EV-COG-AD3029LZ [ADI]
LFCSP MCU COG BOARD DEV KIT;
| 型号： | EV-COG-AD3029LZ |
| 厂家： | 
ADI |
| 描述： | LFCSP MCU COG BOARD DEV KIT |
| 文件： | 总13页 (文件大小：1262K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EV-COG-AD3029LZ User Guide
UG-1205
One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
How to Reproduce the ADuCM3027/ADuCM3029 EEMBC Scores on the
EV-COG-AD3029LZ
EVALUATION KIT CONTENTS
GENERAL DESCRIPTION
This user guide describes how to reproduce the Embedded
Microprocessor Benchmark Consortium (EEMBC®) ULPBench™
Core Profile score and the CoreMark® score for the ADuCM3027/
ADuCM3029 microcontrollers.
This user guide describes the steps necessary to install the
software and to set up the all of the hardware for measuring
both scores.
This user guide details the energy consumed by the ADuCM3027/
ADuCM3029 microcontroller in the different power modes used
on the benchmark, which confirms the ADuCM3027/
ADuCM3029 data sheet power specifications.
EV-COG-AD3029LZ
EV-GEAR-EXPANDER1Z
HARDWARE REQUIRED
EEMBC ULPBench EnergyMonitor hardware
SOFTWARE REQUIRED
EEMBC ULPBench EnergyMonitor software
IAR Embedded Workbench
Any serial monitor (PuTTY is used in this example)
The ADuCM3027/ADuCM3029 is an ultra low power, integrated,
mixed-signal microcontroller system used for processing, control,
and connectivity. The microcontroller unit (MCU) subsystem is
based on the Arm® Cortex®-M3 processor, a collection of digital
peripherals, cache embedded SRAM and flash memory, and an
analog subsystem that provides clocking, reset, and power manage-
ment capabilities, along with the analog-to-digital converter
(ADC).
The ADuCM3027/ADuCM3029 processor provides a collection
of power modes and features, for example, dynamic and software
controlled clock gating and power gating, to support extremely
low dynamic power management and hibernate power manage-
ment.
This user guide must be used in conjunction the ADuCM3027/
ADuCM3029 data sheet when using the EV-COG-AD3029LZ
evaluation board.
Figure 1. EEMBC ULPBench Score Window
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TABLE OF CONTENTS
Evaluation Kit Contents................................................................... 1
CoreMark............................................................................................7
Loading the CoreMark Project....................................................7
Running the Application..............................................................7
CoreMark Results..........................................................................8
Power Measurements................................................................. 10
ULPBench Core Profile ................................................................. 11
The EnergyMonitor ................................................................... 11
Building the Application Code................................................. 11
Running the Benchmark ........................................................... 12
Results Analysis.......................................................................... 13
Hardware Required .......................................................................... 1
Software Required ............................................................................ 1
General Description......................................................................... 1
Revision History ............................................................................... 2
About the EEMBC............................................................................ 3
About CoreMark........................................................................... 3
About ULPBench.......................................................................... 3
IAR Setup........................................................................................... 4
IAR Tools Installation .................................................................. 4
IAR Project Configuration.......................................................... 4
REVISION HISTORY
4/2018—Revision 0: Initial Version
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UG-1205
ABOUT THE EEMBC
The EEMBC is a nonprofit industry association that detected the
need for a joint democratic effort involving the leading suppliers
in the embedded industry to make new benchmarks a reality.
CoreMark is a benchmark that aims to measure the performance
of central processing units (CPUs) used in embedded systems.
This benchmark was developed in 2009 at the EEMBC and is
intended to become an industry standard, replacing the
antiquated Dhrystone benchmark. Written in C, the code
contains implementations of the following algorithms:
The members of the EEMBC represent more than 40 of the
leading semiconductor, intellectual property, compiler, RTOS,
and system companies in the world. Furthermore, the EEMBC
is licensed by more than 80 companies and more than 100
universities worldwide. Through the combined efforts of its
members, EEMBC benchmarks have become an industry
standard for evaluating the capabilities of embedded processors
and systems according to objective, clearly defined, application-
based criteria.
