CPU load

8

ISF2P1_KINETIS_RELEASE_RN, 1.0, 11/2015

Freescale Semiconductor, Inc.

Component

Code size (bytes)

Description

Flash

SRAM

DEC

HEX

DEC

HEX

ISF_Core (Power Manager)

120

78

26

1D

Component

512

200

Task stack space

Optional ISF Components

ISFEmbApp

942

3AE

232

E8

Basic Application

1280

500

Task stack space

Protocol adapter components

ISF_CommChannel_UART

1212

4BC

0

0

Component

Sensor adapter components

ISF_Sensor_Generic_Analog

1488

5D0

29

1D

Analog Sensor

Minimum and maximum ISF configuration sizes

Minimum ISF configuration, including

MQX™ RTOS

19521

4C41

908

38C

This is the minimal

required configuration of

ISF.

Maximum space available for customer

111551

1B3BF

15476

3C74

This is the maximum

memory available to

customers for application

development.

NOTE: Optimization is set to –Os to optimize for code size.

8 CPU load

The computational load imposed on a system by different applications that use ISF components may

be different it is not possible to measure every instance or configuration. To estimate the CPU load

demanded by an application that uses ISF on the KE06Z Freescale Freedom board, the time required

for ISF to process one sensor data sample is used. The measurement of computational load begins

when the ISF Bus Manager (BM) PIT timer generates an interrupt. The measurement stops when the

user-embedded application receives notification that sensor data is available. Key aspects of the

measurement include KDS 3.0 and the following ISF components:

•

DSA Direct, Bus Manager (BM), and the Generic Analog sensor adapter

•

MQXLite RTOS embedded in KDS 3.0 as a Processor Expert component

— The source code was compiled with optimization set for size in order to provide the smallest

code size.