tm_stm32_rng.c

00001 /** 
00002  * |----------------------------------------------------------------------
00003  * | Copyright (C) Tilen Majerle, 2014
00004  * | 
00005  * | This program is free software: you can redistribute it and/or modify
00006  * | it under the terms of the GNU General Public License as published by
00007  * | the Free Software Foundation, either version 3 of the License, or
00008  * | any later version.
00009  * |  
00010  * | This program is distributed in the hope that it will be useful,
00011  * | but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  * | GNU General Public License for more details.
00014  * | 
00015  * | You should have received a copy of the GNU General Public License
00016  * | along with this program.  If not, see <http://www.gnu.org/licenses/>.
00017  * |----------------------------------------------------------------------
00018  */
00019 #include "tm_stm32_rng.h"
00020 
00021 void TM_RNG_Init(void) {
00022     /* Enable RNG clock source */
00023     __HAL_RCC_RNG_CLK_ENABLE();
00024     
00025     /* RNG Peripheral enable */
00026     RNG->CR |= RNG_CR_RNGEN;
00027 }
00028 
00029 void TM_RNG_DeInit(void) {
00030     /* Disable RNG peripheral */
00031     RNG->CR &= ~RNG_CR_RNGEN;
00032     
00033     /* Disable RNG clock source */
00034     __HAL_RCC_RNG_CLK_DISABLE();
00035 }
00036 
00037 uint32_t TM_RNG_Get(void) {
00038     /* Wait until one RNG number is ready */
00039     while (!(RNG->SR & (RNG_SR_DRDY)));
00040 
00041     /* Get a 32-bit Random number */
00042     return RNG->DR;
00043 }