main.c

这是一个mega128单片机通过spi口读写串口flash的程序

#include <iom128v.h>


void EEPROM_write(unsigned int uiAddress, unsigned char ucData)
{
/* Wait for completion of previous write */
while((EECR & (1<<EEWE)))
;
/* Set up address and data registers */
EEAR = uiAddress;
EEDR = ucData;
/* Write logical one to EEMWE */
EECR |= (1<<EEMWE);
/* Start eeprom write by setting EEWE */
EECR |= (1<<EEWE);
return;
}

unsigned char EEPROM_read(unsigned int uiAddress)
{
unsigned char temp;
/* Wait for completion of previous write */
while(EECR & (1<<EEWE))
;
/* Set up address register */
EEAR = uiAddress;
/* Start eeprom read by writing EERE */
EECR |= (1<<EERE);
/* Return data from data register */
temp = EEDR;
return temp;
}

void main(void)
{
 unsigned char w_char = 0x01,r_char = 0x00;
 unsigned int addr = 01;

 //EEPROM_write(1,w_char);
//while((EECR & (1<<EEWE)))
//;
/* Set up address and data registers */
//EEAR = addr;
//EEDR = w_char;
/* Write logical one to EEMWE */
//EECR |= (1<<EEMWE);
/* Start eeprom write by setting EEWE */
//EECR |= (1<<EEWE);

 //r_char = EEPROM_read(1);
while(EECR & (1<<EEWE))
;
/* Set up address register */
EEAR = addr;
/* Start eeprom read by writing EERE */
EECR |= (1<<EERE);
/* Return data from data register */
r_char = EEDR;

 while(1)
 {
  asm("nop");
 }

}