/**
* @brief Paints exit button
* @param hObj: button handle
* @retval None
*/
static void _BuildFileName(void) {
hRNG.Instance = RNG;
__HAL_RCC_RNG_CLK_ENABLE();
HAL_RNG_Init(&hRNG);
sprintf(FileName, "record-%04lu.wav", HAL_RNG_GetRandomNumber(&hRNG) % 10000);
}
/** mbedtls_hardware_poll
* @brief Get len bytes of entropy from the hardware RNG.
* @param data pointer will be NULL
* @param output pointer to the random generated bytes buffer
* @param len input is the requested length of bytes to be generated
* @param olen is the pointer to the length of bytes effectively generated
* @returns 0 if the generation went well. -1 in case of error
*/
int mbedtls_hardware_poll( void *data, unsigned char *output, size_t len, size_t *olen )
{
int ret;
((void) data);
/* RNG Peripheral clock enable */
__HAL_RCC_RNG_CLK_ENABLE();
/* Initialize RNG instance */
RngHandle.Instance = RNG;
HAL_RNG_Init(&RngHandle);
/* Get Random byte */
for( uint32_t i = 0; i < len; i++ ){
rng_get_byte( output + i );
}
*olen = len;
/* Just be extra sure that we didn't do it wrong */
if( ( __HAL_RNG_GET_FLAG(&RngHandle, (RNG_FLAG_CECS|RNG_FLAG_SECS)) ) != 0 ) {
ret = -1;
} else {
ret = 0;
}
/*Disable the RNG peripheral */
HAL_RNG_DeInit(&RngHandle);
/* RNG Peripheral clock disable - assume we're the only users of RNG */
__HAL_RCC_RNG_CLK_DISABLE();
return( ret );
}
void stm32_rng_init(void)
{
RNG_HandleTypeDef rng_handle = { 0 };
__HAL_RCC_RNG_CLK_ENABLE();
rng_handle.Instance = RNG;
HAL_StatusTypeDef status = HAL_RNG_Init(&rng_handle);
if (status != HAL_OK) {
panic("error initializing random number hardware\n");
}
/* seed the pseudo random number generator with this */
#if STM32_SEED_RAND_FROM_HWRNG
uint32_t r;
/* discard he first result */
status = HAL_RNG_GenerateRandomNumber(&rng_handle, &r);
if (status != HAL_OK) {
panic("error getting random number from hardware\n");
}
status = HAL_RNG_GenerateRandomNumber(&rng_handle, &r);
if (status != HAL_OK) {
panic("error getting random number from hardware\n");
}
srand(r);
#endif
}
/**
* @brief RNG MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* @param hrng: RNG handle pointer
* @retval None
*/
void HAL_RNG_MspInit(RNG_HandleTypeDef *hrng)
{
/* RNG Peripheral clock enable */
__HAL_RCC_RNG_CLK_ENABLE();
}
/**
* @brief Initializes the Global MSP.
* @param None
* @retval None
*/
void HAL_MspInit(void)
{
/* NOTE : This function is generated automatically by MicroXplorer and eventually
modified by the user
*/
/* Enable UART 4 clock */
__HAL_RCC_UART4_CLK_ENABLE();
/* RNG Periph clock enable */
__HAL_RCC_RNG_CLK_ENABLE();
#ifdef USE_STM32F4XX_HW_CRYPTO
/* Enable CRYP clock */
__HAL_RCC_CRYP_CLK_ENABLE();
/* Enable Hash clock */
__HAL_RCC_HASH_CLK_ENABLE();
#endif
}
void enableRNG(){
__HAL_RCC_RNG_CLK_ENABLE();
RNG_reg->RNG_CR = 0x00000004;
}
