mbed library sources
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targets/cmsis/TARGET_NORDIC/TARGET_NRF51822/system_nrf51822.c@85:e1a8e879a6a9, 2014-02-07 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Feb 07 18:00:11 2014 +0000
- Revision:
- 85:e1a8e879a6a9
- Child:
- 104:a6a92e2e5a92
Synchronized with git revision 4b2b368a6a3b1f0fd33d99917981c67436c4aebe
Full URL: https://github.com/mbedmicro/mbed/commit/4b2b368a6a3b1f0fd33d99917981c67436c4aebe/
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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mbed_official | 85:e1a8e879a6a9 | 1 | /* mbed Microcontroller Library |
mbed_official | 85:e1a8e879a6a9 | 2 | |
mbed_official | 85:e1a8e879a6a9 | 3 | * Copyright (c) 2006-2013 ARM Limited |
mbed_official | 85:e1a8e879a6a9 | 4 | * |
mbed_official | 85:e1a8e879a6a9 | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 85:e1a8e879a6a9 | 6 | * you may not use this file except in compliance with the License. |
mbed_official | 85:e1a8e879a6a9 | 7 | * You may obtain a copy of the License at |
mbed_official | 85:e1a8e879a6a9 | 8 | * |
mbed_official | 85:e1a8e879a6a9 | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 85:e1a8e879a6a9 | 10 | * |
mbed_official | 85:e1a8e879a6a9 | 11 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 85:e1a8e879a6a9 | 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 85:e1a8e879a6a9 | 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 85:e1a8e879a6a9 | 14 | * See the License for the specific language governing permissions and |
mbed_official | 85:e1a8e879a6a9 | 15 | * limitations under the License. |
mbed_official | 85:e1a8e879a6a9 | 16 | */ |
mbed_official | 85:e1a8e879a6a9 | 17 | |
mbed_official | 85:e1a8e879a6a9 | 18 | |
mbed_official | 85:e1a8e879a6a9 | 19 | #include <stdint.h> |
mbed_official | 85:e1a8e879a6a9 | 20 | #include <stdbool.h> |
mbed_official | 85:e1a8e879a6a9 | 21 | #include "nrf51822.h" |
mbed_official | 85:e1a8e879a6a9 | 22 | #include "system_nrf51822.h" |
mbed_official | 85:e1a8e879a6a9 | 23 | |
mbed_official | 85:e1a8e879a6a9 | 24 | |
mbed_official | 85:e1a8e879a6a9 | 25 | #define __SYSTEM_CLOCK (16000000UL) //!< nRF51 devices use a fixed System Clock Frequency of 16MHz |
mbed_official | 85:e1a8e879a6a9 | 26 | |
mbed_official | 85:e1a8e879a6a9 | 27 | static bool is_manual_peripheral_setup_needed(void); |
mbed_official | 85:e1a8e879a6a9 | 28 | static bool is_disabled_in_debug_needed(void); |
mbed_official | 85:e1a8e879a6a9 | 29 | |
mbed_official | 85:e1a8e879a6a9 | 30 | |
mbed_official | 85:e1a8e879a6a9 | 31 | #if defined ( __CC_ARM ) |
mbed_official | 85:e1a8e879a6a9 | 32 | uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; |
mbed_official | 85:e1a8e879a6a9 | 33 | #elif defined ( __ICCARM__ ) |
mbed_official | 85:e1a8e879a6a9 | 34 | __root uint32_t SystemCoreClock = __SYSTEM_CLOCK; |
mbed_official | 85:e1a8e879a6a9 | 35 | #elif defined ( __GNUC__ ) |
mbed_official | 85:e1a8e879a6a9 | 36 | uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; |
