mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/system_nrf51822.c@306:d33324c3b5a2, 2014-09-03 (annotated)
- Committer:
- mbed_official
- Date:
- Wed Sep 03 13:30:08 2014 +0100
- Revision:
- 306:d33324c3b5a2
- Parent:
- 304:89b9c3a9a045
- Child:
- 308:29bf8b44dbf6
Synchronized with git revision 7aedd02f25c846ee1f22665ecc167585a8ad56bb
Full URL: https://github.com/mbedmicro/mbed/commit/7aedd02f25c846ee1f22665ecc167585a8ad56bb/
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 | 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 | 306:d33324c3b5a2 | 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 | 304:89b9c3a9a045 | 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 | void SystemCoreClockUpdate(void) |
mbed_official | 85:e1a8e879a6a9 | 40 | { |
mbed_official | 85:e1a8e879a6a9 | 41 | SystemCoreClock = __SYSTEM_CLOCK; |
mbed_official | 85:e1a8e879a6a9 | 42 | } |
mbed_official | 85:e1a8e879a6a9 | 43 | |
mbed_official | 85:e1a8e879a6a9 | 44 | void SystemInit(void) |
mbed_official | 304:89b9c3a9a045 | 45 | { |
mbed_official | 306:d33324c3b5a2 | 46 | /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register. |
mbed_official | 306:d33324c3b5a2 | 47 | It can also be done in the application main() function. */ |
mbed_official | 306:d33324c3b5a2 | 48 | |
mbed_official | 85:e1a8e879a6a9 | 49 | // Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required |
mbed_official | 85:e1a8e879a6a9 | 50 | // to enable the use of peripherals" found at Product Anomaly document for your device found at |
mbed_official | 304:89b9c3a9a045 | 51 | // https://www.nordicsemi.com/. The side effect of executing these instructions in the devices |
mbed_official | 85:e1a8e879a6a9 | 52 | // that do not need it is that the new peripherals in the second generation devices (LPCOMP for |
mbed_official | 85:e1a8e879a6a9 | 53 | // example) will not be available. |
mbed_official | 306:d33324c3b5a2 | 54 | if (is_manual_peripheral_setup_needed()) |
mbed_official | 306:d33324c3b5a2 | 55 | { |
mbed_official | 85:e1a8e879a6a9 | 56 | *(uint32_t volatile *)0x40000504 = 0xC007FFDF; |
mbed_official | 85:e1a8e879a6a9 | 57 | *(uint32_t volatile *)0x40006C18 = 0x00008000; |
mbed_official | 85:e1a8e879a6a9 | 58 | } |
mbed_official | 304:89b9c3a9a045 | 59 | |
mbed_official | 85:e1a8e879a6a9 | 60 | // Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG |
mbed_official | 304:89b9c3a9a045 | 61 | // register is incorrect" found at Product Anomaly document four your device found at |
mbed_official | 304:89b9c3a9a045 | 62 | // https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. |
mbed_official | 306:d33324c3b5a2 | 63 | if (is_disabled_in_debug_needed()) |
mbed_official | 306:d33324c3b5a2 | 64 | { |
mbed_official | 85:e1a8e879a6a9 | 65 | NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos; |
mbed_official | 85:e1a8e879a6a9 | 66 | } |
mbed_official | 304:89b9c3a9a045 | 67 | |
mbed_official | 304:89b9c3a9a045 | 68 | // Start the external 32khz crystal oscillator. |
mbed_official | 304:89b9c3a9a045 | 69 | NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos); |
mbed_official | 304:89b9c3a9a045 | 70 | NRF_CLOCK->EVENTS_LFCLKSTARTED = 0; |
mbed_official | 304:89b9c3a9a045 | 71 | NRF_CLOCK->TASKS_LFCLKSTART = 1; |
mbed_official | 85:e1a8e879a6a9 | 72 | |
mbed_official | 85:e1a8e879a6a9 | 73 | // Wait for the external oscillator to start up. |
mbed_official | 304:89b9c3a9a045 | 74 | while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) { |
mbed_official | 85:e1a8e879a6a9 | 75 | // Do nothing. |
mbed_official | 85:e1a8e879a6a9 | 76 | } |
mbed_official | 85:e1a8e879a6a9 | 77 | } |
mbed_official | 85:e1a8e879a6a9 | 78 | |
mbed_official | 304:89b9c3a9a045 | 79 | static bool is_manual_peripheral_setup_needed(void) |
mbed_official | 85:e1a8e879a6a9 | 80 | { |
mbed_official | 85:e1a8e879a6a9 | 81 | if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 82 | { |
mbed_official | 85:e1a8e879a6a9 | 83 | if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 84 | { |
mbed_official | 85:e1a8e879a6a9 | 85 | return true; |
mbed_official | 85:e1a8e879a6a9 | 86 | } |
mbed_official | 85:e1a8e879a6a9 | 87 | if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(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) == 0x30) && (((*(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 | } |
mbed_official | 304:89b9c3a9a045 | 96 | |
mbed_official | 85:e1a8e879a6a9 | 97 | return false; |
mbed_official | 85:e1a8e879a6a9 | 98 | } |
mbed_official | 85:e1a8e879a6a9 | 99 | |
mbed_official | 304:89b9c3a9a045 | 100 | static bool is_disabled_in_debug_needed(void) |
mbed_official | 85:e1a8e879a6a9 | 101 | { |
mbed_official | 85:e1a8e879a6a9 | 102 | if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 103 | { |
mbed_official | 85:e1a8e879a6a9 | 104 | if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
mbed_official | 85:e1a8e879a6a9 | 105 | { |
mbed_official | 85:e1a8e879a6a9 | 106 | return true; |
mbed_official | 85:e1a8e879a6a9 | 107 | } |
mbed_official | 85:e1a8e879a6a9 | 108 | } |
mbed_official | 304:89b9c3a9a045 | 109 | |
mbed_official | 85:e1a8e879a6a9 | 110 | return false; |
mbed_official | 85:e1a8e879a6a9 | 111 | } |
mbed_official | 85:e1a8e879a6a9 | 112 |