need help in correcting errors urgently

weifeng · 02-08-2006, 08:07 PM

hi,

i m working on a DS1307 RTC program. i am using MPLAB IDE/C18 compiler. while trying to build the program, there are errors in it. can anyone help mi with the errors? i nid to get it done soon... the line in red is a syntax error...thanx

#define DS1307_SDA PIN_B1
#define DS1307_SCL PIN_B0
void boot_up(void);
void rtc_programming(void);
void read_rtc(void);

//==========================
// initial DS1307
//==========================
void init_DS1307()
{
output_float(DS1307_SCL);
output_float(DS1307_SDA);
}
//==========================
// write data one byte to
// DS1307
//==========================
void rtc_set(unsigned char rtcreg)
{
short int status;
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_write(data);
i2c_stop();
i2c_start();
status=i2c_write(0xd0);
while(status==1)
{
i2c_start();
status=i2c_write(0xd0);
}
}
//==========================
// read data one byte from DS1307
//==========================
byte read_DS1307(byte address)
{
byte data;
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_start();
i2c_write(0xd1);
data=i2c_read(0);
i2c_stop();
return(data);
}

freegianghu · 02-08-2006, 09:25 PM

Define byte type before using it

Code:

#define byte char

weifeng · 02-08-2006, 11:56 PM

hi,

but after putting that define line in, stil not successful. and this cums out:

MPLAB C18 v3.00 (demo)
Copyright 1999-2005 Microchip Technology Inc.
Days remaining until demo becomes feature limited: 12
C:\Documents and Settings\user\My Documents\feng.c:13:Error [1105] symbol 'PIN_B0' has not been defined
C:\Documents and Settings\user\My Documents\feng.c:13:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:14:Error [1105] symbol 'PIN_B1' has not been defined
C:\Documents and Settings\user\My Documents\feng.c:14:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:23:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:24:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:25:Error [1105] symbol 'address' has not been defined
C:\Documents and Settings\user\My Documents\feng.c:25:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:26:Error [1105] symbol 'data' has not been defined
C:\Documents and Settings\user\My Documents\feng.c:26:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:27:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:28:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:29:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:32:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:33:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:42:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:43:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:44:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:45:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:46:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:47:Warning [2058] call of function without prototype
C:\Documents and Settings\user\My Documents\feng.c:48:Warning [2058] call of function without prototype
Halting build on first failure as requested.
BUILD FAILED: Thu Feb 09 13:52:55 2006

Wim Sturkenboom · 02-09-2006, 12:54 AM

Quote:

C:\Documents and Settings\user\My Documents\feng.c:13:Error [1105] symbol 'PIN_B0' has not been defined

You still need to add an include that defines PIN_B0. Search in the provided include files for PIN_B0. Use a line in your code before you use PIN_B0 as shown below.

Code:

#include <file_that_i_found>
#define DS1307_SCL PIN_B0

Quote:

C:\Documents and Settings\user\My Documents\feng.c:25:Warning [2058] call of function without prototype

You use functions like output_float, i2c_start etc. I'm not sure if those are standard functions that come with the C-compiler or that you still have to write them. In the first case, do the same as above, in the second case do what you already did in your code

Code:

void boot_up(void);
void rtc_programming(void);
void read_rtc(void);
// add your prototypes here

Quote:

C:\Documents and Settings\user\My Documents\feng.c:25:Error [1105] symbol 'address' has not been defined

address and data are not defined in the following piece of code

Code:

void rtc_set(unsigned char rtcreg)
{
short int status;
i2c_start();
i2c_write(0xd0);
i2c_write(address);
i2c_write(data);

With the above hints, you should be able to compile it.

weifeng · 02-10-2006, 12:26 AM

hi,

thanx veri much for your help, i am actually very poor and slow in understanding programming.... i know your hints are useful, and shd b able to make it if i hav veri gd knowledge in programming... i juz duno hw to go abt correcting it... anyway, reali thx for helping.