Nand Flash

#define NFDATA_READ *(volatile unsigned char*)0x70200010

字节读写

#define NFDATA_READ *(volatile unsigned int*)0x70200010

字读写

 

读ID代码：

int nand_read_id(void)
{   
    int id;

    NAND_CHIP_ENABLE();

    set_val(NFCMMD, 0x90);
    set_val(NFADDR, 0x00);

    NAND_READY();
    printf("id0 = %02x", NFDATA_READ);
    printf(" id1 = %02x\n", NFDATA_READ);

    NAND_CHIP_DISABLE();
}

擦块代码：

void nand_block_erase(u32 addr)
{
    int i;

    NAND_CHIP_ENABLE();
    set_val(NFCMMD, CMD_NAND_BLOCK_ERASE_STAGE1); //命令0x60
    //发送地址
    send_row_addr(addr);
   
    set_val(NFCMMD, CMD_NAND_BLOCK_ERASE_STAGE2); //命令0xD0
    //等待数据擦除
    NAND_READY();

    set_val(NFCMMD, CMD_NAND_READ_STATUS); //命令0x70

    if (NFDATA_READ & 0x1)
        printf("Nand Block Erase Faile.\n");
    NAND_CHIP_DISABLE();
}