1 Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0 Real-Time Software Components A Scalable Component Model for Embedded C Development Dave Russo, Texas Instruments Eclipse DSDP/RTSC Project Lead © 2008 by Texas Instruments; made available under the EPL v1.0 | Feb 12, 2008
Ese 2008 RTSC Draft1
Jul 06, 2015
Introduction to the RTSC component model for embedded systems
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1Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
Real-Time Software ComponentsA Scalable Component Model for Embedded C Development
Dave Russo, Texas Instruments
Eclipse DSDP/RTSC Project Lead
© 2008 by Texas Instruments; made available under the EPL v1.0 | Feb 12, 2008
2Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
In 25 Words Or Less ....
RTSC provides a C-based software component
model for developing, delivering, and deploying
re-usable real-time software targeted
for diverse embedded platforms
without compromising system performance !
QUALITY
3Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
A
target-code
RTSC Components
Key Characteristics
dual-existence• target-code: runs on resource limited HW• meta-code: runs on rich client platforms
meta-code manages component lifecycle• build of component (including target-side)• integration during application assembly• monitoring during test and after deployment
Benefits
significant design-time optimizations• transparently bind alternate implementations• objects can be created at design-time• no embedded runtime requirements
enables new tooling opportunities• meta-code can proxy for target-code• components differentiate in meta-domain
Application Application
C
target-code(C)
RTSC Component C
target-code(C)
meta-code(JavaScript)
B
target-code(C)
RTSC Component B
target-code(C)
meta-code(JavaScript)
A
target-code
RTSC Component A
target-code(C)
meta-code(JavaScript)
Rich Client Platform Embedded Platform
4Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
Component-Based Systems
R S R S′
INTERCHANGEABILITY
R T C
S
REUSABILTY
Essential Characteristics
Basic Requirements
UNIFORM PACKAGING
CONFIGURABLE ASSEMBLYFORMAL SPECIFICATIONS
5Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
standard Cfunctions & structs
MODULE INTERFACE
standard Cfunctions & structs
Programming-In-The-Large
1000s100s10s
MODULE INTERFACE
PACKAGE
standard Cfunctions & structs
logical & physical software container headers, libraries, progs, scripts, docs, ... managed, versioned, delivered as a whole multiple targets, platforms, configurations explicit dependencies on other packages
encapsulates cohesive { types, fxns } external client contract — “spec” internal implementation — “body”
abstract module — spec but no body extended & implemented by others enables generic client applications
concrete & closed abstract & open
6Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
RTSC .h
RTSC .h
generated headers
RTSC Specification
MODULE SPECIFICATION
INTERFACE SPECIFICATION
#include
#include
MODULE IMPLEMENTATION
// implement specified fxns
// natural map to ANSI C
// call existing C or ASM fxns
// access specified configs
// formalize best practices
// fun-to-write, easy-to-read
eliminates tedious maintenance of headers
separates specification from implementation
standardizes advanced programming patterns
C-like declarations, assertions, commentary
bridges SW design • development phases
readily integrates with other SW tooling
package a_std;
interface IA{ enum E {E1, E2}; int fxn1(char *b);}
package my_pkg;
module ModA inherits a_std.IA{ config int max; Bool fxn2(E e);}
.c
.xdc
.xdc
7Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
RTSC Packaging
PACKAGE SPECIFICATION version dependencies to ensure integrity
physical organization reflects logical design
contents remain intact during deployment
universal OS-independent + CM-agnostic
PACKAGE DEPLOYMENT
my_pkg/ your_pkg/
a_std/
c:/work; h:/share; …package-repository path
PACKAGE MANIFESTATION
source files
generated files
my_pkg/
special files
requires your_pkg [1,3];
package my_pkg [2,4,5] { interface IA,ICodec, … ; module ModA, … ;}
.xdc
8Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
HWA BHWA BHWA B
MEG4 Packageti.omap.mpeg4
platformindependent
