RE: RNG exception AFTER BLE initialization

Amanda Hsieh — Mon, 15 Jun 2020 12:56:59 GMT

Hi,

Please see my colleague Einar's answer in this post.

-Amanda H.

RE: RNG exception AFTER BLE initialization

hmolesworth — Sun, 14 Jun 2020 17:17:31 GMT

I have some notes I made which might help regarding restricted and unavailable peripherals, including the RNG, though I don't offhand know the availability of sd call functions when these restrictions are in place without a search through the sd functions

// Access type Definition
// ======================
// Restricted
//   The hardware peripheral is used by the SoftDevice and is outside
//   the application sandbox. When the SoftDevice is enabled, it shall
//   only be accessed through the SoftDevice API. Through this API, the
//   application has limited access.
// Blocked
//   The hardware peripheral is used by the SoftDevice and is outside the
//   application sandbox.
//   The application has no access. Interrupts from blocked peripherals
//   are forwarded to the SoftDevice by the MBR and are not available to
//   the application, even inside a Radio Timeslot API timeslot.
// Open
//   The hardware peripheral is not used by the SoftDevice.
//   The application has full access.
//
// Table 3: Hardware access type definitions
//
// Instance SD Enabled  SD Disabled Restrictions
// ======== ==========  =========== ======================================================
// CLOCK    Restricted    Open
// POWER    Restricted    Open
// BPROT    Restricted    Open
// RADIO    Blocked       Open      Available through the Radio Timeslot API
// TIMER0   Blocked       Open      Available through the Radio Timeslot API
// RTC0     Blocked       Open
// TEMP     Restricted    Open
// RNG      Restricted    Open
// ECB      Restricted    Open
// CCM      Blocked       Open      Available during a Radio Timeslot API
// AAR      Blocked       Open      Available during a Radio Timeslot API
// EGU/SWI1 Restricted    Open      Blocked only when Radio Notification signal is enabled
// Radio    Restricted    Open      Blocked only when Radio Notification signal is enabled
// EGU/SWI5 Blocked       Open
// NVMC     Restricted    Open
// MWU      Restricted    Open      Limitations on use of MWU when SoftDevice is enabled
// FICR     Blocked       Blocked
// UICR     Restricted    Open
// NVIC     Restricted    Open      Use SoftDevice NVIC API for configuration when SoftDevice enabled

Maybe look at something like nrf_crypto_rng_init() in nrf_crypto_rng.c tosee if that makes clear the restrictions