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r nand_data(void)
{
return NFDATA;
}
void nand_chip_id(void)
{
unsigned char buf[5]={0};
nand_select();
nand_cmd(0x90);
nand_addr(0x00);
buf[0] = nand_data();
buf[1] = nand_data();
buf[2] = nand_data();
buf[3] = nand_data();
buf[4] = nand_data();
nand_deselect();
puts("maker id\n\r");
puthex(buf[0]);
puts("\n\r");
puts("device id\n\r");
puthex(buf[1]);
puts("\n\r");
puts("3rd byte\n\r");
puthex(buf[2]);
puts("\n\r");
puts("4th byte\n\r");
puthex(buf[3]);
puts("\n\r");
puts("page size\n\r");
puthex(1 << (buf[3] & 0x03));
puts("\n\r");
puts("block size\n\r");
puthex(64 << ((buf[3] >> 4) & 0x03));
puts("\n\r");
puts("5th byte\n\r");
puthex(buf[4]);
}
void nand_w_data(unsigned char val)
{
NFDATA = val;
}
void nand_read(unsigned int addr, unsigned char *buf, unsigned int len)
{
int col = addr % 2048;
int i = 0;
/* 1. 选中 */
nand_select();
while (i < len)
{
/* 2. 发出读命令00h */
nand_cmd(0x00);
/* 3. 发出地址(分5步发出) */
nand_addr(addr);
/* 4. 发出读命令30h */
nand_cmd(0x30);
/* 5. 判断状态 */
nand_wait_ready();
/* 6. 读数据 */
for (; (col < 2048) && (i < len); col++)
{
buf[i] = nand_data();
i++;
addr++;
}
col = 0;
}
/* 7. 取消选中 */
nand_deselect();
}
void nand_addr_byte(unsigned char addr)
{
volatile int i;
NFADDR = addr;
for(i=0; i<10; i++);
}
int nand_erase(unsigned int addr, unsigned int len)
{
int page = addr / 2048;
if (addr & (0x1FFFF))
{
puts("nand_erase err, addr is not block align\n\r");
return 0;
}
if (len & (0x1FFFF))
{
puts("nand_erase err, len is not block align\n\r");
return 0;
}
nand_select();
while (1)
{
page = addr / 2048;
nand_cmd(0x60);
/* row/page addr */
nand_addr_byte(page & 0xff);
nand_addr_byte((page>>8) & 0xff);
nand_addr_byte((page>>16) & 0xff);
nand_cmd(0xD0);
nand_wait_ready();
len -= (128*1024);
if (len == 0)
break;
addr += (128*1024);
}
nand_deselect();
return 1;
}
void nand_write(unsigned int addr, unsigned char *buf, unsigned int len)
{
int page = addr / 2048;
int col = addr & (2048 - 1);
int i = 0;
nand_select();
while (1)
{
nand_cmd(0x80);
nand_addr(addr);
/* 发出数据 */
for (; (col < 2048) && (i < len); )
{
nand_w_data(buf[i++]);
}
nand_cmd(0x10);
nand_wait_ready();
if (i == len)
break;
else
{
/* 开始下一个循环page */
col = 0;
page++;
}
}
nand_deselect();
}
#define PCLK 50000000 // init.c中的clock_init函数设置PCLK为50MHz
#define UART_CLK PCLK // UART0的时钟源设为PCLK
#define UART_BAUD_RATE 115200 // 波特率
#define UART_BRD ((UART_CLK / (UART_BAUD_RATE * 16)) - 1)
/*
* 初始化UART0
* 115200,8N1,无流控
*/
void uart0_init(void)
{
GPHCON |= 0xa0; // GPH2,GPH3用作TXD0,RXD0
GPHUP = 0x0c; // GPH2,GPH3内部上拉
ULCON0 = 0x03; // 8N1(8个数据位，无较验，1个停止位)
UCON0 = 0x05; // 查询方式，UART时钟源为PCLK
UFCON0 = 0x00; // 不使用FIFO
UMCON0 = 0x00; // 不使用流控
UBRDIV0 = UART_BRD; // 波特率为115200
}
/*
* 发送一个字符
*/
void putc(unsigned char c)
{
/* 等待，直到发送缓冲区中的数据已经全部发送出去 */
while (!(UTRSTAT0 & TXD0READY)) |