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/*
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* Copyright (c) Nordic Semiconductor ASA |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modification, |
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* are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, this |
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* list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright notice, this |
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* list of conditions and the following disclaimer in the documentation and/or |
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* other materials provided with the distribution. |
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* |
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of other |
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* contributors to this software may be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR |
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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/* NOTE: Template files (including this one) are application specific and therefore expected to
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be copied into the application project folder prior to its use! */ |
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#include <stdint.h> |
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#include <stdbool.h> |
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#include "nrf.h" |
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#include "system_nrf51.h" |
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/*lint ++flb "Enter library region" */ |
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#define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */ |
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static bool is_manual_peripheral_setup_needed(void); |
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static bool is_disabled_in_debug_needed(void); |
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#if defined ( __CC_ARM ) |
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uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK;
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#elif defined ( __ICCARM__ ) |
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__root uint32_t SystemCoreClock = __SYSTEM_CLOCK; |
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#elif defined ( __GNUC__ ) |
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uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; |
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#endif |
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#ifndef YOTTA_CFG_HARDWARE_CLOCKS_NRF_LFCLK_SRC |
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# define YOTTA_CFG_HARDWARE_CLOCKS_NRF_LFCLK_SRC 1UL /* The default is to wait for LFLCK to start */ |
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#endif |
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void SystemCoreClockUpdate(void) |
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{ |
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SystemCoreClock = __SYSTEM_CLOCK; |
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} |
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void SystemInit(void) |
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{ |
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/* If desired, switch off the unused RAM to lower consumption by the use of RAMON register.
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It can also be done in the application main() function. */ |
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/* Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required
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to enable the use of peripherals" found at Product Anomaly document for your device found at |
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https://www.nordicsemi.com/. The side effect of executing these instructions in the devices
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that do not need it is that the new peripherals in the second generation devices (LPCOMP for |
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example) will not be available. */ |
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if (is_manual_peripheral_setup_needed()) |
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{ |
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*(uint32_t volatile *)0x40000504 = 0xC007FFDF; |
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*(uint32_t volatile *)0x40006C18 = 0x00008000; |
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} |
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/* Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG
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register is incorrect" found at Product Anomaly document four your device found at |
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https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. */
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if (is_disabled_in_debug_needed()) |
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{ |
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NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos; |
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} |
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// Start the external 32khz crystal oscillator.
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NRF_CLOCK->LFCLKSRC = (YOTTA_CFG_HARDWARE_CLOCKS_NRF_LFCLK_SRC << CLOCK_LFCLKSRC_SRC_Pos); |
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NRF_CLOCK->EVENTS_LFCLKSTARTED = 0; |
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NRF_CLOCK->TASKS_LFCLKSTART = 1; |
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// Wait for the external oscillator to start up.
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while (NRF_CLOCK->EVENTS_LFCLKSTARTED == 0) { |
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// Do nothing.
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} |
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} |
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static bool is_manual_peripheral_setup_needed(void)
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{ |
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if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
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{ |
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
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{ |
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return true; |
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} |
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
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{ |
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return true; |
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} |
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
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{ |
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return true; |
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} |
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} |
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return false; |
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} |
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static bool is_disabled_in_debug_needed(void)
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{ |
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if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) |
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{ |
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if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) |
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{ |
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return true; |
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} |
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} |
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return false; |
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} |
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/*lint --flb "Leave library region" */ |
@ -1,71 +0,0 @@ |
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/*
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* Copyright (c) Nordic Semiconductor ASA |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modification, |
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* are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, this |
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* list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright notice, this |
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* list of conditions and the following disclaimer in the documentation and/or |
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* other materials provided with the distribution. |
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* |
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of other |
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* contributors to this software may be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR |
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#ifndef SYSTEM_NRF51_H |
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#define SYSTEM_NRF51_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#include <stdint.h> |
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extern uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock) */ |
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/**
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* Initialize the system |
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* |
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* @param none |
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* @return none |
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* |
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* @brief Setup the microcontroller system. |
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* Initialize the System and update the SystemCoreClock variable. |
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*/ |
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extern void SystemInit (void); |
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/**
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* Update SystemCoreClock variable |
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* |
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* @param none |
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* @return none |
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* |
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* @brief Updates the SystemCoreClock with current core Clock
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* retrieved from cpu registers. |
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*/ |
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extern void SystemCoreClockUpdate (void); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* SYSTEM_NRF51_H */ |
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