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The ESP8266 WiFi driver for mbed-os

The mbed OS driver for the ESP8266 WiFi module

Firmware version

ESP8266 modules come in different shapes and forms, but most important difference is which firmware version it is programmed with. To make sure that your module has mbed-os compatible firmware follow update guide: https://developer.mbed.org/teams/ESP8266/wiki/Firmware-Update

Testing

The ESP8266 library contains the core network tests taken from mbed OS. To run the tests you will need mbed CLI and mbed OS.

First, setup the the esp8266-driver and mbed-os repositories for testing:

# Sets up the ESP8266 for testing
mbed import esp8266-driver
cd esp8266-driver
mbed add mbed-os

Now you should be able to run the network tests with mbed test:

# Runs the ESP8266 network tests, requires a wifi access point
mbed test -t <COMPILER HERE> -m <BOARD HERE> -n tests-net* --compile -DMBED_CFG_ESP8266_SSID=<SSID HERE> -DMBED_CFG_ESP8266_PASS=<PASS HERE>
mbed test -t <COMPILER HERE> -m <BOARD HERE> -n tests-net* --run --verbose

There are a couple other options that can be used during testing:

  • MBED_CFG_ESP8266_SSID - SSID of the wifi access point to connect to
  • MBED_CFG_ESP8266_SSID - Passphrase of the wifi access point to connect to
  • MBED_CFG_ESP8266_TX - TX pin for the ESP8266 serial connection (defaults to D1)
  • MBED_CFG_ESP8266_RX - TX pin for the ESP8266 serial connection (defaults to D0)
  • MBED_CFG_ESP8266_DEBUG - Enabled debug output from the ESP8266

For example, here is how to enabled the debug output from the ESP8266:

# Run the ESP8266 network tests with debug output, requires a wifi access point
mbed test -t <COMPILER HERE> -m <BOARD HERE> -n tests-net* --compile -DMBED_CFG_ESP8266_SSID=<SSID HERE> -DMBED_CFG_ESP8266_PASS=<PASS HERE> -DMBED_CFG_ESP8266_DEBUG=true
mbed test -t <COMPILER HERE> -m <BOARD HERE> -n tests-net* --run --verbose