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/*------------------------------------------------------------------------------
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-- This file is a part of the libuc, microcontroler library
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-- Copyright (C) 2011, Alexis Jeandet
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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-------------------------------------------------------------------------------
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-- Author : Alexis Jeandet
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-- Mail : alexis.jeandet@gmail.com
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-------------------------------------------------------------------------------*/
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#include "core.h"
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extern unsigned int OSC0;
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extern unsigned int INTOSC;
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extern unsigned int RTCOSC;
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void coresetCpuFreq(unsigned int freq)
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{
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unsigned int inputFreq = 10000,PLLFREQ=300000000;
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unsigned int M0=6,N0=1;
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if(pll0getClksrc==pll0useInternal)
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{
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inputFreq=INTOSC;
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}
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if(pll0getClksrc==pll0useMainOsc)
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{
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inputFreq=OSC0;
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}
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if(pll0getClksrc==pll0useRTC)
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{
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inputFreq=RTCOSC;
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}
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LPC_SC->CCLKCFG = (PLLFREQ/freq)-1;
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while(N0<33)
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{
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M0=(PLLFREQ*N0)/(2*inputFreq);
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if((6<M0)&&(M0<512))
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{
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LPC_SC->PLL0CFG = (M0-1)+((N0-1)<<16);
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LPC_SC->PLL0FEED = 0xAA;
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LPC_SC->PLL0FEED = 0x55;
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LPC_SC->PLL0CON = 1;
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LPC_SC->PLL0FEED = 0xAA;
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LPC_SC->PLL0FEED = 0x55;
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while (!(LPC_SC->PLL0STAT & (1<<26)));
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LPC_SC->PLL0CON = 3;
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LPC_SC->PLL0FEED = 0xAA;
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LPC_SC->PLL0FEED = 0x55;
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while (!(LPC_SC->PLL0STAT & ((1<<25) | (1<<24))));
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break;
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}
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N0++;
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}
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}
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unsigned int coregetCpuFreq()
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{
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unsigned int inputFreq;
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unsigned int M0,N0,CPUDIV;
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M0 = (LPC_SC->PLL0CFG & 0x3FFF) + 1;
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N0 = ((LPC_SC->PLL0CFG>>16) & 0xFF) + 1;
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CPUDIV = LPC_SC->CCLKCFG + 1;
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if(pll0getClksrc==pll0useInternal){ inputFreq=INTOSC;}
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if(pll0getClksrc==pll0useMainOsc) {inputFreq=OSC0;}
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if(pll0getClksrc==pll0useRTC) {inputFreq=RTCOSC;}
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if((LPC_SC->PLL0CON & 2)==2) {return ((inputFreq*M0*2)/(N0*CPUDIV));}
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return inputFreq;
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}
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