Last change
on this file since 548 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.6 KB
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1 | /* op50nled.c -- fucntions that manipulate the LEDs. |
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2 | * |
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3 | * Copyright (c) 1995 Cygnus Support |
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4 | * |
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5 | * The authors hereby grant permission to use, copy, modify, distribute, |
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6 | * and license this software and its documentation for any purpose, provided |
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7 | * that existing copyright notices are retained in all copies and that this |
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8 | * notice is included verbatim in any distributions. No written agreement, |
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9 | * license, or royalty fee is required for any of the authorized uses. |
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10 | * Modifications to this software may be copyrighted by their authors |
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11 | * and need not follow the licensing terms described here, provided that |
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12 | * the new terms are clearly indicated on the first page of each file where |
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13 | * they apply. |
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14 | */ |
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15 | #include "op50n.h" |
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16 | |
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17 | void zylons(); |
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18 | void strobe(); |
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19 | void led_putnum(); |
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20 | void delay(); |
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21 | |
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22 | /* |
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23 | * led_putnum -- print a hex number on the LED. the value of num must be a byte. |
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24 | * The max number 15, since the front panel only has 4 LEDs. |
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25 | */ |
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26 | void |
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27 | led_putnum ( num ) |
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28 | char num; |
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29 | { |
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30 | static unsigned char *leds = (unsigned char *)LED_ADDR; |
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31 | |
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32 | /** *leds = (num << 4); **/ |
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33 | *leds = num; |
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34 | } |
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35 | |
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36 | /* |
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37 | * strobe -- do a zylons thing, toggling each led in sequence forever... |
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38 | */ |
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39 | void |
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40 | zylons() |
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41 | { |
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42 | while (1) { |
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43 | strobe(); |
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44 | } |
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45 | } |
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46 | |
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47 | /* |
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48 | * strobe -- toggle each led in sequence up and back once. |
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49 | */ |
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50 | void |
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51 | strobe() |
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52 | { |
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53 | static unsigned char curled; |
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54 | static unsigned char dir; |
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55 | |
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56 | curled = 1; |
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57 | dir = 0; |
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58 | while (curled != 0) { |
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59 | led_putnum (curled); |
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60 | delay (70000); |
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61 | if (dir) |
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62 | curled >>= 1; |
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63 | else |
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64 | curled <<= 1; |
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65 | |
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66 | if (curled == 0x100) { |
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67 | dir = ~dir; |
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68 | } |
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69 | } |
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70 | curled = 1; |
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71 | dir = 0; |
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72 | } |
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73 | |
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74 | void |
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75 | delay (x) |
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76 | int x; |
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77 | { |
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78 | int y = 17; |
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79 | while (x-- !=0) |
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80 | y = y^2; |
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81 | } |
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