Getting Unknown variable error while compiling c to hex
The following code is for gps gsm module.The compiled hex code is pushed to microprocessor.
While compiling the below code we get unknown variable error for following variables UCZS0, UCZS1
Please guide us for same.
While compiling the below code we get unknown variable error for following variables UCZS0, UCZS1
Please guide us for same.
//GPS and GSM Based Vehicle tracking system
#define F_CPU 12000000 //12Mhz
#include <avr/io.h> //Header file for AVR device specific I/O Definitions.
#include <avr/pgmspace.h> //Header file for incorporating program space string utilities.
#include <util/delay.h> //Header file for incorporating delay routines.
#include<inttypes.h>
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
void WaitMs(unsigned int ms);
void usart_init();
unsigned int usart_getch();
void usart_writech(unsigned char data);
void usart_message(unsigned char *var);
unsigned char value,i,lati_value[9],lati_dir, longi_value[10], longi_dir, final_message[30];
unsigned char deg = 0xB0;
int main()
{
DDRC=0x00;
PORTC=0xff;
usart_init();
while(1)
{
a:
value=usart_getch();
if(value=='$')
{
value=usart_getch();
if(value=='G')
{
value=usart_getch();
if(value=='P')
{
value=usart_getch();
if(value=='G')
{
value=usart_getch();
if(value=='A')
{
value=usart_getch();
if(value==',')
{
value=usart_getch();
while(value!=',')
{
value=usart_getch();
}
for(i=0; i<9; i++)
{
lati_value[i] = usart_getch();
}
value = usart_getch();
lati_dir=usart_getch();
value=usart_getch();
for(i=0; i<10; i++)
{
longi_value[i] = usart_getch();
}
value = usart_getch();
for(i=1;value!=',';i++)
{
longi_value[i]=usart_getch();
value=longi_value[i];
}
longi_dir=usart_getch();
}
}
}
}
}
}
if(*lati_value && *longi_value)
{
for(i=0; i<9; i++)
{
final_message[i] = lati_value[i];
}
final_message[9] = lati_dir;
final_message[10] = ' ';
for(i=0; i<10; i++)
{
final_message[i+11] = longi_value[i];
}
final_message[21] = longi_dir;
final_message[22] = '\0';
}
else
goto a;
while(PINC==0xff);
WaitMs(1000);
usart_message("ATH");
WaitMs(50);
usart_message("AT+CMGF=1");
usart_writech(0x0D);
WaitMs(20);
WaitMs(20);
usart_message("AT+CMGS=\"+918907607614\"");
usart_writech(0x0D);
usart_message(final_message);//message
usart_writech(0x1A);
WaitMs(10000);
goto a;
}
return 0;
}
void WaitMs(unsigned int ms)
{
unsigned int i;
for(i=0;i<=ms;i++)
{
_delay_ms(1);
}
}
void usart_init()
{
UCSRB = (1 << RXEN) | (1 << TXEN);
// Use 8-bit character sizes
UCSRC |= (1 << URSEL) | (1 << UCZS0) | (1 << UCZS1);
// Load lower 8-bits of the baud rate value into the low byte of the UBRR register
UBRRL = BAUD_PRESCALE;
UBRRH = (BAUD_PRESCALE >> 8);
}
unsigned int usart_getch()
{
while (!(UCSRA & (1 << RXC)));
return(UDR);
}
void usart_writech(unsigned char data)
{
while(!(UCSRA & (1<<UDRE)));
UDR = data;
}
void usart_message(unsigned char *var)
{
int h;
while(*var)
usart_writech(var++); // send message
for(h=0;h<=200;h++);
}
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we get unknown variable error for following variables UCZS0, UCZS1
is there still an error if you add statements
#define UCZS0 0
#define UCZS1 1
below include statements? if yes, you should search all header files for a definition of those constants and include the header file if you found one.
while (!(UCSRA & (1 << RXC)));
how do you want to break from this loop if the condition is true? neither UCSRA nor RXC will change in that loop.
if the UCSRA and/or RXC are shared variables which might be modified in a second thread, you might need the volatile keyword for the definition in order that the compiler adds statements to recognize such changes. anyway, the loop is bad programming and may push one core of your cpu's to 100 %.
you have same kind of loop a multiple time.
Sara
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Where are these variables defined? in one of the #includes ????
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