Ken Todotani / mbed-src

mbed library sources

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targets/cmsis/TARGET_NORDIC/TARGET_NRF51822/system_nrf51822.c@104:a6a92e2e5a92, 2014-02-21 (annotated)

Committer:
mbed_official
Date:
Fri Feb 21 12:15:10 2014 +0000
Revision:
104:a6a92e2e5a92
Parent:
85:e1a8e879a6a9
Child:
127:ce7cebc0511f
Synchronized with git revision 195a50befc6da080be0051d0d9bc0838f6cb873e



Full URL: https://github.com/mbedmicro/mbed/commit/195a50befc6da080be0051d0d9bc0838f6cb873e/



nrf-mbed merge

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mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 85:e1a8e879a6a9 2
mbed_official 104:a6a92e2e5a92 3 * Copyright (c) 2013 Nordic Semiconductor.
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 104:a6a92e2e5a92 46 {
mbed_official 104:a6a92e2e5a92 47 NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos);
mbed_official 104:a6a92e2e5a92 48 while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
mbed_official 104:a6a92e2e5a92 49 }
mbed_official 104:a6a92e2e5a92 50 //write FWID (NRF_UICR->FWID is readonly)
mbed_official 104:a6a92e2e5a92 51 *(uint32_t *)0x10001010 = 0xFFFF0049;
mbed_official 85:e1a8e879a6a9 52
mbed_official 104:a6a92e2e5a92 53 while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
mbed_official 85:e1a8e879a6a9 54 }
mbed_official 104:a6a92e2e5a92 55
mbed_official 104:a6a92e2e5a92 56 NRF_NVMC->CONFIG = (NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos);
mbed_official 104:a6a92e2e5a92 57 while (NRF_NVMC->READY == NVMC_READY_READY_Busy){
mbed_official 104:a6a92e2e5a92 58 }
mbed_official 85:e1a8e879a6a9 59 // Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
mbed_official 85:e1a8e879a6a9 60 // to enable the use of peripherals" found at Product Anomaly document for your device found at
mbed_official 85:e1a8e879a6a9 61 // https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
mbed_official 85:e1a8e879a6a9 62 // that do not need it is that the new peripherals in the second generation devices (LPCOMP for
mbed_official 85:e1a8e879a6a9 63 // example) will not be available.
mbed_official 85:e1a8e879a6a9 64
mbed_official 85:e1a8e879a6a9 65 if (is_manual_peripheral_setup_needed()){
mbed_official 85:e1a8e879a6a9 66 *(uint32_t volatile *)0x40000504 = 0xC007FFDF;
mbed_official 85:e1a8e879a6a9 67 *(uint32_t volatile *)0x40006C18 = 0x00008000;
mbed_official 85:e1a8e879a6a9 68 }
mbed_official 85:e1a8e879a6a9 69
mbed_official 85:e1a8e879a6a9 70 // Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
mbed_official 85:e1a8e879a6a9 71 // register is incorrect" found at Product Anomaly document four your device found at
mbed_official 85:e1a8e879a6a9 72 // https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed.
mbed_official 85:e1a8e879a6a9 73 if (is_disabled_in_debug_needed()){
mbed_official 85:e1a8e879a6a9 74 NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
mbed_official 85:e1a8e879a6a9 75 }
mbed_official 85:e1a8e879a6a9 76
mbed_official 85:e1a8e879a6a9 77 // Start 16 MHz crystal oscillator.
mbed_official 85:e1a8e879a6a9 78 NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
mbed_official 85:e1a8e879a6a9 79 NRF_CLOCK->TASKS_HFCLKSTART = 1;
mbed_official 85:e1a8e879a6a9 80
mbed_official 85:e1a8e879a6a9 81 // Wait for the external oscillator to start up.
mbed_official 85:e1a8e879a6a9 82 while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0) {
mbed_official 85:e1a8e879a6a9 83 // Do nothing.
mbed_official 85:e1a8e879a6a9 84 }
mbed_official 85:e1a8e879a6a9 85 }
mbed_official 85:e1a8e879a6a9 86
mbed_official 85:e1a8e879a6a9 87 static bool is_manual_peripheral_setup_needed(void)
mbed_official 85:e1a8e879a6a9 88 {
mbed_official 85:e1a8e879a6a9 89 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 90 {
mbed_official 85:e1a8e879a6a9 91 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 92 {
mbed_official 85:e1a8e879a6a9 93 return true;
mbed_official 85:e1a8e879a6a9 94 }
mbed_official 85:e1a8e879a6a9 95 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 96 {
mbed_official 85:e1a8e879a6a9 97 return true;
mbed_official 85:e1a8e879a6a9 98 }
mbed_official 85:e1a8e879a6a9 99 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 100 {
mbed_official 85:e1a8e879a6a9 101 return true;
mbed_official 85:e1a8e879a6a9 102 }
mbed_official 85:e1a8e879a6a9 103 }
mbed_official 85:e1a8e879a6a9 104
mbed_official 85:e1a8e879a6a9 105 return false;
mbed_official 85:e1a8e879a6a9 106 }
mbed_official 85:e1a8e879a6a9 107
mbed_official 85:e1a8e879a6a9 108 static bool is_disabled_in_debug_needed(void)
mbed_official 85:e1a8e879a6a9 109 {
mbed_official 85:e1a8e879a6a9 110 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 111 {
mbed_official 85:e1a8e879a6a9 112 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 113 {
mbed_official 85:e1a8e879a6a9 114 return true;
mbed_official 85:e1a8e879a6a9 115 }
mbed_official 85:e1a8e879a6a9 116 }
mbed_official 85:e1a8e879a6a9 117
mbed_official 85:e1a8e879a6a9 118 return false;
mbed_official 85:e1a8e879a6a9 119 }
mbed_official 85:e1a8e879a6a9 120