/*-- 
Company:.... AtomSoft 
Author:..... Jason Lopez 
  --*/
/*--  Please download --- UM10139: Volume 1: LPC214x User Manual  --*/
/*--  As i will refer to it for more info here...  --*/

#include <LPC214x.h>

/*--  We use defines to make the code easy to see and change in the future  --*/
/*--  Here i am defining 1 LED as a number. The number is the bit/pin that   --*/
/*--  the LED is connect to on the IC.   --*/
#define LED1  10      /*--  Replace LED1 with 10  --*/

/*--  This will Return (0/1) the value of the bit number specified in the variable  --*/
/*--  This is done by getting the current value of the VAR and AND'ing it with  --*/
/*--  the value of 1 shifted to the left by the bit number. 

    EX: GETBIT(someVar,1) 
    Where someVar is originally 0x03 aka 0b00000011

    Would Produce:  0x01  
 --*/
#define GETBIT(var,bit) (((var)>>(bit))&1)      

/*--  This will SET (1) the value of the specified bit in the variable  --*/
/*--  This is done by getting the current value of the VAR and OR'ing it with  --*/
/*--  the value of 1 shifted to the left by the bit number.

    EX: SETBIT(someVar,2) 
    Where someVar is originally 0x03 aka 0b00000011

    Would Produce:  0x07 aka 0b00000111 
 --*/
#define SETBIT(var,bit) ((var)|=(1<<(bit)))		

/*--  This will Clear (0) the value of the specified bit in the variable  --*/
/*--  This is done by getting the current value of the VAR and AND'ing it with  --*/
/*--  the "opposite" (~) value of 1 shifted to the left by the bit number. 

    EX: CLRBIT(someVar,2) 
    Where someVar is originally 0x07 aka 0b00000111

    Would Produce: 0x03 aka 0b00000011 
 --*/
#define CLRBIT(var,bit) ((var)&=(~(1<<(bit))))		

/*--  Prototypes  --*/
void Initialize(void);
int main(void);

/*--  Initialize is used to set the speed of the CPU and any other init. settings --*/
/*--  This can be named anything but Initialize is a standard  --*/
void Initialize(void)  {

    PLL0CON=0x0;      /*--  Disable the PLL  --*/
    PLL0FEED=0xAA;    /*--  These 2 lines are the feed lines  --*/
    PLL0FEED=0x55;    /*--  These are a REQUIRED part of the PLL SETUP  --*/
 
    VPBDIV=0x00;      /*--   Setting peripheral Clock (pclk) to System Clock (cclk)  --*/
}

/*--  Main is the program start. This is where you start it all  --*/
int main(void){
    int x;            /*--  Local Variable. Using this one for local loops  --*/

    Initialize();     /*--  Call our Initialize Function/Prototype  --*/

    /*--  PINSELx is used to setup the pins usage.  --*/
    /*--  In the manual starting on page: 76  --*/
    /*--  You will see for each pin in the PINSELx register there are 2 bits to set its purpose  --*/
    /*--  For example on page 76 you will see that pin ( P0.1 ) can be used for 4 different things  --*/
    /*   
      00 = GPIO Port........ is general Input or Ouput Pin...On most if not all this is always 00
      01 = RxD (UART0)...... is UART0 Recieve Data Pin
      10 = PWM3............. is Pulse Width Modulation Pin #3
      11 = EINT0............ is External Interrupt Pin #0
    */    
    /*--  Knowing this you can easily set the bits in the register  --*/
    /*--  Since all we need for this lesson is to blink a LED then GPIO for all  --*/

