Need Help with Long Int

[Eric Bauer]

Hello Everyone,

The following is a code snip from a project I'm working on. I hope someone can tell me why the printf statement in the main function reports that my long int 'x_delay' is some negative number like -3438 after I have expicitly set it to 62000??

Looking for help,

Eric

P.S. Using comiler PCM 2.734


///-----------------------------------------------------------------
// xy_table.c --
//
//
//
//--------------------------------------------------------------------------
// INCLUDE FILES

#include <16f876.H>

//---------------------------------------------------------------------------
// COMPILER AND CHIP CONFIGURATION DIRECTIVES

#fuses RC, NOWDT, NOPROTECT, NOBROWNOUT
#use Delay(Clock=4000000) // We're using a 4 MHz crystal
#use rs232(baud=2400, xmit=PIN_C6, rcv=PIN_C7) // Use built-in USART
#priority timer1,rda

//---------------------------------------------------------------------------
// DEFINITIONS

#define RECV_FIFO_SIZE 30


//---------------------------------------------------------------------------
// GLOBAL VARIABLES


char recv_fifo[RECV_FIFO_SIZE]; // Fifo for the RS-232 receive data isr
char *recv_fifo_head; // Pointers for the recv fifo
char *recv_fifo_tail;
char recv_fifo_byte_count; // Number of bytes in the recv fifo

// My Globals

char CmdArray[RECV_FIFO_SIZE]; // Array for storing commands from PC
int index=0; // Index of array storing serial commads B4 parsing

long x_dist=0; // X Axis Distance(steps)
long x_delay=62000; // X Axis Step Delay--Delay between steps

//---------------------------------------------------------------------------
// FUNCTION DECLARATIONS

void init_rs232_recv_buffer(void);
char get_rs232_char(void);
char is_rs232_char_ready(void);
void rs232_recv_data_isr(void);

void move_x(void); //ISR for X Axis step code

long ConvertToLong(*string,len); //Converts ascii number to long int
int ConvertToInt(*string,len); //Convert ascii number to int

//====================== Main Function ================================================


void main(void)
{

char value;

printf("Delay at Start=\%ld\n\r",x_delay);

init_rs232_recv_buffer(); // Init pointers to recv fifo

setup_timer_1(T1_Internal|T1_DIV_BY_1);
set_timer1(x_delay);
//enable_interrupts(INT_TIMER1); //will interrupt processor and run code to step motor


while(1)
{
if(is_rs232_char_ready() == TRUE) // Did we receive an RS-232 char ?
{
value = get_rs232_char(); // If so, get the byte
putc(value); // echo it back to host
}

}
___________________________
This message was ported from CCS's old forum
Original Post ID: 552

[Richard Henry]

Try unsigned long.


:=Hello Everyone,
:=
:=The following is a code snip from a project I'm working on. I hope someone can tell me why the printf statement in the main function reports that my long int 'x_delay' is some negative number like -3438 after I have expicitly set it to 62000??
___________________________
This message was ported from CCS's old forum
Original Post ID: 553

[DominicB]

Try using \%lu instead of \%ld, 'd' stands for signed int while 'u' is unsigned.

Best regards


:=Hello Everyone,
:=
:=The following is a code snip from a project I'm working on. I hope someone can tell me why the printf statement in the main function reports that my long int 'x_delay' is some negative number like -3438 after I have expicitly set it to 62000??
:=
:=Looking for help,
:=
:=Eric
:=
:=P.S. Using comiler PCM 2.734
:=
:=
:=///-----------------------------------------------------------------
:=// xy_table.c --
:=//
:=//
:=//
:=//--------------------------------------------------------------------------
:=// INCLUDE FILES
:=
:=#include <16f876.H>
:=
:=//---------------------------------------------------------------------------
:=// COMPILER AND CHIP CONFIGURATION DIRECTIVES
:=
:=#fuses RC, NOWDT, NOPROTECT, NOBROWNOUT
:=#use Delay(Clock=4000000) // We're using a 4 MHz crystal
:=#use rs232(baud=2400, xmit=PIN_C6, rcv=PIN_C7) // Use built-in USART
:=#priority timer1,rda
:=
:=//---------------------------------------------------------------------------
:=// DEFINITIONS
:=
:=#define RECV_FIFO_SIZE 30
:=
:=
:=//---------------------------------------------------------------------------
:=// GLOBAL VARIABLES
:=
:=
:=char recv_fifo[RECV_FIFO_SIZE]; // Fifo for the RS-232 receive data isr
:=char *recv_fifo_head; // Pointers for the recv fifo
:=char *recv_fifo_tail;
:=char recv_fifo_byte_count; // Number of bytes in the recv fifo
:=
:=// My Globals
:=
:=char CmdArray[RECV_FIFO_SIZE]; // Array for storing commands from PC
:=int index=0; // Index of array storing serial commads B4 parsing
:=
:=long x_dist=0; // X Axis Distance(steps)
:=long x_delay=62000; // X Axis Step Delay--Delay between steps
:=
:=//---------------------------------------------------------------------------
:=// FUNCTION DECLARATIONS
:=
:=void init_rs232_recv_buffer(void);
:=char get_rs232_char(void);
:=char is_rs232_char_ready(void);
:=void rs232_recv_data_isr(void);
:=
:=void move_x(void); //ISR for X Axis step code
:=
:=long ConvertToLong(*string,len); //Converts ascii number to long int
:=int ConvertToInt(*string,len); //Convert ascii number to int
:=
:=//====================== Main Function ================================================
:=
:=
:=void main(void)
:={
:=
:=char value;
:=
:=printf("Delay at Start=\%ld\n\r",x_delay);
:=
:=init_rs232_recv_buffer(); // Init pointers to recv fifo
:=
:=setup_timer_1(T1_Internal|T1_DIV_BY_1);
:=set_timer1(x_delay);
:=//enable_interrupts(INT_TIMER1); //will interrupt processor and run code to step motor
:=
:=
:=while(1)
:= {
:= if(is_rs232_char_ready() == TRUE) // Did we receive an RS-232 char ?
:= {
:= value = get_rs232_char(); // If so, get the byte
:= putc(value); // echo it back to host
:= }
:=
:=}
___________________________
This message was ported from CCS's old forum
Original Post ID: 554