1/4/2014TI Information - Selective Disclosure1 Complementing ARM with easy DSP development for TI's...

04/10/23 TI Information - Selective Disclosure 1

Complementing ARM with easy DSP development for TI's community platforms

Daniel Allred

Senior Applications Engineer


Find the right ARM® Solution for you

32-bit ARMCortex™-M3

MCUs

DSPARM+DSP

ARM Cortex-A8 &

ARM9™ MPUs

Stellaris®

ARM Cortex-M3

Sitara™

ARM Cortex-A8& ARM9

C6000™

DaVinci™

Digital Media processors

Integra™

Up to 80 MHz

Flash8 KB to 256 KB

USB, ENET MAC+PHY CAN, ADC, PWM, SPI

Connectivity,Security,Motion Control, HMI,Industrial Automation

$1.00 to $8.00

32-bit ARM MCU for

Safety-Critical Applications

TMS570ARM

Cortex-R4™

Up to 250 DMIPS/ 160 MHz

2 MB Flash, 160 KB RAM

FPU, ECC, Timer/PWM Co-Proc, 12bit ADCs, CAN,

EMIF, LIN, SPI, Flexray

Transportation, Motor Control, Certified for use in safety critical (SIL3) systems

$7.00 to $18.00

375MHz to >1GHz

Cache, RAM, ROM

USB, CAN, SATA,SPI, PCIe, EMAC

Industrial automation, POS & portable

data terminals

$5.00 to $25.00

300MHz to >1Ghz +Accelerator

Cache RAM, ROM

USB, ENET, PCIe, SATA, SPI

Floating/Fixed PointVideo, Audio, Voice,

Security, Conferencing $5.00 to $200.00

Comprehensive developer ecosystemS

oftw

are

supp

ort

Developm

ent tools

Responsive design support

Peripheral I/O DVI-D video out SD/MMC S-Video out USB 2.0 HS OTG I2C, I2S, SPI,

MMC/SD JTAG Stereo in/out Alternate power RS-232 serial

Fast, low power, flexible expansion Rev C

3.1”

OMAP3530 Processor 720MHz Cortex-A8

NEON+VFPv3 16KB/16KB L1$ 256KB L2$

430MHz C64x+ DSP 32K/32K L1$ 48K L1D 32K L2

PowerVR SGX GPU 64K on-chip RAMPOP Memory 256MB LPDDR RAM 256MB NAND flash

USB Powered 2W maximum consumption

OMAP is small % of that Many adapter options

Car, wall, battery, solar, …

$149

Laptop-like performanceDesktop-style USB

peripherals and embedded style

expansion

DM3730 processor(AM37x-compatibile)

1GHz superscaler ARM® Cortex ™-A8

More than 2,000 Dhrystone MIPS

Up to 20 Million polygons per sec graphics

512KB L2$ 512MB LPDDR

RAM HD video capable

C64x+™ DSP core

3.35”**

DM3730

LCD Expansion I2C, I2S, SPI,

MMC/SD Expansion

DVI-D Camera Header S-Video JTAG 4-port USB 2.0

Hub Stereo Out Stereo In 10/100 Ethernet USB 2.0 HS OTG Alternate Power RS-232 Serial microSD Slot

BeagleBoard-xM details

Agenda

• Motivation for ARM+DSP heterogeneous processors

• Importance of Software Development

• C6000 DSP Ease of Use Initiatives– C6Accel

– C6Run

• Conclusion

• Demo

• Q&A


Why ARM+DSP?

• Lets start with an example system


Networked Audio System (before)


C674x

Audio DSP

ARM9USB HostController

HDMI SPDIF ADC

SDRAM

SDRAM

FLASH

FLASH

EthernetMAC

InternetRadio

InternetRadio

LCDController

SD/MMCController

I2S/I2C

Problem - Adding connectivity to an audio system adds:• Cost• Components/Size• Development complexity

DACDACDAC

Audio SystemConnectivity System

Networked Audio System (after)


HDMI SPDIF ADC

SDRAM FLASH

InternetRadio

InternetRadio

DACDACDACUSB HostController

3 Mbit RAM

8 MbitROM

EthernetMAC

LCDController

SD/MMCController

Software LinkARM9450MHz

C674x DSP450MHz

OMAP-L137Audio System on a Chip

SerialPorts

I2C/SPI/UART

EQEP/ECAP

Buttons/Knobs

PWM

What can an ARM developer do with the DSP?

• Run math intensive algorithms

• Leverage some DSP features, like floating-point computations

• Free up ARM MIPS for additional system features

• Save money by not moving to a more powerful & expensive ARM!

• Get true real-time response via DSP without sacrificing features of a high-level OS like Linux


Agenda




– C6Run

• Conclusion

• Demo

• Q&A


Importance of software in embedded development

0

2

4

6

8

10

12

14

2009 2010

HW Engrs

SW Engrs

Most important embedded processor

selection criteria

Most important embedded processor

selection criteria

Average embedded team size

Average embedded team size

1414

99

4455

Companies are dedicating more resources to softwareCompanies are dedicating

more resources to software

Purchase decisions are driven by software

Purchase decisions are driven by software

Source: US EE Times/ESD annual embedded developer survey (Jan/Feb ‘10)Source: US EE Times/ESD annual embedded developer survey (Jan/Feb ‘10)

Changing face of TI DSP developers

• ARM+DSP devices provide an opportunity for TI and our customers

• Example: Beagleboard– Greater than 10000 sold, each one containing a C64x+ DSP– How do we connect with those developers?

