Cypress DCT-1D Podręcznik Użytkownika Pobierz pdf (Strona 17)

1.4. SOFTWARE

Command Explanation

d <addr> display memory content

m <addr> <data> modify memory content

g <addr> go (execute)

l load Intel hex ﬁle

u boot uClinux (copy from FLASH)

Table 1.2: Some useful commands in the monitor.

A simple program.

In this section we will demonstrate how to compile, load and run a C-program in the

monitor evironment. We will use the program described in Listing 1.1 as an example.

Listing 1.1: simpleprog

# i n c l u d e " common .h"

i n t main ( v oi d )

{

i n t Begin_Time , User_Time ;

i n t i ;

p r i n t f ( "Hello␣world !\n" ) ;

Begin_Time = g e t _ t i m e r ( 0 ) ;

f o r ( i = 0; i <1 0 ; i ++) {

l e d ( i ) ; / ∗ S e t t h e l e d d i s p l a y on t h e c a r d ∗/

p r i n t f ( "%d\n" , i ) ;

s l e e p ( 1 ) ; / ∗ s l e e p 1 s ∗/

}

User_Time = g e t _ t i m e r ( Begin_Time ) ;

p r i n t f ( "Time=␣%d␣s\n" , User_Time ) ;

re t u r n ( 0 ) ;

}

The program prints a string, counts on the LEDs and measures the elapsed time.

To build simpleprog we use a Makeﬁle described in Listing 1.2, in the Makeﬁle

we observe the following:

• A cross-compiler, or32-uclinux-gcc, must be used.

• The functions printf, get_timer, led and sleep are library functions in

openrisclib, which is included in the lab skeleton for lab 1.

• A link script ram.ld is used to determine where in memory our program should

be located.

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Cypress DCT-1D Podręcznik Użytkownika Strona 17