MCUXpresso_MIMXRT1021xxxxx/boards/evkmimxrt1020/demo_apps/bubble_peripheral

Overview

The bubble level demo demonstrates basic usage of the on-board accelerometer to implement a bubble level. A bubble level utilizes two axes to visually show deviation from a level plane (0 degrees) on a given axis.

The following files are generated by MCUXpresso Config Tools:

• bubble_peripheral.mex: This mex file contains pin/clock/peripheral settings of this example. User can modify the settings in config tool and generate new source file for pin/clock/peripheral.
• peripheral.c/.h: These files are generated by MCUXpresso peripherals tool which could be imported back to the tool.
• clock_config.c/.h: These files are generated by MCUXpresso clocks tool which could be imported back to the tool.
• pin_mux.c/.h: These files are generated by MCUXpresso pins tool which could be imported back to the tool.

SDK version

• Version: 2.15.000

Toolchain supported

• IAR embedded Workbench 9.40.1
• Keil MDK 5.38.1
• GCC ARM Embedded 12.2
• MCUXpresso 11.8.0

Hardware requirements

• Mini/micro USB cable
• EVK_MIMXRT1020 board
• Personal Computer

Board settings

No special settings are required.

Prepare the Demo

1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board.
2. Open a serial terminal with the following settings:
   • 115200 baud rate
   • 8 data bits
   • No parity
   • One stop bit
   • No flow control
3. Download the program to the target board.
4. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.

Running the demo

When the example runs successfully, you can see the similar information from the terminal as shown below.

Welcome to the BUBBLE example

You will see the change of LED brightness when change angles of board

x=  6 y = 22
x=  8 y = 26
x= 10 y = 28
x= 10 y = 28
x= 11 y = 29
x= 11 y = 29

Note: if sensor chip(U26) is not welded on the board, the LED will be blinking

Note: To debug in qspiflash, following steps are needed:

1. Select the flash target and compile.
2. Set the SW8: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J23.
3. Start debugging in IDE.
   • Keil: Click "Download (F8)" to program the image to qspiflash first then clicking "Start/Stop Debug Session (Ctrl+F5)" to start debugging.