FreeCalypso > hg > freecalypso-tools
comparison rfcal/vcxo-manual/genparams.c @ 184:b8599a1d5813
fc-vcxo-param: bug in lin_b2 computation
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 13 Apr 2017 04:58:58 +0000 |
parents | 9099a35a705f |
children | 3eb53be9e667 |
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183:0518ed1d0dc8 | 184:b8599a1d5813 |
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58 lin_b = (float)meas[1].freq_offset - lin_a * meas[1].dac_value; | 58 lin_b = (float)meas[1].freq_offset - lin_a * meas[1].dac_value; |
59 | 59 |
60 /* second linear approximation */ | 60 /* second linear approximation */ |
61 lin_a2 = (float)(meas[3].freq_offset - meas[2].freq_offset) / | 61 lin_a2 = (float)(meas[3].freq_offset - meas[2].freq_offset) / |
62 (float)(meas[3].dac_value - meas[2].dac_value); | 62 (float)(meas[3].dac_value - meas[2].dac_value); |
63 lin_b2 = (float)meas[3].freq_offset - lin_a * meas[2].dac_value; | 63 lin_b2 = (float)meas[3].freq_offset - lin_a2 * meas[3].dac_value; |
64 | 64 |
65 /* DAC settings */ | 65 /* DAC settings */ |
66 dac_min = (-13500.0f - lin_b) / lin_a; | 66 dac_min = (-13500.0f - lin_b) / lin_a; |
67 dac_max = (13500.0f - lin_b) / lin_a; | 67 dac_max = (13500.0f - lin_b) / lin_a; |
68 dac_init = -lin_b2 / lin_a2; | 68 dac_init = -lin_b2 / lin_a2; |