//******************************************************************************************
//   Project      :  LPC1343 Sample Program
//   Program Name :
//   Programer    :
//   Create date  :  Version 1.0    H24.10.15
//   History      :
//   Laungage     :
// ******************************************************************************************
//  (1)Description
//        CLOCKOUT : PIO(0_1)
//
// ******************************************************************************************
#include "LPC13xx.h"

void IntCLKOUT(uint32_t, unsigned char );

#define    PI_CLKOUT_IRC           0
#define    PI_CLKOUT_SYSOSC        1
#define    PI_CLKOUT_WTOSC         2
#define    PI_CLKOUT_MAINCLK       3


int main( void )
{

// ********************
//  1.Initialized Segmant
// ********************
//  (1)Define I/O PORT (Configuration)
//  PIO0_1   Reset PIN
    LPC_IOCON->PIO0_1 = 0b01;        //PIO0_1/CLKOUT/CT32B0_MAT2/USB_FTOGGLE (R/W)
    LPC_IOCON->PIO0_2 = 0b00;        //PIO0_2/SSEL0/CT16B0_CAP0              (R/W)
    LPC_IOCON->PIO0_3 = 0b00;        //PIO0_3/USB_VBUS                       (R/W)
    LPC_IOCON->PIO0_4 = 0b00;        //PIO0_4/SCL                            (R/W)
    LPC_IOCON->PIO0_5 = 0b00;        //PIO0_5/SDA                            (R/W)
    LPC_IOCON->PIO0_6 = 0b00;        //PIO0_6/USB_CONNECT/SCK0               (R/W)
    LPC_IOCON->PIO0_7 = 0b00;        //PIO0_7/CTS                            (R/W)

//  (2)Clock OUT
//  IntCLKOUT((uint32_t)PI_CLKOUT_IRC,     (unsigned char)1);       //IRC oscillator (12MHz)
    IntCLKOUT((uint32_t)PI_CLKOUT_SYSOSC,  (unsigned char)1);       //System oscillator(12.000MHz)
//  IntCLKOUT((uint32_t)PI_CLKOUT_WTOSC,   (unsigned char)1);       //Watchdog oscillator(No output)
//  IntCLKOUT((uint32_t)PI_CLKOUT_MAINCLK, (unsigned char)1);       //Main clock(28MHz)

// ********************
//  2.Main
// ********************
    while(1);
}

//******************************************************************************************
//   Function Name : IntCLKOUT
//   Title         : 
//   Input         :
//   Output        :
//******************************************************************************************
void IntCLKOUT(uint32_t out_mode, unsigned char c_dev)
{
// **************************************** 
//    CLKOUTCLKSEL (CLKOUT clock source select register)
// **************************************** 
//       CLKOUTCLKSEL[1:0] SEL: CLKOUT clock source       Reset value : 0x00
//          0x0 IRC oscillator
//          0x1 System oscillator
//          0x2 Watchdog oscillator
//          0x3 Main clock
//       CLKOUTCLKSEL[31:2]  Reserved
    LPC_SYSCON->CLKOUTCLKSEL = out_mode;

// **************************************** 
//    CLKOUTUEN (CLKOUT clock source update enable register)
// **************************************** 
//    CLKOUTUEN[0] ENA:  Enable CLKOUT clock source update 
//          0 No change
//          1 Update clock source
//    CLKOUTUEN[31:1]  Reserved

    LPC_SYSCON->CLKOUTUEN = 0x01;                     // Update clock 
    LPC_SYSCON->CLKOUTUEN = 0x00;                     // Toggle update register once 
    LPC_SYSCON->CLKOUTUEN = 0x01;
    while ( !(LPC_SYSCON->CLKOUTUEN & 0x01) );        // Wait until updated 

// **************************************** 
//    CLKOUTCLKDIV (CLKOUT clock divider register)
// **************************************** 
//        CLKOUTCLKDIV[7:0]: DIV Clock output divider values
//               0: Disable CLKOUT.
//               1: Divide by 1.
//                * * * * *
//             255: Divide by 255.
//        CLKOUTCLKDIV[31:8]:  Reserved 
    LPC_SYSCON->CLKOUTDIV = c_dev;                     // Divided by 1 
}