/* Copyright (c) 2015, Nordic Semiconductor ASA | |
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* list of conditions and the following disclaimer. | |
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* * Redistributions in binary form must reproduce the above copyright notice, | |
* this list of conditions and the following disclaimer in the documentation | |
* and/or other materials provided with the distribution. | |
* | |
* * Neither the name of Nordic Semiconductor ASA nor the names of its | |
* contributors may be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
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*/ | |
#include <stdint.h> | |
#include <stdbool.h> | |
#include "mcu/cmsis_nvic.h" | |
#include "nrf.h" | |
#include "system_nrf51.h" | |
/*lint ++flb "Enter library region" */ | |
#define __SYSTEM_CLOCK (16000000UL) /*!< nRF51 devices use a fixed System Clock Frequency of 16MHz */ | |
static bool is_manual_peripheral_setup_needed(void); | |
static bool is_disabled_in_debug_needed(void); | |
#if defined ( __CC_ARM ) | |
uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; | |
#elif defined ( __ICCARM__ ) | |
__root uint32_t SystemCoreClock = __SYSTEM_CLOCK; | |
#elif defined ( __GNUC__ ) | |
uint32_t SystemCoreClock __attribute__((used)) = __SYSTEM_CLOCK; | |
#endif | |
void SystemCoreClockUpdate(void) | |
{ | |
SystemCoreClock = __SYSTEM_CLOCK; | |
} | |
void SystemInit(void) | |
{ | |
/* If desired, switch off the unused RAM to lower consumption by the use of RAMON register. | |
It can also be done in the application main() function. */ | |
/* Prepare the peripherals for use as indicated by the PAN 26 "System: Manual setup is required | |
to enable the use of peripherals" found at Product Anomaly document for your device found at | |
https://www.nordicsemi.com/. The side effect of executing these instructions in the devices | |
that do not need it is that the new peripherals in the second generation devices (LPCOMP for | |
example) will not be available. */ | |
if (is_manual_peripheral_setup_needed()) | |
{ | |
*(uint32_t volatile *)0x40000504 = 0xC007FFDF; | |
*(uint32_t volatile *)0x40006C18 = 0x00008000; | |
} | |
/* Disable PROTENSET registers under debug, as indicated by PAN 59 "MPU: Reset value of DISABLEINDEBUG | |
register is incorrect" found at Product Anomaly document four your device found at | |
https://www.nordicsemi.com/. There is no side effect of using these instruction if not needed. */ | |
if (is_disabled_in_debug_needed()) | |
{ | |
NRF_MPU->DISABLEINDEBUG = MPU_DISABLEINDEBUG_DISABLEINDEBUG_Disabled << MPU_DISABLEINDEBUG_DISABLEINDEBUG_Pos; | |
} | |
NVIC_Relocate(); | |
} | |
static bool is_manual_peripheral_setup_needed(void) | |
{ | |
if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) | |
{ | |
if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x00) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) | |
{ | |
return true; | |
} | |
if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x10) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) | |
{ | |
return true; | |
} | |
if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x30) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) | |
{ | |
return true; | |
} | |
} | |
return false; | |
} | |
static bool is_disabled_in_debug_needed(void) | |
{ | |
if ((((*(uint32_t *)0xF0000FE0) & 0x000000FF) == 0x1) && (((*(uint32_t *)0xF0000FE4) & 0x0000000F) == 0x0)) | |
{ | |
if ((((*(uint32_t *)0xF0000FE8) & 0x000000F0) == 0x40) && (((*(uint32_t *)0xF0000FEC) & 0x000000F0) == 0x0)) | |
{ | |
return true; | |
} | |
} | |
return false; | |
} | |
/*lint --flb "Leave library region" */ |