ClockControl

Published 24 Jan 2010, by Michael Wei

clock, control, frequency

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Show/hide line numbers ClockControl.cpp Source File

ClockControl.cpp

00001 #include "ClockControl.h"
00002 
00003 void setPLL0Frequency(unsigned char clkSrc, unsigned short M, unsigned char N)
00004 {
00005       LPC_SC->CLKSRCSEL = clkSrc;
00006       LPC_SC->PLL0CFG   = (((unsigned int)N-1) << 16) | M-1;
00007       LPC_SC->PLL0CON   = 0x01;             
00008       LPC_SC->PLL0FEED  = 0xAA;
00009       LPC_SC->PLL0FEED  = 0x55;
00010       while (!(LPC_SC->PLL0STAT & (1<<26)));
00011     
00012       LPC_SC->PLL0CON   = 0x03;
00013       LPC_SC->PLL0FEED  = 0xAA;
00014       LPC_SC->PLL0FEED  = 0x55;
00015 }
00016 
00017 void setPLL1Frequency(unsigned char clkSrc, unsigned short M, unsigned char N)
00018 {
00019       LPC_SC->CLKSRCSEL = clkSrc;
00020       LPC_SC->PLL1CFG   = (((unsigned int)N-1) << 16) | M-1;
00021       LPC_SC->PLL1CON   = 0x01;             
00022       LPC_SC->PLL1FEED  = 0xAA;
00023       LPC_SC->PLL1FEED  = 0x55;
00024       while (!(LPC_SC->PLL1STAT & (1<<26)));
00025     
00026       LPC_SC->PLL1CON   = 0x03;
00027       LPC_SC->PLL1FEED  = 0xAA;
00028       LPC_SC->PLL1FEED  = 0x55;
00029 }
00030 
00031 unsigned int setSystemFrequency(unsigned char clkDivider, unsigned char clkSrc, unsigned short M, unsigned char N)
00032 {
00033     setPLL0Frequency(clkSrc, M, N);
00034     LPC_SC->CCLKCFG = clkDivider - 1;
00035     SystemCoreClockUpdate();
00036     return SystemCoreClock;
00037 }