM: Espressif 32 (2.1.0) > Heltec WiFi Kit 32
HARDWARE: ESP32 240MHz, 320KB RAM, 4MB Flash
DEBUG: Current (esp-prog) External
PACKAGES:
 - framework-arduinoespressif32 3.10004.201016 (1.0.4)
 - tool-esptoolpy 1.30000.201119 (3.0.0)
 - toolchain-xtensa32 2.50200.80 (5.2.0)
LDF: Library Dependency Finder -> http://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
Found 27 compatible libraries
Scanning dependencies...
Dependency Graph
|-- <Heltec ESP32 Dev-Boards> 1.1.0+sha.62228d5
|   |-- <SPI> 1.0
|   |-- <Wire> 1.0.1
Building in release mode
...
CURRENT: upload_protocol = esptool
MethodWrapper(["upload"], [".pio/build/heltec_wifi_kit_32/firmware.bin"])
Auto-detected: /dev/cu.SLAB_USBtoUART
...
esptool.py v3.0
Serial port /dev/cu.SLAB_USBtoUART
Connecting........____
Chip is ESP32-D0WDQ6 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 26MHz
MAC: b4:e6:2d:8a:10:e9
Uploading stub...
...
Writing at 0x00028000... (100 %)
Wrote 219152 bytes (110887 compressed) at 0x00010000 in 2.6 seconds (effective 670.5 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...
Testing...
If you don't see any output for the first 10 secs, please reset board (press reset button)

test/test_main.cpp:32:test_led_builtin_pin_number   [PASSED]
test/test_main.cpp:42:test_led_state_high   [PASSED]
test/test_main.cpp:44:test_led_state_low    [PASSED]
test/test_main.cpp:42:test_led_state_high   [PASSED]
test/test_main.cpp:44:test_led_state_low    [PASSED]
test/test_main.cpp:42:test_led_state_high   [PASSED]
test/test_main.cpp:44:test_led_state_low    [PASSED]
test/test_main.cpp:42:test_led_state_high   [PASSED]
test/test_main.cpp:44:test_led_state_low    [PASSED]
test/test_main.cpp:42:test_led_state_high   [PASSED]
test/test_main.cpp:44:test_led_state_low    [PASSED]
-----------------------
11 Tests 0 Failures 0 Ignored
==== [PASSED] Took 25.32 seconds ====

Test    Environment         Status    Duration
------  ------------------  --------  ------------
*       heltec_wifi_kit_32  PASSED    00:00:25.325
==== 1 succeeded in 00:00:25.325 ====

Other

> ls -alt ~/.platformio/packages/
> ls ~/.platformio/packages/framework-arduinoespressif32/libraries/WiFi/src/WiFiType.h
> ls ~/.platformio/packages/framework-espidf/components/esp_wifi/include/esp_wifi_types.h