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可是怎么有人说 “F2812是定点DSP，所以要让它运行小数就会丢失数据，因此就必须将数据放大，进行相应的计算，等到最终的结果在按要求缩小就可以了。一般用Q15，Q30，但是精度要求不高可以用Q15以下的”<br />我在TI公司下的程序上怎么就有小数的运算呢？<br />------------------------------------------------------------------------------ */<br /><br />#include "dmctype.h"<br /><br />const float32 sin_tab[] =<br />{ // SINVAL Index Angle Sin(Ang) <br /> 0, // 0 0 0 <br /> 0.024541229, // 1 1.4063 0.024541 <br /> 0.049067674, // 2 2.8125 0.049068 <br /> 0.073564564, // 3 4.2188 0.073565 <br /> 0.09801714, // 4 5.625 0.098017 <br /> 0.12241068, // 5 7.0313 0.12241 <br /> 0.14673047, // 6 8.4375 0.14673 <br /> 0.17096189, // 7 9.8438 0.17096 <br /> 0.19509032, // 8 11.25 0.19509 <br /> 0.21910124, // 9 12.6562 0.2191 <br /> 0.24298018, // 10 14.0625 0.24298 <br /> 0.26671276, // 11 15.4687 0.26671 <br /> 0.29028468, // 12 16.875 0.29028 <br /> 0.31368174, // 13 18.2813 0.31368 <br /> 0.33688985, // 14 19.6875 0.33689 <br /> 0.35989504, // 15 21.0937 0.3599 <br /> 0.38268343, // 16 22.5 0.38268 <br /> 0.40524131, // 17 23.9063 0.40524 <br /> 0.42755509, // 18 25.3125 0.42756 <br /> 0.44961133, // 19 26.7187 0.44961 <br /> 0.47139674, // 20 28.125 0.4714 <br /> 0.49289819, // 21 29.5313 0.4929 <br /> 0.51410274, // 22 30.9375 0.5141 <br /> 0.53499762, // 23 32.3438 0.535 <br /> 0.55557023, // 24 33.75 0.55557 <br /> 0.57580819, // 25 35.1563 0.57581 <br /> 0.5956993, // 26 36.5625 0.5957 <br /> 0.61523159, // 27 37.9688 0.61523 <br /> 0.63439328, // 28 39.375 0.63439 <br /> 0.65317284, // 29 40.7813 0.65317 <br /> 0.67155895, // 30 42.1875 0.67156 <br /> 0.68954054, // 31 43.5938 0.68954 <br /> 0.70710678, // 32 45 0.70711 <br /> 0.72424708, // 33 46.4063 0.72425 <br /> 0.74095113, // 34 47.8125 0.74095 <br /> 0.75720885, // 35 49.2188 0.75721 <br /> 0.77301045, // 36 50.625 0.77301 <br /> 0.78834643, // 37 52.0313 0.78835 <br /> 0.80320753, // 38 53.4375 0.80321 <br /> 0.81758481, // 39 54.8437 0.81758 <br /> 0.83146961, // 40 56.25 0.83147 <br /> 0.84485357, // 41 57.6562 0.84485 <br /> 0.85772861, // 42 59.0625 0.85773 <br /> 0.87008699, // 43 60.4688 0.87009 <br /> 0.88192126, // 44 61.875 0.88192 <br /> 0.8932243, // 45 63.2813 0.89322 <br /> 0.90398929, // 46 64.6875 0.90399 <br /> 0.91420976, // 47 66.0938 0.91421 <br /> 0.92387953, // 48 67.5 0.92388 <br /> 0.9329928, // 49 68.9062 0.93299 <br /> 0.94154407, // 50 70.3125 0.94154 <br /> 0.94952818, // 51 71.7188 0.94953 <br /> 0.95694034, // 52 73.125 0.95694 <br /> 0.96377607, // 53 74.5313 0.96378 <br /> 0.97003125, // 54 75.9375 0.97003 <br /> 0.97570213, // 55 77.3438 0.9757 <br /> 0.98078528, // 56 78.75 0.98079 <br /> 0.98527764, // 57 80.1563 0.98528 <br /> 0.98917651, // 58 81.5625 0.98918 <br /> 0.99247953, // 59 82.9688 0.99248 <br /> 0.99518473, // 60 84.375 0.99518 <br /> 0.99729046, // 61 85.7812 0.99729 <br /> 0.99879546, // 62 87.1875 0.9988 <br /> 0.99969882, // 63 88.5938 0.9997 <br /> 1, // 64 90 1 <br /> 0.99969882, // 65 91.4062 0.9997 <br /> 0.99879546, // 66 92.8125 0.9988 <br /> 0.99729046, // 67 94.2188 0.99729 <br /> 0.99518473, // 68 95.625 0.99518 <br /> 0.99247953, // 69 97.0313 0.99248 <br /> 0.98917651, // 70 