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[SOLVED] Problem building a program in MPLAB

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panos_papajohn

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Hello

Im writing a super simple program cause I want to learn how to use my PICkit3.Im using MPLAB v8.6 and MCC18 compiler.
Code: 
#include <p18f1230.h> 
#include <stdio.h> 

#pragma config WDT = OFF 

void main (void) 
{ 
printf ("Hello, world!\n"); 
while (1) 
; 
}

(I know that this code doesn't do anything if it is programed to a PIC)
When I built my project I get the following error :

Error - section '.romdata_vfprintf.o' can not fit the section. Section '.romdata_vfprintf.o' length=0x00000011

What is that??? Have I done anything wrong? I followed the instructions on how to create a project in MPLAB. The only thing that I omitted was the linker script because I read that in the new version it is added automatically. Is it a problem with the program memory of the PIC (I use PIC18F1230)?
Bare in mind that yesterday I was using the same program and compiler, to test the USART interface and everything worked just fine.:? Any ideas?

Thanks in advance
Panos
 

I have used printf() OK on a PIC18F97J60 which has 128K of program memory
however, the device you are using, the PIC18F1230, only has 4K of program memory.
printf() is a complex function so is probably too large to fit into 4K
 

Yes I 've already figured that out.:-D I want to use UART communication between an UMTS module so I have to send AT commands . Would this be a problem for the memory. I was thinking of allocating a buffer memory and then clear the buffer after the usage . Do you think this is possible horace1?

Thank you for your reply
 

AT commands tend to be just text strings so implement a simple function to write a string to sind to the USART
e.g. something along the lines of
Code: 
// return true if transmitter busy
char BusyUSART(void)
{
	return !TXSTAbits.TRMT;
}

// write to USART
void WriteUSART(char data)
{
  while(BusyUSART());	// wait for transmitter ready
  TXREG = data;      	// Write the data byte to the USART
}

// write string to transmitter
void putsUSART( char *data)
{
  do
  {  // Transmit a byte
    while(BusyUSART());
    WriteUSART(*data);
  } while( *data++ );
}

void putrsUSART(const rom char *data)
{
  do
  {  // Transmit a byte
    while(BusyUSART());
   WriteUSART(*data);
  } while( *data++ );
}
 

Yes I know the way to do it but the thing is that I want to use several AT commands for the activation of the device, setting the baudrate, query of the network status etc.. I tried the #define statement but I couldn't define more than one strings at the same time because the compiler had a problem with the memory. So I was thinking about allocating a buffer from the memory to send one AT command, and when I want to send another command I'll just have to empty the buffer and load the new command. Is that possible in PICs?
 

if you have a sequence of at commands to send why not do something like
Code: 
putrsUSART("at");
putrsUSART("at+csq");
putrsUSART("at+cmgf=1");
clearly after sending each at command you need to check the reply for OK or ERROR, etc
 

:-D Yes of course, it didn't even cross my mind. Thank you very much horace1
 

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