/* * File: 16F1829IRTest1.c * Author: JaysWoodshop * PIC 16F1829 * Created on Jan. 23, 2016 * * *****************************************************************************/ /* Files to Include */ /******************************************************************************/ #include #define _XTAL_FREQ 4000000 //4MHz // CONFIG1 #pragma config FOSC = INTOSC // Oscillator Selection (INTOSC oscillator: I/O function on CLKIN pin) #pragma config WDTE = OFF // Watchdog Timer Enable (WDT disabled) #pragma config PWRTE = OFF // Power-up Timer Enable (PWRT disabled) #pragma config MCLRE = ON // MCLR Pin Function Select (MCLR/VPP pin function is MCLR) #pragma config CP = OFF // Flash Program Memory Code Protection (Program memory code protection is disabled) #pragma config CPD = OFF // Data Memory Code Protection (Data memory code protection is disabled) #pragma config BOREN = OFF // Brown-out Reset Enable (Brown-out Reset disabled) #pragma config CLKOUTEN = OFF // Clock Out Enable (CLKOUT function is disabled. I/O or oscillator function on the CLKOUT pin) #pragma config IESO = OFF // Internal/External Switchover (Internal/External Switchover mode is disabled) #pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable (Fail-Safe Clock Monitor is disabled) // CONFIG2 #pragma config WRT = OFF // Flash Memory Self-Write Protection (Write protection off) #pragma config PLLEN = OFF // PLL Enable (4x PLL disabled) #pragma config STVREN = OFF // Stack Overflow/Underflow Reset Enable (Stack Overflow or Underflow will not cause a Reset) #pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (Vbor), low trip point selected.) #pragma config LVP = OFF // Low-Voltage Programming Enable (High-voltage on MCLR/VPP must be used for programming) //=============================== //Various defines #define IRR1 PORTAbits.RA4 // IR Receiver Output pin 3 #define IRR2 PORTAbits.RA5 // IR Receiver Output pin 2 //#define RELAY LATAbits.LATA4 // Relay transistor pin 3 #define IRT1 LATCbits.LATC6 // IR LED Transmit pin 8 #define GLT LATCbits.LATC7 // test LED pin 9 //=============================== //Global variables unsigned char IRR1Count; unsigned char IRR2Count; //unsigned char DelayCount; unsigned char Previous_IR1_State; // detect changes in IR beam state unsigned char Previous_IR2_State; // detect changes in IR beam state //=============================== //Initialization void init(void) { OSCCON = 0b01101000; // 4MHz HF(1)page 53 //TIMER0 - Set to count 1 seconds //rollover .524 sec. @ 500kHz = 2 count, .066 sec. @ 4MHz = 15 count INTCON = 0b00000000; // Interrupts disabled OPTION_REG = 0b00000111; //WP disabled, timer0 from instruction clock, prescaler 256 //initial state of all output pins is low LATA = 0b00000000; LATB = 0b00000000; LATC = 0b00000000; //enable all digital input buffers ANSELA = 0b00000000; ANSELB = 0b00000000; ANSELC = 0b00000000; //weak pull ups (all off WPUA = 0; WPUB = 0; WPUC = 0; //input thresholds INLVLA = 0b00111111; //all inputs use CMOS levels INLVLB = 0b11110000; //all inputs use CMOS levels INLVLC = 0b11111111; //all inputs use CMOS levels //set pin in/out directions. All out except where we need an input TRISA = 0b00110000; //RA4 are input TRISB = 0b00000000; //all outputs TRISC = 0b00000000; //all outputs /* Configure CCP4 in PWM mode to output ~38kHz @ RC6: See '1829 Data Sheet Section 24.3.2 */ TRISCbits.TRISC6 = 1; /* Disable the CCP4 pin output driver. */ T2CONbits.TMR2ON = 0b0; /* Disable Timer2 */ T2CONbits.T2CKPS = 0b00; /* ::= Timer2 pre scaler is 1 */ PR2bits.PR2 = 0x19; /* ~26 uSec @ 4 MHz Fosc */ CCPR4Lbits.CCPR4L = 0x0c; /* MSb's of the PWM duty cycle. */ CCP4CONbits.DC4B = 0b00; /* LSb's of the PWM duty cycle. */ CCP4CONbits.CCP4M = 0b1100; /* ::= CCP PWM Mode */ CCPTMRSbits.C4TSEL = 0b00; /* ::= CCP4 is based on Timer2 in PWM Mode */ T2CONbits.TMR2ON = 0b1; /* ::= Timer2 is on */ TRISCbits.TRISC6 = 0; /* Enable the CCP4 pin output driver. */ } //=============================== //Start train void open_door(void) { GLT = 1; // Test LED } //=============================== void close_door(void) { GLT = 0; // Test LED } //=============================== //Main loop // Initial conditions - No train (IR beam signal is 1 / door closed) void main(void) { init(); IRR1Count = 0; IRR2Count = 0; close_door(); Previous_IR1_State = 0; Previous_IR2_State = 0; while(1) { // ____Process IR beam state____ if(!IRR1) // If break beam use !IRR1 not // If IRR1 is seeing IR = 0 if blocked = 1 { // IR beam state is 0 if(Previous_IR1_State == 1) { // IR state changed 1 --> 0 (previous to current) --> end of car Previous_IR1_State = 0; // Current state becomes new previous state for the next loop // (re)init End Of Train detection delay //DelayCount = EOT_COUNT; } } else { // IR beam state is 1 if(Previous_IR1_State == 0) { // IR beam state changed from 0 to 1 (previous to current) --> beginning of car Previous_IR1_State = 1; // Current state becomes new previous state for the next loop IRR1Count++; } } if(!IRR2) // If break beam use !IRR1 not // If IRR1 is seeing IR = 0 if blocked = 1 { // IR beam state is 0 if(Previous_IR2_State == 1) { // IR state changed 1 --> 0 (previous to current) --> end of car Previous_IR2_State = 0; // Current state becomes new previous state for the next loop // (re)init End Of Train detection delay //DelayCount = EOT_COUNT; } } else { // IR beam state is 1 if(Previous_IR2_State == 0) { // IR beam state changed from 0 to 1 (previous to current) --> beginning of car Previous_IR2_State = 1; // Current state becomes new previous state for the next loop IRR2Count++; } } // ____Gate state control____ // Gate closed while IRR1 != IRR2 if (IRR1Count != IRR2Count) { open_door(); // Open and keep open while train is passing } else { close_door(); // Close and keep closed while no train IRR1Count = 0; IRR2Count = 0; } } // while(true) } // End of main