1 files changed, 114 insertions, 0 deletions
diff --git a/cc3200/util/random.c b/cc3200/util/random.c
new file mode 100644
index 0000000000..be6400def5
--- /dev/null
+++ b/cc3200/util/random.c
@@ -0,0 +1,114 @@
+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 Daniel Campora
+ *
+ * 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.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "inc/hw_types.h"
+#include "inc/hw_ints.h"
+#include "inc/hw_memmap.h"
+#include "rom_map.h"
+#include "prcm.h"
+#include "simplelink.h"
+#include "modwlan.h"
+#include "py/obj.h"
+#include "random.h"
+
+
+/******************************************************************************
+* LOCAL TYPES
+******************************************************************************/
+typedef union Id_t {
+    uint32_t       id32;
+    uint16_t       id16[3];
+    uint8_t        id8[6];
+} Id_t;
+
+/******************************************************************************
+* LOCAL VARIABLES
+******************************************************************************/
+static uint32_t s_seed;
+
+/******************************************************************************
+* LOCAL FUNCTION DECLARATIONS
+******************************************************************************/
+static uint32_t lfsr (uint32_t input);
+
+/******************************************************************************
+* PRIVATE FUNCTIONS
+******************************************************************************/
+static uint32_t lfsr (uint32_t input) {
+    assert( input != 0 );
+
+    /*lint -save -e501*/
+    return (input >> 1) ^ (-(input & 0x01) & 0x00E10000);
+    /*lint -restore*/
+}
+
+#if MICROPY_HW_ENABLE_RNG
+/// \moduleref rng
+
+/// \function rng()
+/// Return a 24-bit hardware generated random number.
+STATIC mp_obj_t pyb_rng_get(void) {
+    return mp_obj_new_int(rng_get());
+}
+
+MP_DEFINE_CONST_FUN_OBJ_0(pyb_rng_get_obj, pyb_rng_get);
+#endif
+
+/******************************************************************************
+* PUBLIC FUNCTIONS
+******************************************************************************/
+void rng_init0 (void) {
+    Id_t juggler;
+    uint32_t seconds;
+    uint16_t mseconds;
+
+    // get the seconds and the milliseconds from the RTC
+    MAP_PRCMRTCGet(&seconds, &mseconds);
+
+    wlan_get_mac (juggler.id8);
+
+    // Flatten the 48-bit board identification to 24 bits
+    juggler.id16[0] ^= juggler.id16[2];
+
+    juggler.id8[0]  ^= juggler.id8[3];
+    juggler.id8[1]  ^= juggler.id8[4];
+    juggler.id8[2]  ^= juggler.id8[5];
+
+    s_seed = juggler.id32 & 0x00FFFFFF;
+    s_seed += (seconds & 0x000FFFFF) + mseconds;
+    // The seed must not be zero
+    if (s_seed == 0) {
+        s_seed = 1;
+    }
+}
+
+uint32_t rng_get (void) {
+    s_seed = lfsr( s_seed );
+    return s_seed;
+}