diff options
| -rw-r--r-- | ports/stm/common-hal/os/__init__.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/ports/stm/common-hal/os/__init__.c b/ports/stm/common-hal/os/__init__.c index 13871a46e..8da7243a3 100644 --- a/ports/stm/common-hal/os/__init__.c +++ b/ports/stm/common-hal/os/__init__.c @@ -72,15 +72,20 @@ bool common_hal_os_urandom(uint8_t *buffer, uint32_t length) { if (HAL_RNG_Init(&handle) != HAL_OK) mp_raise_ValueError(translate("RNG Init Error")); //Assign bytes - for (uint i = 0; i < length; i++) { - uint32_t temp; + uint32_t i = 0; + while (i < length) { + uint32_t new_random; uint32_t start = HAL_GetTick(); //the HAL function has a timeout, but it isn't long enough, and isn't adjustable while(!(__HAL_RNG_GET_FLAG(&handle,RNG_FLAG_DRDY)) && ((HAL_GetTick() - start) < RNG_TIMEOUT)); - if (HAL_RNG_GenerateRandomNumber(&handle, &temp) != HAL_OK) { + if (HAL_RNG_GenerateRandomNumber(&handle, &new_random) != HAL_OK) { mp_raise_ValueError(translate("Random number generation error")); } - buffer[i] = (uint8_t)temp; + for (int j = 0; j < 4 && i < length; j++) { + buffer[i] = new_random & 0xff; + i++; + new_random >>= 8; + } } //shut down the peripheral |