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

Parameter	Value
CPU + OS	r5fss0-0 freertos
Toolchain	ti-arm-clang
Boards	am243x-evm, am243x-lp
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!!