FLOAT / 24LC256

[Orcino]

Hi, this a lsmall code for test a var FLOAT with the 24LC256. I write

19.508016 and read 19.508018 Somebody can help me ?


#include <18F452.h>
#fuses HS,NOWDT,NOPUT,NOLVP,NOBROWNOUT,NOCPD,NOWRT
#use delay(clock=20000000)

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#include <24256>

float lat1=19.508016;

WRITE_FLOAT_EXT_EEPROM(long int n, float data);

float READ_FLOAT_EXT_EEPROM(long int n);

float leitura;

long int end=20;

INT8 CONT=0;

//***********************************************************
// Função principal
//***********************************************************

void main()
{


init_ext_eeprom();

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_wdt(WDT_OFF);
setup_timer_0(RTCC_INTERNAL);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
// setup_comparator(NC_NC_NC_NC);
// setup_vref(VREF_LOW|-2);
// setup_low_volt_detect(FALSE);
// setup_oscillator(False);

ext_int_edge(2,H_TO_L);
// enable_interrupts(INT_EXT2);
// enable_interrupts(GLOBAL);


while (1)

{


IF(CONT < 7 )

{

WRITE_FLOAT_EXT_EEPROM(end,lat1);

delay_ms(500);

leitura = READ_FLOAT_EXT_EEPROM(end);

printf("Dado e %f\n\r",leitura);
CONT++;

}
}
}


//***********************************************************
//***********************************************************


WRITE_FLOAT_EXT_EEPROM(long int n, float data)

{
int i;

for (i = 0; i < 4; i++)
write_ext_eeprom(i + n, *(&data + i) ) ;

}


float READ_FLOAT_EXT_EEPROM(long int n)

{
int i;
float data;

for (i = 0; i < 4; i++)
*(&data + i) = read_ext_eeprom(i + n);

return(data);
}

//***********************************************************


Thanks

Orcino

[hfelton]