IPC RP Message Echo

Table of Contents

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

Introduction

This example shows usage of RP Message APIs to each multi-byte messages between different CPUs

In this example,

• One "main" CPU, sends multi-byte messages to other "remote" CPUs using the RP Message APIs
• The "remote" CPUs, then echo back the same message to the main CPUs
• Once all messages are echoed the main CPU exits. The remote CPUs remain waiting to receive new messages.

Supported Combinations

Steps to Run the Example

Note

This is a system or multi-core project, so refer to system project build instructions for CCS project or makefiles when building the example.

• When using CCS projects to build, import the system CCS project and build it using the CCS project menu (see Using SDK with CCS Projects). This will build all the dependant CPU projects as well
• When using makefiles to build, build the system makefile using make command (see Using SDK with Makefiles). This will build all the dependant CPU makefiles as well.
• Launch a CCS debug session and run the executables, see CCS Launch, Load and Run
• This is a multi-core example. Hence the executables should be loaded and run for all the above mentioned cores
• The application has a sync mechanism at the start which waits for all cores to start before doing the test. Hence the cores can be loaded and run in any sequence.

See Also

IPC RPMessage

Sample Output

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

[r5f0-1]     1.019992s : [IPC RPMSG ECHO] Remote Core waiting for messages from main core ... !!!
[r5f1-0]     0.512016s : [IPC RPMSG ECHO] Remote Core waiting for messages from main core ... !!!
[r5f1-1]     0.000055s : [IPC RPMSG ECHO] Remote Core waiting for messages from main core ... !!!
[IPC RPMSG ECHO] Message exchange started by main core !!!
[IPC RPMSG ECHO] All echoed messages received by main core from 3 remote cores !!!
[IPC RPMSG ECHO] Messages sent to each core = 100000
[IPC RPMSG ECHO] Number of remote cores = 3
[IPC RPMSG ECHO] Total execution time = 4203377 usecs
[IPC RPMSG ECHO] One way message latency = 7005 nsec
All tests have passed!!