61 lines
1.9 KiB
Plaintext
61 lines
1.9 KiB
Plaintext
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.
|
|
|
|
Toolchain supported
|
|
===================
|
|
- IAR embedded Workbench 9.30.1
|
|
- Keil MDK 5.37
|
|
- GCC ARM Embedded 10.3.1
|
|
- MCUXpresso 11.6.0
|
|
|
|
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.
|