Write up to 24 bits (num_bytes) of new status register

        num_bytes can be 1, 2 or 3.

        Not all flash supports the additional commands to write the
        second and third byte of the status register. When writing 2
        bytes, esptool also sends a 16-byte WRSR command (as some
        flash types use this instead of WRSR2.)

        If the set_non_volatile flag is set, non-volatile bits will
        be set as well as volatile ones (WREN used instead of WEVSR).

def write_status(self, new_status, num_bytes=2, set_non_volatile=False):
        """Write up to 24 bits (num_bytes) of new status register

        num_bytes can be 1, 2 or 3.

        Not all flash supports the additional commands to write the
        second and third byte of the status register. When writing 2
        bytes, esptool also sends a 16-byte WRSR command (as some
        flash types use this instead of WRSR2.)

        If the set_non_volatile flag is set, non-volatile bits will
        be set as well as volatile ones (WREN used instead of WEVSR).

        """
        SPIFLASH_WRSR = 0x01
        SPIFLASH_WRSR2 = 0x31
        SPIFLASH_WRSR3 = 0x11
        SPIFLASH_WEVSR = 0x50
        SPIFLASH_WREN = 0x06
        SPIFLASH_WRDI = 0x04

        enable_cmd = SPIFLASH_WREN if set_non_volatile else SPIFLASH_WEVSR

        # try using a 16-bit WRSR (not supported by all chips)
        # this may be redundant, but shouldn't hurt
        if num_bytes == 2:
            self.run_spiflash_command(enable_cmd)
            self.run_spiflash_command(SPIFLASH_WRSR, struct.pack("<H", new_status))

        # also try using individual commands (also not supported by all chips for num_bytes 2 & 3)
        for cmd in [SPIFLASH_WRSR, SPIFLASH_WRSR2, SPIFLASH_WRSR3][0:num_bytes]:
            self.run_spiflash_command(enable_cmd)
            self.run_spiflash_command(cmd, struct.pack("B", new_status & 0xFF))
            new_status >>= 8

        self.run_spiflash_command(SPIFLASH_WRDI)