DSP Development System - Digital Signal Processing and Applications with the C6713 and C6416 DSK - page 35

-l ] must be used when linking. The object file prog1.obj is linked with the library
file(s) and creates the executable file prog1.out . Without the -o option, the exe-
cutable file a.out (by default) is created.
The linker can also be invoked with the compiler shell command with the -z
option

Cl6x -gks -o3 prog1.c prog2.asm -z -o prog.out -m prog.map
-l rts6700.lib

to create the executable file prog.out . The -m option creates a map file that pro-
vides a list of all the addresses of sections, symbols, and labels that can be useful for
debugging.
The linker also links automatically a boot program when using C programs to
initialize the run-time environment, setting the entry point to c_int00 . The symbol
_c_int00 is defined automatically when the linker option -c (or -cr ) is invoked.
The function _c_int00 , included in the run-time support library, is the entry point
in the boot program that sets up the stack and calls main . The run-time library
support program boot.c is used to auto-initialize variables. The linker option -c
invokes the initialization process with boot.c . Note that it is defined in the vector
files vectors_intr.asm and vectors_poll.asm .
The topic CD contains all the main source files used in this topic, located in sep-
arate folders, and some support files necessary for many examples and projects are
located in the folder support . Other needed support files are included with CCS
within c:\C6713 .

1.9 ASSIGNMENTS

1. Write a program to generate a cosine with a frequency of 666.66 Hz. Verify
your output result using LINE OUT, as well as plotting the generated cosine
in both time and frequency domains.
2. Write a polling-based program so that once dip switch #3 is pressed, LED #3
turns on and a 666.66 Hz cosine is generated for approximately 5 seconds.
[ Hint : also use (incorporate) the delay associated with turning a LED on.]
3. Write a program to multiply two arrays, each containing the five numbers 1,
2, 3, 4, and 5 (i.e., 1 2 5 2 ). Verify your result using a watch window

and printing it within CCS in the Build window.
4. Write an interrupt-driven program to capture an input sinusoidal signal of
amplitude 3 V p-p and a frequency of 1 kHz, and output that sampled signal
every 0.0625 ms. Use the function input_sample in a similar fashion as the
function output_sample used in Examples 1.1 and 1.2—for example,

+ 2 2 + 3 2 + 4 2 +

input = input_sample();