152 lines
5.8 KiB
C
152 lines
5.8 KiB
C
/* Copyright (c) 2012 ARM LIMITED
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of ARM nor the names of its contributors may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/* NOTE: Template files (including this one) are application specific and therefore expected to
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be copied into the application project folder prior to its use! */
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#include <stdint.h>
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#include <stdbool.h>
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#include "nrf.h"
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#include "system_nrf51.h"
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/*lint ++flb "Enter library region" */
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#define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */
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static bool is_manual_peripheral_setup_needed(void);
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static bool is_disabled_in_debug_needed(void);
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static bool is_peripheral_domain_setup_needed(void);
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#if defined ( __CC_ARM )
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uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
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#elif defined ( __ICCARM__ )
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__root uint32_t SystemCoreClock = __SYSTEM_CLOCK;
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#elif defined ( __GNUC__ )
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uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
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#endif
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void SystemCoreClockUpdate(void)
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{
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SystemCoreClock = __SYSTEM_CLOCK;
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}
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void SystemInit(void)
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{
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/* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
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It can also be done in the application main() function. */
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/* Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
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to enable the use of peripherals" found at Product Anomaly document for your device found at
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https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
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that do not need it is that the new peripherals in the second generation devices (LPCOMP for
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example) will not be available. */
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if (is_manual_peripheral_setup_needed())
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{
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*(uint32_t volatile *)0x40000504 = 0xC007FFDF;
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*(uint32_t volatile *)0x40006C18 = 0x00008000;
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}
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/* Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
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register is incorrect" found at Product Anomaly document for your device found at
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https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. */
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if (is_disabled_in_debug_needed())
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{
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NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
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}
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/* Execute the following code to eliminate excessive current in sleep mode with RAM retention in nRF51802 devices,
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as indicated by PAN 76 "System: Excessive current in sleep mode with retention" found at Product Anomaly document
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for your device found at https://www.nordicsemi.com/. */
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if (is_peripheral_domain_setup_needed()){
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if (*(uint32_t volatile *)0x4006EC00 != 1){
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*(uint32_t volatile *)0x4006EC00 = 0x9375;
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while (*(uint32_t volatile *)0x4006EC00 != 1){
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}
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}
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*(uint32_t volatile *)0x4006EC14 = 0xC0;
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}
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}
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static bool is_manual_peripheral_setup_needed(void)
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{
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if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
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{
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
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{
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return true;
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}
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
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{
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return true;
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}
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
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{
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return true;
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}
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}
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return false;
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}
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static bool is_disabled_in_debug_needed(void)
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{
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if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
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{
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
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{
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return true;
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}
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}
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return false;
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}
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static bool is_peripheral_domain_setup_needed(void)
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{
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if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
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{
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0xA0) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
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{
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return true;
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}
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0xD0) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
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{
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return true;
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}
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}
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return false;
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}
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/*lint --flb "Leave library region" */
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