int ee.txt

pic 单片机的应用子程序库

/*=============================================================================
访问PIC16F877A片内EEPROM，运行程序：
        Begin Test    -> LED0亮，
        EEPROM Test OK-> LED7亮，
        Write&Read OK -> LED0/2/4/6亮。
=============================================================================*/
///////////////////////////////////////////////////////////////////////////////
// MPLAB IDE V7.11 + CCS C3.18
// Access 16F877A internal EEPROM for MCD2-demo
//
// by [e-mail]
// 2005/06/22
///////////////////////////////////////////////////////////////////////////////
#include <16F877A.h>                            // PIC16F877 header file
#use delay(clock=4000000)                       // for 4Mhz crystal
#fuses XT, NOWDT, NOPROTECT, NOLVP              // for debug mode


#define EEPROM_SIZE       256

////////////////////////////////////////////////////////////// eeprom_test()
//
int8 eeprom_test(void)
{
        int16 i;

        // write 0x55 test
        for(i=0; i<EEPROM_SIZE; ++i)
                {
                write_eeprom(i, 0x55);
                }
        for(i=0; i<EEPROM_SIZE; ++i)
                {
                if(0x55 != read_eeprom(i)) return 0;
                }

        // write 0xaa test
        for(i=0; i<EEPROM_SIZE; ++i)
                {
                write_eeprom(i, 0xaa);
                }
        for(i=0; i<EEPROM_SIZE; ++i)
                {
                if(0xaa != read_eeprom(i)) return 0;
                }

        // write 0
        for(i=0; i<EEPROM_SIZE; ++i)
                {
                write_eeprom(i, 0x00);
                }
        return 0xff;
}//end eeprom_test()

/*===========================================================================*/
void main(void)
{
        // begin test
        output_high(PIN_C0);

        // test internal eeprom
        if(0 != eeprom_test())
                {
                output_high(PIN_C7);
                delay_ms(1000);
                }

        // write 24c02
        write_eeprom(0, 0x55);

        // read 24c02
        output_c(read_eeprom(0));
}//end main()