51 lines
2.1 KiB
C
51 lines
2.1 KiB
C
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/* -*- mode: c; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4; coding: utf-8 -*- */
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/************************************************************************************
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** **
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** UHSDR **
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** a powerful firmware for STM32 based SDR transceivers **
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** **
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**---------------------------------------------------------------------------------**
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** **
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** File name: **
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** Description: **
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** Last Modified: **
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** Licence: GNU GPLv3 **
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************************************************************************************/
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//
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// SI570 frequency shift table
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// 0-100 degrees C range
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// shots from 20m band (56Mhz)
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//
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// This frequency compensation table referenced to 14.000 MHz by KA7OEI, 10/14 using
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// a GPS reference in a temperature-controlled environment, extrapolated below 17C and above
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// 70C.
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//
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// Temperature normalized to 43C, a temperature achieved very soon after power-up
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// with both the Si570 and the temperature sensor thermally bonded.
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//
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// Note: The exact frequency/temperature dependencies will likely vary from unit to unit
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// for each Si570, but the values below appear to approximately follow typical AT-cut
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// temperature-frequency curves.
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//
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#include "uhsdr_types.h"
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// LO temperature compensation
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typedef struct LoTcxo
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{
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// Current compensation value
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// loaded to LO
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int32_t comp;
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int32_t temp;
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bool sensor_present;
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} LoTcxo;
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// ------------------------------------------------
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// LO Tcxo
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extern LoTcxo lo;
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bool SoftTcxo_HandleLoTemperatureDrift(void);
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void SoftTcxo_Init(void);
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