mirror of
https://github.com/eddyem/stm32samples.git
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71 lines
2.4 KiB
C
71 lines
2.4 KiB
C
/*
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* This file is part of the Chiller project.
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* Copyright 2018 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "adc.h"
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/**
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* @brief ADC_array - array for ADC channels with median filtering:
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* 0 - Rvar
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* 1 - internal Tsens
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* 2 - Vref
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*/
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uint16_t ADC_array[NUMBER_OF_ADC_CHANNELS*9];
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/**
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* @brief getADCval - calculate median value for `nch` channel
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* @param nch - number of channel
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* @return
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*/
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uint16_t getADCval(int nch){
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int i, addr = nch;
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register uint16_t temp;
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#define PIX_SORT(a,b) { if ((a)>(b)) PIX_SWAP((a),(b)); }
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#define PIX_SWAP(a,b) { temp=(a);(a)=(b);(b)=temp; }
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uint16_t p[9];
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for(i = 0; i < 9; ++i, addr += NUMBER_OF_ADC_CHANNELS) // first we should prepare array for optmed
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p[i] = ADC_array[addr];
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PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
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PIX_SORT(p[0], p[1]) ; PIX_SORT(p[3], p[4]) ; PIX_SORT(p[6], p[7]) ;
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PIX_SORT(p[1], p[2]) ; PIX_SORT(p[4], p[5]) ; PIX_SORT(p[7], p[8]) ;
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PIX_SORT(p[0], p[3]) ; PIX_SORT(p[5], p[8]) ; PIX_SORT(p[4], p[7]) ;
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PIX_SORT(p[3], p[6]) ; PIX_SORT(p[1], p[4]) ; PIX_SORT(p[2], p[5]) ;
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PIX_SORT(p[4], p[7]) ; PIX_SORT(p[4], p[2]) ; PIX_SORT(p[6], p[4]) ;
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PIX_SORT(p[4], p[2]) ;
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return p[4];
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#undef PIX_SORT
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#undef PIX_SWAP
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}
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// return MCU temperature (degrees of celsius * 10)
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int32_t getMCUtemp(){
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// Temp = (V25 - Vsense)/Avg_Slope + 25
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// V_25 = 1.45V, Slope = 4.3e-3
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int32_t Vsense = getVdd() * getADCval(1);
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int32_t temperature = 593920 - Vsense; // 593920 == 145*4096
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temperature /= 172; // == /(4096*10*4.3e-3), 10 - to convert from *100 to *10
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temperature += 250;
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return(temperature);
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}
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// return Vdd * 100 (V)
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uint32_t getVdd(){
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uint32_t vdd = 120 * 4096; // 1.2V
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vdd /= getADCval(2);
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return vdd;
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}
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