mbed_official | 85:e1a8e879a6a9 | 37 | #endif |
mbed_official | 85:e1a8e879a6a9 | 38 | |
mbed_official | 85:e1a8e879a6a9 | 39 | |
mbed_official | 85:e1a8e879a6a9 | 40 | void SystemCoreClockUpdate(void) |
mbed_official | 85:e1a8e879a6a9 | 41 | { |
mbed_official | 85:e1a8e879a6a9 | 42 | SystemCoreClock = __SYSTEM_CLOCK; |
mbed_official | 85:e1a8e879a6a9 | 43 | } |
mbed_official | 85:e1a8e879a6a9 | 44 | |
mbed_official | 85:e1a8e879a6a9 | 45 | void SystemInit(void) |
mbed_official | 85:e1a8e879a6a9 | 46 | { |
mbed_official | 85:e1a8e879a6a9 | 47 | |
mbed_official | 85:e1a8e879a6a9 | 48 | //Write the necessary UICR and FWID values if needed |
mbed_official | 85:e1a8e879a6a9 | 49 | if (NRF_UICR->CLENR0 == 0xFFFFFFFF){ |
mbed_official | 85:e1a8e879a6a9 | 50 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos); |
mbed_official | 85:e1a8e879a6a9 | 51 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy){ |
mbed_official | 85:e1a8e879a6a9 | 52 | } |
mbed_official | 85:e1a8e879a6a9 | 53 | |
mbed_official | 85:e1a8e879a6a9 | 54 | NRF_UICR->CLENR0 = 0x14000; |
mbed_official | 85:e1a8e879a6a9 | 55 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy){ |
mbed_official | 85:e1a8e879a6a9 | 56 | } |
mbed_official | 85:e1a8e879a6a9 | 57 | |
mbed_official | 85:e1a8e879a6a9 | 58 | //write FWID (NRF_UICR->FWID is readonly) |
mbed_official | 85:e1a8e879a6a9 | 59 | *(uint32_t *)0x10001010 = 0xFFFF0049; |
mbed_official | 85:e1a8e879a6a9 | 60 | |
mbed_official | 85:e1a8e879a6a9 | 61 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy){ |
mbed_official | 85:e1a8e879a6a9 | 62 | } |
mbed_official | 85:e1a8e879a6a9 | 63 | |
mbed_official | 85:e1a8e879a6a9 | 64 | NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos); |
mbed_official | 85:e1a8e879a6a9 | 65 | while (NRF_NVMC->READY == NVMC_READY_READY_Busy){ |
mbed_official | 85:e1a8e879a6a9 | 66 | } |
mbed_official | 85:e1a8e879a6a9 | 67 | |
mbed_official | 85:e1a8e879a6a9 | 68 | NVIC_SystemReset(); |
mbed_official | 85:e1a8e879a6a9 | 69 | while (true){ |
mbed_official | 85:e1a8e879a6a9 | 70 | } |
mbed_official | 85:e1a8e879a6a9 | 71 | } |
mbed_official | 85:e1a8e879a6a9 | 72 | |
mbed_official | 85:e1a8e879a6a9 | 73 | // Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required |
mbed_official | 85:e1a8e879a6a9 | 74 | // to enable the use of peripherals" found at Product Anomaly document for your device found at |
mbed_official | 85:e1a8e879a6a9 | 75 | // https://www.nordicsemi.com/. The side effect of executing these instructions in the devices |
mbed_official | 85:e1a8e879a6a9 | 76 | // that do not need it is that the new peripherals in the second generation devices (LPCOMP for |
mbed_official | 85:e1a8e879a6a9 | 77 | // example) will not be available. |
mbed_official | 85:e1a8e879a6a9 | 78 | |
mbed_official | 85:e1a8e879a6a9 | 79 | if (is_manual_peripheral_setup_needed()){ |
mbed_official | 85:e1a8e879a6a9 | 80 | *(uint32_t volatile *)0x40000504 = 0xC007FFDF; |
mbed_official | 85:e1a8e879a6a9 | 81 | *(uint32_t volatile *)0x40006C18 = 0x00008000; |
mbed_official | 85:e1a8e879a6a9 | 82 | } |
