我用SPI外挂一个FLASH（MF25F01）
1：擦除整个芯片
2：写数据
3：读数据
结果用逻辑分析仪抓波形，写数据的波形都正确（MOSI），但是读数据一直为0x00（MISO），我去读制造商ID和设备ID也是一样的，不管怎么操作MISO一直为低
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