1. Lab #1 Introduction to Hardware & Software Tools of TMS320C6748 DSK
EE 445S Real-Time Digital Signal Processing Lab Fall 2013
Lab #1 Introduction to Hardware & Software Tools of TMS320C6748 DSK 1

2. Outline Introduction C6748 DSK Board C6748 DSP
C6700 Instruction Set Architecture
DSP/BIOS
Code Composer Studio
winDSK
LabVIEW
MATLAB/MathScript 2 2

3. Introduction
Goal is to implement communication system components by writing C and/or assembly language programs for the TI TMS320C6748 fixed/floating- point DSP.
C6748 DSP resides on the OMAP-L138EVM board which connects to the PC by USB. 3 3

4. Fixed vs. Floating Point DSP’s
Fixed Point DSP’s (Modems, Controllers, Phones…)
Cheaper and consume less power
Need special care when programming to avoid overflows
More dominant in the market
TMS320C1x, ’C2x, ’C20x, ’C24x (16 bit, for control)
’C5x, ’C54x, ’C55x (16 bit, wireless phones and modems)
’C62x, ’C64x (16 bit, DSL, imaging, video)
Floating Point DSP’s (DSL, Video, Imaging…)
Easier to program,
Complex architecture (more computationally demanding)
More expensive.
’C3x, ’C4x, ’C67x (32-bit, DSL, imaging, video) 4 4

5. Advantages of DSP’s vs. Analog Circuit
Can implement complex linear and non-linear algorithms,
Application can be modified simply by changing code,
Highly reliable,
Manufacturing is fairly easy. 5 5

6. OMAP-L138 Functional Block Diagram6 6

7. Functional Units .M Multiplication Unit:
16-bit × 16-bit, 32-bit × 32-bit, 64-bit × 64-bit
.L Logic Unit:
Arithmetic, comparisons and logic operations.
.S Shifter Unit:
Bit manipulation (set, get, shift, rotate).
.D Data Unit:
Load/Store to/from memory (exclusively)
Performs addition and pointer arithmetic. 7

8. DSP Features
375/456-MHz Fixed/Floating-Point – Load-Store Architecture with VLIW architecture.
10/100 Mb/s Ethernet MAC (EMAC)
USB2.0 OTG, USB1.1 OHCI interface
Two inter-integrated circuit (I2C) bus interfaces
One multichannel audio serial port (McASP)
Two multichannel buffered serial ports (McBSP) with FIFO buffers
Two SPI interfaces with multiple chip selects.
Four 64-bit general-purpose timers. 8 8

9. DSP Features (Contd.) Configurable 16-bit host port interface (HPI).
9 banks of 16 pins of general-purpose input/output (GPIO) with programmable interrupt/event generation modes.
Three UART interfaces
Asynchronous and SDRAM external memory interface (EMIFA) for slower memories or peripherals.
A higher speed DDR2/Mobile DDR controller.
A Video Port Interface (VPIF) 9

10. TMS320C6748 Megamodule Block Diagram10

11. DSP Features (Contd.) C674x Two Level Cache Memory Architecture
– 32K-Byte L1P Program RAM/Cache
– 32K-Byte L1D Data RAM/Cache
– 256K-Byte L2 Unified Mapped RAM/Cache
– Flexible RAM/Cache Partition (L1 and L2)
Enhanced Direct-Memory-Access Controller 3 (EDMA3)
– 2 Channel Controllers
– 3 Transfer Controllers
– 64 Independent DMA Channels
– 16 Quick DMA Channels
– Programmable Transfer Burst Size 11

12. C6748 Floating-Point VLIW DSP Core
Load-Store Architecture With Non-Aligned VLIW DSP Support
Supports TI’s Basic Secure Boot – 64 General-Purpose Registers (32 Bit)
Six ALU (32-/40-Bit) Functional Units
• Supports 32-Bit Integer, SP (IEEE Single Precision/32-Bit) and DP (IEEE Double Precision/64- Bit) Floating Point
• Supports up to Four SP Additions Per clock, Four DP Additions Every 2 clocks. 12

