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Supported Targets ESP32 ESP32-C2 ESP32-C3 ESP32-S2 ESP32-S3

I2C-WIFI Test

Overview

This test demonstrates basic usage of I2C driver with wifi softAP.

I2C MASTER

  1. Switch on wifi softAP, and connect to your personal device, like your mobile phone.
  2. Send data to slave board.

I2C SLAVE

  1. Receive data from master board.

How to use test

Hardware Required

To run this test, you should have at least one ESP development board for master. But to make this test convenient, we also use a ESP development board for slave. (You can change your slave device, but don't forget to change code as well if necessary.)

Pin Assignment

Note: The following pin assignments are used by default, you can change these in the menuconfig .

SDA SCL
ESP32/ESP32-S2 I2C GPIO18 GPIO19
ESP32-S3 I2C GPIO1 GPIO2
ESP32-C3 I2C GPIO5 GPIO9

Note: It is recommended to add external pull-up resistors for SDA/SCL pins to make the communication more stable, though the driver will enable internal pull-up resistors.

Configure the project

Open the project configuration menu (idf.py menuconfig). Then go into Test Configuration menu.

I2C MASTER configuration

  • In the I2C working mode select menu, you can set the working mode of i2c, choose i2c master mode.
  • In the I2C Configuration menu, you can set the pin number of SDA/SCL. Also you can modify the I2C port number and frequency of the master. And you can set the slave address here as well.
  • Enable WIFI AP if you need it.
  • In the WIFI softAP Configuration menu, you can set the wifi information here.

I2C SLAVE configuration

  • In the I2C working mode select menu, you can set the working mode of i2c, choose i2c slave mode.
  • In the I2C Configuration menu, you can set the pin number of SDA/SCL. Also you can modify the I2C port number and address of the slave.

Build and Flash

Enter idf.py -p PORT flash monitor to build, flash and monitor the project.

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Test Output

MASTER

I (339) cpu_start: Starting scheduler.
I (359) I2C-wifi test: ESP_WIFI_MODE_AP
I (359) pp: pp rom version: 9387209
I (359) net80211: net80211 rom version: 9387209
I (369) wifi:wifi driver task: 3fc9def0, prio:23, stack:6656, core=0
I (369) system_api: Base MAC address is not set
I (379) system_api: read default base MAC address from EFUSE
I (379) wifi:wifi firmware version: d062fdb
I (389) wifi:wifi certification version: v7.0
I (389) wifi:config NVS flash: enabled
I (389) wifi:config nano formating: disabled
I (399) wifi:Init data frame dynamic rx buffer num: 32
I (399) wifi:Init management frame dynamic rx buffer num: 32
I (409) wifi:Init management short buffer num: 32
I (409) wifi:Init dynamic tx buffer num: 32
I (419) wifi:Init static tx FG buffer num: 2
I (419) wifi:Init static rx buffer size: 1600
I (419) wifi:Init static rx buffer num: 10
I (429) wifi:Init dynamic rx buffer num: 32
I (429) wifi_init: rx ba win: 6
I (439) wifi_init: tcpip mbox: 32
I (439) wifi_init: udp mbox: 6
I (439) wifi_init: tcp mbox: 6
I (449) wifi_init: tcp tx win: 5744
I (449) wifi_init: tcp rx win: 5744
I (459) wifi_init: tcp mss: 1440
I (459) wifi_init: WiFi IRAM OP enabled
I (459) wifi_init: WiFi RX IRAM OP enabled
I (469) phy_init: phy_version 500,985899c,Apr 19 2021,16:05:08
I (589) wifi:set rx active PTI: 0, rx ack PTI: 0, and default PTI: 0
I (599) wifi:mode : softAP (7c:df:a1:86:d8:a9)
I (599) wifi:Total power save buffer number: 16
I (599) wifi:Init max length of beacon: 752/752
I (599) wifi:Init max length of beacon: 752/752
I (609) I2C-wifi test: wifi_init_softap finished. SSID:myssid password:mypassword channel:1

SLAVE

I (277) cpu_start: Starting scheduler.
the clk config is 0, speed is 0
slave mode.read thread start...
I (23609) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23619) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23629) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23639) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23649) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23659) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23669) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23679) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23689) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23699) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23709) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23719) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23729) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23739) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23749) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23759) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23769) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23779) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23789) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23799) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23809) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23819) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23829) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23839) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23849) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23859) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23869) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23879) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23889) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23899) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23909) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23919) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23929) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23939) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23949) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23959) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23969) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23979) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23989) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (23999) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24009) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24019) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24029) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24039) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24049) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24059) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24069) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24079) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24089) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24099) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24109) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27 
I (24119) I2C-wifi test: 6a 1b 05 1f 1f 08 01 20 19 03 27