//******************************************************************************************
//   Project      :  LPC1114 Sample Program
//   Program Name :
//   Programer    :
//   Create date  :  Version 1.0    H24.09.24
//   History      :
//   Laungage     :
// ******************************************************************************************
//  (1)Description
//
// ******************************************************************************************

#include "LPC11xx.h"

//
//Define function
//
void InitUART(void);
void SendUART(unsigned char);
void RecUART(unsigned char *);
void SendUARTStr(unsigned char *);


int main(void) {

   unsigned char IO_char;

// *******************
//  1.Initialize
// *******************
// (1)Define I/O Port
    LPC_IOCON->PIO1_6 = 0b01;
    LPC_IOCON->PIO1_7 = 0b01;

// (2)Initialize UART
    InitUART();

// (3)Put Message
    SendUARTStr("    LPC1114 Connected OK> ");

// *******************
//  2.Program Main
// *******************
    while(1){
        RecUART(&IO_char);
        SendUART(IO_char);
    }
}


//******************************************************************************************
//   Function Name : InitUART
//   Title         : Initialized UART
//   Input         :
//   Output        :
//******************************************************************************************
void InitUART(void)
{
    uint32_t  baudrate = (uint32_t)9600 ;
    uint32_t  DL;  

    LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);           	
    LPC_SYSCON->UARTCLKDIV = 0x01;        //UART clock                  	
    DL = (SystemCoreClock * LPC_SYSCON->SYSAHBCLKDIV) / (16 * baudrate * LPC_SYSCON->UARTCLKDIV);
    LPC_UART->LCR = 0b10000011;  //  8-bit character length, DLAB enable ( DLAB = 1)                     
    LPC_UART->DLM = DL / 256;    //  Determines the baud rate of the UART (MSB Register)     (Access DLAB = 1)           	
    LPC_UART->DLL = DL % 256;    //  Determines the baud rate of the UART (LSB Register)     (Access DLAB = 1)               	
    LPC_UART->LCR = 0b00000011;  //  8-bit character length , DLAB disable ( DLAB = 0)                              	
    LPC_UART->FCR = 0b00000111;  //  FIFOEN:Active high enable for both UART Rx and TX FIFOs and U0FCR[7:1] access
                                 //  RXFIFORES:Writing a logic 1 to U0FCR[1] will clear all bytes in UART Rx FIFO, reset the pointer logic. 
                                 //  TXFIFORES:Writing a logic 1 to U0FCR[2] will clear all bytes in UART TX FIFO, reset the pointer logic. 
}

//******************************************************************************************
//   Function Name : SendUARTStr
//   Title         : Send UART Strings
//   Input         :
//   Output        :
//******************************************************************************************
void SendUARTStr(unsigned char in_s[])
{
    unsigned char lp = 0;

    while(in_s[lp] != 0){
        SendUART(in_s[lp]);
        lp++; 
    }
}

//******************************************************************************************
//   Function Name : SendUART
//   Title         : Send UART
//   Input         :
//   Output        :
//******************************************************************************************
void SendUART(unsigned char in_c)
{
    while (!(LPC_UART->LSR & (1<<5)));  //THRE: Transmitter Holding Register Empty.
                                        // 0: THR contains valid data, 1: THR is empty 
    LPC_UART->THR = in_c;  
}

//******************************************************************************************
//   Function Name : RecUART
//   Title         : Recive UART
//   Input         :
//   Output        :
//******************************************************************************************
void RecUART(unsigned char *out_c)
{
    while (!(LPC_UART->LSR & 0x01));    //RDR: Receiver Data Ready
                                        //0: RBR is empty, 1: U0RBR contains valid data
    *out_c = LPC_UART->RBR;
}