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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/system_nrf51822.c@459:397407b8d9f7, 2015-02-02 (annotated)

Committer:
mbed_official
Date:
Mon Feb 02 07:30:07 2015 +0000
Revision:
459:397407b8d9f7
Parent:
308:29bf8b44dbf6
Child:
466:12a9a5f8fea0
Synchronized with git revision 9f80c904774a5f24198502d615ba9978c26616ab



Full URL: https://github.com/mbedmicro/mbed/commit/9f80c904774a5f24198502d615ba9978c26616ab/



Add a new target DELTA_DFCM_NNN40

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 85:e1a8e879a6a9 1 /* mbed Microcontroller Library
mbed_official 85:e1a8e879a6a9 2
mbed_official 459:397407b8d9f7 3 * Copyright (c) 2015 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 459:397407b8d9f7 24 #ifdef TARGET_DELTA_DFCM_NNN40
mbed_official 85:e1a8e879a6a9 25
mbed_official 459:397407b8d9f7 26 #define __SYSTEM_CLOCK (32000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 32MHz */
mbed_official 459:397407b8d9f7 27 #else
mbed_official 459:397407b8d9f7 28 #define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */
mbed_official 459:397407b8d9f7 29 #endif
mbed_official 85:e1a8e879a6a9 30
mbed_official 85:e1a8e879a6a9 31 static bool is_manual_peripheral_setup_needed(void);
mbed_official 85:e1a8e879a6a9 32 static bool is_disabled_in_debug_needed(void);
mbed_official 85:e1a8e879a6a9 33
mbed_official 85:e1a8e879a6a9 34
mbed_official 85:e1a8e879a6a9 35 #if defined ( __CC_ARM )
mbed_official 304:89b9c3a9a045 36 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 37 #elif defined ( __ICCARM__ )
mbed_official 85:e1a8e879a6a9 38 __root uint32_t SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 39 #elif defined ( __GNUC__ )
mbed_official 85:e1a8e879a6a9 40 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 41 #endif
mbed_official 85:e1a8e879a6a9 42
mbed_official 85:e1a8e879a6a9 43 void SystemCoreClockUpdate(void)
mbed_official 85:e1a8e879a6a9 44 {
mbed_official 85:e1a8e879a6a9 45 SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 46 }
mbed_official 85:e1a8e879a6a9 47
mbed_official 85:e1a8e879a6a9 48 void SystemInit(void)
mbed_official 304:89b9c3a9a045 49 {
mbed_official 306:d33324c3b5a2 50 /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
mbed_official 306:d33324c3b5a2 51 It can also be done in the application main() function. */
mbed_official 306:d33324c3b5a2 52
mbed_official 85:e1a8e879a6a9 53 // Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
mbed_official 85:e1a8e879a6a9 54 // to enable the use of peripherals" found at Product Anomaly document for your device found at
mbed_official 304:89b9c3a9a045 55 // https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
mbed_official 85:e1a8e879a6a9 56 // that do not need it is that the new peripherals in the second generation devices (LPCOMP for
mbed_official 85:e1a8e879a6a9 57 // example) will not be available.
mbed_official 306:d33324c3b5a2 58 if (is_manual_peripheral_setup_needed())
mbed_official 306:d33324c3b5a2 59 {
mbed_official 85:e1a8e879a6a9 60 *(uint32_t volatile *)0x40000504 = 0xC007FFDF;
mbed_official 85:e1a8e879a6a9 61 *(uint32_t volatile *)0x40006C18 = 0x00008000;
mbed_official 85:e1a8e879a6a9 62 }
mbed_official 304:89b9c3a9a045 63
mbed_official 85:e1a8e879a6a9 64 // Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
mbed_official 304:89b9c3a9a045 65 // register is incorrect" found at Product Anomaly document four your device found at
mbed_official 304:89b9c3a9a045 66 // https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed.
mbed_official 306:d33324c3b5a2 67 if (is_disabled_in_debug_needed())
mbed_official 306:d33324c3b5a2 68 {
mbed_official 85:e1a8e879a6a9 69 NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
mbed_official 85:e1a8e879a6a9 70 }
mbed_official 304:89b9c3a9a045 71
mbed_official 304:89b9c3a9a045 72 // Start the external 32khz crystal oscillator.
mbed_official 308:29bf8b44dbf6 73
mbed_official 459:397407b8d9f7 74 #ifdef TARGET_DELTA_DFCM_NNN40 || TARGET_HRM1017
mbed_official 308:29bf8b44dbf6 75 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 308:29bf8b44dbf6 76 #else
mbed_official 304:89b9c3a9a045 77 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 308:29bf8b44dbf6 78 #endif
mbed_official 304:89b9c3a9a045 79 NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
mbed_official 304:89b9c3a9a045 80 NRF_CLOCK->TASKS_LFCLKSTART = 1;
mbed_official 85:e1a8e879a6a9 81
mbed_official 85:e1a8e879a6a9 82 // Wait for the external oscillator to start up.
mbed_official 304:89b9c3a9a045 83 while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) {
mbed_official 85:e1a8e879a6a9 84 // Do nothing.
mbed_official 85:e1a8e879a6a9 85 }
mbed_official 85:e1a8e879a6a9 86 }
mbed_official 85:e1a8e879a6a9 87
mbed_official 304:89b9c3a9a045 88 static bool is_manual_peripheral_setup_needed(void)
mbed_official 85:e1a8e879a6a9 89 {
mbed_official 85:e1a8e879a6a9 90 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 91 {
mbed_official 85:e1a8e879a6a9 92 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 93 {
mbed_official 85:e1a8e879a6a9 94 return true;
mbed_official 85:e1a8e879a6a9 95 }
mbed_official 85:e1a8e879a6a9 96 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 97 {
mbed_official 85:e1a8e879a6a9 98 return true;
mbed_official 85:e1a8e879a6a9 99 }
mbed_official 85:e1a8e879a6a9 100 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 101 {
mbed_official 85:e1a8e879a6a9 102 return true;
mbed_official 85:e1a8e879a6a9 103 }
mbed_official 85:e1a8e879a6a9 104 }
mbed_official 304:89b9c3a9a045 105
mbed_official 85:e1a8e879a6a9 106 return false;
mbed_official 85:e1a8e879a6a9 107 }
mbed_official 85:e1a8e879a6a9 108
mbed_official 304:89b9c3a9a045 109 static bool is_disabled_in_debug_needed(void)
mbed_official 85:e1a8e879a6a9 110 {
mbed_official 85:e1a8e879a6a9 111 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 112 {
mbed_official 85:e1a8e879a6a9 113 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(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 304:89b9c3a9a045 118
mbed_official 85:e1a8e879a6a9 119 return false;
mbed_official 85:e1a8e879a6a9 120 }
mbed_official 85:e1a8e879a6a9 121