Serial NOR Flash read/write operation

[VSASI1]

I need to read/write data into the external Serial NOR Flash (MX25U25645GMI00) via Quad SPI of STM32L412RB board using STM32CubeIDE.

1. I was able to get the Device ID of the MX25U25645GMI00.
2. I am unable to write/read data into the MX25U25645GMI0 in Auto Polling Mode.
3. I need support in writing data using 2 or 4 I/O lines (I was able to pass the Write Enable Command and Chip Erase Command successfully).
4. I need support in reading data using 4 I/O lines (But I get 255 or 136 dec in all the bytes of receive buffer).

[KDJEM.1]

Hello @VSASI1 and welcome to the Community :),

Are you able to write/read data in Indirect Mode?

Could you please take a look at this example "QSPI_ReadWrite_IT" may help you.

Also, I recommend you to refer to these references How to configure OctoSPI and QuadSPI with an STM32? and AN4760 and check your QuadSPI configuration 

Thank you.

Kaouthar

[Tesla DeLorean]

Going to be materially very similar to all other QSPI implementations

Will need to use the 4-byte / 32-bit addressing for a memory >16MB (128Mb)

Writes would be aligned 256-byte pages

2-line should be a matter of the right commands and bit width settings for each of the appropriate phases (ie cmd,address,alt,data..)

4-line likely needing some interaction with status register to switch into the 4-pin "QE" mode mapping the usual WP/HOLD pins into data operation.

https://github.com/STMicroelectronics/STM32CubeL4/tree/master/Drivers/BSP/Components/mx25r6435f

https://github.com/STMicroelectronics/32l496gdiscovery-bsp/blob/8ae27b548258d2d12109a4fd65e791f21131caf6/stm32l496g_discovery_qspi.c

The QSPI peripheral is present in several other STM32 families, the Cube examples from those families and boards should be highly portable.

[Tesla DeLorean]

Provide the specific pin utilization for your board implementation