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deniska_gus
Joined: 11 Jul 2006
Posts: 42
Location: Minden, Germany
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| Strings and ex_sisr.c |
 Posted: Tue Apr 03, 2007 2:02 am |
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Hi all!
I have a question. I send a string from PC to PIC via rs232. It looks like "03.04.2007". It should be storaged in internal eeprom from PIC16F877A. Can i use this example (ex_sisr.c) to receive this string and write it to eeprom?
Thank you. Regards. Dennis |
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jecottrell
Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ
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| Posted: Tue Apr 03, 2007 8:11 am |
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Dennis,
Yes, the ex_sisr.c is a good starting point for what you are trying to do. When you send a string from the PC to your PIC you'll need to add a 'marker' to the end of the string to let the PIC know that, that is the end of the incoming string. Usually a CR or a LF is used.
Try doing a search for 'kbhit' in the forum and look at the code in the posts that are returned. You might find some good examples.
John |
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deniska_gus
Joined: 11 Jul 2006
Posts: 42
Location: Minden, Germany
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| Posted: Wed Apr 04, 2007 12:11 pm |
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Hallo all!
Here i made a interrupt service routine, that should read a string from rs232. But something is wrong, but what? My µC program should read a string, that i try to send from PC. It looks like "20.04.2007&", for example.
| Code: |
include <16F877a.h>
#fuses XT,NOWDT,PROTECT,PUT,BROWNOUT,NOLVP,NOWRT
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_c6, rcv=PIN_c7,parity=n,bits=8,ERRORS)
#use i2c(Master, sda=PIN_C4, scl=PIN_C3, SMBUS)
#include <stdlib.h>
#include <string.h>
#include <input.c>
#define BUFFER_SIZE 30
char buffer[BUFFER_SIZE];
char string[15];
BYTE next_in = 0;
#int_rda
void serial_isr()
{
buffer[next_in]=getc();
if(buffer[next_in] == '&')
{
buffer[next_in] = '\0';
strncpy(string, &buffer[next_in]-10, 10);
}
next_in=(next_in+1);
}
void main()
{
enable_interrupts(global);
enable_interrupts(int_rda);
while(1)
{
}
}
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