Help¶

SPIM peripherals cannot transmit data directly from flash. Therefore, a buffer in RAM needs to be provided for each instance of SPI driver using SPIM peripheral, so that the driver can copy there a chunk of data from flash and transmit it. The size is specified in bytes. A size of 0 means that this feature should be disabled, and the application must then take care of not supplying buffers located in flash to the driver, otherwise such transfers will fail.

Direct dependencies¶

(SPI_NRFX && SPI && BOARD_REEL_BOARD) || (NRFX_SPIM && SPI_NRFX && SPI)

(Includes any dependencies from if’s and menus.)

Defaults¶

8 if SPI_NRFX && SPI && BOARD_REEL_BOARD
0 if NRFX_SPIM && SPI_NRFX && SPI

Kconfig definitions¶

At boards/arm/reel_board/Kconfig.defconfig:76

Included via Kconfig:10 → Kconfig.zephyr:19

Menu path: (top menu)

config SPI_NRFX_RAM_BUFFER_SIZE
    int
    default 8 if SPI_NRFX && SPI && BOARD_REEL_BOARD
    depends on SPI_NRFX && SPI && BOARD_REEL_BOARD

At drivers/spi/Kconfig.nrfx:336

Included via Kconfig:10 → Kconfig.zephyr:29 → drivers/Kconfig:38 → drivers/spi/Kconfig:269

Menu path: (top menu) → Device Drivers → SPI hardware bus support → nRF SPI nrfx drivers

config SPI_NRFX_RAM_BUFFER_SIZE
    int
    prompt "Size of RAM buffer" if NRFX_SPIM && SPI_NRFX && SPI
    default 0 if NRFX_SPIM && SPI_NRFX && SPI
    depends on NRFX_SPIM && SPI_NRFX && SPI
    help
      SPIM peripherals cannot transmit data directly from flash. Therefore,
      a buffer in RAM needs to be provided for each instance of SPI driver
      using SPIM peripheral, so that the driver can copy there a chunk of
      data from flash and transmit it.
      The size is specified in bytes. A size of 0 means that this feature
      should be disabled, and the application must then take care of not
      supplying buffers located in flash to the driver, otherwise such
      transfers will fail.

(Definitions include propagated dependencies, including from if’s and menus.)