Revision 0:1c605984e361, committed 2016-02-08

Comitter:

grantphillips

Date:

Mon Feb 08 20:15:12 2016 +0000

Commit message:

v1.0

Changed in this revision

diff -r 000000000000 -r 1c605984e361 STM32F4_RNG.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/STM32F4_RNG.cpp	Mon Feb 08 20:15:12 2016 +0000
@@ -0,0 +1,15 @@
+#include "STM32F4_RNG.h"
+#include "mbed.h"
+
+
+STM32F4_RNG::STM32F4_RNG() {
+    RCC->AHB2ENR |= RCC_AHB2ENR_RNGEN;  /* Enable RNG clock source */
+    RNG->CR |= RNG_CR_RNGEN;            /* RNG Peripheral enable */
+}
+
+
+unsigned long STM32F4_RNG::Get() {
+    while (!(RNG->SR & (RNG_SR_DRDY))); /* Wait until one RNG number is ready */
+
+    return RNG->DR;                     /* Get a 32-bit Random number */
+}
\ No newline at end of file

diff -r 000000000000 -r 1c605984e361 STM32F4_RNG.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/STM32F4_RNG.h	Mon Feb 08 20:15:12 2016 +0000
@@ -0,0 +1,71 @@
+/* STM32F4_RNG Library v1.0
+ * Copyright (c) 2016 Grant Phillips
+ * grant.phillips@nmmu.ac.za
+ * 
+ * This library was adapted from tm_stm32f4_rng written by Tilen Majerle.
+ * (http://stm32f4-discovery.com/2014/07/library-22-true-random-number-generator-stm32f4xx/)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+ 
+#ifndef STM32F4_RNG_H
+#define STM32F4_RNG_H
+ 
+#include "mbed.h"
+
+/** Class library for using the true Random Number Generator on STM32F4xxx devices.
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "STM32F4_RNG.h"
+ * #include "SWO.h"
+ * 
+ * STM32F4_RNG rnd;
+ *
+ * int main() { 
+ *     // create a 32-bit unsigned variable
+ *     unsigned long num;   //or uint32_t num
+ *
+ *     while(1) {
+ *         num = rnd.Get();
+ *         printf("%u\n", num);
+ *         wait(1.0);
+ *     } 
+ * }
+ * @endcode
+ */
+ 
+class STM32F4_RNG {
+  public:
+    /** Create a STM32F4_RNG object.
+    *
+    */
+    STM32F4_RNG();
+    
+    /** Gets a 32-bit random number.
+    * @param 
+    *     None
+    * @return 
+    *     32-bit random number.
+    */
+    unsigned long Get();
+};
+ 
+#endif
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