•
•
•
List processing (find and sort)
Matrix manipulation (common matrix operations)
State machine (determine if an input stream contains valid
numbers)
•
Cyclic redundancy check (CRC)
ABOUT ULPBench
The EEMBC has benchmark suites targeting cloud and big data,
mobiles devices (for phones and tablets), networking, ultra low
power microcontrollers, the Internet of Things (IoT), digital
media, automotive, and other application areas. The EEMBC
also has benchmarks for general-purpose performance analysis,
including CoreMark, MultiBench™ (multicore), and FPMark™
(floating point).
Whether the target is edge nodes for the IoT or any other type
of battery-powered application, the implications of ultra low power
(ULP) varies. The lowest active current is required when the power
source is severely limited (for example, energy harvesting). The
lowest sleep current is required when the system spends most of
its time in standby or sleep mode, waking up infrequently (perio-
dically or asynchronously) to process a task. ULP can also imply
great energy efficiency, where the most work is performed in a
limited time period. Overall, the application requires a combi-
nation of tradeoffs on all of the previously mentioned criteria.
This user guide focuses on the CoreMark and ultra low power
microcontroller benchmarks, targeted to measure the power
processing and the MCU energy efficiency, respectively, because
these aspects are key features of the ADuCM3027/ADuCM3029
processor.
To ensure ULP operation over periods of months, years, and
decades, application developers face a number of optimization
challenges. There are an increasing number of microcontrollers
claiming ULP capabilities; however, developers cannot rely on data
sheet parameters alone. The EEMBC ULPBench is standardized on
data sheet parameters and provides a methodology to reliably
and equitably measure MCU energy efficiency.
ABOUT CoreMark
To select an MCU for a particular application, the user must
know if the MCU has enough processing power to meet the
requirement. Several benchmarking options are available.
Dhrystone is the most widely used benchmarking option;
however, it has a few inherent problems, for example, having
library calls within the timed portion, and being susceptible to
the ability of a compiler to optimize work. To address these
problems and to provide a simple, open source benchmark,
EEMBC created the CoreMark.
The foundations of ULPBench are as follows:
•
•
•
Comparability, to simplify the comparison of devices.
Transparency, for measurement and the setup processes.
Reproducibility, to simplify reproduction of the benchmark
scores.
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IAR SETUP
IAR TOOLS INSTALLATION
The IAR Embedded Workbench® and the included IAR C/C++
Compiler™ generates fast performing, compact code for Arm®-
based applications. Analog Devices, Inc., provides the board
support package for the ADuCM3027/ADuCM3029 for the IAR
Embedded Workbench.
Support for the ADuCM3027/ADuCM3029 is provided within
the board support package.
The Kickstart edition is a special starter kit/evaluation version
of IAR that is free. This edition has limitations both in code size
(32 kB) and in the service and support provided.
The IAR Embedded Workbench can be downloaded from the
IAR website.
IAR PROJECT CONFIGURATION
Figure 3. General Options—Target Tab
This section describes the IAR configuration for proper
operation. Only the settings that must be modified from the
default values are mentioned.
3. From the C/C++ Compiler menu, in the Optimizations
tab, select High in the Level pane to ensure that the
optimization for high speed is chosen (see Figure 4). Some
functions, such as pltInitialize, are protected to ensure that
they are not optimized. The following code protects a
function and prevents the compiler from modifying the
function code:
1. Right-click the name of the project and click Options…, as
shown in Figure 2.
#pragma optimize=none
Figure 2. Project Options
2. From the General Options menu, in the Target tab, ensure
that AnalogDevices ADUCM3027 or AnalogDevices
ADUCM3029 is selected as the target in the Processor
variant pane, depending on the microcontroller used
(Figure 3).
Figure 4. C/C++ Compiler—Optimizations Tab
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Figure 5 shows the included directories path and the
Defined symbols: (one per line) pane settings necessary
for a proper compilation of the ULPBench Core Profile
project.
4. A 32-bit CRC checksum stored in the Signature field
enables user code to request an integrity check of the user
space. The user can configure the checksum as shown in
Figure 7 and Figure 8 (both configurations can be found in
the Linker menu).
Figure 5. C/C++ Compiler Menu—Preprocessor ULPBench Configuration
Figure 6 shows the included directories path and the
Defined symbols: (one per line) necessary for a proper
compilation of the CoreMark project.
