/*
 Setting up a new C18 project and creating an application Tutorial
 Super simple LED blinker in C using Microchip C18 and MPLAB
 Written by Hop for digital-diy.com tutorials - May 13, 2009
 Written for the 18F452 running at 40mhz specifically. Make changes as needed for other devices
*/
 
// Include the necessary device header file
#include <p18f452.h>
 
// Configuration Bit pragma directives (see device data sheet)
#pragma config OSC = HSPLL, OSCS = OFF // HS-PLL Enabled, Internal External Osc. Switch Over OFF Disabled
#pragma config PWRT = OFF // Power Up Timer: OFF Disabled
#pragma config BOR = OFF, BORV = 25 // Brown Out Reset: OFF, Brown Out Voltage: OFF Disabled
#pragma config WDT = OFF, WDTPS = 128 // Watchdog Timer: OFF Disabled, Watchdog Postscaler: 1:128
#pragma config CCP2MUX = OFF // CCP2 Mux: OFF Disabled (RB3)
#pragma config STVR = OFF // Stack Overflow Reset: OFF Disabled
#pragma config LVP = OFF // Low Voltage ICSP:OFF Disabled
#pragma config DEBUG = OFF // Background Debugger Enable: OFF Disabled
#pragma config CP0 = OFF, CP1 = OFF, CP2 = OFF, CP3 = OFF // Code Protection Block 0-3: OFF Disabled
#pragma config CPB = OFF // Boot Block Code Protection: OFF Disabled
#pragma config CPD = OFF // Data EEPROM Code Protection: OFF Disabled
#pragma config WRT0 = OFF, WRT1 = OFF, WRT2 = OFF, WRT3 = OFF // Write Protection Block 0-3: OFF Disabled
#pragma config WRTB = OFF // Boot Block Write Protection: OFF Disabled
#pragma config WRTC = ON // Configuration Register Write Protection: OFF Disabled
#pragma config WRTD = OFF // Data EEPROM Write Protection: OFF Disabled
#pragma config EBTR0 = OFF, EBTR1 = OFF, EBTR2 = OFF, EBTR3 = OFF // Table Read Protection Block 0-3: OFF Disabled
#pragma config EBTRB = OFF // Boot Block Table Read Protection: OFF Disabled
 
// Function prototypes
void delay1(void);
 
// Main code section. Execution starts here.
void main(void){
 // First some setup code for the LED
 // The LED will be driven by port D, bit 0, driving the anode, cathode to ground
 
 // First we should clear the port D, bit 0 data latch
 LATDbits.LATD0=0;
 
 // We need to set port D, bit 0 as an output
 // Using TRISDbits instead of TRISD allows isolating a single bit leaving the other bits unchanged
 TRISDbits.TRISD0=0; // 0 = output, 1 = input
 
 // Set port D, bit 0 to off (driving the LED anode, cathode to ground)
 PORTDbits.RD0=0;
 
 // LED blinking loop that never ends since '1' never changes
 while(1){
 PORTDbits.RD0=1; // turn the LED on
 delay1(); // call the delay function
 PORTDbits.RD0=0; // turn the LED off
 delay1(); // call the delay function
 }
 // end of main, but we will never get this far (endless loop)
}
 
// Start of our functions
void delay1(void){
 /*
 It is important to note that all variable declarations need to be placed before any code in
 a function or the build will fail. 
 */
 // declare a long integer and set it to zero
 long int loop1=0;
 
 // count from zero to 30,000 then continue on
 // Lower than 30000 for a faster blink, higher for a slower blink.
 for(loop1=0;loop1<=30000;loop1++){
 /*
 FOR loops are pretty simple in C. There are three parameters in a FOR loop seperated by
 semicolons. The first parameter is what variable we want to use and what value to assign
 to it initially. The second parameter is the condition for the loop to continue looping. In
 this case, as long as loop1 is less than or equal to 30000 the loop will continue looping.
 The third parameter is what to do at each iteration of the loop. In this case, increment
 loop1 by 1 each iteration. Everything in between the curly braces is executed on each
 pass of the loop. When the test condition fails, IE: loop1 = 30001, then execution passes
 to the next statement after the close curly brace.
 */
 }
 // The loop is done and execution has moved past the loop
}