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Need little help in RS 232

 
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sohailkhanonline



Joined: 06 Mar 2008
Posts: 35
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Need little help in RS 232
PostPosted: Thu Mar 06, 2008 10:25 pm     Reply with quote
i am making a simple program for PIC 16F877 that can read characters serially (RS-232) from computer. then convert that character to integer so that i can make arithmetic modification (e.g multiply it with 5) and then echo or send it back to computer.

I am having difficulty in converting character to integer (i dont know the built in function). I am new to CCS. Please help me.......... Confused
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PostPosted: Thu Mar 06, 2008 10:58 pm     Reply with quote
Use example Ex_Sisr.c to read characters serially into a buffer and then convert the string into a number using one of the following functions.

Code:

#include <stdlib.h>

ivalue = atoi(string)  // Returns 8 bit int  >> Max String Length = 3

lvalue = atol(string)  // Returns 16 bit value >> Max String Length = 5

i32value = atoi32(string)  // Returns 32 bit value  >> Max String Length = 9

SherpaDoug



Joined: 07 Sep 2003
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Location: Cape Cod Mass USA

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PostPosted: Fri Mar 07, 2008 9:23 am     Reply with quote
If the character contains a binary number, just cast the byte from one type to the other. Casting is a standard C term that any C book will cover.
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