mmccard_polling#
Overview#
The MMCCARD Polling project is a demonstration program that uses the SDK software. It reads/writes/erases the MMC card continusly. The purpose of this example is to show how to use MMCCARD driver andshow how to use polling based transfer API in SDK software driver to access MMC card.Note:User can use MMC plus card or emmc(on board IC, but not recommand use emmc socket,due to high speed timing restriction)
Supported Boards#
EVK-MIMXRT595
Hardware requirements
Micro USB cable
EVK-MIMXRT595 REV C1 board
Personal Computer
Board settings
Make sure resistors R691~R697 are removed and resistors R611~R620,R660,R661,R698 are populated.
Prepare the Demo
Connect a micro USB cable between the PC host and the CMSIS DAP USB port (J40) on the board
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Launch the debugger in your IDE to begin running the demo. Please insert the SDCARD into card slot(J32)
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
MMCCARD polling example.
Card user partition size xxxx bytes
Working condition:
Voltage: xxxx
Timing mode: xxxx
Bus width: xxxx
Freq : xxxx
Read/Write the card continuously until encounter error....
Write/read one data block......
Compare the read/write content......
The read/write content is consistent.
Write/read multiple data blocks......
Compare the read/write content......
The read/write content is consistent.
Erase data groups......
Input 'q' to quit read/write/erase process.
Input other char to read/write/erase data blocks again.
MIMXRT700-EVK
Hardware requirements
Micro USB cable
MIMXRT700-EVK
Personal Computer
Board settings
The MMC_SelectBusTiming in mmccard_init will fail, need to be commented out.
Prepare the Demo
Connect a micro USB cable between the PC host and the MCU-LINK USB port on the board
Open a serial terminal with the following settings:
115200 baud rate
8 data bits
No parity
One stop bit
No flow control
Download the program to the target board.
Launch the debugger in your IDE to begin running the demo.
Running the demo
When the demo runs successfully, the log would be seen on the terminal like:
MMCCARD interrupt example.
Card user partition size xxxx bytes
Working condition:
Voltage: xxxx
Timing mode: xxxx
Bus width: xxxx
Freq : xxxx
Read/Write the card continuously until encounter error....
Write/read one data block......
Compare the read/write content......
The read/write content is consistent.
Write/read multiple data blocks......
Compare the read/write content......
The read/write content is consistent.
Erase data groups......
Input 'q' to quit read/write/erase process.
Input other char to read/write/erase data blocks again.