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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <unistd.h>
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4 #include <sys/ioctl.h>
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5 #include <asm/io.h>
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6 #include <fcntl.h>
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7 #include <Python.h>
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8
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9 int getparport() {
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10 if( ioperm(888,3,1) ) {
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11 printf("Couldn't get parallel port at 888-890\n");
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12
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13 // the following doesn't have any effect!
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14 PyErr_SetString(PyExc_IOError,"Couldn't get parallel port at 888-890");
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15 return 0;
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16 }
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17 return 1;
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18 }
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19
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20 void outdata(unsigned char val) {
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21 outb(val,888);
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22 }
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23
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24 void outcontrol( unsigned char val ) {
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25 outb(val,890);
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26 }
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27
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28 void outbyte( unsigned char val ) {
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29 // set data, raise clock, lower clock
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30 outdata(val);
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31 outcontrol(2);
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32 outcontrol(2);
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33 outcontrol(2);
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34 outcontrol(2);
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35 outcontrol(2);
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36 outcontrol(2);
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37 outcontrol(2);
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38 outcontrol(2);
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39 outcontrol(2);
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40 outcontrol(2);
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41 outcontrol(2);
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42 outcontrol(2);
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43 outcontrol(2);
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44 outcontrol(2);
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45 outcontrol(2);
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46 outcontrol(2);
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47 outcontrol(2);
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48 outcontrol(2);
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49 outcontrol(2);
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50 outcontrol(2);
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51 outcontrol(2);
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52 outcontrol(2);
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53 outcontrol(2);
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54 outcontrol(2);
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55 outcontrol(2);
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56 outcontrol(2);
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57 outcontrol(3);
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58 }
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59 void outstart() {
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60 // send start code: pin 14 high, 5ms to let a dmx cycle finish,
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61 // then pin14 low (pin1 stays low)
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62 outcontrol(1);
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63 usleep(5000);
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64 outcontrol(3);
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65 }
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