NAND Flash
发布时间：2020-12-15 18:18:40 所属栏目：百科 来源：网络整理
导读：NAND Flash 参考链接：http://blog.csdn.net/angusing/article/details/8047155 ＳＤＲＡＭ.C 代码： #include common.h #define MEMCCMD 0x7e001004 #define P1REFRESH 0x7e001010 #define P1CASLAT 0x7e001014 #define MEM_SYS_CFG 0x7e00f120 #define P1M
NAND Flash
参考链接：http://blog.csdn.net/angusing/article/details/8047155
ＳＤＲＡＭ.C代码：
#include <common.h>
#define MEMCCMD 0x7e001004 #define P1REFRESH 0x7e001010 #define P1CASLAT 0x7e001014 #define MEM_SYS_CFG 0x7e00f120 #define P1MEMCFG 0x7e00100c #define P1T_DQSS 0x7e001018 #define P1T_MRD 0x7e00101c #define P1T_RAS 0x7e001020 #define P1T_RC 0x7e001024 #define P1T_RCD 0x7e001028 #define P1T_RFC 0x7e00102c #define P1T_RP 0x7e001030 #define P1T_RRD 0x7e001034 #define P1T_WR 0x7e001038 #define P1T_WTR 0x7e00103c #define P1T_XP 0x7e001040 #define P1T_XSR 0x7e001044 #define P1T_ESR 0x7e001048 #define P1MEMCFG2 0X7e00104c #define P1_chip_0_cfg 0x7e001200 #define P1MEMSTAT 0x7e001000 #define P1MEMCCMD 0x7e001004 #define P1DIRECTCMD 0x7e001008 #define HCLK 133000000 #define nstoclk(ns) (ns/( 1000000000/HCLK)+1) int ddr_init( void ) { // tell dramc to configure set_val( MEMCCMD,0x4 ); // set refresh period set_val( P1REFRESH,nstoclk(7800) ); // set timing para set_val( P1CASLAT,( 3 << 1 ) ); ? set_val( P1T_DQSS,0x1 );// 0.75 - 1.25 set_val( P1T_MRD,0x2 ); set_val( P1T_RAS,nstoclk(45) ); set_val( P1T_RC,nstoclk(68) ); u32 trcd = nstoclk( 23 ); set_val( P1T_RCD,trcd | (( trcd - 3 ) << 3 ) ); u32 trfc = nstoclk( 80 ); set_val( P1T_RFC,trfc | ( ( trfc-3 ) << 5 ) ); ?? u32 trp = nstoclk( 23 ); set_val( P1T_RP,trp | ( ( trp - 3 ) << 3 ) );? set_val( P1T_RRD,nstoclk(15) ); set_val( P1T_WR,nstoclk(15) ); set_val( P1T_WTR,0x7 ); set_val( P1T_XP,0x2 ); set_val( P1T_XSR,nstoclk(120) ); set_val( P1T_ESR,nstoclk(120) ); // set mem cfg? set_nbit( P1MEMCFG,3,0x2 ); ?/* 10 column address */ /* set_nbit: 把从第bit位开始的一共len位消零，然后把这几位设为val */ set_nbit( P1MEMCFG,0x2 ); ?/* 13 row address */ set_zero( P1MEMCFG,6 );?/* A10/AP */ set_nbit( P1MEMCFG,15,0x2 ); /* Burst 4 */ set_nbit( P1MEMCFG2,4,0x5 ); set_2bit( P1MEMCFG2,6,0x1 );/* 32 bit */ set_nbit( P1MEMCFG2,8,0x3 );/* Mobile DDR SDRAM */ set_2bit( P1MEMCFG2,11,0x1 ); set_one( P1_chip_0_cfg,16 );/* Bank-Row-Column organization */ // memory init set_val( P1DIRECTCMD,0xc0000 ); // NOP set_val( P1DIRECTCMD,0x000 );// precharge set_val( P1DIRECTCMD,0x40000 );// auto refresh set_val( P1DIRECTCMD,0xa0000 ); // EMRS set_val( P1DIRECTCMD,0x80032 ); // MRS set_val( MEM_SYS_CFG,0x0 ); // set dramc to "go" status set_val( P1MEMCCMD,0x000 ); // wait ready while( !