mirror of
https://github.com/eddyem/stm32samples.git
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75 lines
2.6 KiB
C
75 lines
2.6 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..3 - external channels
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* 4 - internal Tsens
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* 5 - Vref
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*/
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#define TSENS_CHAN (4)
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#define VREF_CHAN (5)
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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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getVdd();
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// make correction on Vdd value
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// int32_t temperature = (int32_t)ADC_array[4] * VddValue / 330;
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int32_t ADval = getADCval(TSENS_CHAN);
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int32_t temperature = (int32_t) *TEMP30_CAL_ADDR - ADval;
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temperature *= (int32_t)(1100 - 300);
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temperature /= (int32_t)(*TEMP30_CAL_ADDR - *TEMP110_CAL_ADDR);
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temperature += 300;
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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 = ((uint32_t) *VREFINT_CAL_ADDR) * (uint32_t)330; // 3.3V
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vdd /= getADCval(VREF_CHAN);
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return vdd;
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}
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