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String Routine

 
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Pilt1
Guest
String Routine
PostPosted: Wed May 24, 2006 3:34 pm     Reply with quote
I wish to pass a string to a function and send each character seperatly

This is my function at the moment

Code:

void send_string(char string[10]) //need to use pointers
{

int8 i;

for(i=0;string[i] != '/n' ;i++)
{
send(string[i]);

}



I wish to call the function like this

Code:

send_string("Hello");



As you can see i wish to send the first character first and stop after the last character. That why i used the /n character to represent the character after last although i dont think it is correct?

How can i do this?

Thanks


Pilt
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

View user's profile Send private message

PostPosted: Wed May 24, 2006 3:45 pm     Reply with quote
You can't pass a pointer to a constant string in CCS. You have to
copy the string to a RAM array first, and then pass the address of
the array. Use the CCS function strcpy() to do this.

But maybe you don't need to do that. It seems that you want to
send characters to a special function that will transmit them.
CCS has a special feature of the printf() function, where the output
of printf is sent to a specified function, one character at a time.
In the example program below, the output of printf() is sent to
the send_char() function. (I have renamed your "send_string()"
function to "send_char").
Code:
#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

//-------------------------
send(char c)
{
putc(c);
}

//-------------------------
void send_char(char c) 
{
send(c);
}

//====================================
void main()
{
printf(send_char, "Hello");

while(1);
}
pilt1
Guest
PostPosted: Wed May 24, 2006 3:58 pm     Reply with quote
Yeah sorry was ment to delete the comments regarding pointers.

The reason i am doing it using this method is because i am passing the value to a 8 bit wide port on the uP which connects to another chip (Usb Chip)

The send method places the 8 bit wide data on the port and triggers another ouptut to tell the other chip to accept the data. Therefore to send a string i pass each byte using the send(byte); function.

Thanks

Pilt
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

View user's profile Send private message

PostPosted: Wed May 24, 2006 4:17 pm     Reply with quote
In that case, the program below will show how to do it.
Code:

#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

#define STROBE PIN_C0

//-------------------------
send(char c)
{
output_d(c);   // Write char to port D

delay_us(1);

output_high(STROBE);   // Create short pulse
delay_us(1);
output_low(STROBE);

}

//====================================
void main()
{

printf(send, "Hello");

while(1);
}
pilt1
Guest
PostPosted: Thu May 25, 2006 12:39 pm     Reply with quote
Thanks that is exactally what i needed!


Cheers

Pilt
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