你好：

咨询一个问题：我用STM32H743IIT6芯片，STM32CubeIDE，使用FMC驱动NAND FLASH，NAND FLASH ID读取正常。但是有几个问题：

1. 擦除完block后，马上读取该block的页，值是0xe0或0x00。再读一次就变成0xff. 这是怎么造成的？
2. 使用HAL_NAND_Write_Page_8b()时，一直卡在while (HAL_NAND_Read_Status(hnand) != NAND_READY)。因为读取的状态一直是0xFF. 为什么读取的状态一直是0xFF呢？

这是我的测试代码：

void NAND_Erase_Chip(void)
{
    HAL_StatusTypeDef err_code = HAL_OK;
    NAND_AddressTypeDef addr = {0};
    for(uint16_t i = 0; i < nand_dev.block_totalnum; i++)
    {
        addr.Block = i;
        printf("Erase block %d\r\n", i);
        err_code = HAL_NAND_Erase_Block(&hnand1, &addr);
        if(err_code)
        {
            printf("Erase %d block fail!! Error code is %d\r\n", i, err_code);
        }
    }
}

uint8_t Test_Read_Page(uint16_t block_num, uint16_t page_num)
{
    static uint8_t first_time_exe = 0;
    uint8_t *pbuf;
    uint8_t sta = 0;
    uint16_t i = 0;
    NAND_AddressTypeDef addr = {0};

    addr.Block = block_num;
    addr.Page = page_num;

    printf("\r\n ========Read block %d page %d ========\r\n", block_num, page_num);

    if(first_time_exe == 0)
    {
//        printf("Start to erase chip...\r\n");
//        NAND_Erase_Chip();
//        printf("Erase chip finished...\r\n");
        printf("Start to erase block %d...\r\n", block_num);
        sta = HAL_NAND_Erase_Block(&hnand1, &addr);
        if(sta)
        {
            printf("Erase block failed...\r\n");
        }
        else
        {
            printf("Erase block finished...\r\n");
        }
        first_time_exe = 1;
        NAND_Delay(100);
    }
    pbuf = My_Malloc(SRAM1, hnand1.Config.PageSize);
    sta = HAL_NAND_Read_Page_8b(&hnand1, &addr, pbuf, 1);
    if(sta == HAL_OK)
    {
        printf("read block %d page %d data is: \r\n", addr.Block, addr.Page);
        for(i = 0; i < hnand1.Config.PageSize; i++)
        {
            printf("%x ", pbuf[i]);
        }
        printf("\r\n");
    }
    My_Free(SRAM1, pbuf);
    return sta;
}

uint8_t Test_Write_Page(uint16_t block_num, uint16_t page_num)
{
    uint8_t *pbuf;
    uint8_t sta = 0;
    uint16_t i = 0;
    NAND_AddressTypeDef addr = {0};

    pbuf = My_Malloc(SRAM1, hnand1.Config.PageSize);
    addr.Block = block_num;
    addr.Page = page_num;

    for(i = 0; i < hnand1.Config.PageSize; i++)
    {
        pbuf[i] = i;
    }
    printf("Start to write page...\r\n");
    sta = HAL_NAND_Write_Page_8b(&hnand1, &addr, pbuf, 1);
    printf("Write page finished. Error code is %d\r\n", sta);
    My_Free(SRAM1, pbuf);
    return sta;
}

void Test_Nand(void)
{
    NAND_IDTypeDef pNAND_ID;
    HAL_NAND_Reset(&hnand1);
    HAL_NAND_Read_ID(&hnand1, &pNAND_ID);
    printf("NAND ID is: 0x%x-%x-%x-%x\r\n", pNAND_ID.Maker_Id, pNAND_ID.Device_Id, pNAND_ID.Third_Id, pNAND_ID.Fourth_Id);
    Test_Read_Page(10, 10);
    Test_Write_Page(10, 10);
    printf("Read data again...\r\n");
    Test_Read_Page(9, 9);
    Test_Read_Page(10, 10);
    Test_Read_Page(11, 11);
}