Hardware requirements

  • Mini/micro USB cable

  • EVK-MIMXRT1015 board

  • Personal Computer

Board settings

To make this example work, connections needed to be as follows:

FLEXIO_I2C        connected to  LPI2C1

SCL J18-4 –> J18-6 SDA J18-3 –> J18-5

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. Launch the debugger in your IDE to begin running the demo.

Running the demo

You can see the similar message shows following in the terminal if the example runs successfully.

FlexIO I2C interrupt - LPI2C interrupt
Master will send data :
0x00  0x01  0x02  0x03  0x04  0x05  0x06  0x07
0x08  0x09  0x0A  0x0B  0x0C  0x0D  0x0E  0x0F
0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17
0x18  0x19  0x1A  0x1B  0x1C  0x1D  0x1E  0x1F

Slave received data :
0x00  0x01  0x02  0x03  0x04  0x05  0x06  0x07
0x08  0x09  0x0A  0x0B  0x0C  0x0D  0x0E  0x0F
0x10  0x11  0x12  0x13  0x14  0x15  0x16  0x17
0x18  0x19  0x1A  0x1B  0x1C  0x1D  0x1E  0x1F

Known Issue: Only master send data will be printed when running flexspi_nor_debug target in keil. External flash’s speed can not support the rate of I2C transmit because it is affected by performance. Workaround: Set “I2C_BAUDRATE” to no more than 150k.

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 J41.

  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.