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¶

NRFX_SPIM && SPI_NRFX && SPI

(Includes any dependencies from ifs and menus.)

Default¶

8

Kconfig definition¶

At <Zephyr>/drivers/spi/Kconfig.nrfx:192

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:32 → <Zephyr>/drivers/Kconfig:38 → <Zephyr>/drivers/spi/Kconfig:212

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

config SPI_NRFX_RAM_BUFFER_SIZE
    int "Size of RAM buffers for SPIM peripherals"
    default 8
    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.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)