    PINSEL0=0x00000000;     /*--  Set all pins as GPIO pins  --*/

    /*--  IODIRx is used to setup the pins direction. Input/Output  --*/
    /*--  Page 83 refers to this as:  --*/
    /* 
    8.4.1 GPIO port Direction register (IODIR, Port 0: IO0DIR - 0xE002 8008 and
          Port 1: IO1DIR - 0xE002 8018; FIODIR, Port 0: FIO0DIR - 0x3FFF C000
          and Port 1:FIO1DIR - 0x3FFF C020)
    */  
    /*--  One of the cool things is that the header LPC214x.h lets you use IOxDIR or IODIRx   --*/
    /*--  Where x is the port aka 0 or 1  --*/
    /*--  You can see how confusing it would be to use IO0DIR instead of IODIR0 hence the below code  --*/
    
    /*--  Note that when you set a 1 to any bit in this variable it sets the coresponding pin to output  --*/
    /*--  and when you set it to a 0 you can guess what will happen... its a input.  --*/

    IODIR0=0xFFFFFFFF;    /*--  Set all pins as output pins  --*/

/*--  Almost all programs have this while(1) loop. This is a endless loop.  --*/
    while(1){
      SETBIT(IOPIN0,LED1);    /*--  This will set the pin/bit LED1 (10) on IOPIN0 hence sending a 1 (HIGH)   --*/
      for(x=0;x<100000;x++);  /*--  This is a loop for xxxx ticks. Its a rough count  --*/

      CLRBIT(IOPIN0,LED1);    /*--  This will clear the pin/bit LED1 (10) on IOPIN0 hence sending a 0 (LOW)   --*/
      for(x=0;x<100000;x++);  /*--  This is a loop for xxxx ticks. Its a rough count  --*/
    }

}

 /*--
Company:.... AtomSoft 
Author:..... Jason Lopez 
 --*/ 
 /*-- Please download --- UM10139: Volume 1: LPC214x User Manual --*/ 
 /*-- As i will refer to it for more info here... --*/ 

#include <LPC214x.h>

 /*-- We use defines to make the code easy to see and change in the future --*/ 
 /*-- Here i am defining 1 LED as a number. The number is the bit/pin that  --*/ 
 /*-- the LED is connect to on the IC.  --*/ 
#define LED1  10       /*-- Replace LED1 with 10 --*/ 

 /*-- This will Return (0/1) the value of the bit number specified in the variable --*/ 
 /*-- This is done by getting the current value of the VAR and AND'ing it with --*/ 
 /*-- the value of 1 shifted to the left by the bit number. 

    EX: GETBIT(someVar,1) 
    Where someVar is originally 0x03 aka 0b00000011

    Would Produce:  0x01  
--*/ 
#define GETBIT(var,bit) (((var)>>(bit))&1)      

 /*-- This will SET (1) the value of the specified bit in the variable --*/ 
 /*-- This is done by getting the current value of the VAR and OR'ing it with --*/ 
 /*-- the value of 1 shifted to the left by the bit number.

    EX: SETBIT(someVar,2) 
    Where someVar is originally 0x03 aka 0b00000011

    Would Produce:  0x07 aka 0b00000111 
--*/ 
#define SETBIT(var,bit) ((var)|=(1<<(bit)))		

 /*-- This will Clear (0) the value of the specified bit in the variable --*/ 
 /*-- This is done by getting the current value of the VAR and AND'ing it with --*/ 
 /*-- the "opposite" (~) value of 1 shifted to the left by the bit number. 

    EX: CLRBIT(someVar,2) 
    Where someVar is originally 0x07 aka 0b00000111

    Would Produce: 0x03 aka 0b00000011 
--*/ 
#define CLRBIT(var,bit) ((var)&=(~(1<<(bit))))		

 /*-- Prototypes --*/ 
void Initialize(void);
int main(void);

 /*-- Initialize is used to set the speed of the CPU and any other init. settings--*/ 
 /*-- This can be named anything but Initialize is a standard --*/ 
void Initialize(void)  {

    PLL0CON=0x0;       /*-- Disable the PLL --*/ 
    PLL0FEED=0xAA;     /*-- These 2 lines are the feed lines --*/ 
    PLL0FEED=0x55;     /*-- These are a REQUIRED part of the PLL SETUP --*/ 
 
