金石微開: [MCU]PIC18F45K20 Demo board LED Example

2017年10月18日星期三

[MCU]PIC18F45K20 Demo board LED Example

手邊有一組 PICkit 44-Pin Demo Board (PIC18F45K20)

這塊版子的LED在RD0~RD7

可變電阻(右上方）接在RA0

Switch Button(右下方）接在RB0

程式碼如下

#pragma config FOSC = INTIO67    // FOSC = INTIO67 Internal oscillator block
#pragma config WDTEN = OFF, LVP = OFF    // LVP = OFF Single-Supply ICSP disabled
                                         //WDTEN = OFF Watch dog timer is always disabled. SWDTEN has no effect.
 #include "p18f45k20.h"   //inclue this mcu header
 
 void delay();   
 //delay function   
 void delay() {      
    int counter = 0;   
    for (counter = 0; counter<1000; counter++);    
 }   
 void main(void) {      
    int dummy = 0;   
    /*init the RA0 as analog input*/   
    TRISA = 0x1; // set potentiometer at porta as input (only set port A0)    
    ANSELbits.ANS0 = 1; // set RA0 to analog (=1, 0 = digital) -> this is important to potentiometer  at RA0      
    ADCON0bits.ADON = 1; // activate A/D unit   
    /*init the RB0 as digital input*/   
    TRISB = 0x1; // set bit0 of portb to input because there is the push button at RB0      
    ANSELHbits.ANS12 = 0; // set RB0 to digital (=0, 1= analog) -> this is important to read button at RB0   
    /*init the RD0..RD7(PORTD) as digital output*/   
    TRISD = 0; // all bits of portd are set 0 as output      
    PORTD = 0; // deactivate all led's   
                                                                                                                                                                 
    while (1) {          
       if (PORTBbits.RB0 == 0) { //check if button is pressed (=0, 1= not pressed)                          
          ADCON0bits.GO_DONE = 1; // start A/D convert              
          while(ADCON0bits.GO_DONE != 0); // wait till A/D convert done               
          dummy = ADRESH; // copy A/D result (high part) to leds -> dummy variable is only for better debugging              
          PORTD = dummy;          
       } else {              
          PORTD = PORTD<<1; // move set led   
          if (PORTD == 0) {    
             PORTD = 0x1; // if all led's off activate one   
          }          
       }   
       delay();      
    }       
 }