S3C2440-Nandflash

作者：時(shí)間：2016-12-02 來源：網(wǎng)絡(luò)

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void NF_Init(){

//GPA 17～22接在nandflash上

rGPACON = rGPACON & ("(0x3f＜＜17)) | (0x3f＜＜17);

//TACLS為CLE/ALE有效到nWE有效之間的持續(xù)時(shí)間，TWRPH0為nWE的有效持續(xù)時(shí)間，TWRPH1為nWE無效到CLE/ALE無效之間的持續(xù)時(shí)間，這些時(shí)間都是以HCLK為單位的（本文程序中的HCLK=100MHz）

rNFCONF = (TACLS＜＜12)|(TWRPH0＜＜8)|(TWRPH1＜＜4)|(0＜＜0);

//非鎖定，屏蔽nandflash中斷，初始化ECC及鎖定main區(qū)和spare區(qū)ECC，使能nandflash片選及控制器

rNFCONT = (0＜＜13)|(0＜＜12)|(1＜＜6)|(1＜＜5)|(1＜＜4)|(1＜＜1)|(1＜＜0);

}

void NF_Reset(){

NF_CE_L();

NF_WAITRB();

NF_CMMD(CMD_RESET);

NF_DETECT();

NF_CE_H();

}

void NF_ReadID(){

char MID, DID, cyc3, cyc4, cyc5;

NF_CE_L();

NF_CLEARRB();

NF_CMMD(CMD_READID);

NF_ADDR(0x00);

MID = NF_RDDATA8(); //廠商ID

while(!(rUTRSTAT0&0x4));

rUTXH0 = MID;

DID = NF_RDDATA8(); //設(shè)備ID

while(!(rUTRSTAT0&0x4));

rUTXH0 = DID;

cyc3 = NF_RDDATA8(); //其他信息

while(!(rUTRSTAT0&0x4));

rUTXH0 = cyc3;

cyc4 = NF_RDDATA8();

while(!(rUTRSTAT0&0x4));

rUTXH0 = cyc4;

cyc5 = NF_RDDATA8();

while(!(rUTRSTAT0&0x4));

rUTXH0 = cyc5;

NF_CE_H();

}

U8 NF_RandomWrite(U32 pagenumber, U32 add, U8 data){ //根據(jù)時(shí)序來就行

U8 state;

NF_CE_L();

NF_CMMD(CMD_WRITE1);

NF_ADDR(0x00);

NF_ADDR(pagenumber&0xff);

NF_ADDR((pagenumber＞＞8)&0xff);

NF_ADDR((pagenumber＞＞16)&0xff);

NF_CMMD(CMD_RANDOMWRITE);

NF_ADDR(add&0xff); //確定頁內(nèi)地址

NF_ADDR((add＞＞8)&0xff);

NF_WRDATA8(data); //寫數(shù)據(jù)

NF_CMMD(CMD_WRITE2);

NF_WAITRB();

NF_CMMD(CMD_READSTATE);

do{

state = NF_RDDATA8();

}while(!(state&0x40));

if(state&0x1){

while(!(rUTRSTAT0&0x4));

rUTXH0 = 0x44;

return 0x44; //0x44隨機(jī)寫失敗

}

else{

while(!(rUTRSTAT0&0x4));

rUTXH0 = 0x66;

return 0x66; //0x66隨機(jī)寫成功

}

U8 NF_RandomRead(U32 pagenumber, U32 add){ //根據(jù)時(shí)序來就行

char ch;

NF_CE_L();

NF_CMMD(CMD_READ1);

NF_ADDR(0x00);

NF_ADDR(pagenumber&0xff);

NF_ADDR((pagenumber＞＞8)&0xff);

NF_ADDR((pagenumber＞＞16)&0xff);

NF_CMMD(CMD_READ2);

NF_WAITRB();

NF_CMMD(CMD_RANDOMREAD1);

NF_ADDR(add&0xff);

NF_ADDR((add＞＞8)&0xff);

NF_CMMD(CMD_RANDOMREAD2);

ch = NF_RDDATA8(); //讀數(shù)據(jù)

while(!(rUTRSTAT0&0x4));

rUTXH0 = ch;

NF_CE_H();

return ch;

}

U8 NF_IsBadBlock(U32 block){

U8 result;

result = NF_RandomRead(block*64, 2054); //0"2047是main區(qū)數(shù)據(jù),2048"2051是main區(qū)的ECC校驗(yàn),2052"2053是spare區(qū)的ECC校驗(yàn)

if(result == 0x33){

while(!(rUTRSTAT0&0x4));

rUTXH0 = 0x62;

return 0x62; //0x62是壞塊

}

else{

while(!(rUTRSTAT0&0x4));

rUTXH0 = 0x42;

return 0x42; //0x42不是壞塊

}

U8 NF_MarkBadblock(U32 block){

U8 result;

result = NF_RandomWrite(block*64, 2054, 0x33); //0x33標(biāo)記壞塊 block*64得到的是block塊第一個(gè)頁的地址

if(result == 0x66){

while(!(rUTRSTAT0&0x4));

rUTXH0 = 0x61;

return 0x61; //0x61標(biāo)記壞塊成功

}

else{

while(!(rUTRSTAT0&0x4));

rUTXH0 = 0x41;

return 0x41; //0x41標(biāo)記壞塊失敗

}

void __irq UART0_ISR(void){

U8 ch;

rSRCPND |= (0x1＜＜28);

rINTPND |= (0x1＜＜28);

rSUBSRCPND |= 0x1＜＜0;

if(rUTRSTAT0 & 0x1){

ch = rURXH0;

while(!(rUTRSTAT0&0x4));

rUTXH0 = ch;

cmd = ch;

}

int Main(){

count = 0;

rULCON0 = 0x3;

rUCON0 = (1＜＜11)|(1＜＜2)|(1＜＜0);

rUBRDIV0 = 26;

rSRCPND = 0x1＜＜28;

rINTPND = 0x1＜＜28;

rSUBSRCPND = 0x1＜＜0;

rINTMSK &= "(0x1＜＜28);

rINTSUBMSK &= "(0x1＜＜0);

pISR_UART0 = (U32)UART0_ISR;

NF_Init();

while(1){

switch(cmd){

case 0x11:

NF_Reset();

break;

case 0x22:

NF_ReadID();

break;

case 0x33:

NF_RandomRead(2001*64,0x3);

break;

case 0x44:

NF_RandomWrite(2001*64,2052,0xbc);

break;

case 0x55:

NF_PageRead(2001*64);

break;

case 0x66:

while(!(rUTRSTAT0&0x4));

rUTXH0 = 0xba;

NF_PageWrite(2001*64);

break;

case 0x77:

NF_BlockErase(2001);

break;

case 0x88:

NF_IsBadBlock(2001);

break;

case 0x99:

NF_MarkBadblock(2001);

break;

}

cmd = 0;

}

return 0;

}

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