nRF52840 QSPI XIP read function，qspi can't reinit

[bh.niu]

We used qspi  xip read function.
If I uninit qspi and then init qspi again，the mcu halted。

ret = nrf_drv_qspi_init(p_qspi_cfg, qspi_handler, (void *)p_blk_dev);


u8_t tmp = *(__IO uint8_t*)(0x12000000);

nrf_drv_qspi_uninit();

ret = nrf_drv_qspi_init(p_qspi_cfg, qspi_handler, (void *)p_blk_dev);

Is there a problem with my use? What can i do now。

[Simonr]

Hi

How does your nrf_drv_qspi_uninit() function look? Please be aware of erratum 122 present in nRF52840, so the uninitialization should look something like this:

    *(volatile uint32_t *)0x40029010ul = 1ul;
    *(volatile uint32_t *)0x40029054ul = 1ul;
    nrf_drv_qspi_uninit();

If the problem persists, can you try to explain how the MCU is halted exactly?

Best regards,

Simon

[bh.niu]

Thank you  for reply. I tried the way you said, but it still doesn't work。

The reason of MCU halted is because of this code：
u8_t tmp = *(__IO uint8_t*)(0x12000000);


After the MCU halted, if I stop debugging, Keil will pop up such a prompt.