PIC16F15214 - A simple program that simulates a standard traffic stop light with 3 LEDs.

PIC16F15214-stoplight.c

/* File: PIC16F15214-stoplight.c
 * Hardware: PIC16F15214
 * Build software: MPLAB X IDE v6.00 & XC8 v2.32
 * Author: Matt Rude <[email protected]>
 * Created on February 3, 2022, 1:11 AM
 *
 * ----------------------------------------------------------------------------
 * Description:
 *
 * A simple program that simulates a standard traffic stop light with 6 LEDs.
 *
 * ----------------------------------------------------------------------------
 * PIC16F15214 pin-out:
 *
 *                              ______
 *                 GND - VDD - |°     | - VSS - 5v+
 *       (B) Green LED - RA5 - |      | - RA0 - (A) Green LED
 *      (B) Yellow LED - RA4 - |      | - RA1 - (A) Yellow LED
 *         (B) Red LED - RA3 - |______| - RA2 - (A) Red LED
 *
 *    (Note: the dot next to the VDD pin represents the dot on the chip.)
 *
 * ----------------------------------------------------------------------------
 * MIT License:
 *
 * Copyright (c) 2022 Matt Rude <[email protected]>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#define _XTAL_FREQ 1000000          // Set CPU to 1Mhz

// PIC16F15214 Configuration Bit Settings
#pragma config FEXTOSC = OFF
#pragma config RSTOSC = HFINTOSC_1MHZ
#pragma config CLKOUTEN = OFF
#pragma config WDTE = OFF

#include <xc.h>

// Define the pins used and how they are used
#define AredLed     LATAbits.LATA2  // Set pin 0 as the Red LED
#define AyellowLed  LATAbits.LATA1  // Set pin 1 as the Yellow LED
#define AgreenLed   LATAbits.LATA0  // Set pin 2 as the Green LED
#define BredLed     LATAbits.LATA5  // Set pin 5 as the Red LED
#define ByellowLed  LATAbits.LATA4  // Set pin 4 as the Yellow LED
#define BgreenLed   LATAbits.LATA3  // Set pin 3 as the Green LED

int main()
{
    TRISA        = 0x0;             // Set all pins as output

    AredLed      = 1;               // Start with everything off but the
    AyellowLed   = 0;               //  - red LEDs for 5 seconds.
    AgreenLed    = 0;
    BredLed      = 1;
    ByellowLed   = 0;
    BgreenLed    = 0;
    
    __delay_ms(5000);               // Wait 5 seconds with all directions red

    while (1)
    {
        // Direction A "Green"
        AredLed    = 0;
        AgreenLed  = 1;
        __delay_ms(9500);           // 9.5 Seconds Delay

        // Direction A "Yellow"
        AgreenLed  = 0;
        AyellowLed = 1;
        __delay_ms(5000);           // 5 Seconds Delay

        // Direction A "Red"
        AyellowLed = 0;
        AredLed    = 1;
        __delay_ms(500);            // half a second Delay
        
        /*********************************************************************/
        
        // Direction B "Green"
        BredLed    = 0;
        BgreenLed  = 1;
        __delay_ms(9500);           // 9.5 Seconds Delay

        // Direction B "Yellow"
        BgreenLed  = 0;
        ByellowLed = 1;
        __delay_ms(5000);           // 5 Seconds Delay

        // Direction B "Red"
        ByellowLed = 0;
        BredLed    = 1;
        __delay_ms(500);            // half a second Delay
    }

    return 0;
}