Figure 7. Linker Menu—Checksum Tab
Figure 8. Linker Menu—Extra Options Tab
Figure 6. C/C++ Compiler Menu—Preprocessor CoreMark Configuration
To avoid undesired warnings, add the diagnostics Pa050
and Pa082 to the Suppress following diagnostics option
in the Diagnostics tab of the C/C++ Compiler menu.
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5. The debugger used is CMSIS DAP, selected from the
dropdown list in the Driver pane of the Debugger menu
(see Figure 9).
7. Figure 11 and Figure 12 show the CMSIS DAP menu
configuration. From the dropdown list in the Reset pane,
select Hardware for the target reset strategy.
Figure 11. CMSIS DAP—Setup Tab
Figure 9. Debugger Menu—Setup Tab
In the Interface tab, in the Interface pane, ensure that the SWD
6. Ensure that the Verify download and Use flash loader(s)
checkboxes are selected in the Debugger menu in the
Download tab, as shown in Figure 10.
option is selected (see Figure 12).
Figure 12. CMSIS DAP Menu—Interface Tab
Figure 10. Debugger Menu—Download Tab
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CoreMark
EEMBC does not restrict on changing the core_portme.c and
core_portme.h files to suit the Analog Devices platform.
LOADING THE CoreMark PROJECT
The project with the CoreMark source files, core_portme.c files,
and core_portme.h files are tuned to the Analog Devices platform.
The following describes attributes of the core_portme.c file that
are not included in the file given by the EEMBC:
To add the CoreMark project on IAR, take the following steps:
Code for universal asynchronous receiver/transmitter
(UART) printing.
Code for calculating the ticks of execution using an
oscillator or crystal.
Code to configure the microcontroller properly.
Header files to support these codes.
1. Open the IAR Embedded Workbench.
2. Open the project in the IAR software.
3. From the Project menu, click Add Existing Project…
from the dropdown list, as shown in Figure 13.
Device configuration. Note that the high power buck is enabled
to reduce the power consumption, which is useful during power
measurement when CoreMark is running (see the Power
Measurements section).
The core_portme.h file has two defines:
The UART_PRINT define is used to print the result
through the UART. If this is commented, the results are
printed only on the terminal input/output.
The XTAL define is used to decide whether measuring the
ticks using an external crystal oscillator or the internal
resistor-capacitor (RC) oscillator. If this is commented, the
internal oscillator is used; otherwise, the crystal oscillator
is used.
Figure 13. Adding Existing Project
4. Browse through the obtained project and open the .ewp
extension file. The files available in the workspace are
shown in Figure 14.
RUNNING THE APPLICATION
Building the Application
To build or compile the application code, take one of the
following steps:
Click Project, and then click Rebuild All (as shown in
Figure 15).
Figure 14. Project Files
The BSP sources folder includes the board support package
files to properly configure the device. The CoreMark sources
folder includes the source files given by the EEMBC. The
Platform sources folder contains the core_portme.c file given
by the EEMBC; however, the file is tuned to configure the
ADuCM3027/ADuCM3029 processor.
Figure 15. Build the Project
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Right-click the project name and click Rebuild All, as
shown in Figure 16. The user is prompted to save the
workspace in a .eww extension. The project must build
without any errors.
Figure 18. Download and Debug Button
Running the Project
To run the code, click Go, as shown in Figure 19.
Figure 19. Running the Project
COREMARK RESULTS
The CoreMark code must run for at least 10 seconds. The provided
code has set up 10,000 iterations, which requires approximately
2 minutes to complete the execution.
The results are printed on the terminal input/output. To view
the terminal input/output, click View, then click Terminal I/O
from the dropdown list (see Figure 20). It is necessary to be in
debug mode for this option to be active.
Figure 16. Building the Project
Downloading the Code
To load the code onto the EV-COG-AD3029LZ board, take one
of the following steps:
Click Project, Download, and then Download active
application, as shown in Figure 17.
Click Download and Debug, as shown in Figure 18.
Figure 20. Viewing the Terminal I/O
Figure 17. Downloading the Code
Figure 21. Terminal Results
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By default, the UART_PRINT define in the core_portme.h file
is commented.
Rebuild the project and follow the instructions in the Running
the Project section. The results are printed through the UART
(see Figure 24).
