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139 lines
4.4 KiB
C
139 lines
4.4 KiB
C
/**************************************************************************//**
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* @file system_ARMCM3.c
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* @brief CMSIS Device System Source File for
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* ARMCM3 Device Series
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* @version V1.08
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* @date 23. November 2012
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*
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* @note
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*
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******************************************************************************/
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/* Copyright (c) 2011 - 2012 ARM LIMITED
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of ARM nor the names of its contributors may be used
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to endorse or promote products derived from this software without
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specific prior written permission.
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*
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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---------------------------------------------------------------------------*/
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#include "basic_types.h"
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#include "rtl8195a.h"
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/*----------------------------------------------------------------------------
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Define clocks
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*----------------------------------------------------------------------------*/
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#define __HSI ( 8000000UL)
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#define __XTAL ( 5000000UL) /* Oscillator frequency */
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//#define __SYSTEM_CLOCK (5*__XTAL)
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#define __SYSTEM_CLOCK (200000000UL/6*5)
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extern unsigned int rand_x;
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extern u32 HalGetCpuClk(VOID);
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#ifdef CONFIG_CHIP_A_CUT
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const u32 SysCpkClkTbl[]= {
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200000000,
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100000000,
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50000000,
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25000000,
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12500000,
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4000000
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};
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#endif
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u32 Rand2(void)
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{
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static unsigned int y = 362436;
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static unsigned int z = 521288629;
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static unsigned int c = 7654321;
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unsigned long long t, a= 698769069;
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rand_x = 69069 * rand_x + 12345;
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y ^= (y << 13); y ^= (y >> 17); y ^= (y << 5);
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t = a * z + c; c = (t >> 32); z = t;
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return rand_x + y + z;
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}
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/*----------------------------------------------------------------------------
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Clock Variable definitions
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*----------------------------------------------------------------------------*/
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uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/
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u32
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SystemGetCpuClk(void)
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{
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#ifdef CONFIG_CHIP_A_CUT
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u32 CpuType = 0, CpuClk = 0, FreqDown = 0;
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CpuType = ((HAL_READ32(SYSTEM_CTRL_BASE, REG_SYS_CLK_CTRL1) & (0x70)) >> 4);
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FreqDown = HAL_READ32(SYSTEM_CTRL_BASE, REG_SYS_SYSPLL_CTRL1) & BIT17;
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CpuClk = SysCpkClkTbl[CpuType];
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if ( !FreqDown ) {
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if ( CpuClk > 4000000 ){
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CpuClk = (CpuClk*5/6);
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}
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}
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return CpuClk;
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#else
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return HalGetCpuClk();
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#endif
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}
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/*----------------------------------------------------------------------------
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Clock functions
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*----------------------------------------------------------------------------*/
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void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */
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{
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// SystemCoreClock = __SYSTEM_CLOCK;
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SystemCoreClock = SystemGetCpuClk();
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}
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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.
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*/
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void SystemInit (void)
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{
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// TODO: Hardware initial
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#ifdef UNALIGNED_SUPPORT_DISABLE
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SCB->CCR |= SCB_CCR_UNALIGN_TRP_Msk;
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#endif
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//SystemCoreClock = __SYSTEM_CLOCK;
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//SystemCoreClock = HalGetCpuClk();
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SystemCoreClockUpdate();
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}
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