ads调试2410，从nandflash读数据，读出的全部是零，大侠指导呀

只看该作者 · 2007-4-3 10:45

我按vivi写的，一段汇编程序初始化2410板子，然后将nandflash（k9f1208）上128k数据复制到sram中，读的程序用vivi带的nand_read_ll函数，可是读出的数据全是零，望大侠指导，我将相关程序贴出

1万 · 2007-4-3 10:50

只看该作者 · 2007-4-3 11:12

btiger2000您说的id是什么呢？

我将详细的相关程序贴在下面

；reset nand
>    ldr r1,=0x4E000000       ;NFCONF
>    ldr r2,=0xf830           ;TWRPH0=3,TACLS=0,NAND CHIP INACTIVE,INITIALIZE ECC
>    str r2,[r1]
>    ldr r2,[r1]
>    bic r2,r2,#0x800        ;NAND CHIP ACTIVE,ENABLE NAND FLASH CONTROLER
>    str r2,[r1]
>    mov r2,#0xff
>    strb r2,[r1,#0x04]    ;NFCMD
>    mov r3,#0
>1      add r3,r3,#0x1
>    cmp r3,#0xa
>    blt %b1
>2      ldr r2,[r1,#0x10]       ;NFSTAT
>    TST r2,#0X1
>    beq %b2
>    ldr r2,[r1]
>    orr r2,r2,#0x800        ;disable chip
>    str r2,[r1]
>
>
>    ldr sp,=0x33df6ffb      ;DW_STACK_START ******  setup stack pionter
>    mov fp,#0
>
>    ldr r0,=0x33f00000       ;VIVI_RAM_BASE
>    mov r1,#0x0
>    mov r2,#0x20000         ;要拷贝128k
>；*******************************************************************************
>
>
>    bl nand_read_ll         ;nand_read_ll函数将nand的从0地址处开始的128k的内
>
>
>容读到 ram的指定处
下面是nand_read_ll函数：

#define NFCONF        (*(volatile unsigned char *)0x4e000000)
>#define NFCMD        (*(volatile unsigned char *)0x4e000004)
>#define NFADDR        (*(volatile unsigned char *)0x4e000008)
>#define NFDATA        (*(volatile unsigned char *)0x4e00000c)
>#define NFSTAT        (*(volatile unsigned char *)0x4e000010)
>#define BUSY 1
> void wait_idle(void) {
>    int i;
>
>    while(!(NFSTAT & BUSY))
>      for(i=0; i<10; i++);
>}
>
>#define NAND_SECTOR_SIZE    512
>#define NAND_BLOCK_MASK        (NAND_SECTOR_SIZE - 1)
>
>/* low level nand read function */
>int nand_read_ll(unsigned int *buf, unsigned long start_addr, int size)
>{                     //(0x33f00000,#0x0,#0x20000)
>    int i, j;
>
>    if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK))
>     {
>        return -1;    /* invalid alignment */
>    }
>
>    /* chip Enable */
>    NFCONF &= ~0x800;
>    for(i=0; i<10; i++);
>
>    for(i=start_addr; i < (start_addr + size);) {
>      /* READ0 */
>      NFCMD = 0;
>
>      /* Write Address */
>      NFADDR = i & 0xff;
>      NFADDR = (i >> 9) & 0xff;
>      NFADDR = (i >> 17) & 0xff;
>      NFADDR = (i >> 25) & 0xff;
>
>      wait_idle();
>
>      for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {
>    *buf = (NFDATA & 0xff);
>    buf++;
>      }
>    }
>
>    /* chip Disable */
>    NFCONF |= 0x800;    /* chip disable */
>
>    return 0;
>
>}