Joris Aerts / mbed-src

mbed library sources

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targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/system_nrf51.c@598:2d5fc5624619, 2015-07-29 (annotated)

Committer:
mbed_official
Date:
Wed Jul 29 09:45:09 2015 +0100
Revision:
598:2d5fc5624619
Parent:
501:36015dec7d16
Child:
603:3c75ef011213
Synchronized with git revision e87fec7b35d45d8663318a40a4a9fb58f91d0237



Full URL: https://github.com/mbedmicro/mbed/commit/e87fec7b35d45d8663318a40a4a9fb58f91d0237/



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mbed_official 501:36015dec7d16 1 /* Copyright (c) 2013, Nordic Semiconductor ASA
mbed_official 501:36015dec7d16 2 * All rights reserved.
mbed_official 501:36015dec7d16 3 *
mbed_official 501:36015dec7d16 4 * Redistribution and use in source and binary forms, with or without
mbed_official 501:36015dec7d16 5 * modification, are permitted provided that the following conditions are met:
mbed_official 501:36015dec7d16 6 *
mbed_official 501:36015dec7d16 7 * * Redistributions of source code must retain the above copyright notice, this
mbed_official 501:36015dec7d16 8 * list of conditions and the following disclaimer.
mbed_official 501:36015dec7d16 9 *
mbed_official 501:36015dec7d16 10 * * Redistributions in binary form must reproduce the above copyright notice,
mbed_official 501:36015dec7d16 11 * this list of conditions and the following disclaimer in the documentation
mbed_official 501:36015dec7d16 12 * and/or other materials provided with the distribution.
mbed_official 501:36015dec7d16 13 *
mbed_official 501:36015dec7d16 14 * * Neither the name of Nordic Semiconductor ASA nor the names of its
mbed_official 501:36015dec7d16 15 * contributors may be used to endorse or promote products derived from
mbed_official 501:36015dec7d16 16 * this software without specific prior written permission.
mbed_official 501:36015dec7d16 17 *
mbed_official 501:36015dec7d16 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 501:36015dec7d16 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 501:36015dec7d16 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 501:36015dec7d16 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 501:36015dec7d16 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 501:36015dec7d16 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 501:36015dec7d16 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 501:36015dec7d16 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 501:36015dec7d16 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 501:36015dec7d16 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 501:36015dec7d16 28 *
mbed_official 501:36015dec7d16 29 */
mbed_official 501:36015dec7d16 30
mbed_official 501:36015dec7d16 31 /* NOTE: Template files (including this one) are application specific and therefore expected to
mbed_official 501:36015dec7d16 32 be copied into the application project folder prior to its use! */
mbed_official 501:36015dec7d16 33
mbed_official 501:36015dec7d16 34 #include <stdint.h>
mbed_official 501:36015dec7d16 35 #include <stdbool.h>
mbed_official 501:36015dec7d16 36 #include "nrf.h"
mbed_official 501:36015dec7d16 37 #include "system_nrf51.h"
mbed_official 501:36015dec7d16 38
mbed_official 501:36015dec7d16 39 /*lint ++flb "Enter library region" */
mbed_official 501:36015dec7d16 40
mbed_official 501:36015dec7d16 41 #define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */
mbed_official 501:36015dec7d16 42
mbed_official 501:36015dec7d16 43 static bool is_manual_peripheral_setup_needed(void);
mbed_official 501:36015dec7d16 44 static bool is_disabled_in_debug_needed(void);
mbed_official 501:36015dec7d16 45
mbed_official 501:36015dec7d16 46
mbed_official 501:36015dec7d16 47 #if defined ( __CC_ARM )
mbed_official 501:36015dec7d16 48 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 501:36015dec7d16 49 #elif defined ( __ICCARM__ )
mbed_official 501:36015dec7d16 50 __root uint32_t SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 501:36015dec7d16 51 #elif defined ( __GNUC__ )
mbed_official 501:36015dec7d16 52 uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
mbed_official 501:36015dec7d16 53 #endif
mbed_official 501:36015dec7d16 54
mbed_official 501:36015dec7d16 55 void SystemCoreClockUpdate(void)
mbed_official 501:36015dec7d16 56 {
mbed_official 501:36015dec7d16 57 SystemCoreClock = __SYSTEM_CLOCK;
mbed_official 501:36015dec7d16 58 }
mbed_official 501:36015dec7d16 59
mbed_official 501:36015dec7d16 60 void SystemInit(void)