98.4375 0.98918 <br /> 0.98527764, // 71 99.8438 0.98528 <br /> 0.98078528, // 72 101.25 0.98079 <br /> 0.97570213, // 73 102.6563 0.9757 <br /> 0.97003125, // 74 104.0625 0.97003 <br /> 0.96377607, // 75 105.4688 0.96378 <br /> 0.95694034, // 76 106.875 0.95694 <br /> 0.94952818, // 77 108.2813 0.94953 <br /> 0.94154407, // 78 109.6875 0.94154 <br /> 0.9329928, // 79 111.0938 0.93299 <br /> 0.92387953, // 80 112.5 0.92388 <br /> 0.91420976, // 81 113.9063 0.91421 <br /> 0.90398929, // 82 115.3125 0.90399 <br /> 0.8932243, // 83 116.7188 0.89322 <br /> 0.88192126, // 84 118.125 0.88192 <br /> 0.87008699, // 85 119.5313 0.87009 <br /> 0.85772861, // 86 120.9375 0.85773 <br /> 0.84485357, // 87 122.3437 0.84485 <br /> 0.83146961, // 88 123.75 0.83147 <br /> 0.81758481, // 89 125.1563 0.81758 <br /> 0.80320753, // 90 126.5625 0.80321 <br /> 0.78834643, // 91 127.9688 0.78835 <br /> 0.77301045, // 92 129.375 0.77301 <br /> 0.75720885, // 93 130.7812 0.75721 <br /> 0.74095113, // 94 132.1875 0.74095 <br /> 0.72424708, // 95 133.5938 0.72425 <br /> 0.70710678, // 96 135 0.70711 <br /> 0.68954054, // 97 136.4063 0.68954 <br /> 0.67155895, // 98 137.8125 0.67156 <br /> 0.65317284, // 99 139.2188 0.65317 <br /> 0.63439328, // 100 140.625 0.63439 <br /> 0.61523159, // 101 142.0313 0.61523 <br /> 0.5956993, // 102 143.4375 0.5957 <br /> 0.57580819, // 103 144.8438 0.57581 <br /> 0.55557023, // 104 146.25 0.55557 <br /> 0.53499762, // 105 147.6563 0.535 <br /> 0.51410274, // 106 149.0625 0.5141 <br /> 0.49289819, // 107 150.4688 0.4929 <br /> 0.47139674, // 108 151.875 0.4714 <br /> 0.44961133, // 109 153.2812 0.44961 <br /> 0.42755509, // 110 154.6875 0.42756 <br /> 0.40524131, // 111 156.0938 0.40524 <br /> 0.38268343, // 112 157.5 0.38268 <br /> 0.35989504, // 113 158.9063 0.3599 <br /> 0.33688985, // 114 160.3125 0.33689 <br /> 0.31368174, // 115 161.7188 0.31368 <br /> 0.29028468, // 116 163.125 0.29028 <br /> 0.26671276, // 117 164.5313 0.26671 <br /> 0.24298018, // 118 165.9375 0.24298 <br /> 0.21910124, // 119 167.3438 0.2191 <br /> 0.19509032, // 120 168.75 0.19509 <br /> 0.17096189, // 121 170.1563 0.17096 <br /> 0.14673047, // 122 171.5625 0.14673 <br /> 0.12241068, // 123 172.9688 0.12241 <br /> 0.09801714, // 124 174.375 0.098017 <br /> 0.073564564, // 125 175.7812 0.073565 <br /> 0.049067674, // 126 177.1875 0.049068 <br /> 0.024541229, // 127 178.5938 0.024541 <br /> 0, // 128 180 1.2246e-016 <br /> -0.024541229, // 129 181.4063 -0.024541 <br /> -0.049067674, // 130 182.8125 -0.049068 <br /> -0.073564564, // 131 184.2188 -0.073565 <br /> -0.09801714, // 132 185.625 -0.098017 <br /> -0.12241068, // 133 187.0313 -0.12241 <br /> -0.14673047, // 134 188.4375 -0.14673 <br /> -0.17096189, // 135 189.8438 -0.17096 <br /> -0.19509032, // 136 191.25 -0.19509 <br /> -0.21910124, // 137 192.6563 -0.2191 <br /> -0.24298018, // 138 194.0625 -0.24298 <br /> -0.26671276, // 139 195.4687 -0.26671 <br /> -0.29028468, // 140 196.875 -0.29028 <br /> -0.31368174, // 141 198.2813 -0.31368 <br /> -0.33688985, // 142 199.6875 -0.33689 <br /> -0.35989504, // 143 201.0938 -0.3599 <br /> -0.38268343, // 144 202.5 -0.38268 <br /> -0.40524131, // 145 