    VPBDIV=0x00;       /*--  Setting peripheral Clock (pclk) to System Clock (cclk) --*/ 
}

 /*-- Main is the program start. This is where you start it all --*/ 
int main(void){
    int x;             /*-- Local Variable. Using this one for local loops --*/ 

    Initialize();      /*-- Call our Initialize Function/Prototype --*/ 

     /*-- PINSELx is used to setup the pins usage. --*/ 
     /*-- In the manual starting on page: 76 --*/ 
     /*-- You will see for each pin in the PINSELx register there are 2 bits to set its purpose --*/ 
     /*-- For example on page 76 you will see that pin ( P0.1 ) can be used for 4 different things --*/ 
     /*
      00 = GPIO Port........ is general Input or Ouput Pin...On most if not all this is always 00
      01 = RxD (UART0)...... is UART0 Recieve Data Pin
      10 = PWM3............. is Pulse Width Modulation Pin #3
      11 = EINT0............ is External Interrupt Pin #0
    */ 
     /*-- Knowing this you can easily set the bits in the register --*/ 
     /*-- Since all we need for this lesson is to blink a LED then GPIO for all --*/ 

    PINSEL0=0x00000000;      /*-- Set all pins as GPIO pins --*/ 

     /*-- IODIRx is used to setup the pins direction. Input/Output --*/ 
     /*-- Page 83 refers to this as: --*/ 
     /*
    8.4.1 GPIO port Direction register (IODIR, Port 0: IO0DIR - 0xE002 8008 and
          Port 1: IO1DIR - 0xE002 8018; FIODIR, Port 0: FIO0DIR - 0x3FFF C000
          and Port 1:FIO1DIR - 0x3FFF C020)
    */ 
     /*-- One of the cool things is that the header LPC214x.h lets you use IOxDIR or IODIRx  --*/ 
     /*-- Where x is the port aka 0 or 1 --*/ 
     /*-- You can see how confusing it would be to use IO0DIR instead of IODIR0 hence the below code --*/ 
    
     /*-- Note that when you set a 1 to any bit in this variable it sets the coresponding pin to output --*/ 
     /*-- and when you set it to a 0 you can guess what will happen... its a input. --*/ 

    IODIR0=0xFFFFFFFF;     /*-- Set all pins as output pins --*/ 

     /*-- Almost all programs have this while(1) loop. This is a endless loop. --*/ 
    while(1){
      SETBIT(IOPIN0,LED1);     /*-- This will set the pin/bit LED1 (10) on IOPIN0 hence sending a 1 (HIGH)  --*/ 

       /*-- A for loop like: for(x=0;x<1;x++); with 1 takes approx 12 cycles to complete.............. --*/ 
       /*-- A loop with 2 takes 25 Cycles know this we can calculate how long it will take for 500ms.. --*/ 
       /*-- Since we are at 12 MHz thats 12,000,000 Cycles for 1 second. So it would take............. --*/ 
       /*-- 6,000,000 cycles for 500mSaka 1/2 second delay and since the loop takes 12-13 cycles for 1 --*/ 
       /*-- 6,000,000 / 12 = 500000..... So we will use 500000 for our loop........................... --*/ 

       /*-- If you should need exact timing i suggest you create a delay function and make sure........--*/ 
       /*-- that it is delaying 6,000,000 cycles. This will do about 4,500,009 cycles due to the.......--*/ 
       /*-- compiler optimizing the code it will run the empty loop quicker                    ........--*/ 
       /*-- You have to manually ajust the number. I found that 666666 would gibe me 6,000,003 cycles..--*/ 

      for(x=0;x<666666;x++);   /*-- This is a loop for 666666 cycles aka instructions. 500mS --*/ 

      CLRBIT(IOPIN0,LED1);     /*-- This will clear the pin/bit LED1 (10) on IOPIN0 hence sending a 0 (LOW)  --*/ 
      for(x=0;x<666666;x++);   /*-- This is a loop for 666666 cycles aka instructions. 500mS --*/ 
    }

}