ESP8266

Readme
 
This C language project demonstrates the ESP826 wifi. This project interfaces the SSD1306 OLED display and ESP8266-01.

 
The following figure shows the interface to the MSPM0.


 
Derived from Texas Instrument code
  • i2c_controller_rw_multibyte_fifo_poll_LP_MSPM0G3507_nortos_ticlang
  • gpio_toggle_output_LP_MSPM0G3507_nortos_ticlang

Hardware Required

  • MSPM0G3507 LaunchPad™ Development Kit (LP-MSPM0G3507)
  • ECE445M Robot board v7.1
  • ESP8266
Pin assignments
  • ESP8266 1 URxD = PB17 = UART2 out of MSPM0, into ESP8266 115200 baud
  • ESP8266 2 GPIO0 = +3.3V for normal operation (ground to flash)
  • ESP8266 3 GPIO2 = PB19 = GPIO, high/float on startup, has internal pullup, can be used for I/O
  • ESP8266 4 GND = Gnd = GND (70mA)
  • ESP8266 5 UTxD = PB18 = UART out of ESP8266, UART2 into MSPM0 115200 baud
  • ESP8266 6 Ch_PD = chip select, 10k resistor to 3.3V
  • ESP8266 7 Reset = PA25 = MSPM0 GPIO output, can issue output low to cause hardware reset
  • ESP8266 8 Vcc = regulated 3.3V supply with at least 70mA
  • I2C SCL: PB2 is the SSD1306 SCL
  • I2C SDA: PB3 is the SSD1306 SDA
  • Input: PA18 is S2 positive logic switch, index 39 in IOMUX PINCM table
  • Input: PB21 is S3 negative logic switch, index 48 in IOMUX PINCM table

The first version of the Motor board (v7) uses UART1 on PA17 and PA18.

LaunchPad Jumpers
  • Remove J16 J17 J18: Disconnects light sensor from the microcontroller PA22 PA27 PA26
  • J4: Connects PA0 to red LED
  • J5: Connects PB22 to blue LED2
  • J6: Connects PB26 to red LED2
  • J7: Connects PB27 to green LED2

Simplified BSD License (FreeBSD License) Copyright © 2026, Jonathan Valvano, All rights reserved.
 
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