Diff: btle_addr.c

Revision:

0:f71931ae3db1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/btle_addr.c	Fri Jul 10 21:28:56 2015 +0000
@@ -0,0 +1,122 @@
+/*******************************************************************************
+ * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * 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 MAXIM INTEGRATED 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.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *******************************************************************************
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include "cmsis.h"
+#include "clkman_regs.h"
+#include "tpu_regs.h"
+#include "flc_regs.h"
+
+#define BTLE_ADDR_ADDRESS       (MXC_FLASH_MEM_BASE + MXC_FLASH_MEM_SIZE - 8)
+#define FLC_CTRL_UNLOCK_VALUE   0x20000000UL
+
+static void getRandAddress(uint32_t address[2])
+{
+    uint32_t clk_config_save = MXC_CLKMAN->clk_config;
+    uint32_t clk_ctrl_10_prng_save = MXC_CLKMAN->clk_ctrl_10_prng;
+    uint32_t crypt_clk_ctrl_2_prng_save = MXC_CLKMAN->crypt_clk_ctrl_2_prng;
+    uint32_t clk_ctrl_save = MXC_CLKMAN->clk_ctrl;
+    uint16_t *ptr = (uint16_t*)address;
+
+    // Enable the crypto RO if necessary
+    if (!(MXC_CLKMAN->clk_config & MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_ENABLE)) {
+        uint32_t temp = MXC_CLKMAN->clk_config;
+        temp &= ~MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_STABILITY_COUNT;
+        temp |= (MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_RESET_N |
+                 MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_ENABLE |
+                (MXC_E_CLKMAN_STABILITY_COUNT_2_8_CLKS << MXC_F_CLKMAN_CLK_CONFIG_CRYPTO_STABILITY_COUNT_POS));
+        MXC_CLKMAN->clk_config = temp;
+    }
+
+    // Un-gate crypto RO if necessary
+    if (!(MXC_CLKMAN->clk_ctrl & MXC_F_CLKMAN_CLK_CTRL_CRYPTO_GATE_N)) {
+        MXC_CLKMAN->clk_ctrl |= MXC_F_CLKMAN_CLK_CTRL_CRYPTO_GATE_N;
+    }
+
+    // Enable clock if necessary
+    if (MXC_CLKMAN->clk_ctrl_10_prng == MXC_E_CLKMAN_CLK_SCALE_DISABLED) {
+        MXC_CLKMAN->clk_ctrl_10_prng = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
+    }
+
+    // Enable clock if necessary
+    if (MXC_CLKMAN->crypt_clk_ctrl_2_prng == MXC_E_CLKMAN_CLK_SCALE_DISABLED) {
+        MXC_CLKMAN->crypt_clk_ctrl_2_prng = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
+    }
+
+    ptr[0] = MXC_TPU->prng_rnd_num;
+    ptr[1] = MXC_TPU->prng_rnd_num;
+    ptr[2] = MXC_TPU->prng_rnd_num;
+    ptr[3] = MXC_TPU->prng_rnd_num;
+
+    // Restore clock settings
+    MXC_CLKMAN->crypt_clk_ctrl_2_prng = crypt_clk_ctrl_2_prng_save;
+    MXC_CLKMAN->clk_ctrl_10_prng = clk_ctrl_10_prng_save;
+    MXC_CLKMAN->clk_ctrl = clk_ctrl_save;
+    MXC_CLKMAN->clk_config = clk_config_save;
+}
+
+void getBtleAddress(uint8_t *bdAddr)
+{
+    uint32_t *ptr;
+    uint32_t flash_value[2];
+
+    ptr = (uint32_t*)BTLE_ADDR_ADDRESS;
+
+    // Check if there is already an address written to flash
+    if ((ptr[0] == 0xFFFFFFFF) && (ptr[1] == 0xFFFFFFFF)) {
+
+        // Get a random numbers for the address
+        getRandAddress(flash_value);
+
+        // Set bits to indicate random static address
+        flash_value[1] |= 0xFFFFC000;
+
+        // Write the number to flash
+        MXC_FLC->ctrl = (MXC_FLC->ctrl & ~MXC_F_FLC_CTRL_FLSH_UNLOCK) | FLC_CTRL_UNLOCK_VALUE;
+
+        MXC_FLC->faddr = BTLE_ADDR_ADDRESS;
+        MXC_FLC->fdata = flash_value[0];
+        MXC_FLC->ctrl |= MXC_F_FLC_CTRL_WRITE;
+        while (MXC_FLC->ctrl & MXC_F_FLC_CTRL_PENDING);
+
+        MXC_FLC->faddr = BTLE_ADDR_ADDRESS + 4;
+        MXC_FLC->fdata = flash_value[1];
+        MXC_FLC->ctrl |= MXC_F_FLC_CTRL_WRITE;
+        while (MXC_FLC->ctrl & MXC_F_FLC_CTRL_PENDING);
+
+        MXC_FLC->ctrl &= ~MXC_F_FLC_CTRL_FLSH_UNLOCK;
+    }
+
+    memcpy(bdAddr, (uint32_t*)BTLE_ADDR_ADDRESS, 6);
+}