Cypress DCT-1D Guía de usuario descargar pdf (Pagina 48)

CHAPTER 4. LAB TASK 2 - DESIGN A JPEG ACCELERATOR

servers to be left af ter you log out since this would prohibit other lab groups from

starting a TFTP server.)

4.3.3 Downloading applications via TFTP

In order to download and run the hello application we must use tftp. First, hello has

to be copied to the tftp directory in your home directory. After that you can write the

following commands in µClinux:

/> cd /mnt

/mnt> tftp 192.168.0.62

tftp> get hello

Received 28664 bytes in 0.8 seconds

tftp> quit

/mnt> chmod 755 hello

/mnt> hello

Hello uClinux!

/mnt>

Laboration task 7

Download and test

hello

It can be noted that tftp sometimes says “Not a typewriter” and aborts the transfer.

This has not been fully debugged yet unfortunately. If it happens to you, just try again,

it rarely happens twice in a row.

4.4 Introduction to jpegﬁles

In this lab series we will be using and enhancing a library written originally by the

Independent JPEG Group. (IJG)

The software package has been somewhat modiﬁed by us for the T SEA44 course.

First of all, we have removed a lot of ﬁles that are not needed for a µClinux target

(conﬁguration ﬁles and Makeﬁles for other platforms, etc). Some of the more interest-

ing functions have been instrumented with performance counters in order to measure

how much of the CPU time is spent in these functions. Finally, we have modiﬁed the

DCT handling code to correspond to the verilog source code for the 1D DCT which is

used in the lab skeleton.

4.4.1 Important ﬁles in the lab s keleton

In this section we describe a number of important ﬁles that you will need to look at in

this lab.

• Makefile Contains the build instructions. If you need to modify the compilation

ﬂags, this is the ﬁle to look inside.

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 81 82

Sin comentarios

Cypress DCT-1D Guía de usuario Pagina 48