LPC1788的内部EEPROM使用

Lpc1788内置有eeprom

使用代码

#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"

//有一些寄存器只能写不能读,用起来的时候要小心& |子类的应用,如果发生总线中断可能是这些因素引起的

//eeprom有一个64的页缓存,写入的时候不需要页地址只需要页偏移地址先写到这个页里面

//然后写入页地址,也缓存直接写入整个页面(应该是匹配 不同 写入)

void e2prom_init(void)

{

u32 val;

LPC_EEPROM->PWRDWN = 0x00;//清除掉电

LPC_EEPROM->CLKDIV = ((u16)(SystemCoreClock/EEPROM_CLOCK))-1;//设置时钟

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

val |= (((((SystemCoreClock / 1000000) * 55) / 1000) + 1) << 8);//设置等待时间 NS级别

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

LPC_EEPROM->WSTATE = val;

LPC_EEPROM->INT_CLR_STATUS = (1<<26)|(1<<28);//清除中断状态

//  LPC_EEPROM->INT_CLR_ENABLE = (1<<26)|(1<<28);//关闭中断

}

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

{

u16 dataddr = 0;

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

{

return 1;

}

dataddr = (addr&0x3f);

LPC_EEPROM->ADDR = dataddr;//写入地址

LPC_EEPROM->CMD = 3;//非连续八位写入

LPC_EEPROM->INT_CLR_STATUS = (1<<26)|(1<<28);//清除中断状态

LPC_EEPROM->WDATA = value;

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

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

return 0;

}

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

{

if(write_8(page,addr,value))return 1;

return e2prom_program(page);

}

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

{

u8 ret;

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

if(ret)return ret;

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

if(ret)return ret;

return e2prom_program(page);

}

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

{

u8 ret;

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

if(ret)return ret;

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

if(ret)return ret;

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

if(ret)return ret;

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

if(ret)return ret;

return e2prom_program(page);

}

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

{

u16 dataddr = 0;

LPC_EEPROM->INT_CLR_STATUS = (1<<26)|(1<<28);//清除中断状态

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

{

return 1;

}

dataddr = page;

dataddr<<=6;

dataddr |= (addr&0x3f);

LPC_EEPROM->ADDR = dataddr;//写入地址

LPC_EEPROM->CMD = 0;//非连续八位读出

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

*value = LPC_EEPROM->RDATA;

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

return 0;

}

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

{

u8 a,b,ret;

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

if(ret) return ret;

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

if(ret) return ret;

*value = a;

*value<<=8;

*value += b;

return 0;

}

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) return ret;

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

if(ret) return ret;

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

if(ret) return ret;

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

if(ret) return ret;

*value = a;

*value<<=8;

*value += b;

*value<<=8;

*value += c;

*value<<=8;

*value += d;

return 0;

}

u8 e2prom_program(u8 page)

{

u16 dataddr = 0;

LPC_EEPROM->INT_CLR_STATUS = (1 << 28);//清除编程中断

dataddr = (page&0x1f);

dataddr<<=6;

LPC_EEPROM->ADDR = dataddr;//写入地址

LPC_EEPROM->CMD = 6;//编程指令

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

return 0;

}

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 %2x\r\n",a);

printf("read b value is %2x\r\n",b);

printf("read c value is %2x\r\n",c);

printf("read d value is %2x\r\n",d);

e2prom_read_32(1,0,&read);

printf("read 32 value is %8x\r\n",read);

return 0;

}