Hardware requirements

  • Micro USB cable

  • MIMX8ULP-EVK/EVK9 board

  • J-Link Debug Probe

  • 5V power supply

  • Personal Computer

Board settings

No special settings are required.

Please note this application can’t support running with Linux BSP!

Please note this application can only run well with RAM link file! If run it in QSPI flash in place, there’s high latency when instruction fetch cache miss. The FlexIO I2C has critical timing requirement that I2C data must be read/write in time, otherwise the state machine works abnormally.

Prepare the Demo

  1. Connect 5V power supply and J-Link Debug Probe to the board, switch SW10 to power on the board.

  2. Connect a micro USB cable between the host PC and the J17 USB port on the target board.

  3. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  4. Download the program to the target board.

  5. Either press the reset button on your board or launch the debugger in your IDE to begin running the example

Running the demo

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

FlexIO I2C example read accelerometer value
Found a LSDM6DSO on board, the device address is 0x6A.
The accel values:
status_reg = 0x5 , x = -28924 , y =  5127 , z = 24640
status_reg = 0x5 , x = 31748 , y =  9991 , z = 27456
status_reg = 0x5 , x = 28164 , y = 14599 , z = 15680
status_reg = 0x5 , x = 24068 , y = 21767 , z = 31808
status_reg = 0x5 , x = 13828 , y = -32505 , z = 22848
status_reg = 0x5 , x = 10500 , y = -26105 , z = 16192
status_reg = 0x5 , x =  6916 , y = -26105 , z = 17472
status_reg = 0x5 , x =  8452 , y = -25081 , z = 21056
status_reg = 0x5 , x =  8964 , y = -26105 , z = 22080
status_reg = 0x5 , x =  7940 , y = -24569 , z = 20800

End of I2C example .