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Problems with function definitions

 
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Alejandro



Joined: 25 Mar 2011
Posts: 7

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Problems with function definitions
PostPosted: Mon May 23, 2011 4:42 pm     Reply with quote
Hi. I'm defining a function as follows, when I compile the program I not have errors,
Code:

int Modem_Wait_Rpta(char Buffer_TX,char Buffer_RX,int Nro_char) {

printf(Buffer_TX);                 // Mensaje a ser enviado al Modem
delay_ms(2000);

if (flag_RX_Modem){                // Hay datos en el UART
    sprintf(Token,Buffer_RX);      // Mensaje esperado del modem
    if(!strncmp(Buffer_Modem,Token,Nro_char))
       return 1;
    else
       return 0;
  }
else
  return 0;
}

.
.
.
but when I call the function ...
Code:
while (Modem_Wait_Rpta("AT+SBD","+SBDI:1",9));


the compiler gives me the following error
Quote:
*** Error 90 "Modem_4x.c" Line 428(37,38): Attempt to create a pointer to a constant


Someone could tell me what my error and how to fix this.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon May 23, 2011 5:27 pm     Reply with quote
To fix the error message, add the #device statement shown in bold below:
Quote:

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



Also, you are passing char pointers as your function parameters. So the
parameters should be declared as char pointers, as shown below in bold.
Quote:

int Modem_Wait_Rpta(char *Buffer_TX, char *Buffer_RX, int Nro_char)
{
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