timer Ctimer BHWA1
timer Ctimer BDMA1
Application Configuration
RTSC Assembly
RTSC enables rapid tuned (re)assembly of binary components
appconfigscript
platform: 'ti.platforms.omap3430'target: 'ti.targets.C64'
platformbinding
HWA BHWA BHWA B
MEG4 Packageti.omap.mpeg4
platformindependent
timer Ctimer BHWA1
timer Ctimer BDMA1
Task = xdc.useModule('ti.bios.Task');MP4 = xdc.useModule('ti.omapsw.mpeg4.ENC');G723 = xdc.useModule('3p.codecs.g723.ENC');MP4.profile = "base";
:
G726 Package3p.codecs.g726
platformindependent
G723 Package3p.codecs.g723
platformindependent
DSP/BIOS Packageti.bios
platformindependent
DMA3DMA2DMA1
timer3timer2timer1
timer3timer2timer1
platform: 'ti.platforms.evm6446'target: 'ti.targets.C64'
timer Ctimer BHWA1
Platform Packageti.platforms.omap3430
C64rev 2
HWA1 timer1
Targets Packageti.targets
C64 C28 C55…
Platform Packageti.platforms.evm6446
C64rev 3
HWA2 timer2
extensible to any platform and target
app-specific implementation selection
package-specific platform adaptation
config, package, and platform validation
one configuration tool for all content
DSP/BIOS Packageti.bios
platformindependent
DMA3DMA2DMA1
timer3timer2timer1
MEG4 Packageti.omap.mpeg4
platformindependent
timer Ctimer BHWA1
timer Ctimer BDMA1
G726 Packageti.codecs.g726
platformindependent
G723 Packageti.codecs.g723
platformindependent
Assembly Process
app.cfg app.c
appcfg.o app.o
compile compile
app.exe
link
appcfg.xdl
appcfg.cconfig
9Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
RTSC
. c
. cfg
Extended Object Lifecycle
// include modulesMp3 = xdc.useModule("your_pkg.Mp3");
// create static instancesProgram.global.dec = Mp3.create({x:10, y:20});
#include <your_pkg/Mp3.h>#include <xdc/cfg/global.h>
main() {
for (;;) { Mp3_decode(dec, …); … }}
#include <your_pkg/Mp3.h>
Mp3_Handle dec;
main() {
/* initialize system */
Mp3_Params params;
Mp3_Params_init(¶ms);
params.x = 10; params.y = 20;
dec = Mp3_create(¶ms);
if (dec == NULL) { … }
/* start real-time processing */ for (;;) { Mp3_decode(dec, …); … }}
needs runtime memory manager
“run-once” instance creation code
dead error handling code
no memory allocation required
no runtime initialization errors
only “core” module methods used
A single RTSC module supports both static and runtime use
RTSC
1 implementation, 2 usage models
uniform instance lifecycle APIs
built-in lifecycle monitoring
#include <your_pkg/Mp3.h>
Mp3_Handle dec;
main(int argc, char *argv[]) {
/* initialize system */
Mp3_Params params;
Mp3_Params_init(¶ms);
params.x = atoi(argv[1]);
dec = Mp3_create(¶ms);
if (dec == NULL) { … }
/* start real-time processing */ for (;;) { Mp3_decode(dec, …); … }}
#include <your_pkg/Mp3.h>
Mp3_Handle dec;
main(int argc, char *argv[]) {
/* initialize system */
Mp3_Params params;
Mp3_Params_init(¶ms);
params.x = atoi(argv[1]);
dec = Mp3_create(¶ms);
if (dec == NULL) { … }
/* start real-time processing */ for (;;) { Mp3_decode(dec, …); … }}
10Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
XDCtools
specification language — XDCspec
meta-language — XDCscript ANSI C
packagelife-cycle support
programlife-cycle support
programrun-time support
basic tools & utilities
managed content
specified content
% target software
DSP/BIOS 5.x CodecEngine SYS/BIOS 6.xxDAIS
1999 2004 2006 2007 2009
1.x 2.x 3.x
XDCtools
Accelerate Adoption➼ focus on “ease-of-use”
➼ eclipse integration (CDT, …)
➼ online docs — RTSC-Pedia
➼ emphasize compatibility
➼ open-source XDCtools (EPL)
11Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
Summary
XDCtools is successfully being used by thousands of TI customers
Dual-domain breaks the “generality vs. application-optimized” standoff
RTSC enables “write once, deploy widely” for deeply embedded SW
http://www.eclipse.org/dsdp/rtsc
RTSC-Pedia: all RTSC documentation: primers, FAQs, examples …
RTSC White Paper: high-level introduction to RTSC
XDCtools User’s Guide: using XDCtools to create & use components
XDCtools: the starting point for the RTSC project’s code base
To be successful, we need adoption in the broader embedded community
12Introducing Real-Time Software Component (RTSC) | © 2008 by Texas Instruments; made available under the EPL v1.0
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