main.cpp

00001 #include "mbed.h"
00002 
00003 Serial pc(USBTX, USBRX); // tx, rx
00004 
00005 int main() {
00006     int Fin = 12000000; // 12MHz XTAL
00007     
00008     pc.baud(921600);
00009 
00010     pc.printf("PLL Registers:\n");
00011     pc.printf(" - PLL0CFG = 0x%08X\n", LPC_SC->PLL0CFG);
00012     pc.printf(" - CLKCFG  = 0x%08X\n", LPC_SC->CCLKCFG);
00013     
00014     int M = (LPC_SC->PLL0CFG & 0xFFFF) + 1;
00015     int N = (LPC_SC->PLL0CFG >> 16) + 1;
00016     int CCLKDIV = LPC_SC->CCLKCFG + 1;
00017 
00018     pc.printf("Clock Variables:\n");
00019     pc.printf(" - Fin = %d\n", Fin);
00020     pc.printf(" - M   = %d\n", M);
00021     pc.printf(" - N   = %d\n", N);
00022     pc.printf(" - CCLKDIV = %d\n", CCLKDIV);
00023 
00024     int Fcco = (2 * M * 12000000) / N;
00025     int CCLK = Fcco / CCLKDIV;
00026 
00027     pc.printf("Clock Results:\n");
00028     pc.printf(" - Fcco = %d\n", Fcco);
00029     pc.printf(" - CCLK = %d\n", CCLK);
00030     
00031     while(1);
00032 }