Hitech C bietet eine Delay-Routine mit
ihren Samples an.. Falls du sie
nicht finden kannst :
Der Source-Code :
1 | #include "delay.h"
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2 |
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3 | void
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4 | DelayMs(unsigned char cnt)
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5 | {
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6 | #if XTAL_FREQ <= 2MHZ
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7 | do {
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8 | DelayUs(996);
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9 | } while(--cnt);
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10 | #endif
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11 |
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12 | #if XTAL_FREQ > 2MHZ
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13 | unsigned char i;
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14 | do {
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15 | i = 4;
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16 | do {
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17 | DelayUs(250);
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18 | } while(--i);
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19 | } while(--cnt);
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20 | #endif
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21 | }
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Die Header-Datei :
1 | /*
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2 | * Delay functions for HI-TECH C on the PIC
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3 | *
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4 | * Functions available:
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5 | * DelayUs(x) Delay specified number of microseconds
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6 | * DelayMs(x) Delay specified number of milliseconds
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7 | *
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8 | * Note that there are range limits: x must not exceed 255 - for xtal
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9 | * frequencies > 12MHz the range for DelayUs is even smaller.
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10 | * To use DelayUs it is only necessary to include this file; to use
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11 | * DelayMs you must include delay.c in your project.
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12 | *
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13 | */
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14 |
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15 | /* Set the crystal frequency in the CPP predefined symbols list in
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16 | HPDPIC, or on the PICC commmand line, e.g.
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17 | picc -DXTAL_FREQ=4MHZ
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18 |
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19 | or
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20 | picc -DXTAL_FREQ=100KHZ
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21 |
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22 | Note that this is the crystal frequency, the CPU clock is
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23 | divided by 4.
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24 |
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25 | * MAKE SURE this code is compiled with full optimization!!!
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26 |
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27 | */
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28 |
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29 | #ifndef XTAL_FREQ
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30 | #define XTAL_FREQ 4MHZ /* Crystal frequency in MHz */
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31 | #endif
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32 |
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33 | #define MHZ *1000L /* number of kHz in a MHz */
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34 | #define KHZ *1 /* number of kHz in a kHz */
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35 |
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36 | #if XTAL_FREQ >= 12MHZ
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37 |
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38 | #define DelayUs(x) { unsigned char _dcnt; \
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39 | _dcnt = (x)*((XTAL_FREQ)/(12MHZ)); \
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40 | while(--_dcnt != 0) \
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41 | continue; }
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42 | #else
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43 |
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44 | #define DelayUs(x) { unsigned char _dcnt; \
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45 | _dcnt = (x)/((12MHZ)/(XTAL_FREQ))|1; \
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46 | while(--_dcnt != 0) \
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47 | continue; }
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48 | #endif
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49 |
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50 | extern void DelayMs(unsigned char);
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Wenn du das alles sauber eingebunden hast,
kannst du mit
DelayMs(100); // 100ms Delay
den Hamster halten lassen..
Schöner wärs natürlich mit Timers, aber first things first.. :-)
Fiel schbass
