REG_WRITE_ENABLE
u8 cmd_wren[3] = { REG_WRITE_ENABLE, 0x5a, 0xa5 };
REG_WRITE_ENABLE, 0x5a, 0xa5, dataflash,
ret = __write_reg(hw, REG_WRITE_ENABLE, 1);
ret = __write_reg(hw, REG_WRITE_ENABLE, 0);