mbed_official 501:36015dec7d16 61 {
mbed_official 501:36015dec7d16 62 /* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
mbed_official 501:36015dec7d16 63 It can also be done in the application main() function. */
mbed_official 501:36015dec7d16 64
mbed_official 501:36015dec7d16 65 /* Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
mbed_official 501:36015dec7d16 66 to enable the use of peripherals" found at Product Anomaly document for your device found at
mbed_official 501:36015dec7d16 67 https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
mbed_official 501:36015dec7d16 68 that do not need it is that the new peripherals in the second generation devices (LPCOMP for
mbed_official 501:36015dec7d16 69 example) will not be available. */
mbed_official 501:36015dec7d16 70 if (is_manual_peripheral_setup_needed())
mbed_official 501:36015dec7d16 71 {
mbed_official 501:36015dec7d16 72 *(uint32_t volatile *)0x40000504 = 0xC007FFDF;
mbed_official 501:36015dec7d16 73 *(uint32_t volatile *)0x40006C18 = 0x00008000;
mbed_official 501:36015dec7d16 74 }
mbed_official 501:36015dec7d16 75
mbed_official 501:36015dec7d16 76 /* Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
mbed_official 501:36015dec7d16 77 register is incorrect" found at Product Anomaly document four your device found at
mbed_official 501:36015dec7d16 78 https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. */
mbed_official 501:36015dec7d16 79 if (is_disabled_in_debug_needed())
mbed_official 501:36015dec7d16 80 {
mbed_official 501:36015dec7d16 81 NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos;
mbed_official 501:36015dec7d16 82 }
mbed_official 501:36015dec7d16 83
mbed_official 501:36015dec7d16 84 // Start the external 32khz crystal oscillator.
mbed_official 501:36015dec7d16 85
mbed_official 598:2d5fc5624619 86 /* for Nordic devices without an external LF crystal */
mbed_official 598:2d5fc5624619 87 #if defined(TARGET_NRF_LFCLK_RC)
mbed_official 501:36015dec7d16 88 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_RC << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 501:36015dec7d16 89 #else
mbed_official 501:36015dec7d16 90 NRF_CLOCK->LFCLKSRC = (CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos);
mbed_official 501:36015dec7d16 91 #endif
mbed_official 501:36015dec7d16 92 NRF_CLOCK->EVENTS_LFCLKSTARTED = 0;
mbed_official 501:36015dec7d16 93 NRF_CLOCK->TASKS_LFCLKSTART = 1;
mbed_official 501:36015dec7d16 94
mbed_official 501:36015dec7d16 95 // Wait for the external oscillator to start up.
mbed_official 501:36015dec7d16 96 while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) {
mbed_official 501:36015dec7d16 97 // Do nothing.
mbed_official 501:36015dec7d16 98 }
mbed_official 501:36015dec7d16 99 }
mbed_official 501:36015dec7d16 100
mbed_official 501:36015dec7d16 101 static bool is_manual_peripheral_setup_needed(void)
mbed_official 501:36015dec7d16 102 {
mbed_official 501:36015dec7d16 103 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 501:36015dec7d16 104 {
mbed_official 501:36015dec7d16 105 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 501:36015dec7d16 106 {
mbed_official 501:36015dec7d16 107 return true;
mbed_official 501:36015dec7d16 108 }
mbed_official 501:36015dec7d16 109 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 501:36015dec7d16 110 {
mbed_official 501:36015dec7d16 111 return true;
mbed_official 501:36015dec7d16 112 }
mbed_official 501:36015dec7d16 113 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 501:36015dec7d16 114 {
mbed_official 501:36015dec7d16 115 return true;
mbed_official 501:36015dec7d16 116 }
mbed_official 501:36015dec7d16 117 }
mbed_official 501:36015dec7d16 118
mbed_official 501:36015dec7d16 119 return false;
mbed_official 501:36015dec7d16 120 }
mbed_official 501:36015dec7d16 121
mbed_official 501:36015dec7d16 122 static bool is_disabled_in_debug_needed(void)
mbed_official 501:36015dec7d16 123 {
mbed_official 501:36015dec7d16 124 if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0))
mbed_official 501:36015dec7d16 125 {
mbed_official 501:36015dec7d16 126 if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0))
mbed_official 501:36015dec7d16 127 {
mbed_official 501:36015dec7d16 128 return true;
mbed_official 501:36015dec7d16 129 }
mbed_official 501:36015dec7d16 130 }
mbed_official 501:36015dec7d16 131
mbed_official 501:36015dec7d16 132 return false;
mbed_official 501:36015dec7d16 133 }
mbed_official 501:36015dec7d16 134
mbed_official 501:36015dec7d16 135 /*lint --flb "Leave library region" */