Problems with the funktion putc()!

[lola]

After printing 17 times a charakter ( putc('I') ) my program is not able to get charakters correkty.
If i am printing only two times, it works correktly.

putc('H');
putc('E');
.
.
.
putc('O');

A = getc();
B = getc();
C = getc();
O = getc();

[PCM programmer]

Post a complete sample program that demonstrates the problem.
Post the #use rs232 statement, the #fuses statement, #use delay
statement, etc. (ie, the complete program).

Also post the type of PIC that you're using and the version of
the compiler.

[lola]

This program works very well until you remove the documentation in funktion BT_Inquire(void).
It seems to me that something in the write stack of the rs232 overwrites something in the read stack, or may be some flag is set.

headerfile:

#ifndef __SPIROMETER__
#define __SPIROMETER__

#include <16F76.h>
#device *=16
#use delay(clock=10000000)
#fuses NOWDT,HS,NOPUT,NOPROTECT,NOBROWNOUT
#use rs232(baud=14400,xmit=PIN_C6,rcv=PIN_C7)

#endif


C-file:

#include "76test2.h"

void BT_Inquire(void) //AT+BINQ=0,0,5,10\r\n
{
putc('A');
putc('T');

putc('+');
putc('B');
/*putc('I'); // if you remove the documentation
putc('N'); // the funktion GetAddress() will not work
putc('Q');
putc('=');
putc('0');
putc(',');
putc('0');
putc(',');
putc('5');
putc(',');
putc('1');
putc('0');
putc('\r');
putc('\n');*/
}

#inline
int GetAddress()
{
volatile char answe[29];
int wartezeit = 16;

timer_starten(); //TimeOut Timer Start

do {
if (kbhit()==0x01)
{
answe[0] = answe[1];
answe[1] = answe[2];
answe[2] = answe[3];
answe[3] = answe[4];
answe[4] = answe[5];
answe[5] = answe[6];
answe[6] = answe[7];
answe[7] = answe[8];
answe[8] = answe[9];
answe[9] = answe[10];
answe[10] = answe[11];
answe[11] = answe[12];
answe[12] = answe[13];
answe[13] = answe[14];
answe[14] = answe[15];
answe[15] = answe[16];
answe[16] = answe[17];
answe[17] = answe[18];
answe[18] = answe[19];
answe[19] = answe[20];
answe[20] = answe[21];
answe[21] = answe[22];
answe[22] = answe[23];
answe[23] = answe[24];
answe[24] = answe[25];
answe[25] = answe[26];
answe[26] = answe[27];
answe[27] = answe[28];
answe[28] = getc();
}

}while((sekunden < wartezeit) && !(answe[26]=='L' && answe[27]=='E' && answe[28]=='D'));

timer_stop();

if (sekunden == wartezeit)
{
return 0x00; //Timeout
}
else
{
return 0x01;
}


void main()
{

int Error = 0x00;
BT_Inquire();
BT_Inquire();
BT_Inquire(); //printf("AT+BINQ=0,0,5,10\r\n");
Error=GetAddress();
if (Error!=1)
Reset();
}

[Neutone]

It's kind of a side issue but you can use an entire string with puts(). It is actually documented in the compiler manual.

[Humberto]

I had similar issue when the modem generated a kind of glitches in the Tx line while I was transmiting.
Anyway I don�t see where you handle the UART interrupts.

Try with this: