给ICC C编程软件自带函数库搞晕！好垃圾的写EEPROM子程序！
写EEPROM子程序
自带函数库：
int EEPROMwrite( int location, unsigned char byte)
{
unsigned char oldSREG;
EEAR = location;
EEDR = byte;
oldSREG = SREG;
SREG &= ~0x80; // disable interrupt, 这里看出在整个写过程中中断都是禁止的，EEPROM的编程时间是8448个周期。在这么长时间内禁止中断，什么中断实时处理都废了。
EECR |= 0x04; // Set MASTER WRITE enable
EECR |= 0x02; // Set WRITE strobe
while (EECR & 0x02); // Wait until write is done
SREG = oldSREG;
return 0; // return Success.
// Could be expanded so that
// the routine checks that the address
// is within the range of the chip.
}
修改后的程序：
int EEPROMwrite( int location, unsigned char byte)
{
EEAR = location;
EEDR = byte;
CLI();
EECR |= (1<<EEMWE); // Set MASTER WRITE enable
EECR |= (1<<EEWE); // Set MASTER WRITE enable
SEI();
while (EECR & (1<<EEWE)); // Wait until write is done
return 0; // return Success.
// Could be expanded so that
// the routine checks that the address
// is within the range of the chip.
} |
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