• The 6713 DSP Starter Kit (DSK) is a low-cost platform which lets customers evaluate and develop applications for the Texas Instruments C67X DSP family. The primary features of the DSK are: • · 225 MHz TMS320C6713 Floating Point DSP • · AIC23 Stereo Codec • · Four Position User DIP Switch and Four User LEDs • · On-board Flash and SDRAM • TI’s Code Composer Studio development tools are bundled with the 6713 DSK providing the user with an industrial-strength integrated development environment for C and assembly programming. Code Composer Studio communicates with the DSP using an on-board JTAG emulator through a USB interface. 6713 DSK • 225MHz VLIW DSP core and 256Kbytes of internal memory. On-chip peripherals include a 32-bit external memory interface (EMIF) with integrated SDRAM controller, 2 multi-channel buffered serial ports (McBSPs), two on-board timers and an enhanced DMA controller (EDMA). • The 6713 has a significant amount of internal memory so many applications will have all code and data on-chip. External accesses are done through the EMIF which can connect to both synchronous and asynchronous memories. The EMIF signals are also brought out to standard TI expansion bus connectors so additional functionality can be added on daughter card modules. • on-board codec called the AIC23. Codec stands for coder/decoder, the job of the AIC23 is to code analog input samples into a digital format for the DSP to process, then decode data coming out of the DSP to generate the processed analog output. Digitial data is sent to and from the codec on McBSP1. • The DSK has 4 light emitting diodes (LEDs) and 4 DIP switches that allow users to interact with programs through simple LED displays and user input on the switches. Many of the included examples make use of these user interface options. • The DSK implements the logic necessary to tie board components together in a programmable logic device called a CPLD. In addition to random glue logic, the CPLD implements a set of 4 software programmable registers that can be used to access the on-board LEDs and DIP switches as well as control the daughter card interface. The DSK includes a special version of Code Composer specially tailored to features on the 6713 DSK board. Other versions of Code Composer are available that fully support each of TI’s processor families on a wide variety of hardware targets. • The 6713 DSK includes a special device called a JTAG emulator on-board that can directly access the register and memory state of the 6713 chip through a standardized JTAG interface port. When a user wants to monitor the progress of his program, Code Composer sends commands to the emulator through its USB host interface to check on any data the user is interested in. • Debugging method is extremely powerful because programs can be debugged unobtrusively on real hardware targets without making any special provisions for debug like external probes, software monitors or simulated hardware. When designing your own hardware around the 6713 you can debug your application with the same rich functionality of the DSK simply by using Code Composer with an external emulator and including a header for the JTAG interface signals. Debug • Break point • Watch the Variables • View Memory, Registers • View C and Assembly code • Graph the results • Monitor execution time • Step through program (into, over, out) • RTDX – real time data exchange between DSP board and the PC • When you tell Code Composer to run, it simply starts executing at the current program counter. If you want to restart the program, you must reset the program counter by using Debug à Restart or re-loading the program which sets the program counter implicitly. • After you start a program running it continues running on the DSP indefinitely. To stop it you need to halt it with Debug à Halt. • Open the led.pjt Code Composer project using Project à Open and selecting led.pjt. It is in the directory c:\ti\examples\dsk6713\bsl\led. • Load the led.out executable file. Select File à Load Program. It will open a file browser dialog. Select the led.out file in the led\Debug directory in the file browser and hit "Open" to load the executable file. You must reload the compiled executable every time you make changes to the program. • elect the Debug à Run option under the Debug menu. LED #0 will start blinking slowly. • 9) Move DIP switch #3 up and down, you will see LED #3 change with it. • 10) When you are satisfied that the program is indeed running correctly, stop the program by selecting Debug à Halt. • DSP/BIOS programs are organized such that logically independent parts of a program are executed as independent tasks and threads. In the context of an application like a mobile phone, one task could be assigned to listening for wireless communication transfers, another assigned to wait for user input, another to periodically check the battery level and so on rather than have a single task try to do all of these things at once. In addition to basic task scheduling, DSP/BIOS also includes components that allow communication and synchronization between tasks and devices. • Refer the CCS tutorial for more detail.
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