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Node / ReticulumProjects / RNode_Firmware.git / commits / 0a95f6f

Commit 0a95f6f1074b91f7a42d4a0c76ecd5a087798cc7

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Parents : 16dedc7

Author : Mark Qvist <mark@unsigned.io>

Date : 2025-04-13T14:45:31+02:00

Added nRF hardware RNG

Changes

2 files changed, 37 insertions(+), 4 deletions(-)

M RNode_Firmware.ino +13 -3

M Utilities.h +24 -1

Diff

diff --git a/RNode_Firmware.ino b/RNode_Firmware.ino

index a116b3d..9c5d5ce 100644

--- a/RNode_Firmware.ino

+++ b/RNode_Firmware.ino

@@ -94,14 +94,24 @@ void setup() {

#endif

// Seed the PRNG for CSMA R-value selection

- # if MCU_VARIANT == MCU_ESP32

+ #if MCU_VARIANT == MCU_ESP32

// On ESP32, get the seed value from the

// hardware RNG

- int seed_val = (int)esp_random();

+ unsigned long seed_val = (unsigned long)esp_random();

+ #elif MCU_VARIANT == MCU_NRF52

+ // On nRF, get the seed value from the

+ // hardware RNG

+ unsigned long seed_val = get_rng_seed();

#else

// Otherwise, get a pseudo-random seed

// value from an unconnected analog pin

- int seed_val = analogRead(0);

+ //

+ // CAUTION! If you are implementing the

+ // firmware on a platform that does not

+ // have a hardware RNG, you MUST take

+ // care to get a seed value with enough

+ // entropy at each device reset!

+ unsigned long seed_val = analogRead(0);

#endif

randomSeed(seed_val);

diff --git a/Utilities.h b/Utilities.h

index 3d46027..cfd523c 100644

--- a/Utilities.h

+++ b/Utilities.h

@@ -18,6 +18,7 @@

#if HAS_EEPROM

#include <EEPROM.h>

#elif PLATFORM == PLATFORM_NRF52

+ #include <hal/nrf_rng.h>

#include <Adafruit_LittleFS.h>

#include <InternalFileSystem.h>

using namespace Adafruit_LittleFS_Namespace;

@@ -103,6 +104,28 @@ uint8_t boot_vector = 0x00;

// TODO: Get NRF52 boot flags

#endif

+#if MCU_VARIANT == MCU_NRF52

+ unsigned long get_rng_seed() {

+ nrf_rng_error_correction_enable(NRF_RNG);

+ nrf_rng_shorts_disable(NRF_RNG, NRF_RNG_SHORT_VALRDY_STOP_MASK);

+ nrf_rng_task_trigger(NRF_RNG, NRF_RNG_TASK_START);

+ while (!nrf_rng_event_check(NRF_RNG, NRF_RNG_EVENT_VALRDY));

+ uint8_t rb_a = nrf_rng_random_value_get(NRF_RNG);

+ nrf_rng_event_clear(NRF_RNG, NRF_RNG_EVENT_VALRDY);

+ while (!nrf_rng_event_check(NRF_RNG, NRF_RNG_EVENT_VALRDY));

+ uint8_t rb_b = nrf_rng_random_value_get(NRF_RNG);

+ nrf_rng_event_clear(NRF_RNG, NRF_RNG_EVENT_VALRDY);

+ while (!nrf_rng_event_check(NRF_RNG, NRF_RNG_EVENT_VALRDY));

+ uint8_t rb_c = nrf_rng_random_value_get(NRF_RNG);

+ nrf_rng_event_clear(NRF_RNG, NRF_RNG_EVENT_VALRDY);

+ while (!nrf_rng_event_check(NRF_RNG, NRF_RNG_EVENT_VALRDY));

+ uint8_t rb_d = nrf_rng_random_value_get(NRF_RNG);

+ nrf_rng_event_clear(NRF_RNG, NRF_RNG_EVENT_VALRDY);

+ nrf_rng_task_trigger(NRF_RNG, NRF_RNG_TASK_STOP);

+ return rb_a << 24 | rb_b << 16 | rb_c << 8 | rb_d;

+ }

+#endif

#if HAS_NP == true

#include <Adafruit_NeoPixel.h>

#define NUMPIXELS 1

@@ -349,7 +372,7 @@ void hard_reset(void) {

#elif MCU_VARIANT == MCU_ESP32

ESP.restart();

#elif MCU_VARIANT == MCU_NRF52

- NVIC_SystemReset();

+ NVIC_SystemReset();

#endif

}

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