mbed_official | 85:e1a8e879a6a9 | 83 | |
mbed_official | 85:e1a8e879a6a9 | 84 | // Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG |
mbed_official | 85:e1a8e879a6a9 | 85 | // register is incorrect" found at Product Anomaly document four your device found at |
mbed_official | 85:e1a8e879a6a9 | 86 | // https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. |
mbed_official | 85:e1a8e879a6a9 | 87 | if (is_disabled_in_debug_needed()){ |
mbed_official | 85:e1a8e879a6a9 | 88 | NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos; |
mbed_official | 85:e1a8e879a6a9 | 89 | } |
mbed_official | 85:e1a8e879a6a9 | 90 | |
mbed_official | 85:e1a8e879a6a9 | 91 | // Start 16 MHz crystal oscillator. |
mbed_official | 85:e1a8e879a6a9 | 92 | NRF_CLOCK->EVENTS_HFCLKSTARTED = 0; |
mbed_official | 85:e1a8e879a6a9 | 93 | NRF_CLOCK->TASKS_HFCLKSTART = 1; |
mbed_official | 85:e1a8e879a6a9 | 94 | |
mbed_official | 85:e1a8e879a6a9 | 95 | // Wait for the external oscillator to start up. |
mbed_official | 85:e1a8e879a6a9 | 96 | while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0) { |
mbed_official | 85:e1a8e879a6a9 | 97 | // Do nothing. |
mbed_official | 85:e1a8e879a6a9 | 98 | } |
mbed_official | 85:e1a8e879a6a9 | 99 | } |
mbed_official | 85:e1a8e879a6a9 | 100 | |
mbed_official | 85:e1a8e879a6a9 | 101 | static bool is_manual_peripheral_setup_needed(void) |
mbed_official | 85:e1a8e879a6a9 | 102 | { |
mbed_official | 85:e1a8e879a6a9 | 103 | if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 104 | { |
mbed_official | 85:e1a8e879a6a9 | 105 | if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 106 | { |
mbed_official | 85:e1a8e879a6a9 | 107 | return true; |
mbed_official | 85:e1a8e879a6a9 | 108 | } |
mbed_official | 85:e1a8e879a6a9 | 109 | if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 110 | { |
mbed_official | 85:e1a8e879a6a9 | 111 | return true; |
mbed_official | 85:e1a8e879a6a9 | 112 | } |
mbed_official | 85:e1a8e879a6a9 | 113 | if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 114 | { |
mbed_official | 85:e1a8e879a6a9 | 115 | return true; |
mbed_official | 85:e1a8e879a6a9 | 116 | } |
mbed_official | 85:e1a8e879a6a9 | 117 | } |
mbed_official | 85:e1a8e879a6a9 | 118 | |
mbed_official | 85:e1a8e879a6a9 | 119 | return false; |
mbed_official | 85:e1a8e879a6a9 | 120 | } |
mbed_official | 85:e1a8e879a6a9 | 121 | |
mbed_official | 85:e1a8e879a6a9 | 122 | static bool is_disabled_in_debug_needed(void) |
mbed_official | 85:e1a8e879a6a9 | 123 | { |
mbed_official | 85:e1a8e879a6a9 | 124 | if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 125 | { |
mbed_official | 85:e1a8e879a6a9 | 126 | if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 127 | { |
mbed_official | 85:e1a8e879a6a9 | 128 | return true; |
mbed_official | 85:e1a8e879a6a9 | 129 | } |
mbed_official | 85:e1a8e879a6a9 | 130 | } |
mbed_official | 85:e1a8e879a6a9 | 131 | |
mbed_official | 85:e1a8e879a6a9 | 132 | return false; |
mbed_official | 85:e1a8e879a6a9 | 133 | } |
mbed_official | 85:e1a8e879a6a9 | 134 |