MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Betriebsanweisung PDF herunterladen (Seite 384)

100

101

write

Writing Negative Values

Writing a negative value causes the data written to be saturated

because

char is unsigned on the process or. Hence, a 0 (a NU LL) is

written instead. A wa rning resultsaswell,asthisexampleshows.

cc = ticcs;

ff = createobj(cc,'g_char'); % Where g_char is in the code.

write(ff,-100);

Warning: Underflow: Saturation was required to fit the data into

an addressable unit.

When you try to read the data you w rote, the character being read is

0 (NU LL) — so there seems to be nothing returned by the

read function.

You can demonstrate this by the following code, after w riting a negative

valueasshowninthepreviousexample.

readnumeric(x)

ans =

read(x) % Reads the NULL character.

ans = % Apparently nothing is returned.

double(read(x)) % Read the numeric equivalent of NULL.

ans = % Again, appears not to return a value.

Examples The following examples demonstrate how to use write. cc is a ticcs

object.

Connect to a p rocessor and write data to it. In this example, CCS IDE

recognizes one b oard having one p roces sor.

cc = ticcs;

cc.visible(1);

write(cc,'50',1:250);

mem = read(cc,0,'double',50) % Returns 50 values as a column

% vector in mem.

7-162

1 2 ... 379 380 381 382 383 384 385 386 387 388 389 ... 574 575

Kommentare zu diesen Handbüchern

Keine Kommentare

MATLAB EMBEDDED IDE LINK 4 - FOR USE WITH TEXAS INSTRUMENTS CODE COMPOSER STUDIO Betriebsanweisung Seite 384

Kommentare zu diesen Handbüchern