Lpc1788內(nèi)置有eeprom

使用代碼

#ifndef __E2PRONINCHIP_H_

#define __E2PROMINCHIP_H

#include "common.h"

#include "sys.h"

#include "debugserial.h"

#define EEPROM_CLOCK 375000

void e2prom_init(void);

u8 e2prom_write_8(u8 page,u8 addr,u8 value);

u8 e2prom_write_16(u8 page,u8 addr,u16 value);

u8 e2prom_write_32(u8 page,u8 addr,u32 value);

u8 e2prom_read_8(u8 page,u8 addr,u8*value);

u8 e2prom_read_16(u8 page,u8 addr,u16*value);

u8 e2prom_read_32(u8 page,u8 addr,u32*value);

u8 e2prom_program(u8 page);

u8 e2prom_test(void);

#endif

#include "e2prominchip.h"

//有一些寄存器只能寫不能讀,用起來的時(shí)候要小心& "子類的應(yīng)用,如果發(fā)生總線中斷可能是這些因素引起的

//eeprom有一個(gè)64的頁緩存,寫入的時(shí)候不需要頁地址只需要頁偏移地址先寫到這個(gè)頁里面

//然后寫入頁地址,也緩存直接寫入整個(gè)頁面(應(yīng)該是匹配 不同 寫入)

void e2prom_init(void)

{

u32 val;

LPC_EEPROM->PWRDWN=0x00;//清除掉電

LPC_EEPROM->CLKDIV=((u16)(SystemCoreClock/EEPROM_CLOCK))-1;//設(shè)置時(shí)鐘

val=((((SystemCoreClock/1000000)*15)/1000)+1);

val|=(((((SystemCoreClock/1000000)*55)/1000)+1)<<8);//設(shè)置等待時(shí)間 NS級別

val|=(((((SystemCoreClock/1000000)*35)/1000)+1)<<16);

LPC_EEPROM->WSTATE=val;

LPC_EEPROM->INT_CLR_STATUS=(1<<26)|(1<<28);//清除中斷狀態(tài)

// LPC_EEPROM->INT_CLR_ENABLE = (1<<26)|(1<<28);//關(guān)閉中斷

}

static u8 write_8(u8 page,u8 addr,u8 value)

{

u16 dataddr=0;

if(page>=64||addr>=64)

{

return1;

}

dataddr=(addr&0x3f);

LPC_EEPROM->ADDR=dataddr;//寫入地址

LPC_EEPROM->CMD=3;//非連續(xù)八位寫入

LPC_EEPROM->INT_CLR_STATUS=(1<<26)|(1<<28);//清除中斷狀態(tài)

LPC_EEPROM->WDATA=value;

while(!(LPC_EEPROM->INT_STATUS&(1<<26)));//等待寫入完成

LPC_EEPROM->INT_CLR_STATUS=(1<<26);//清除

return0;

}

u8 e2prom_write_8(u8 page,u8 addr,u8 value)

{

if(write_8(page,addr,value))return1;

returne2prom_program(page);

}

u8 e2prom_write_16(u8 page,u8 addr,u16 value)

{

u8 ret;

ret=write_8(page,addr,(u8)(value>>8));

if(ret)returnret;

ret=write_8(page,addr+1,(u8)value);

if(ret)returnret;

returne2prom_program(page);

}

u8 e2prom_write_32(u8 page,u8 addr,u32 value)

{

u8 ret;

ret=write_8(page,addr,(u8)(value>>24));

if(ret)returnret;

ret=write_8(page,addr+1,(u8)(value>>16));

if(ret)returnret;

ret=write_8(page,addr+2,(u8)(value>>8));

if(ret)returnret;

ret=write_8(page,addr+3,(u8)value);

if(ret)returnret;

returne2prom_program(page);

}

u8 e2prom_read_8(u8 page,u8 addr,u8*value)

{

u16 dataddr=0;

LPC_EEPROM->INT_CLR_STATUS=(1<<26)|(1<<28);//清除中斷狀態(tài)

if(page>=64||addr>=64)

{

return1;

}

dataddr=page;

dataddr<<=6;

dataddr|=(addr&0x3f);

LPC_EEPROM->ADDR=dataddr;//寫入地址

LPC_EEPROM->CMD=0;//非連續(xù)八位讀出

while(!(LPC_EEPROM->INT_STATUS&(1<<26)));//等待讀出完成

*value=LPC_EEPROM->RDATA;

LPC_EEPROM->INT_CLR_STATUS=(1<<26);//清除

return0;

}

u8 e2prom_read_16(u8 page,u8 addr,u16*value)

{

u8 a,b,ret;

ret=e2prom_read_8(page,addr,&a);

if(ret)returnret;

ret=e2prom_read_8(page,addr+1,&b);

if(ret)returnret;

*value=a;

*value<<=8;

*value+=b;

return0;

}

u8 e2prom_read_32(u8 page,u8 addr,u32*value)

{

u8 a,b,c,d,ret;

ret=e2prom_read_8(page,addr,&a);

if(ret)returnret;

ret=e2prom_read_8(page,addr+1,&b);

if(ret)returnret;

ret=e2prom_read_8(page,addr+2,&c);

if(ret)returnret;

ret=e2prom_read_8(page,addr+3,&d);

if(ret)returnret;

*value=a;

*value<<=8;

*value+=b;

*value<<=8;

*value+=c;

*value<<=8;

*value+=d;

return0;

}

u8 e2prom_program(u8 page)

{

u16 dataddr=0;

LPC_EEPROM->INT_CLR_STATUS=(1<<28);//清除編程中斷

dataddr=(page&0x1f);

dataddr<<=6;

LPC_EEPROM->ADDR=dataddr;//寫入地址

LPC_EEPROM->CMD=6;//編程指令

while(!(LPC_EEPROM->INT_STATUS&(1<<28)));

return0;

}

u8 e2prom_test(void)

{

u8 a,b,c,d;

u32 read;

e2prom_write_32(1,0,0xaabbccdd);

e2prom_read_8(1,0,&a);

e2prom_read_8(1,1,&b);

e2prom_read_8(1,2,&c);

e2prom_read_8(1,3,&d);

printf("read a value is %2xrn",a);

printf("read b value is %2xrn",b);

printf("read c value is %2xrn",c);

printf("read d value is %2xrn",d);

e2prom_read_32(1,0,&read);

printf("read 32 value is %8xrn",read);

return0;

}