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MCU-PLUS-SDK-AM263X: How to use the QSPI Memory Mapped (SFI) interface?

Joe Schirmer
Prodigy 81 points
Part Number: MCU-PLUS-SDK-AM263X

I would like to use the QSPI's SFI interface to access the flash on the am263x-cc in a non-rots environment.  The SDK appears to set up the MSS_QSPI0_SPI_SETUP0 register and then access the memory mapped region, EXT_FLASH0 located at 0x60000000,1 byte at a time.  Is there anything else that needs to be done to kick off the read from flash? How would the setup differ to read 4 bytes at a time?

  • 0
    TI__Intellectual 2425 points

    Hi Joe,

    QSPI_SPI_SWITCH_REG should also be configured to enable Memory mapped mode before reading from flash.

    QSPI register configuration is not required to specify the number of bytes to be read at a time in Mem Mapped mode. Read size is based on the type of read that CPU does to the mem mapped address. SDK currently uses uint8_t to access the address and thus the read will be 1 Byte at a time. To change it to 4 Bytes, you may use uint32_t for the address.

    Regards,

    Ashwin

  • 0 in reply to Ashwin Raj
    Prodigy 81 points

    Thank you for the answer.

    Are there any restriction on writing/reading from/to the memory mapped area?  For example are both word and byte access allowed?  

  • 0 in reply to Joe Schirmer
    TI__Intellectual 2425 points

    Hi Joe,

    QSPI IP doesn't have any such restrictions. Since NOR flashes normally have an internal buffer of 256Bytes (Equal to page size and used only for writes), there is a restriction that only a maximum of 256Bytes can be written in one go. After which, the WIP bit in flash should be checked to make sure that the write is complete.

    Regards,

    Ashwin