| /* |
| |
| Copyright (c) 2009-2018 ARM Limited. All rights reserved. |
| |
| SPDX-License-Identifier: Apache-2.0 |
| |
| Licensed under the Apache License, Version 2.0 (the License); you may |
| not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an AS IS BASIS, WITHOUT |
| WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| |
| NOTICE: This file has been modified by Nordic Semiconductor ASA. |
| |
| */ |
| |
| /* NOTE: Template files (including this one) are application specific and therefore expected to |
| be copied into the application project folder prior to its use! */ |
| |
| #include <stdint.h> |
| #include <stdbool.h> |
| #include "nrf.h" |
| #include "system_nrf51.h" |
| |
| /*lint ++flb "Enter library region" */ |
| |
| |
| #define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */ |
| |
| static bool is_manual_peripheral_setup_needed(void); |
| static bool is_disabled_in_debug_needed(void); |
| static bool is_peripheral_domain_setup_needed(void); |
| |
| |
| #if defined ( __CC_ARM ) |
| uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; |
| #elif defined ( __ICCARM__ ) |
| __root uint32_t SystemCoreClock = __SYSTEM_CLOCK; |
| #elif defined ( __GNUC__ ) |
| uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; |
| #endif |
| |
| void SystemCoreClockUpdate(void) |
| { |
| SystemCoreClock = __SYSTEM_CLOCK; |
| } |
| |
| void SystemInit(void) |
| { |
| /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register. |
| It can also be done in the application main() function. */ |
| |
| /* Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required |
| to enable the use of peripherals" found at Product Anomaly document for your device found at |
| https://www.nordicsemi.com/. The side effect of executing these instructions in the devices |
| that do not need it is that the new peripherals in the second generation devices (LPCOMP for |
| example) will not be available. */ |
| if (is_manual_peripheral_setup_needed()) |
| { |
| *(uint32_t volatile *)0x40000504 = 0xC007FFDF; |
| *(uint32_t volatile *)0x40006C18 = 0x00008000; |
| } |
| |
| /* Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG |
| register is incorrect" found at Product Anomaly document for your device found at |
| https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. */ |
| if (is_disabled_in_debug_needed()) |
| { |
| NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos; |
| } |
| |
| /* Execute the following code to eliminate excessive current in sleep mode with RAM retention in nRF51802 devices, |
| as indicated by PAN 76 "System: Excessive current in sleep mode with retention" found at Product Anomaly document |
| for your device found at https://www.nordicsemi.com/. */ |
| if (is_peripheral_domain_setup_needed()){ |
| if (*(uint32_t volatile *)0x4006EC00 != 1){ |
| *(uint32_t volatile *)0x4006EC00 = 0x9375; |
| while (*(uint32_t volatile *)0x4006EC00 != 1){ |
| } |
| } |
| *(uint32_t volatile *)0x4006EC14 = 0xC0; |
| } |
| } |
| |
| |
| static bool is_manual_peripheral_setup_needed(void) |
| { |
| if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
| { |
| if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
| { |
| return true; |
| } |
| if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
| { |
| return true; |
| } |
| if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
| { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static bool is_disabled_in_debug_needed(void) |
| { |
| if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
| { |
| if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
| { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static bool is_peripheral_domain_setup_needed(void) |
| { |
| if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
| { |
| if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0xA0) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
| { |
| return true; |
| } |
| if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0xD0) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
| { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /*lint --flb "Leave library region" */ |