SDL DCC Example

Table of Contents

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

Introduction

This example demonstrates how to configure the DCC and use it to monitor clocks in the two supported modes (continuous and single-shot modes). It also demonstrates how to receive errors generated by DCC in the MCU and Main domain.

This example displays:

* Initializing the ESM to detect the DCC error event(s)
* Registration of application callback for notification of ESM error events for the MCU ESM instance
* Configuration of one MCU DCC instance to monitor a single clock in continuous mode
* Forcing of an error to create a DCC error event

The following methods can be used as a trigger for the DCC error event:

* Change ratio criterion for stable clocks
* Use Sciclient API to change clock dividers (with ratio criterion stable) to speed up clock
* Use Sciclient API to change clock dividers (with ratio criterion stable) to slow down clock
* Turn off power for the monitored input clock

Use Cases

Use Case	Reference Clock	Description
UC-1	HFOSC0	Configuration of MCU DCC instance in continuous mode and error event is forced
UC-2	HFOSC0	Configuration of MCU DCC instance in single-shot mode and completion with no errors
UC-3	HFOSC0	Configuration of MCU DCC instance in continuous mode and completion with no errors
UC-4	RC OSC	Configuration of MCU DCC instance in single-shot mode and completion with no errors
UC-5	RC OSC	Configuration of DCC instance in continuous mode and error event is forced
UC-6	RC OSC	Configuration of DCC instance in continuous mode and error event is forced
UC-7	HFOSC0	Configuration of DCC instance in continuous mode and error event is forced
UC-8	RC OSC	Configuration of DCC instance in continuous mode and completion with no errors
UC-9	HFOSC0	Configuration of DCC instance in single-shot mode and completion with no errors
UC-10	FICLK	Configuration of DCC instance in single-shot mode and completion with no errors

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Board	am275x-evm
Example folder	examples/sdl/dcc/dcc_app/

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

DCC

Sample Output

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

 DCC Example Test Application
 
DCC_Test_init: Init WKUP ESM complete
 
 
USECASE: 0
Source clock: HFOSC0
Test clock: SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: Enabling DCC and waiting for Error interrupt
SDL DCC EXAMPLE TEST: DCC Generated Error interrupt
SDL DCC EXAMPLE TEST: Indicating clock drift/change
UC-0 Completed Successfully
 
USECASE: 1
Source clock: HFOSC0
Test clock: SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: DCC Generated completion interrupt
SDL DCC EXAMPLE TEST: No Clock Drift was observed
UC-1 Completed Successfully
 
USECASE: 2
Source clock: HFOSC0
Test clock: SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: Enabling DCC and running for some time
UC-2 Completed Successfully
 
USECASE: 3
Source clock: RC OSC
Test clock: SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: DCC Generated completion interrupt
SDL DCC EXAMPLE TEST: No Clock Drift was observed
UC-3 Completed Successfully
 
USECASE: 4
Source clock: RC OSC
Test clock: SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: Enabling DCC and waiting for Error interrupt
SDL DCC EXAMPLE TEST: DCC Generated Error interrupt
SDL DCC EXAMPLE TEST: Indicating clock drift/change
UC-4 Completed Successfully
 
USECASE: 5
Source clock: RC OSC
Test clock: SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: Enabling DCC and waiting for Error interrupt
SDL DCC EXAMPLE TEST: DCC Generated Error interrupt
SDL DCC EXAMPLE TEST: Indicating clock drift/change
UC-5 Completed Successfully
 
USECASE: 6
Source clock: RC OSC
Test clock: SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: Enabling DCC and waiting for Error interrupt
SDL DCC EXAMPLE TEST: DCC Generated Error interrupt
SDL DCC EXAMPLE TEST: Indicating clock drift/change
UC-6 Completed Successfully
 
USECASE: 7
Source clock: HFOSC0
Test clock: MAIN_SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: Enabling DCC and waiting for Error interrupt
SDL DCC EXAMPLE TEST: DCC Generated Error interrupt
SDL DCC EXAMPLE TEST: Indicating clock drift/change
UC-7 Completed Successfully
 
USECASE: 8
Source clock: RC OSC
Test clock: MAIN_SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: Enabling DCC and running for some time
UC-8 Completed Successfully
 
USECASE: 9
Source clock: HFOSC0
Test clock: FICLK
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: DCC Generated completion interrupt
SDL DCC EXAMPLE TEST: No Clock Drift was observed
UC-9 Completed Successfully
 
USECASE: 10
Source clock: FICLK
Test clock: MAIN_SYSCLK0
 
SDL DCC EXAMPLE TEST: Seed values calculation done.
SDL DCC EXAMPLE TEST: DCC Generated completion interrupt
SDL DCC EXAMPLE TEST: No Clock Drift was observed
UC-10 Completed Successfully
 
 All tests have passed.