// ******************************************************************************************* //
// Include file for PIC24FJ64GA002 microcontroller. This include file defines
// MACROS for special function registers (SFR) and control bits within those
// registers.

#include "p24fj64ga002.h"
#include <stdio.h>

// ******************************************************************************************* //
// Configuration bits for CONFIG1 settings. 
//
// Make sure "Configuration Bits set in code." option is checked in MPLAB.
// This option can be set by selecting "Configuration Bits..." under the Configure
// menu in MPLAB.
//
// These settings are appropriate for debugging the PIC microcontroller. If you need to 
// program the PIC for standalone operation, change the COE_ON option to COE_OFF.

_CONFIG1( JTAGEN_OFF & GCP_OFF & GWRP_OFF & 
          BKBUG_ON & COE_ON & ICS_PGx1 & 
          FWDTEN_OFF & WINDIS_OFF & FWPSA_PR128 & WDTPS_PS32768 )

// ******************************************************************************************* //
// Configuration bits for CONFIG2 settings.
// Make sure "Configuration Bits set in code." option is checked in MPLAB. 
// This option can be set by selecting "Configuration Bits..." under the Configure
// menu in MPLAB.

_CONFIG2( IESO_OFF & SOSCSEL_SOSC & WUTSEL_LEG & FNOSC_PRIPLL & FCKSM_CSDCMD & OSCIOFNC_OFF &
          IOL1WAY_OFF & I2C1SEL_PRI & POSCMOD_XT )

// ******************************************************************************************* //
// Defines to simply UART's baud rate generator (BRG) regiser
// given the osicllator freqeuncy and PLLMODE.

#define XTFREQ          7372800         	  // On-board Crystal frequency
#define PLLMODE         4               	  // On-chip PLL setting (Fosc)
#define FCY             (XTFREQ*PLLMODE)/2    // Instruction Cycle Frequency (Fosc/2)

#define BAUDRATE         115200       
#define BRGVAL          ((FCY/BAUDRATE)/16)-1 

// ******************************************************************************************* //

void DebounceDelay() {

	// TODO: Use Timer 1 to create a precise 5 ms delay.
}

// ******************************************************************************************* //

int main(void)
{
	// ****************************************************************************** //
	// Setup the UART to enable use of  printf() for debugging your code, if needed. 
	//
	// printf by default is mapped to serial communication using UART1.
	// NOTES:
	//        1. You must specify a heap size for printf. This is required
	//           becuase printf needs to allocate its own memory, which is
	//           allocated on the heap. This can be set in MPLAB by:
	//           a.) Selecting Build Options...->Project from the Project menu.
	//           b.) Selecting the MPLABLINK30 Tab.
	//           c.) Entering the size of heap, e.g. 512, under Heap Size
	//        2. printf function is advanced and using printf may require 
	//           significant code size (6KB-10KB).   

	// RPINR18 is a regsiter for selectable input mapping (see Table 10-2) for 
	// for UART1. U1RX is 8 bit value used to specifiy connection to which
	// RP pin. RP9 is used for this configuration. Physical Pin 18.
	RPINR18bits.U1RXR = 9;	

	// RPOR4 is a register for selctable ouput mapping (see Regsiter 1019) for
	// pins RP9 and RP8. The register for RP8 is assigned to 3 to connect 
	// the U1TX output for UART1 (see table 10-3). Physical Pin 17.
	RPOR4bits.RP8R = 3;		

	// Set UART1's baud rate generator register (U1BRG) to the value calculated above.
	U1BRG  = BRGVAL;

	// Set UART1's mode register to 8-bit data, no parity, 1 stop bit, enabled.
	//     UARTEN        = 1     (enable UART)
	//     PDSEL1:PDSEL0 = 00    (8-bit data, no parity)
	//     STSEL         = 0     (1 stop bit)
	U1MODE = 0x8000; 		

	// Set UART2's status and control register
	//     UTXISEL1:UTXISEL0 = 00    (U1TXIF set when character 
	//                                written to trasmit buffer)
	//     UTXEN             = 1     (trasnmit enabled)
	//     URXISEL1:URXISEL0 = 01    (U1RXIF set when any character 
	//                                is received in receive buffer)
	//     RIDLE             = 0     (Receiver is active)
	U1STA  = 0x0440; 		// Reset status register and enable TX & RX

	// Clear the UART RX interrupt flag. Althouhg we are not using a ISR for 
	// the UART receive, the UART RX interrupt flag can be used to deermine if 
	// we have recived a character from the UART. 
	IFS0bits.U1RXIF = 0;

	// ****************************************************************************** //

	// TODO: Configure AD1PCFG register for configuring input pins between analog input
	// and digital IO.

	// TODO: Configure TRIS register bits for Right and Left LED outputs.

	// TODO: Configure LAT register bits to initialize Right LED to on.

	// TODO: Configure ODC register bits to use open drain configuration for Right
	// and Left LED output.

	// TODO: Configure TRIS register bits for swtich input.

	// TODO: Configure CNPU register bits to enable internal pullup resistor for switch 
	// input.

	// TODO: Setup Timer 1 to use internal clock (Fosc/2).

	// TODO: Setup Timer 1's prescaler to 1:256.

 	// TODO: Set Timer 1 to be initially off.

	// TODO: Clear Timer 1 value and reset interrupt flag		

	// TODO: Set Timer 1's period value regsiter to value for 5 ms. 

	while(1)
	{
		// TODO: For each distinct button press, alternate which
		// LED is illumintate (on).

		// TODO: Use DebounceDelay() function to debounce button press 
		// and button release in software.
	}
	return 0;
}

// ******************************************************************************************* //