SoftDevice memory usage

S112 SoftDevice Specification

The SoftDevice shares the available flash memory and RAM on the nRF52 System on Chip (SoC) with the application. The application must therefore be aware of the memory resources needed by the SoftDevice and leave the parts of the memory used by the SoftDevice undisturbed for correct SoftDevice operation.

The SoftDevice requires a fixed amount of flash memory and RAM, which are detailed in Memory resource requirements. In addition, depending on the runtime configuration, the SoftDevice will require:
  • Memory resource map and usage
    The memory map for program memory and RAM when the SoftDevice is enabled is described in this section.
  • Attribute table size
    The size of the attribute table can be configured through the SoftDevice API when enabling the Bluetooth Low Energy stack.
  • Role configuration
    The SoftDevice allows the number of connections, the configuration of each connection, and its role to be specified by the application.
  • Vendor specific UUID counts
    The SoftDevice allows the use of vendor specific UUIDs, which are stored by the SoftDevice in the RAM that is allocated once the SoftDevice is enabled.