203.9063 -0.40524 <br /> -0.42755509, // 146 205.3125 -0.42756 <br /> -0.44961133, // 147 206.7188 -0.44961 <br /> -0.47139674, // 148 208.125 -0.4714 <br /> -0.49289819, // 149 209.5313 -0.4929 <br /> -0.51410274, // 150 210.9375 -0.5141 <br /> -0.53499762, // 151 212.3438 -0.535 <br /> -0.55557023, // 152 213.75 -0.55557 <br /> -0.57580819, // 153 215.1563 -0.57581 <br /> -0.5956993, // 154 216.5625 -0.5957 <br /> -0.61523159, // 155 217.9688 -0.61523 <br /> -0.63439328, // 156 219.375 -0.63439 <br /> -0.65317284, // 157 220.7813 -0.65317 <br /> -0.67155895, // 158 222.1875 -0.67156 <br /> -0.68954054, // 159 223.5938 -0.68954 <br /> -0.70710678, // 160 225 -0.70711 <br /> -0.72424708, // 161 226.4062 -0.72425 <br /> -0.74095113, // 162 227.8125 -0.74095 <br /> -0.75720885, // 163 229.2188 -0.75721 <br /> -0.77301045, // 164 230.625 -0.77301 <br /> -0.78834643, // 165 232.0312 -0.78835 <br /> -0.80320753, // 166 233.4375 -0.80321 <br /> -0.81758481, // 167 234.8437 -0.81758 <br /> -0.83146961, // 168 236.25 -0.83147 <br /> -0.84485357, // 169 237.6563 -0.84485 <br /> -0.85772861, // 170 239.0625 -0.85773 <br /> -0.87008699, // 171 240.4688 -0.87009 <br /> -0.88192126, // 172 241.875 -0.88192 <br /> -0.8932243, // 173 243.2812 -0.89322 <br /> -0.90398929, // 174 244.6875 -0.90399 <br /> -0.91420976, // 175 246.0938 -0.91421 <br /> -0.92387953, // 176 247.5 -0.92388 <br /> -0.9329928, // 177 248.9063 -0.93299 <br /> -0.94154407, // 178 250.3125 -0.94154 <br /> -0.94952818, // 179 251.7188 -0.94953 <br /> -0.95694034, // 180 253.125 -0.95694 <br /> -0.96377607, // 181 254.5313 -0.96378 <br /> -0.97003125, // 182 255.9375 -0.97003 <br /> -0.97570213, // 183 257.3438 -0.9757 <br /> -0.98078528, // 184 258.75 -0.98079 <br /> -0.98527764, // 185 260.1563 -0.98528 <br /> -0.98917651, // 186 261.5625 -0.98918 <br /> -0.99247953, // 187 262.9688 -0.99248 <br /> -0.99518473, // 188 264.375 -0.99518 <br /> -0.99729046, // 189 265.7813 -0.99729 <br /> -0.99879546, // 190 267.1875 -0.9988 <br /> -0.99969882, // 191 268.5938 -0.9997 <br /> -1, // 192 270 -1 <br /> -0.99969882, // 193 271.4063 -0.9997 <br /> -0.99879546, // 194 272.8125 -0.9988 <br /> -0.99729046, // 195 274.2188 -0.99729 <br /> -0.99518473, // 196 275.625 -0.99518 <br /> -0.99247953, // 197 277.0313 -0.99248 <br /> -0.98917651, // 198 278.4375 -0.98918 <br /> -0.98527764, // 199 279.8438 -0.98528 <br /> -0.98078528, // 200 281.25 -0.98079 <br /> -0.97570213, // 201 282.6563 -0.9757 <br /> -0.97003125, // 202 284.0625 -0.97003 <br /> -0.96377607, // 203 285.4688 -0.96378 <br /> -0.95694034, // 204 286.875 -0.95694 <br /> -0.94952818, // 205 288.2813 -0.94953 <br /> -0.94154407, // 206 289.6875 -0.94154 <br /> -0.9329928, // 207 291.0938 -0.93299 <br /> -0.92387953, // 208 292.5 -0.92388 <br /> -0.91420976, // 209 293.9062 -0.91421 <br /> -0.90398929, // 210 295.3125 -0.90399 <br /> -0.8932243, // 211 296.7188 -0.89322 <br /> -0.88192126, // 212 298.125 -0.88192 <br /> -0.87008699, // 213 299.5313 -0.87009 <br /> -0.85772861, // 214 300.9375 -0.85773 <br /> -0.84485357, // 215 302.3438 -0.84485 <br /> -0.83146961, // 216 303.75 -0.83147 <br /> -0.81758481, // 217 305.1563 -0.81758 <br /> -0.80320753, // 218 306.5625 -0.80321 <br /> -0.78834643, // 219 307.9688 -0.78835 <br /> -0.77301045, // 220 309.375 -0.77301 <br /> -0.75720885, // 221 310.7813 -0.75721 <br /> -0.74095113, // 222 312.1875 -0.74095 <br /> -0.72424708, // 223 313.5938 -0.72425 <br /> -0.70710678, // 224 315 -0.70711 <br /> -0.68954054, // 225 316.4063 -0.68954 <br /> -0.67155895, // 226 317.8125 -0.67156 <br /> -0.65317284, // 227 319.2188 -0.65317 <br /> -0.63439328, // 228 320.625 -0.63439 <br /> -0.61523159, // 229 322.0313 -0.61523 <br /> -0.5956993, // 230 323.4375 -0.5957 <br /> -0.57580819, // 231 324.8438 -0.57581 <br /> -0.55557023, // 232 326.25 -0.55557 <br /> -0.53499762, // 233 327.6563 -0.535 <br /> -0.51410274, // 234 329.0625 -0.5141 <br /> -0.49289819, // 235 330.4688 -0.4929 <br /> -0.47139674, // 236 331.875 -0.4714 <br /> -0.44961133, // 237 333.2812 -0.44961 <br /> -0.42755509, // 238 334.6875 -0.42756 <br /> -0.40524131, // 239 336.0938 -0.40524 <br /> -0.38268343, // 240 337.5 -0.38268 <br /> -0.35989504, // 241 338.9063 -0.3599 <br /> -0.33688985, // 242 340.3125 -0.33689 <br /> -0.31368174, // 243 341.7188 -0.31368 <br /> -0.29028468, // 244 343.125 -0.29028 <br /> -0.26671276, // 245 344.5313 -0.26671 <br /> -0.24298018, // 246 345.9375 -0.24298 <br /> -0.21910124, // 247 347.3437 -0.2191 <br /> -0.19509032, // 248 348.75 -0.19509 <br /> -0.17096189, // 249 350.1563 -0.17096 <br /> -0.14673047, // 250 351.5625 -0.14673 <br /> -0.12241068, // 251 352.9688 -0.12241 <br /> -0.09801714, // 252 354.375 -0.098017 <br /> -0.073564564, // 253 355.7813 -0.073565 <br /> -0.049067674, // 254 357.1875 -0.049068 <br /> -0.024541229, // 255 358.5938 -0.024541 <br /> 0 // 256 360 -2.4493e-016 <br /><br />};<br />/*=====================================================================================<br /> File name: IPARK.C <br /> <br /> Originator: Digital Control Systems Group<br /> Texas Instruments<br /><br /> Description: Inverse Park Transformation <br /><br />=====================================================================================<br /> History:<br />-------------------------------------------------------------------------------------<br /> 04-15-2005 Version 3.20<br />-------------------------------------------------------------------------------------*/<br /><br />#include "dmctype.h"<br />#include "ipark.h"<br /><br />extern float32 sin_tab[];<br /><br />void ipark_calc(IPARK *v)<br />{ <br /> <br /> float32 Cosine,Sine;<br /> <br />// Using look-up sine table <br />// (PI/2)/(2*PI) = 0.25<br />// ((PI/2)/(2*PI))*256 = 0.25*256 = 64<br />// ((PI/2)-2*PI)/(2*PI) = -0.75<br />// (((PI/2)-2*PI)/(2*PI))*256 = -0.75*256 = -192<br /><br /> if (v->Angle+0.25 > 1.0) <br /> {<br /> Sine = sin_tab[(int16)(v->Angle*256)];<br /> Cosine = sin_tab[(int16)(v->Angle*256) - 192]; <br /> }<br /> else<br /> { <br /> Sine = sin_tab[(int16)(v->Angle*256)];<br /> Cosine = sin_tab[(int16)(v->Angle*256) + 64];<br /> }<br /> <br /> v->Alpha = v->Ds*Cosine - v->Qs*Sine;<br /> v->Beta = v->Qs*Cosine + v->Ds*Sine; <br />}<br /><br /><br /><br />请高手指点下！！！<br /> <br />
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