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targets/cmsis/TARGET_WIZNET/TARGET_W7500x/TARGET_WIZwiki_W7500/system_W7500x.c
- Committer:
- mbed_official
- Date:
- 2015-06-03
- Revision:
- 558:0880f51c4036
File content as of revision 558:0880f51c4036:
/**************************************************************************//** * @file system_CMSDK_CM0.c * @brief CMSIS Cortex-M0 Device Peripheral Access Layer Source File for * Device CMSDK * @version V3.01 * @date 06. March 2012 * * @note * Copyright (C) 2010-2012 ARM Limited. All rights reserved. * * @par * ARM Limited (ARM) is supplying this software for use with Cortex-M * processor based microcontrollers. This file can be freely distributed * within development tools that are supporting such ARM based processors. * * @par * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. * ******************************************************************************/ #include "system_W7500x.h" /*---------------------------------------------------------------------------- DEFINES *----------------------------------------------------------------------------*/ //#define SYSCLK_EXTERN_OSC /*---------------------------------------------------------------------------- Clock Variable definitions *----------------------------------------------------------------------------*/ uint32_t SystemFrequency = 0; /*!< System Clock Frequency (Core Clock) */ uint32_t SystemCoreClock = 0; /*!< Processor Clock Frequency */ /*---------------------------------------------------------------------------- Clock functions *----------------------------------------------------------------------------*/ void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */ { uint8_t M,N,OD; #ifdef SYSCLK_EXTERN_OSC CRG->PLL_IFSR = CRG_PLL_IFSR_OCLK; #else CRG->PLL_IFSR = CRG_PLL_IFSR_RCLK; #endif OD = (1 << (CRG->PLL_FCR & 0x01)) * (1 << ((CRG->PLL_FCR & 0x02) >> 1)); N = (CRG->PLL_FCR >> 8 ) & 0x3F; M = (CRG->PLL_FCR >> 16) & 0x3F; #ifdef SYSCLK_EXTERN_OSC SystemCoreClock = EXTERN_XTAL * M / N * 1 / OD; #else SystemCoreClock = INTERN_XTAL * M / N * 1 / OD; #endif } uint32_t GetSystemClock() { return SystemCoreClock; } /** * Initialize the system * * @param none * @return none * * @brief Setup the microcontroller system. * Initialize the System. */ void SystemInit (void) { uint8_t M,N,OD; (*((volatile uint32_t *)(W7500x_TRIM_BGT))) = (*((volatile uint32_t *)(W7500x_INFO_BGT))); (*((volatile uint32_t *)(W7500x_TRIM_OSC))) = (*((volatile uint32_t *)(W7500x_INFO_OSC))); // Set PLL input frequency #ifdef SYSCLK_EXTERN_OSC CRG->PLL_IFSR = CRG_PLL_IFSR_OCLK; #else CRG->PLL_IFSR = CRG_PLL_IFSR_RCLK; #endif OD = (1 << (CRG->PLL_FCR & 0x01)) * (1 << ((CRG->PLL_FCR & 0x02) >> 1)); N = (CRG->PLL_FCR >> 8 ) & 0x3F; M = (CRG->PLL_FCR >> 16) & 0x3F; #ifdef SYSCLK_EXTERN_OSC SystemCoreClock = EXTERN_XTAL * M / N * 1 / OD; #else SystemCoreClock = INTERN_XTAL * M / N * 1 / OD; #endif }