Agenda




– C6Run

• Conclusion

• Demo

• Q&A


Embedded Developers Customer Needs

System developer More ready-to-use DSP functionality with audio, video and voice codecs

ARM® developer Leverage the DSP without specialized knowledge

Advanced User/Developer Optimized libraries, real-time OS and development tools

Tool

C6Accel\

C6Run

Libraries, DSP RTOS, IPC

Universe of embedded developers – leveraging the DSP

Experience with C6Accel!

ARM® processor DSP

Audio, Video Codecs

C6AccelDSPLIB IMGLIB

MATHLIB

Co

dec E

ng

ine

hC6accel = C6accel_create( engName, NULL, algName, NULL);………………..Status = C6accel_DSPfunction(hC6accel, parameters);……………………C6accel_delete(hC6accel);

• Above converts C code creates a C6Accel handle with the codec server

• Passes function ID for DSP kernel, manages cache and contiguous memory required to pass input parameters, makes iUniversal process call to the codec engine and returns error status.

• Closes the C6Accel instance

C6Run overview

• Open Source Project, hosted on gforge.ti.com

• Intends to provide an abstracted mechanism for getting code running on the DSP

• Project Goals– Introduce DSP Development to ARM/Linux developer– Simplify simple application/function offloading to the DSP– Start getting Linux and open-source community using the DSP

• C6RunLib: Partition an application between the ARM and DSP

• C6RunApp: Run an entire application on the DSP


C6RunLib

• Goal is to automate building an ARM-side library from user’s C code of critical functions

• User can call into that library in their app, and calls will be executed on the DSP

• Consists of automating creation of RPC framework, hiding DSPLink and other TI specific bits as possible

ARM DSP

ARM Application

C6RunLib Framework

Stub LibraryCriticalFxns

Extract Critical Fxns as a library using C6RunLib


module1.c

module2.c

main.c

critical.c GCC Toolchain

ARM Executable

GCC Toolchain

module1.c

module2.c

main.c

critical.c

c6runlib tools

critcal.lib

ARM-only Development

ARM+DSP Development with c6runlib

ARM Executable

Embedded DSP

Executable

Example C6RunLib usage

$ c6runlib-ar rcs dummy_dsp.lib dummy.o

$ c6runlib-cc -c -O2 –o dummy.o dummy.c

• Add object file to library dummy_dsp.lib

• Underneath, the dummy.o object file is linked to a DSP executable and compiled into the framework

• Framework object file and stubs object file is archived into the lib

• ARM-side stubs resolve symbols for ARM application when built against the library

• Above converts C code containing critical functions to C6000 object file

• Also analyzes global C functions and generates ARM-side remote procedure call stubs


C6RunApp

• Consists of two parts– Backend library builds– Front end user interface

• Backend libraries collate DSPLink, CMEM, DSP/BIOS, and custom code

• Front end interface is a command-line cross compiler script (acts like GCC)

• Entire application retargets to DSP, but with C I/O access to ARM/Linux

• Ready now (support for OMAPL1, OMAP3, including hawkboard, beagleboard)

ARM DSP

Recompile using C6RunApp

C6RunApp Framework

DSP Loader and CIO Server

C Application


module1.c

module2.c

main.c

GCC Toolchain

ARM Executable

ARM-only Development

module1.c

module2.c

main.c

c6runapp tool

ARM Executable

DSP Development using c6runapp

Embedded DSP

Executable


Example C6RunApp usage

$ c6runapp-cc -o hello_world hello_world.c

• Compiles hello_world.c to C6000 object file, which is then linked into a DSP executable

• Executable is compiled into the ARM side framework, which is used to build an ARM-side executable called hello_world

• Notes on the c6runapp-cc cross-compiler tool:

• Front end script wraps the TI C6000 Codegen tools (specifically cl6x)

• Supports many GCC options and translates them to appropriate cl6x options

• Many GCC optimization/warning options are silently ignored

• Unknown options passed directly to cl6x command-line04/10/23 TI Information - Selective Disclosure 23

Complex FFT performance

SoC: ARM9 + Floating-Point DSP

CPU Frequency: 300MHz

Code & Data Location: External DDR2 Memory

Instruction and Data Cache: Enabled

Single-precision floating-point data buffers.

FFT Size

To

tal

Ex

ec

uti

on

Tim

e

(s)

Fo

r 1

00

FF

T

Ite

rati

on

s

FFT runs ~10x faster on DSP than on ARM.

Small FFT size, overhead dominates, running on DSP does not provide advantage.

Larger FFT size, overhead absorbed, running on DSP provides advantage.


Agenda




– C6Run

• Conclusion

• Demo

• Q&A


Status and availability

• Documentation available on TI’s Embedded Processor Wiki– http://processors.wiki.ti.com/index.php/C6Run

– http://processors.wiki.ti.com/index.php/C6Accel

• Latest package is available at TI’s website– http://focus.ti.com/docs/toolsw/folders/print/c6run-dsparmtool.html

– http://focus.ti.com/docs/toolsw/folders/print/c6accel-dsplibs.html


Conclusion

• TI believes ARM+DSP devices can offer our customers an advantage in system integration and design

• TI is committed to helping our customers leverage the power of the DSP by offering easy to use software development solutions

• C6Accel and C6Run are quick ways for the ARM developer to gain access the capabilities of the DSP using the ARM/Linux operating system


Demo

• Building Code with C6Run

• Running C6Run/C6Accel Applications

• Questions


Date post:	26-Mar-2015
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1/4/2014TI Information - Selective Disclosure1 Complementing ARM with easy DSP development for TI's...

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