MCUXpresso_MIMXRT1021xxxxx/boards/evkmimxrt1020/driver_examples/cache

Overview

The cache example shows how to use memory cache driver.

In this example, many memory (such as SDRAM, etc) and DMA will be used to show the example. Those memory is both accessible for cpu and DMA. For the memory data alignment, cache driver should be used rightly. For cache enabled case, the cache invalidate operation should be done before cpu access the memory. The cache clean opeartion should be done after CPU verify the memory memory and before DMA access the memory.

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

Connect pin: 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

The log below shows the output of the example in the terminal window:

 Cache example start.

 Cache Invalidate success! 

 Cache Clean success! 
 
 Cache example end. 

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.