Merge pull request #6 from gebart/pr/kinetis-rngb

Kinetis RNGB implementation
jnohlgard · Jan 12, 2015 · 6cddfe0 · 6cddfe0
2 parents bdf1abe + 67e3306
commit 6cddfe0
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Showing 2 changed files with 99 additions and 6 deletions.
diff --git a/cpu/kinetis_common/random_rnga.c b/cpu/kinetis_common/random_rnga.c
@@ -28,6 +28,8 @@
 #include "periph_conf.h"
 
 #if RANDOM_NUMOF
+#ifdef KINETIS_RNGA
+
 
 typedef struct RNG_MemMap {
     uint32_t CR;
@@ -66,15 +68,15 @@ int random_read(char *buf, unsigned int num)
     int count = 0;
 
     /* self-seeding */
-    while (!(RNGA->SR & RNGA_SR_OREG_LVL_MASK));
+    while (!(KINETIS_RNGA->SR & RNG_SR_OREG_LVL_MASK));
 
-    RNGA->ER = RNGA->OR ^ (uint32_t)buf;
+    KINETIS_RNGA->ER = KINETIS_RNGA->OR ^ (uint32_t)buf;
 
     while (count < num) {
         /* wait for random data to be ready to read */
-        while (!(RNGA->SR & RNGA_SR_OREG_LVL_MASK));
+        while (!(KINETIS_RNGA->SR & RNG_SR_OREG_LVL_MASK));
 
-        tmp = RNGA->OR;
+        tmp = KINETIS_RNGA->OR;
 
         /* copy data into result vector */
         for (int i = 0; i < 4 && count < num; i++) {
@@ -89,12 +91,12 @@ int random_read(char *buf, unsigned int num)
 void random_poweron(void)
 {
     RANDOM_CLKEN();
-    RNGA->CR = RNGA_CR_INTM_MASK | RNGA_CR_HA_MASK | RNGA_CR_GO_MASK;
+    KINETIS_RNGA->CR = RNG_CR_INTM_MASK | RNG_CR_HA_MASK | RNG_CR_GO_MASK;
 }
 
 void random_poweroff(void)
 {
-    RNGA->CR = 0;
+    KINETIS_RNGA->CR = 0;
     RANDOM_CLKDIS();
 }
 
@@ -104,4 +106,5 @@ void isr_rng(void)
 }
 */
 
+#endif /* KINETIS_RNGA */
 #endif /* RANDOM_NUMOF */
diff --git a/cpu/kinetis_common/random_rngb.c b/cpu/kinetis_common/random_rngb.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2014 Freie Universität Berlin
+ * Copyright (C) 2014 PHYTEC Messtechnik GmbH
+ * Copyright (C) 2015 Eistec AB
+ *
+ * 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_kinetis_common
+ * @{
+ *
+ * @file
+ * @brief       Low-level random number generator driver implementation.
+ *              Driver for Freescale's RNGB module. RNGB generates data that
+ *              looks random. Reference Manual recommends to use the RNGB as entropy
+ *              source.
+ *
+ * @author      Joakim Gebart <joakim.gebart@eistec.se> (adaption for Freescale's RNGB)
+ * @author      Johann Fischer <j.fischer@phytec.de> (adaption for Freescale's RNGA)
+ * @author      Hauke Petersen <mail@haukepetersen.de>
+ *
+ * @}
+ */
+
+#include "cpu.h"
+#include "periph/random.h"
+#include "periph_conf.h"
+
+#if RANDOM_NUMOF
+#ifdef KINETIS_RNGB
+
+
+void random_init(void)
+{
+    random_poweron();
+}
+
+int random_read(char *buf, unsigned int num)
+{
+    int count = 0;
+
+    while (count < num) {
+        uint32_t tmp;
+        /* wait for random data to be ready to read */
+        while (!(KINETIS_RNGB->SR & RNG_SR_FIFO_LVL_MASK));
+
+        tmp = KINETIS_RNGB->OUT;
+
+        /* 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)
+{
+    RANDOM_CLKEN();
+    if ((KINETIS_RNGB->VER & RNG_VER_TYPE_MASK) != 0b0001)
+    {
+        /* Wrong type of RNG */
+        /* TODO: Handle */
+    }
+
+    /* Software reset, bit is self-clearing */
+    BITBAND_REG(KINETIS_RNGB->CMD, RNG_CMD_SR_SHIFT) = 1;
+    /* Set up automatic reseed */
+    KINETIS_RNGB->CR = RNG_CR_AR_MASK | RNG_CR_MASKERR_MASK | RNG_CR_MASKDONE_MASK;
+}
+
+void random_poweroff(void)
+{
+    KINETIS_RNGB->CR = 0;
+    RANDOM_CLKDIS();
+}
+
+/*
+void isr_rng(void)
+{
+}
+*/
+
+#endif /* KINETIS_RNGB */
+#endif /* RANDOM_NUMOF */