To print the results through the UART, take the following steps:
The CoreMark number shows the raw horsepower, and the
CoreMark/MHz number shows the efficiency of the core. To
calculate the CoreMark/MHz number, the CoreMark number
must be divided by the clock speed used when the benchmark is
performed.
1. Uncomment the UART_PRINT define.
2. Connect the UART port of the EV-COG-AD3029LZ to the
PC using a USB cable.
3. Ensure that the UART Jumpers (1, 2, 7, and 8) of the
P8 connector are connected (see Figure 22).
CoreMark Score
CoreMark / MHz
Clock Frequency
In this project, the ADuCM3027/ADuCM3029 processors runs
at 26 MHz.
85.337589
26 MHz
CoreMark/MHz
The CoreMark/MHz score is 3.2822.
This score is almost equal to the CoreMark/MHz score of the
Arm® Cortex®-M3 processor, whose score is 3.32.
Figure 22. Jumper Connections for UART Printing
4. From the Control Panel, click Device Manager.
5. Check the COM port number to which the UART is
connected.
6. Open a terminal that can connect to the UART port (the
PuTTY terminal is used here).
To report the score, CoreMark recommends the following format:
CoreMark/MHz 1.0: 3.2822 / IAR EWARM
7.50.2.10505 --no_size_constraints
--cpu=Cortex-M3 -D __ADUCM3029__
--no_code_motion -Ohs -e --fpu=None
--endian=little/FLASH
7. Set the connection type to serial, and enter the
corresponding COM port number.
8. The other settings are as shown in Figure 23.
Figure 23. UART Configuration
Figure 24. Results on UART
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6. For dynamic current consumption, repeat this procedure
with a different frequency. Change the CLKDIV definition
variable to 4 to divide the frequency by 4, which yields a
value of 26 MHz/4 = 6.5 MHz.
7. Monitor the current consumption on the meter. The
current consumption must be approximately 425 µA.
POWER MEASUREMENTS
To monitor the current consumption of the ADuCM3027/
ADuCM3029 processor when it executes the CoreMark code,
take the following steps:
1. Ensure that the UART_PRINT define in the core_portme.h
file is commented so that the UART pins are not floating.
2. Load the code onto the microcontroller.
3. Remove the P8 jumpers.
To obtain the dynamic current consumption value, calculate the
slope of the line formed by the two points (frequency and
current).
4. Press the Reset button.
5. Monitor the current consumption through the TH2
jumper on the meter. The current consumption must be
approximately 1165 µA when the processor executes the
code at 26 MHz.
The slope is calculated as follows:
1165 − 425
Slope =
= 38 µA/MHz
26 − 6.5
The dynamic current consumption is 38 µA/MHz.
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ULPBench CORE PROFILE
THE EnergyMonitor
BUILDING THE APPLICATION CODE
The EEMBC ULPBench EnergyMonitor software is an accurate
tool for measuring energy. The EEMBC EnergyMonitor hardware
(shown in Figure 25) is needed to measure ULPBench scores.
This hardware can be purchased from the EEMBC website.
To build or compile the application code, click Project, and
then click Rebuild All from the dropdown list.
Figure 25 shows the EEMBC EnergyMonitor hardware, and the
VCC and GND pins used to power the EV-COG-AD3029LZ
evaluation board.
VCC
GND
Figure 26. Build Project
Setting Up the Board to Download the Code
Download the code via USB.
If the EEMBC ULPBench_Phase1 project has been downloaded
previously, the device is in hibernate mode for the majority of
the time when in operation. In deep sleep mode (both hibernate
and shutdown modes), the serial wire is disabled and it is not
possible to download code. Press and hold the boot button, then
press and release the reset button, and then release the boot
button to program the device again.
The board setup for ULPBench is as shown in Figure 27.
Connect the connectors from the EnergyMonitor hardware to
the TH3 jumper as shown in Figure 27.
Figure 25. EEMBC EnergyMonitor Hardware
Installing the EnergyMonitor Software Drivers
When the EnergyMonitor hardware is connected to the PC for
the first time, a USB driver message appears because it is an
unrecognized USB device.
When the USB driver message appears, click Next, and then
click Manually locate USB drivers.
If the driver message does not appear, from Start, open the
Device Manager and locate the devices named EEMBC
Application UART1 and EEMBC Energy Tool V1 to install the
driver on each device.