(( read_val( P1MEMSTAT ) & 0x3 ) == 0x1)); } ＮＡＮＤ.C代码： #define MEM_SYS_CFG ? ? (*((volatile unsigned long *)0x7E00F120)) #define NFCONF ? ? ? ? ?(*((volatile unsigned long *)0x70200000)) #define NFCONT ? ? ? ? ?(*((volatile unsigned long *)0x70200004)) #define NFCMMD ? ? ? ? ?(*((volatile unsigned long *)0x70200008)) #define NFADDR ? ? ? ? ?(*((volatile unsigned long *)0x7020000C)) #define NFDATA ? ? ? ? ?(*((volatile unsigned char *)0x70200010)) #define NFSTAT ? ? ? ? ?(*((volatile unsigned long *)0x70200028)) void nand_select(void) { NFCONT &= ~(1<<1); } void nand_deselect(void) { NFCONT |= (1<<1); } void nand_cmd(unsigned char cmd) { NFCMMD = cmd; } void nand_addr(unsigned char addr) { NFADDR = addr; } unsigned char nand_get_data(void) { return NFDATA; } void wait_ready(void) { while ((NFSTAT & 0x1) == 0); } void nand_reset(void) { /* 选中 */ nand_select(); /* 发出0xff命令 */ nand_cmd(0xff); /* 等待就绪 */ wait_ready(); /* 取消选中 */ nand_deselect(); } void nand_init(void) { /* 让xm0csn2用作nand flash cs0 片选引脚 */ MEM_SYS_CFG &= ~(1<<1); /* 设置时间参数 */ #define TACLS ? ? 0 #define TWRPH0 ? ?1 #define TWRPH1 ? ?0 NFCONF &= ~((1<<30) | (7<<12) | (7<<8) | (7<<4)); NFCONF |= ((TACLS<<12) | (TWRPH0<<8) | (TWRPH1<<4)); /* 使能nand flash controller */ NFCONT |= 1; nand_reset(); } void nand_send_addr(unsigned int addr) { #if 0 unsigned int page = addr / 2048; /* 这两个地址表示从页内哪里开始 */ nand_addr(addr & 0xff); nand_addr((addr >> 8) & 0xff); /* 下面三个地址表示哪一页 */ nand_addr(page & 0xff); nand_addr((page >> 8) & 0xff); nand_addr((page >> 16) & 0xff); #else nand_addr(addr & 0xff); ? ? ? ? /* a0~a7 */ nand_addr((addr >> 8) & 0x7); ? /* 程序的角度: a8~a10 */ nand_addr((addr >> 11) & 0xff); /* 程序的角度: a11~a18 */ nand_addr((addr >> 19) & 0xff); /* 程序的角度: a19~a26 */ nand_addr((addr >> 27) & 0xff); /* 程序的角度: a27~ ? ?*/ #endif } int nand_read(unsigned int nand_start,unsigned int ddr_start,unsigned int len) { unsigned int addr = nand_start; int i,count = 0; unsigned char *dest = (unsigned char *)ddr_start; /* 选中芯片 */ nand_select(); while (count < len) { /* 发出命令0x00 */ nand_cmd(0x00); /* 发出地址 */ nand_send_addr(addr); /* 发出命令0x30 */ nand_cmd(0x30); /* 等待就绪 */ wait_ready(); /* 读数据 */ for (i = 0; i < 2048 && count < len; i++) { dest[count++] = nand_get_data(); } addr += 2048; } /* 取消片选 */ nand_deselect(); return 0; } int copy2ddr(unsigned int nand_start,unsigned int len) { int ret; /* 初始化nand flash controller */ nand_init(); /* 读nand flash */ ret = nand_read(nand_start,ddr_start,len); return ret; } （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |