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Add SoftDevice rng version to MicroBitDevice::seedRandom(). #448

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Add SoftDevice rng version to MicroBitDevice::seedRandom(). #448

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16 changes: 15 additions & 1 deletion source/MicroBitDevice.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,21 @@ void MicroBitDevice::seedRandom()
{
uint32_t r = 0xBBC5EED;

if(!ble_running())
if (ble_running())
{
#ifdef SOFTDEVICE_PRESENT
// If Bluetooth is enabled, we need to go through the Nordic software to safely do this.
uint8_t available_bytes = 0;
while (available_bytes < 4)
sd_rand_application_bytes_available_get(&available_bytes);

uint32_t random_value = 0;
uint32_t result = sd_rand_application_vector_get((uint8_t*)&random_value, sizeof(random_value));
if (result == NRF_SUCCESS)
r = random_value;
#endif
}
else
{
// Start the Random number generator. No need to leave it running... I hope. :-)
NRF_RNG->TASKS_START = 1;
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