NAND Flash K60 Using

NAND Flash K60 Using

本系統使用了Freescale(NXP)的MK60D系列芯片+Keil的IDE編譯環境+YANDLD編寫的K60庫

硬件接法

程序

*初始化、讀取芯片信息

     /* 初始化SPI接口 */
    SPI_QuickInit(SPI2_SCK_PD12_SOUT_PD13_SIN_PD14, kSPI_CPOL0_CPHA0, 30*1000*1000);

    /* 初始化片選*/
    PORT_PinMuxConfig(HW_GPIOD, 15, kPinAlt2); /* SPI2_PCS1 */

    /* 獲取SPI-Flash信息 */

    if(w25qxx_init(HW_SPI2, HW_SPI_CS1))
    {
        printf("w25qxx device no found!\r\n");
    }
    else
    {
        struct w25qxx_attr_t w25qxx;
        w25qxx_get_attr(&w25qxx);
        printf("%s(0x%X) detected!\r\n", w25qxx.name, w25qxx.id);
        printf("total size:%dKB\r\n", w25qxx.size/1024);
        printf("block size:%dKB\r\n", w25qxx.block_size/1024);
        printf("sector size:%d\r\n", w25qxx.sector_size);
        printf("page size:%d\r\n", w25qxx.page_size);

        buf_size = sizeof(buf);
        block = w25qxx.size/buf_size;
    }

---

w25qxx_attr_t類型的結構體，在w25qxx.h中定義：

struct w25qxx_attr_t
{
    const char* name;
    uint32_t size;
    uint16_t id;
    uint32_t page_size;
    uint32_t sector_size;
    uint32_t block_size;
};

---

w25qxx_init(HW_SPI2, HW_SPI_CS1)函數中包括SPI選擇、SPI模式、SPI片選、w25qxx_probe()獲取芯片的信息：

//芯片初始化
int w25qxx_init(uint32_t instance, uint32_t cs)
{
    w25_dev.spi_instance = instance;
    w25_dev.spi_cs = cs; 
    SPI_CTARConfig(instance, HW_CTAR0, kSPI_CPOL0_CPHA0, 8, kSPI_MSB, 30*1000*1000);

    return w25qxx_probe();
}

再來看其中的w25qxx_probe()如何獲取芯片信息：

//芯片探測
static int w25qxx_probe(void)
{
    uint32_t i;
    uint16_t id;
    uint8_t buf[2];

    /* read id */
    spi_xfer(W25X_ManufactDeviceID, kSPI_PCS_KeepAsserted);
    spi_xfer(0, kSPI_PCS_KeepAsserted);
    spi_xfer(0, kSPI_PCS_KeepAsserted);
    spi_xfer(0, kSPI_PCS_KeepAsserted);
    buf[0] = spi_xfer(0, kSPI_PCS_KeepAsserted);
    buf[1] = spi_xfer(0, kSPI_PCS_ReturnInactive);
    id = ((buf[0]<<8) + buf[1]);
    W25QXX_TRACE("ID:0x%X\r\n", id);
    //see if we find a match
    for(i = 0; i< ARRAY_SIZE(w25qxx_tbl);i++)
    {
        if(w25qxx_tbl[i].id == id)
        {
            /* find a match */
            w25_dev.attr = w25qxx_tbl[i];
            w25qxx_power_up();
            buf[0] = w25qxx_read_sr();
            W25QXX_TRACE("SR:0x%X\r\n", buf[0]);
            buf[0] = w25qxx_read_sr2();
            W25QXX_TRACE("SR2:0x%X\r\n", buf[0]);
            // enable full access to all memory regin, something like unlock chip.
            w25qxx_write_sr(0x00);
            return 0; 
        }
    }
    return 1;
}

通過：

    /* read id */
    spi_xfer(W25X_ManufactDeviceID, kSPI_PCS_KeepAsserted);
    spi_xfer(0, kSPI_PCS_KeepAsserted);
    spi_xfer(0, kSPI_PCS_KeepAsserted);
    spi_xfer(0, kSPI_PCS_KeepAsserted);
    buf[0] = spi_xfer(0, kSPI_PCS_KeepAsserted);
    buf[1] = spi_xfer(0, kSPI_PCS_ReturnInactive);
    id = ((buf[0]<<8) + buf[1]);
    W25QXX_TRACE("ID:0x%X\r\n", id);

獲取芯片的ID信息，ID信息通過SPI訪問芯片內部預先寫好的寄存器

#define W25X_DeviceID           0xAB

然後根據ID查表，進行進一步匹配來獲取芯片的其他信息：

//W25系列芯片信息
static const struct w25qxx_attr_t w25qxx_tbl[] = 
{
    {"W25Q10",    128*1024, 0xEF10, 256, 4096, (64*1024)},
    {"W25Q20",    256*1024, 0xEF11, 256, 4096, (64*1024)},
    {"W25Q40",    512*1024, 0xEF12, 256, 4096, (64*1024)},
    {"W25Q80",   1024*1024, 0xEF13, 256, 4096, (64*1024)},
    {"W25Q16",   2048*1024, 0xEF14, 256, 4096, (64*1024)},
    {"W25Q32",   4096*1024, 0xEF15, 256, 4096, (64*1024)},
    {"W25Q64",   8192*1024, 0xEF16, 256, 4096, (64*1024)},
    {"W25Q128", 16384*1024, 0xEF17, 256, 4096, (64*1024)}, 
};

讀寫Flash

預先設置兩個buff，buf用來寫入Flash，buf2用來讀取Flash

static uint8_t buf[4*512];
static uint8_t buf2[4*512];

再對buf進行賦初值：

 for(j=0;j<sizeof(buf);j++)
   {
       buf[j] = j % 0xFF;
   }

新建兩個變量：block，buf_size

uint32_t block,buf_size;
buf_size = sizeof(buf);
block = w25qxx.size/buf_size;

此處，block不是Flash的硬件Block，而是指將整個Flash根據Buf的大小，分爲幾塊，故block = w25qxx.size/buf_size；
再寫入數據，寫入第3個block：

w25qxx_write(3*block, buf, buf_size);

再讀取數據，並顯示：

w25qxx_read(3*block, buf2, buf_size);
for(j=0;j<sizeof(buf2);j++)
{
    printf("writeData %d:%d------",j,buf[j]);
    printf("readData %d:%d\n\r",j,buf2[j]);
}

效果：