lzbp li / mbed-stm32l0l1-src-1

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Fork of mbed-stm32l0/l1-src by lzbp li

targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/system_nrf51822.c@472:7bbab527289d, 2015-02-12 (annotated)

Committer:
mbed_official
Date:
Thu Feb 12 13:00:07 2015 +0000
Revision:
472:7bbab527289d
Parent:
466:12a9a5f8fea0 
Synchronized with git revision 4a7b7d067deeff485150756fa782d3952e160017



Full URL: https://github.com/mbedmicro/mbed/commit/4a7b7d067deeff485150756fa782d3952e160017/



Modify 32MHz crystal setting for NRF51822, overrides file for DFCM-NNN40 target

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 472:7bbab527289d 24 #define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */
mbed_official 85:e1a8e879a6a9 25
mbed_official 85:e1a8e879a6a9 26 static bool is_manual_peripheral_setup_needed(void);
mbed_official 85:e1a8e879a6a9 27 static bool is_disabled_in_debug_needed(void);
mbed_official 85:e1a8e879a6a9 28
mbed_official 85:e1a8e879a6a9 29
mbed_official 85:e1a8e879a6a9 30 #if defined ( __CC_ARM )
mbed_official 304:89b9c3a9a045 31 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 32 #elif defined ( __ICCARM__ )
mbed_official 85:e1a8e879a6a9 33 __root uint32_t SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 34 #elif defined ( __GNUC__ )
mbed_official 85:e1a8e879a6a9 35 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 36 #endif
mbed_official 85:e1a8e879a6a9 37
mbed_official 85:e1a8e879a6a9 38 void SystemCoreClockUpdate(void)
mbed_official 85:e1a8e879a6a9 39 {
mbed_official 85:e1a8e879a6a9 40 SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 85:e1a8e879a6a9 41 }
mbed_official 85:e1a8e879a6a9 42
mbed_official 85:e1a8e879a6a9 43 void SystemInit(void)
mbed_official 304:89b9c3a9a045 44 {
mbed_official 306:d33324c3b5a2 45 /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
mbed_official 306:d33324c3b5a2 46 It can also be done in the application main() function. */
mbed_official 306:d33324c3b5a2 47
mbed_official 85:e1a8e879a6a9 48 // Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
mbed_official 85:e1a8e879a6a9 49 // to enable the use of peripherals" found at Product Anomaly document for your device found at
mbed_official 304:89b9c3a9a045 50 // https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
mbed_official 85:e1a8e879a6a9 51 // that do not need it is that the new peripherals in the second generation devices (LPCOMP for
mbed_official 85:e1a8e879a6a9 52 // example) will not be available.
mbed_official 306:d33324c3b5a2 53 if (is_manual_peripheral_setup_needed())
mbed_official 306:d33324c3b5a2 54 {
mbed_official 85:e1a8e879a6a9 55 *(uint32_t volatile *)0x40000504 = 0xC007FFDF;
mbed_official 85:e1a8e879a6a9 56 *(uint32_t volatile *)0x40006C18 = 0x00008000;
mbed_official 85:e1a8e879a6a9 57 }
mbed_official 304:89b9c3a9a045 58
mbed_official 85:e1a8e879a6a9 59 // Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
mbed_official 304:89b9c3a9a045 60 // register is incorrect" found at Product Anomaly document four your device found at
mbed_official 304:89b9c3a9a045 61 // https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed.
mbed_official 306:d33324c3b5a2 62 if (is_disabled_in_debug_needed())
mbed_official 306:d33324c3b5a2 63 {
mbed_official 85:e1a8e879a6a9 64 NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
mbed_official 85:e1a8e879a6a9 65 }
mbed_official 304:89b9c3a9a045 66
mbed_official 304:89b9c3a9a045 67 // Start the external 32khz crystal oscillator.
mbed_official 308:29bf8b44dbf6 68
mbed_official 466:12a9a5f8fea0 69 #if defined(TARGET_DELTA_DFCM_NNN40) || defined(TARGET_HRM1017)
mbed_official 308:29bf8b44dbf6 70 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 308:29bf8b44dbf6 71 #else
mbed_official 304:89b9c3a9a045 72 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 308:29bf8b44dbf6 73 #endif
mbed_official 304:89b9c3a9a045 74 NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
mbed_official 304:89b9c3a9a045 75 NRF_CLOCK->TASKS_LFCLKSTART = 1;
mbed_official 85:e1a8e879a6a9 76
mbed_official 85:e1a8e879a6a9 77 // Wait for the external oscillator to start up.
mbed_official 304:89b9c3a9a045 78 while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) {
mbed_official 85:e1a8e879a6a9 79 // Do nothing.
mbed_official 85:e1a8e879a6a9 80 }
mbed_official 85:e1a8e879a6a9 81 }
mbed_official 85:e1a8e879a6a9 82
mbed_official 304:89b9c3a9a045 83 static bool is_manual_peripheral_setup_needed(void)
mbed_official 85:e1a8e879a6a9 84 {
mbed_official 85:e1a8e879a6a9 85 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 86 {
mbed_official 85:e1a8e879a6a9 87 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 88 {
mbed_official 85:e1a8e879a6a9 89 return true;
mbed_official 85:e1a8e879a6a9 90 }
mbed_official 85:e1a8e879a6a9 91 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(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) == 0x30) && (((*(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 }
mbed_official 304:89b9c3a9a045 100
mbed_official 85:e1a8e879a6a9 101 return false;
mbed_official 85:e1a8e879a6a9 102 }
mbed_official 85:e1a8e879a6a9 103
mbed_official 304:89b9c3a9a045 104 static bool is_disabled_in_debug_needed(void)
mbed_official 85:e1a8e879a6a9 105 {
mbed_official 85:e1a8e879a6a9 106 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 85:e1a8e879a6a9 107 {
mbed_official 85:e1a8e879a6a9 108 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 85:e1a8e879a6a9 109 {
mbed_official 85:e1a8e879a6a9 110 return true;
mbed_official 85:e1a8e879a6a9 111 }
mbed_official 85:e1a8e879a6a9 112 }
mbed_official 304:89b9c3a9a045 113
mbed_official 85:e1a8e879a6a9 114 return false;
mbed_official 85:e1a8e879a6a9 115 }
mbed_official 85:e1a8e879a6a9 116