Hi all, I try to read the Manufacturer ID of a SPI Flash W25Q80BV. The flash is 3.3V, so I use a CD4050 for level shifting 5V to 3.3V for SCK, SS, MOSI. MISO is connected directly between the flash and the Arduino. The length wire is 15cm, and I have to slow down the clock to 1MHz in order to have…

Problem with SPI Flash memory

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