Install the USB drivers, which are located at /bin/USB_CDC/
monitor_driver.inf and /bin/USB_CDC/monitor_driver.cat.
A security warning appears indicating that the publisher cannot
be verified. Click Install this driver software anyway.
Figure 27. Hardware Setup for ULPBench
By default, 64-bit versions of Windows® Vista and later versions
of Windows only load a kernel mode driver if the kernel can
verify the driver signature. If using one of these versions of
Windows and the drivers cannot be installed, use the appropriate
mechanisms to temporarily disable the load time enforcement
of a valid driver signature (the appropriate mechanism depends
on the Windows version).
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Figure 29 shows the output of the A1-1 pin during the
execution of the workload.
RUNNING THE BENCHMARK
Running the ULPBench Core Profile
This section provides a step by step account of how to set up the
EV-COG-AD3029LZ evaluation board for measuring the
ULPBench Core Profile score.
1. Connect the USB cable to the EnergyMonitor hardware.
2. Remove the debugger.
3. Remove all of the jumpers except TH2, TH1, JH4 and
JH10.
4. Connect the VBAT cable from the EnergyMonitor
hardware to the TH3 jumper.
Proceed to measure the score by starting the EnergyMonitor
software and clicking Run ULPBench. The EnergyMonitor
hardware powers the EV-COG-AD3029LZ evaluation board and
measures the energy consumption of the core profile. At the end
of the run, the software calculates the EEMBC ULPBench Core
Profile score and displays it on screen. The software also displays
the average energy consumed for previous cycles in the history
window.
Figure 29. Verification of Proper Operation
Running the ULP Crystalless Profile
If an application does not require an accuracy as high as the one
provided by a crystal, a low frequency oscillator (LFOSC) can
be used as the source clock of the real time clock (RTC) to
reduce the energy consumption. The LFOSC and low frequency
crystal (LFXTAL) frequencies are 32 kHz.
The score obtained for typical devices is around 250 EEMarks™-CP.
This value can vary depending on process and temperature
conditions. Figure 28 shows an example of a score for a typical
device.
The distributed code includes a define directive (Line 51 of the
Platform.c file) to allow testing of the ULPBench Crystalless
Profile. Uncomment the define USE_LFOSC line to use the
LFOSC as the RTC :
#define USE_LFOSC
The score obtained for typical devices is around 265 EEMarks™-CP.
This value can vary depending on process and temperature
conditions. Figure 30 shows an example of a score for a typical
device.
Figure 28. Example ULPBench Core Profile Score
Verifying the Proper Operation
To ensure that the workload is executing properly, a status pin
(A1-1) is defined. Connect the EV-GEAR-EXPANDER1Z to the
EV-COG-AD3029LZ; Pin A1-1 is configured as the status pin
in the certified code.
According to the benchmark, the workload is executed twice,
and at the beginning, the A1-1 status pin toggles 20×. When the
second workload finishes, the A1-1 pin clears, unless an error
triggers.
Figure 30. Example ULP Crystalless Profile Score
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Per the ADuCM3027/ADuCM3029 data sheet, the typical value
for an active current is 38 µA/MHz, and 830 nA with LFXTAL
and RTC enabled for a hibernate current. Figure 29 shows that
the active time duration is 420 µs.
RESULTS ANALYSIS
The ULPMark-CP uses the following formula that takes the
reciprocal of the energy values (median of 5× the average
energy per second for 10 ULPBench cycles).
Energy = Voltage × Current × Time
1000
EEMarkCP
Energy (µJ) =
Active Energy = 3 V × 1188 µA × 0.42 ms = 1.49 µJ
Sleep Energy = 3 V × 830 nA × 999.58 ms = 2.49 µJ
The consumed energy is obtained as the sum of the energy
consumed when the device is executing the workload (in active
mode) and when the device is in hibernate mode.
Per the ADuCM3027/ADuCM3029 data sheet and the execution
time, the energy for the active current is 1.49 µJ, and the energy
consumed during the sleep time is 2.49 µJ. The score according
to those values matches the ones measured with the EEMBC
EnergyMonitor software.
Energy = Active Energy + Sleep Energy
1000
252.1
Energy (µJ) =1.49 + 2.49 = 3.98 µJ ≅
= 3.96 µJ
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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