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Merge pull request #1611 from haukepetersen/add_stm32f4_random

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cpu/stm32f4: added random number generator driver
This commit is contained in:
Thomas Eichinger 2014-08-25 14:51:04 +02:00
commit 4a7b4a5b15
2 changed files with 71 additions and 5 deletions
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11
boards/stm32f4discovery/include/periph_conf.h
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@ -37,7 +37,6 @@
#define CLOCK_FLASH_LATENCY FLASH_ACR_LATENCY_5WS
/** @} */
/**
* @name Timer configuration
* @{
@ -66,7 +65,6 @@
#define TIMER_1_IRQ_CHAN TIM5_IRQn
/** @} */
/**
* @name UART configuration
* @{
@ -106,7 +104,6 @@
#define UART_1_AF 7
/** @} */
/**
* @name ADC configuration
* @{
@ -145,7 +142,6 @@
#define ADC_1_CH1_PIN 2
/** @} */
/**
* @name PWM configuration
* @{
@ -186,6 +182,12 @@
#define PWM_1_PIN_AF 2
/** @} */
/**
* @name Random Number Generator configuration
* @{
*/
#define RANDOM_NUMOF (1U)
/** @} */
/**
* @name SPI configuration
@ -260,7 +262,6 @@
#define I2C_1_SDA_AFCFG()
/** @} */
/**
* @name GPIO configuration
* @{

65
cpu/stm32f4/periph/random.c Normal file
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@ -0,0 +1,65 @@
/*
* Copyright (C) 2014 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup cpu_stm32f4
* @{
*
* @file
* @brief Low-level random number generator driver implementation
*
* @author Hauke Petersen <mail@haukepetersen.de>
*
* @}
*/
#include "cpu.h"
#include "periph/random.h"
#include "periph_conf.h"
/* ignore file in case no RNG device is defined */
#if RANDOM_NUMOF
void random_init(void)
{
random_poweron();
}
int random_read(char *buf, unsigned int num)
{
uint32_t tmp;
int count = 0;
while (count < num) {
/* wait for random data to be ready to read */
while (!(RNG->SR & RNG_SR_DRDY));
/* read next 4 bytes */
tmp = RNG->DR;
/* copy data into result vector */
for (int i = 0; i < 4 && count < num; i++) {
buf[count++] = (char)tmp;
tmp = tmp >> 8;
}
}
return count;
}
void random_poweron(void)
{
RCC->AHB2ENR |= RCC_AHB2ENR_RNGEN;
RNG->CR = RNG_CR_RNGEN;
}
void random_poweroff(void)
{
RNG->CR = 0;
RCC->AHB2ENR &= ~RCC_AHB2ENR_RNGEN;
}
#endif /* RANDOM_NUMOF */