1 /* 2 3 Copyright (c) 2009-2018 ARM Limited. All rights reserved. 4 5 SPDX-License-Identifier: Apache-2.0 6 7 Licensed under the Apache License, Version 2.0 (the License); you may 8 not use this file except in compliance with the License. 9 You may obtain a copy of the License at 10 11 www.apache.org/licenses/LICENSE-2.0 12 13 Unless required by applicable law or agreed to in writing, software 14 distributed under the License is distributed on an AS IS BASIS, WITHOUT 15 WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 See the License for the specific language governing permissions and 17 limitations under the License. 18 19 NOTICE: This file has been modified by Nordic Semiconductor ASA. 20 21 */ 22 23 /* NOTE: Template files (including this one) are application specific and therefore expected to 24 be copied into the application project folder prior to its use! */ 25 26 #include <stdint.h> 27 #include <stdbool.h> 28 #include "nrf.h" 29 #include "system_nrf51.h" 30 31 /*lint ++flb "Enter library region" */ 32 33 34 #define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */ 35 36 static bool is_manual_peripheral_setup_needed(void); 37 static bool is_disabled_in_debug_needed(void); 38 static bool is_peripheral_domain_setup_needed(void); 39 40 41 #if defined ( __CC_ARM ) 42 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; 43 #elif defined ( __ICCARM__ ) 44 __root uint32_t SystemCoreClock = __SYSTEM_CLOCK; 45 #elif defined ( __GNUC__ ) 46 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; 47 #endif 48 SystemCoreClockUpdate(void)49void SystemCoreClockUpdate(void) 50 { 51 SystemCoreClock = __SYSTEM_CLOCK; 52 } 53 SystemInit(void)54void SystemInit(void) 55 { 56 /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register. 57 It can also be done in the application main() function. */ 58 59 /* Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required 60 to enable the use of peripherals" found at Product Anomaly document for your device found at 61 https://www.nordicsemi.com/. The side effect of executing these instructions in the devices 62 that do not need it is that the new peripherals in the second generation devices (LPCOMP for 63 example) will not be available. */ 64 if (is_manual_peripheral_setup_needed()) 65 { 66 *(uint32_t volatile *)0x40000504 = 0xC007FFDF; 67 *(uint32_t volatile *)0x40006C18 = 0x00008000; 68 } 69 70 /* Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG 71 register is incorrect" found at Product Anomaly document for your device found at 72 https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. */ 73 if (is_disabled_in_debug_needed()) 74 { 75 NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos; 76 } 77 78 /* Execute the following code to eliminate excessive current in sleep mode with RAM retention in nRF51802 devices, 79 as indicated by PAN 76 "System: Excessive current in sleep mode with retention" found at Product Anomaly document 80 for your device found at https://www.nordicsemi.com/. */ 81 if (is_peripheral_domain_setup_needed()){ 82 if (*(uint32_t volatile *)0x4006EC00 != 1){ 83 *(uint32_t volatile *)0x4006EC00 = 0x9375; 84 while (*(uint32_t volatile *)0x4006EC00 != 1){ 85 } 86 } 87 *(uint32_t volatile *)0x4006EC14 = 0xC0; 88 } 89 } 90 91 is_manual_peripheral_setup_needed(void)92static bool is_manual_peripheral_setup_needed(void) 93 { 94 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) 95 { 96 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) 97 { 98 return true; 99 } 100 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) 101 { 102 return true; 103 } 104 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) 105 { 106 return true; 107 } 108 } 109 110 return false; 111 } 112 is_disabled_in_debug_needed(void)113static bool is_disabled_in_debug_needed(void) 114 { 115 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) 116 { 117 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) 118 { 119 return true; 120 } 121 } 122 123 return false; 124 } 125 is_peripheral_domain_setup_needed(void)126static bool is_peripheral_domain_setup_needed(void) 127 { 128 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) 129 { 130 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0xA0) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) 131 { 132 return true; 133 } 134 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0xD0) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) 135 { 136 return true; 137 } 138 } 139 140 return false; 141 } 142 143 /*lint --flb "Leave library region" */ 144