13. C6748 Floating-Point VLIW DSP Core (Contd.)
Two Multiply Functional Units
Mixed-Precision IEEE Floating Point Multiply Supported up to:
– 2 SP x SP → SP Per Clock
– 2 SP x SP → DP Every Two Clocks
– 2 SP x DP → DP Every Three Clocks
– 2 DP x DP → DP Every Four Clocks
Fixed Point Multiply Supports Two 32 x 32-Bit Multiplies, Four 16 x 16-Bit Multiplies, or Eight 8 x 8-Bit Multiplies per Clock Cycle, and Complex Multiples 13

14. DSP/BIOS
A real-time operating system specific to the Texas Instruments DSPs.
DSP/BIOS provides a wide range of system services to an embedded application:
Preemptive multitasking
Memory management
Real-time analysis. 14

15. DSP/BIOS features The scheduler Memory manager
Its associated thread classes provide a mechanism for arranging and controlling the software’s execution.
Memory manager
control the operation of the memory/ cache architecture and control allocation of memory resources.
Periodically interrupt the currently executing thread
Determine what the highest priority thread is that is ready to execute
Start that thread running
Hardware timers 15

16. DSP/BIOS features (Contd.)
Instrumentation
provides deterministic, minimally-invasive analysis, profiling, and statistical functions.
Communications resources
queues, pipes, streams and a device driver mechanism.
Support libraries
provide standardization of access and hardware abstraction across multiple DSPs. 16

17. DSP/BIOS Thread Types HWI SWI Priority TSK IDL Hardware Interrupts
Implements ‘urgent’ part of real-time event
Hardware interrupt triggers ISRs to run
Priorities set by hardware
HWI
Hardware Interrupts
Performs HWI ‘follow-up’ activity
‘posted’ by software
PRDs (periodic functions) are prioritized as SWIs
14 priority levels
SWI
Software Interrupts
Priority
TSK
Tasks
Runs programs concurrently under separate contexts
Usually enabled to run by posting a ‘semaphore’ (a task signaling mechanism)
15 priority levels
Using PRDs in a TSK-based video system is not really recommended because PRDs will ALWAYS have a higher priority than TSKs because PRDs are prioritized as SWIs.
IDL
Background
Multiple IDL functions
Runs as an infinite loop (like traditional while loop)
Single priority level 17

18. Code Composer Studio
CCS is TI’s proprietary IDE that provides a transition between a high-level DSP program and an on-board machine language program. It is used to:
Generate programs for the C6748 DSP using C language,
Load them into the DSK,
Run them,
Monitor program execution. 18 18

19. winDSK A windows-based DSP demonstration program
No need of other software.
Direct communication with DSP board through serial port
Demonstration of all the projects are available. 19 19

20. LabVIEW Laboratory Virtual Instrumentation Engineering Workbench.
It is a powerful IDE for data acquisition, instrumentation, analysis, signal processing, control…
LabVIEW programs called Virtual Instruments (VI’s).
Each VI has 2 components:
Front Panel: user interface of the VI, has all controls and indicators for I/O.
Block Diagram: code is added using graphical representations of functions to control front panel objects. 20 20

21. LabVIEW Online LabView Interactive Tutorial can be found at:
Front Panel
Block Diagram
Online LabView Interactive Tutorial can be found at: 21 21

22. MATLAB MATrix LABoratory.
It is a numerical computing environment and programming language.
Allows easy matrix manipulation, plotting of functions and data, implementation of algorithms, creation of GUI’s…
Includes many specialized toolboxes that extend the regular MATLAB environment (communications, Control, Signal Processing…). 22 22

23. MATLAB Command Window Workspace Current Directory Command History 23

24. MATLAB MATLAB Help is very practical and user-friendly.
Can access the MATLAB Help by pressing F1, or going to “Help → MATLAB Help”.
Also, in the Command Window, can type
help <function_name> to show the help document of a given function.
lookfor <keyword> to searche all help documents for a given keyword.
MATLAB Tutorial can be found at s/ 24 24

25. MathScript http://zone.ni.com/devzone/cda/tut/p/id/3502
Software from LabVIEW.
Same syntax as MATLAB but does not support all functions available in MATLAB.
Appendix D in course reader 25 25

26. …The End!
See You Next Week! 26 26