Hallo,
ich habe ein kleines Problerm beim Lesen eines Eingangs bei einem
PIC16F887.
Zum Testen will ich einfach nur eine LED leuchten lassen wenn ein Taster
gedrückt wird. Also was ganz banales. Die LED hängt an Portbit D7, sie
leuchtet auch wenn ich sie per Software ansteuere. Der Taster hängt an
B4 und ist so verdrahtet, dass er im gedrückten Zustand 5 V an den Pin
legt. Mit dem Multimeter gemessen funktioniert das auch. Aber die
Software will halt nicht.....
1 | /******************************************************************************/
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2 | /* Files to Include */
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3 | /******************************************************************************/
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4 |
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5 | #include <xc.h> /* XC8 General Include File */
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6 | #define _XTAL_FREQ 20000000
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7 |
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8 | #include <pic.h>
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9 | //#include <stdlib.h>
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10 | #include <stdio.h>
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11 | #include <stdint.h> /* For uint8_t definition */
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12 | #include <stdbool.h> /* For true/false definition */
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13 | #include "Main.h"
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14 |
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15 | /******************************************************************************/
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16 | /* User Global Variable Declaration */
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17 | /******************************************************************************/
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18 |
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19 | //
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20 | // PROCESSOR : PIC16F877A
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21 |
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22 | #pragma config FOSC = INTRC_NOCLKOUT// Oscillator Selection bits (INTOSCIO oscillator: I/O function on RA6/OSC2/CLKOUT pin, I/O function on RA7/OSC1/CLKIN)
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23 | #pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled and can be enabled by SWDTEN bit of the WDTCON register)
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24 | #pragma config PWRTE = ON // Power-up Timer Enable bit (PWRT enabled)
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25 | #pragma config MCLRE = ON // RE3/MCLR pin function select bit (RE3/MCLR pin function is MCLR)
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26 | #pragma config CP = OFF // Code Protection bit (Program memory code protection is disabled)
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27 | #pragma config CPD = OFF // Data Code Protection bit (Data memory code protection is disabled)
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28 | #pragma config BOREN = ON // Brown Out Reset Selection bits (BOR enabled)
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29 | #pragma config IESO = ON // Internal External Switchover bit (Internal/External Switchover mode is enabled)
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30 | #pragma config FCMEN = ON // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is enabled)
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31 | #pragma config LVP = OFF // Low Voltage Programming Enable bit (RB3 pin has digital I/O, HV on MCLR must be used for programming)
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32 |
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33 | // CONFIG2
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34 | #pragma config BOR4V = BOR40V // Brown-out Reset Selection bit (Brown-out Reset set to 4.0V)
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35 | #pragma config WRT = OFF // Flash Program Memory Self Write Enable bits (Write protection off)
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36 |
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37 |
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38 |
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39 | int main()
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40 | {
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41 | Init();
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42 |
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43 | // PORTDbits.RD7 = 1;
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44 |
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45 | while (1)
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46 | {
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47 | if (PORTBbits.RB4)
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48 | PORTDbits.RD7 = 1;
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49 | else
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50 | PORTDbits.RD7 = 0;
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51 | }
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52 | }
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53 |
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54 | /////////////////////////////////////////////////////////////////////
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55 | // Initialisierungen
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56 | /////////////////////////////////////////////////////////////////////
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57 | void Init(void)
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58 | {
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59 | TRISB = 0xff;
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60 | PORTD = 0x0;
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61 | TRISD = 0x0;
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62 | TRISE = 0xff;
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63 | }
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