请教关于PIC单片机写EEPROM上电默认值的问题

-4 · 2007-12-8 15:01

我用PIC单片机（内含EEPROM）做的产品，上电后第一件事是先从EEPROM中读出定值，我现在的做法是先把写EEPROM的子函数（写默认值）加到程序里，下载程序之后，上电运行，然后再把写EEPROM的子函数屏蔽掉，重新写程序。是否有简便的办法，好像汇编中可以直接写EEPROM的值，以后再重新上电就不会再重新EEPROM的值，请大虾指点下。

只看该作者 · 2007-12-8 15:12

1万 · 2007-12-9 19:51

int _EEDATA(2) USER_DATA[16] = {};
或：
int _EEDATA(2) USER_DATA[16] = {1,2,3};

只看该作者 · 2007-12-13 10:08

PICC中的写法：

// 0x00 - 0x0f
__EEPROM_DATA (0x55,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
// 0x10 - 0x1f
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
// 0x20 - 0x2f
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
// 0x30 - 0x3f
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
// 0x40 - 0x4f
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
// 0x50 - 0x5f
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
// 0x60 - 0x6f
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
__EEPROM_DATA (0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa,0xaa);
// 0x70 - 0x7f
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0x80 - 0x8f
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0x90 - 0x9f
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0xa0 - 0xaf
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0xb0 - 0xbf
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0xc0 - 0xcf
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0xd0 - 0xdf
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0xe0 - 0xef
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
// 0xf0 - 0xff
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);
__EEPROM_DATA (0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00);

汇编的写法：
    org    0x2100

; 0x00 - 0x0f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x10 - 0x1f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x20 - 0x2f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x30 - 0x3f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x40 - 0x4f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x50 - 0x5f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x60 - 0x6f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x70 - 0x7f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x80 - 0x8f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0x90 - 0x9f
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0xa0 - 0xaf
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0xb0 - 0xbf
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0xc0 - 0xcf
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0xd0 - 0xdf
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0xe0 - 0xef
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
; 0xf0 - 0xff
    de    0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00

只看该作者 · 2007-12-14 16:35

做个标志，上电时从eeprom读出标志：如果第一次使用，标志不正确，写默认值并且写标志；如果标志正确就读定值

-4 · 2007-12-15 10:03

谢谢各位大哥这么详细的指点，我现在采用4楼做法。

请教关于PIC单片机写EEPROM上电默认值的问题

直接用烧写器烧写EEPROM的内容,连写EEPROM的子函数都省了

可在EEPROM中预先定义一个数组

回复

做个标志嘛

谢谢各位大哥指点

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