UDMA SW Trigger

Table of Contents

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

Introduction

UDMA SW trigger sample application performs 3D transfer using SW trigger method as below Loop N times (icnt2)

• SW trigger CH 0 -> Triggers MSMC to Intermediate buffer
• Wait for CH 0 icnt0 x icnt1 to complete
• SW trigger Channel 1 -> Triggers Intermediate buffer to MSMC
• Wait for CH 1 icnt0 x icnt1 to complete

Each loop transfers M (icnt0 x icnt1) bytes of data. MSMC size is M x N and intermediate buffer size is just M bytes. Intermediate buffer memory set to wrap around after M bytes of transfer.

Where,

• M is icnt0 x icnt1 (UDMA_TEST_1D_SIZE x UDMA_TEST_2D_SIZE)
• N is icnt2 = UDMA_TEST_3D_SIZE

Once the transfer it completes, it does cache operation for data coherency and compares the source and destination buffers for any data mismatch.

Supported Combinations

Attention

A53 NORTOS, A53 FREERTOS and A53 FREERTOS SMP support is experimental and is NOT supported by TI.

Parameter	Value
CPU + OS	r5fss0-0 freertos
	a53ss0-0 nortos
	a53ss0-0 freertos
	a53ss0-0 freertos-smp
Toolchain	ti-arm-clang
	arm.gnu.aarch64-none
Board	am64x-evm
Example folder	examples/drivers/udma/udma_sw_trigger

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

UDMA

Sample Output

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

[UDMA] SW Trigger application started ...
All tests have passed!!