操作完flash后，开发板无法与smartsnippets连接

[INFO SPI Flash @20-03-27 10:38:32] Firmware File C:\software\SmartSnippetsStdio\SmartSnippetsStudio\Toolbox\common_resources\flash_programmer.bin has been selected for downloading.
[INFO SPI Flash @20-03-27 10:38:32] Connection to COM20 port has successfully opened.
[INFO SPI Flash @20-03-27 10:38:32] Started download procedure...
[ACTION SPI Flash @20-03-27 10:38:33] Please press the hardware reset button on the board to start the download process.
[INFO SPI Flash @20-03-27 10:38:39] Reset detected

这是smartsnippets的log，就卡在reset detected，是我对flash误操作了，以下是我的flash操作代码，我按照SDK做的修改，代码中先执行user_read_data_from_flash读地址，再进行user_save_data_to_flash写

void user_read_data_from_flash(uint8_t* ptr, uint8_t size)
{
int8_t dev_id;

dev_id = spi_flash_enable (SPI_EN_GPIO_PORT SPI_EN_GPIO_PIN);
if (dev_id == SPI_FLASH_AUTO_DETECT_NOT_DETECTED)
{
// The device was not identified. The default parameters are used.
// Alternatively, an error can be asserted here.
spi_flash_init(SPI_FLASH_DEFAULT_SIZE, SPI_FLASH_DEFAULT_PAGE);
}

spi_cs_low();

spi_cs_high();

//save data
spi_flash_read_data(ptr,SPI_SAVE_BLOCK,size);


// Power down SPI Flash
spi_flash_power_down();

}

void user_save_data_to_flash(uint8_t* ptr, uint8_t size)
{
int8_t dev_id;

dev_id = spi_flash_enable (SPI_EN_GPIO_PORT SPI_EN_GPIO_PIN);
if (dev_id == SPI_FLASH_AUTO_DETECT_NOT_DETECTED)
{
// The device was not identified. The default parameters are used.
// Alternatively, an error can be asserted here.
spi_flash_init(SPI_FLASH_DEFAULT_SIZE, SPI_FLASH_DEFAULT_PAGE);
}

spi_cs_low();

spi_cs_high();

//save data
spi_flash_block_erase(SPI_SAVE_BLOCK, SECTOR_ERASE);
spi_flash_write_data(ptr, SPI_SAVE_BLOCK, size);

// Power down SPI Flash
spi_flash_power_down();

}