如何使PIC16F18856的RB2产生方波输出

您好，下面的代码仅仅是为了在PIC16F18856的RB2上产生一个方波输出。这样我们就可以测试RB2驱动的OPTO的输出是否有足够快的上升/下降时间。它是用XC8C和MPLAB X编写的。它建立了OK，但是你知道我如何设置这个定时器吗？Aymis（3）命令？另外，你认为我正确地设置了寄存器吗？我们不能测试，直到我们在星期一的董事会，但我们需要它准备好。



      以下为原文

    Hello,
The following code is simply meant to produce a square wave output on RB2 of PIC16F18856.
This is so we can test if the output of the opto that RB2  drives into has a quick enough rise/fall  time.
It is written in XC8 C and MPLAB X.
It builds OK but do you know  how i set up the timer for the __delay_ms(3) command?
Also, do you think ive set up the registers correctly.
We cant test it till we get the boards in on Monday, but we need it ready.
//This code simply puts out a square wave on RB2
//Period = 3ms

//PIC16F18856
//XC8 compiler
//MPLAB X V3.61



// PIC16F18856 Configuration Bit Settings

// 'C' source line config statements

// CONFIG1
#pragma config FEXTOSC = OFF // External Oscillator mode selection bits (Oscillator not enabled)
#pragma config RSTOSC = EXT1X // Power-up default value for COSC bits (EXTOSC operating per FEXTOSC bits)
#pragma config CLKOUTEN = OFF // Clock Out Enable bit (CLKOUT function is disabled; i/o or oscillator function on OSC2)
#pragma config CSWEN = ON // Clock Switch Enable bit (Writing to NOSC and NDIV is allowed)
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable bit (FSCM timer disabled)

// CONFIG2
#pragma config MCLRE = OFF // Master Clear Enable bit (MCLR pin function is port defined function)
#pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config LPBOREN = OFF // Low-Power BOR enable bit (ULPBOR disabled)
#pragma config BOREN = OFF // Brown-out reset enable bits (Brown-out reset disabled)
#pragma config BORV = LO // Brown-out Reset Voltage Selection (Brown-out Reset Voltage (VBOR) set to 1.9V on LF, and 2.45V on F Devices)
#pragma config ZCD = ON // Zero-cross detect disable (Zero-cross detect circuit is always enabled)
#pragma config PPS1WAY = OFF // Peripheral Pin Select one-way control (The PPSLOCK bit can be set and cleared repeatedly by software)
#pragma config STVREN = OFF // Stack Overflow/Underflow Reset Enable bit (Stack Overflow or Underflow will not cause a reset)

// CONFIG3
#pragma config WDTCPS = WDTCPS_31// WDT Period Select bits (Divider ratio 1:65536; software control of WDTPS)
#pragma config WDTE = OFF // WDT operating mode (WDT Disabled, SWDTEN is ignored)
#pragma config WDTCWS = WDTCWS_7// WDT Window Select bits (window always open (100%); software control; keyed access not required)
#pragma config WDTCCS = SC // WDT input clock selector (Software Control)

// CONFIG4
#pragma config WRT = OFF // UserNVM self-write protection bits (Write protection off)
#pragma config SCANE = not_available// Scanner Enable bit (Scanner module is not available for use)
#pragma config LVP = OFF // Low Voltage Programming Enable bit (High Voltage on MCLR/Vpp must be used for programming)

// CONFIG5
#pragma config CP = OFF // UserNVM Program memory code protection bit (Program Memory code protection disabled)
#pragma config CPD = OFF // DataNVM code protection bit (Data EEPROM code protection disabled)

// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.

#include
#include

#define _XTAL_FREQ 4000000

    uint8_t count;

void main(void) {
   
    //Setup ports
        TRISA = 0x30; //ADC INS
        TRISB = 0x08; //ZCD & DALIRX
        TRISC = 0x0C; //SELECT
        
        ANSELA = 0x00; //ADC INs
        ANSELB = 0x00;
        ANSELC = 0x00;
        
        WPUA = 0x00;
        ODCONA = 0x00;
        SLRCONA = 0x00;
        INLVLA = 0x00; //ST?
        CCDPA = 0x00;
        CCDNA = 0x00;
        
        WPUB = 0x00;
        ODCONB = 0x00;
        SLRCONB = 0x00;
        INLVLB = 0x00; //ST?
        CCDPB = 0x00;
        CCDNB = 0x00;
        
        WPUC = 0x00;
        ODCONC = 0x00;
        SLRCONC = 0x00;
        INLVLC = 0x00; //ST?
        CCDPC = 0x00;
        CCDNC = 0x00;
        
        INTCON = 0x00;
      
        CM1CON0 = 0x00;
        CM1CON1 = 0x00;
        CM2CON0 = 0x00;
        CM2CON1 = 0x00;

        PWM6CON = 0x00;
        PWM7CON = 0x00;
        
        ZCDCON = 0x00;
        
        //Initialize ports
        LATAbits.LATA0 = 0;
        LATAbits.LATA1 = 0;
        LATAbits.LATA2 = 0;
        LATAbits.LATA3 = 0;
        //LATAbits.LATA4 = 0; temp sensor input
        //LATAbits.LATA5 = 0; light sensor input
        LATAbits.LATA6 = 0;
        LATAbits.LATA7 = 0;
                  
        //LATBbits.LATB0 = 0; zero crossing input
        LATBbits.LATB1 = 0;
        LATBbits.LATB2 = 0; //dali TX pin
        //LATBbits.LATB3 = 0; dali RX pin
        LATBbits.LATB4 = 0;
        LATBbits.LATB5 = 0;
        LATBbits.LATB6 = 0;
        LATBbits.LATB7 = 0;
               
        LATCbits.LATC0 = 0;
        LATCbits.LATC1 = 0;
        //LATCbits.LATC2 = 0; pulldown resistor
        //LATCbits.LATC3 = 0; pulldown resistor
        LATCbits.LATC4 = 0;
        LATCbits.LATC5 = 0;
        LATCbits.LATC6 = 0;
        LATCbits.LATC7 = 0;
               
    //5 second delay
    for (count=1;count<=50;count++) {
    __delay_ms(100);
    }

while(1){
        LATBbits.LATB2 = 0;
        __delay_ms(3);
        LATBbits.LATB2 = 1;
        __delay_ms(3);
}

    return;
}

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