MCSPI Loopback DMA

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This example demonstrates the McSPI RX and TX operation configured in blocking, DMA mode of operation.

This example sends a known data in the TX mode of length APP_MCSPI_MSGSIZE and then receives the same in RX mode. Internal pad level loopback mode is enabled to receive data. To enable internal pad level loopback mode, D0 pin is configured to both TX Enable as well as RX input pin in the SYSCFG.

When transfer is completed, TX and RX buffer data are compared. If data is matched, test result is passed otherwise failed.

Supported Combinations

Parameter	Value
CPU + OS	a53ss0-0 freertos
Toolchain	arm.gnu.aarch64-none
Boards	am62x-sk, am62x-sk-lp, am62x-sip-sk
Example folder	examples/drivers/mcspi/mcspi_loopback_dma

Steps to Run the Example

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles)
• Launch a CCS debug session and run the executable, see CCS Launch, Load and Run

See Also

MCSPI

Sample Output

Shown below is a sample output when the application is run,

[MCSPI] Loopback example DMA mode started ...
----------------------------------------------------------
McSPI Clock 1000000 Hz
----------------------------------------------------------
Data Width      Data Length     Transfer Time (micro sec)
8               128             1132.80
----------------------------------------------------------
 
All tests have passed!!