1 | /*
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2 | =============================================================================
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3 | wscalc.c -- MIDAS-VII waveshape editor harmonic functions
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4 | Version 9 -- 1988-09-09 -- D.N. Lynx Crowe
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5 | =============================================================================
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6 | */
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7 |
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8 | #include "ram.h"
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9 |
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10 | #define WAVESMAX 1023
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11 | #define WAVESMIN 1023
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12 |
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13 | #include "knmtab.h" /* short knmtab[NUMHARM][NUMWPCAL]; */
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14 |
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15 | /*
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16 | =============================================================================
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17 | adj() -- adjust the coefficients in vknm[wshar][] for a new value
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18 | =============================================================================
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19 | */
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20 |
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21 | void adj(int16_t wshar)
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22 | {
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23 | register int16_t wspnt;
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24 | register int32_t harval;
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25 | register int16_t *kp;
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26 | register int32_t *vp;
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27 |
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28 | vp = &vknm[wshar][0];
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29 |
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30 | harval = vmtab[wshar];
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31 |
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32 | if (harval) {
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33 |
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34 | kp = &knmtab[wshar][0];
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35 |
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36 | for (wspnt = 0; wspnt < NUMWPCAL; wspnt++)
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37 | *vp++ = *kp++ * harval;
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38 |
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39 | } else {
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40 |
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41 | for (wspnt = 0; wspnt < NUMWPCAL; wspnt++)
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42 | *vp++ = 0;
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43 | }
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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 | wadj() -- adjust the coefficients for all harmonics
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49 | =============================================================================
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50 | */
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51 |
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52 | void wadj(void)
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53 | {
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54 | register int16_t wshar;
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55 |
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56 | for (wshar = 0; wshar < NUMHARM; wshar++)
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57 | adj(wshar);
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58 | }
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59 |
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60 | /*
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61 | =============================================================================
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62 | clrwsa() -- clear waveshape table harmonic work areas
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63 | =============================================================================
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64 | */
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65 |
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66 | void clrwsa(void)
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67 | {
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68 | memsetw(offsets, 0, NUMWPCAL);
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69 | memsetw(vknm, 0, (NUMHARM * NUMWPCAL) << 1);
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70 | memsetw(vmtab, 0, NUMHARM);
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71 | }
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72 |
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73 | /*
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74 | =============================================================================
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75 | wscalc() -- calculate a waveshape from its harmonics and offsets
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76 | =============================================================================
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77 | */
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78 |
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79 | void wscalc(void)
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80 | {
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81 | register int16_t wspnt, wshar;
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82 | register int32_t hfac, hmax, temp;
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83 |
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84 | hmax = WAVESMIN; /* set minimum scaling value */
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85 |
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86 | for (wspnt = 0; wspnt < NUMWPCAL; wspnt++) {
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87 |
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88 | temp = 0; /* sum up the harmonics */
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89 |
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90 | for (wshar = 0; wshar < NUMHARM; wshar++)
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91 | temp += vknm[wshar][wspnt];
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92 |
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93 | /* add in the offsets */
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94 |
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95 | hwave[wspnt] = (temp / 100) + offsets[wspnt];
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96 |
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97 | /* adjust the maximum value seen */
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98 |
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99 | if ((temp = abs(hwave[wspnt])) > hmax)
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100 | hmax = temp;
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101 | }
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102 |
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103 | /* calculate the scale factor */
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104 |
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105 | hfac = ((int32_t)WAVESMAX << 16) / hmax;
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106 |
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107 | /* scale the waveshape */
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108 |
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109 | for (wspnt = 0; wspnt < NUMWPCAL; wspnt++)
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110 | wsbuf[wspnt] = (hwave[wspnt] * hfac) >> 16;
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111 | }
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112 |
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