Introduction

This example performs EDMA transfer test using chain mode.

In chain transfer mode completion of one transfer automatically sets the event for another channel.
The PaRAM set is initialized with two channels and provides a synchronization event (or trigger) to the chained DMA channel, as soon as the transfer (final or intermediate) completes on the main DMA/QDMA channel.This example uses AB Synchronized transfer mode.
The source memory is initialized with sample data and destination memory is initialized with zeroes for validation. Cache write back is done to ensure that initialized data from cache is written to memory.
When a chained completion code is detected, the value of which is dictated by the transfer completion code of the PaRAM set associated with the channel, Intermediate and final transfer interrupts are enabled and the transfer completion interrupt status is polled to be set before giving next trigger.
After the transfer is completed, cache is invalidated to update cache with the transferred data. Data validation is performed by comparing source and destination memory. If the equality test is successful, the test was successful.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am263x-cc, am263x-lp
Example folder	examples/drivers/edma/edma_chain_transfer/

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

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

[EDMA] Chain Transfer Test Started...
[EDMA] Chain Transfer Test Completed!!
All tests have passed!!