int nand_write(unsigned int nand_start, unsigned char * buf, unsigned int len)
{
unsigned long count = 0;
unsigned long addr = nand_start;
int i = nand_start % 2048;
nand_select();
while (count < len)
{
nand_cmd(0x80);
nand_send_addr(addr);
for (; i < 2048 && count < len; i++)
{
nand_send_data(buf[count++]);
addr++;
}
nand_cmd(0x10);
wait_ready();
i = 0;
}
nand_deselect();
}
static void nand_reset(){
int i;
nand_select();
NFCMD=NAND_CMD_RESET;
for(i=0;i<10;i++);
nand_wait();
nand_deselect();
}
static 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();
}
int nand_erase_block(unsigned long addr)
{
int page = addr / 2048;
nand_select();
nand_cmd(0x60);
nand_addr(page & 0xff);
nand_addr((page >> 8) & 0xff);
nand_addr((page >> 16) & 0xff);
nand_cmd(0xd0);
wait_ready();
nand_deselect();
}
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;
}
