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How to generate this string?

 
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zhiling0229



Joined: 13 Sep 2006
Posts: 10

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How to generate this string?
PostPosted: Fri Oct 06, 2006 9:39 am     Reply with quote

Hi guys,

I'm trying to implement a V-stamp speech synthesizer driver.

I required to generate the text, then followed by CR or NUL. Was wondering how can I terminate with CR or NUL. Here is my test program.

#include <16F877A.h>
#use delay(clock=4000000)
#fuses XT, NOBROWNOUT, NOLVP, NOWDT
#use rs232(baud=2400, xmit=PIN_A2, rcv=PIN_A3)


struct lcd_pin_def
{
BOOLEAN B0; // B0
BOOLEAN B1; // B1
BOOLEAN B2; // B2
BOOLEAN B3; // B3
BOOLEAN B4; // B4
BOOLEAN B5; // B5
BOOLEAN B6; // B6
BOOLEAN B7; // B7

};

struct lcd_pin_def LCD;

#byte LCD = 0x06 // portB address on 16F877A


#use fast_io(D)

void main() {

set_tris_b(0x00); // graphic lcd control lines all output


LCD.B0 = 1;
delay_ms(2000);
LCD.B0 = 0;

printf("Testing 1 2 3"); // What should I change here?


}
Ttelmah
Guest







PostPosted: Fri Oct 06, 2006 10:27 am     Reply with quote

printf("Testing 1 2 3\r");

C supports various 'escape' characters. '\n', means 'LF', '\r', 'CR', etc..
You can generate any ASCII character, using \nnn, where 'nnn' is the 3 digit octal value to send, and \Xnn, using a hex value. It is standard in C, and mentioned in the manual, under 'expressions'.

Best Wishes
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Fri Oct 06, 2006 10:32 am     Reply with quote

Quote:

printf("Testing 1 2 3"); // What should I change here?


CR: Carriage Return
Is an old command name used in the Telex machines and electric typewriters.
It was used in conjunction with LF (Line Feed) whose hex equivalent is 0x0A.


#define CR 0x0D // CR: Carriage Return

printf("Testing 1 2 3%c", CR);

or

printf("Testing 1 2 3\r);


Humberto
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