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nrf softdevice calculator

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SoftDevice Memory Configurator (BLE Stack)

Nordic Bluetooth stacks (SoftDevice) enforce a strict division of RAM and Flash memory. Your C/C++ application linker needs to be informed where SoftDevice ends and the Application begins. Change the BLE connection parameters to calculate addresses for the Linker file (*.ld / *.icf).

BLE Connection Parameters

SoftDevice Version

Peripheral Links

Central Links

MTU Size (ATT_MTU)

Default 23 bytes. Longer frames (e.g. 247 for Data Length Extension) consume more RAM.

Custom UUIDs (128-bit VS UUIDs)

Addresses for Linker Script (GCC .ld)

FLASH_START

0x26000

FLASH_SIZE: 0x5A000 (360 KB for Application)

RAM_START

0x20001910

RAM_SIZE: 0xE6F0 (57.7 KB for Application)

If after enabling the stack `sd_ble_enable()` the chip resets or hangs (HardFault), most likely `RAM_START` in your linker starts too early. Update your `.ld` file with the values above!

MODULE UNDER CONSTRUCTION

EXPECTED DEPLOYMENT: Q4 2026