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https://github.com/eddyem/stm32samples.git
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add NTC temperature calculation
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eddyem
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1e56a58dc8
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7a470da982
@ -18,57 +18,100 @@
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#include "adc.h"
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extern volatile uint32_t Tms; // time counter for 1-second Vdd measurement
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static uint32_t lastVddtime = 0; // Tms value of last Vdd measurement
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static uint32_t VddValue = 0; // value of Vdd * 100 (for more precision measurements)
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// check time of last Vdd measurement & refresh it value
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#define CHKVDDTIME() do{if(!VddValue || Tms < lastVddtime || Tms - lastVddtime > 999) getVdd();}while(0)
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/**
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* @brief ADC_array - array for ADC channels:
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* @brief ADC_array - array for ADC channels with median filtering:
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* 0..3 - external NTC
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* 4 - internal Tsens
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* 5 - Vref
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*/
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uint16_t ADC_array[NUMBER_OF_ADC_CHANNELS];
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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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temperature = (int32_t) *TEMP30_CAL_ADDR - temperature;
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// int32_t temperature = (int32_t)ADC_array[4] * VddValue / 330;
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int32_t ADval = getADCval(4);
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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 = temperature / (int32_t)(*TEMP30_CAL_ADDR - *TEMP110_CAL_ADDR);
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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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/* #define ARRSZ (10)
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static uint16_t arr[ARRSZ] = {0};
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static int arridx = 0;
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uint32_t v = ADC_array[5];
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int i;
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if(arr[0] == 0){ // first run - fill all with current data
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for(i = 0; i < ARRSZ; ++i) arr[i] = (uint16_t) v;
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}else{
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arr[arridx++] = v;
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v = 0; // now v is mean
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if(arridx > ARRSZ-1) arridx = 0;
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// calculate mean
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for(i = 0; i < ARRSZ; ++i){
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v += arr[i];
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}
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v /= ARRSZ;
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}*/
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uint32_t vdd = ((uint32_t) *VREFINT_CAL_ADDR) * (uint32_t)330; // 3.3V
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//vdd /= v;
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vdd /= ADC_array[5];
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lastVddtime = Tms;
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VddValue = vdd;
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vdd /= getADCval(5);
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return vdd;
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}
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/**
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* @brief getNTC - return temperature of NTC (*10 degrC)
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* @param nch - NTC channel number (0..3)
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* @return
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*/
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int16_t getNTC(int nch){
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#define NKNOTS (9)
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const int16_t ADU[NKNOTS] = {427, 468, 514, 623, 754, 910, 1087, 1295, 1538};
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const int16_t T[NKNOTS] = {-200, -180, -159, -116, -72, -26, 23, 75, 132};
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/*
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* coefficients: 0.050477 0.045107 0.039150 0.033639 0.029785 0.027017 0.024996 0.023522 0.022514
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* use
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* [N D] = rat(K*10); printf("%d, ", N); printf("%d, ", D);
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*/
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const int16_t N[NKNOTS] = {1377, 295, 258, 110, 291, 77, 1657, 191, 120};
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const int16_t D[NKNOTS] = {2728, 654, 659, 327, 977, 285, 6629, 812, 533};
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if(nch < 0 || nch > 3) return -30000;
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uint16_t val = getADCval(nch);
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// find interval
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int idx = (NKNOTS+1)/2; // middle
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while(idx > 0 && idx < NKNOTS){
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int16_t left = ADU[idx];
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int half = idx / 2;
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if(val < left){
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if(idx == 0) break;
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if(val > ADU[idx-1]){ // found
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--idx;
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break;
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}
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idx = half;
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}else{
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if(idx == NKNOTS - 1) break; // more than max value
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if(val < ADU[idx+1]) break; // found
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idx += half;
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}
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}
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if(idx < 0) idx = 0;
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else if(idx > NKNOTS-1) idx = NKNOTS - 1;
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// T = Y0(idx) + K(idx) * (ADU - X0(idx));
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int16_t valT = T[idx] + (N[idx]*(val - ADU[idx]))/D[idx];
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#undef NKNOTS
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return valT;
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}
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@ -24,5 +24,7 @@
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extern uint16_t ADC_array[];
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int32_t getMCUtemp();
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uint32_t getVdd();
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uint16_t getADCval(int nch);
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int16_t getNTC(int nch);
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#endif // ADC_H
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Binary file not shown.
@ -91,7 +91,7 @@ static inline void adc_setup(){
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ADC1->CFGR1 |= ADC_CFGR1_DMAEN | ADC_CFGR1_DMACFG; /* (2) */
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DMA1_Channel1->CPAR = (uint32_t) (&(ADC1->DR)); /* (3) */
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DMA1_Channel1->CMAR = (uint32_t)(ADC_array); /* (4) */
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DMA1_Channel1->CNDTR = NUMBER_OF_ADC_CHANNELS; /* (5) */
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DMA1_Channel1->CNDTR = NUMBER_OF_ADC_CHANNELS * 9; /* (5) */
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DMA1_Channel1->CCR |= DMA_CCR_MINC | DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_0 | DMA_CCR_CIRC; /* (6) */
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DMA1_Channel1->CCR |= DMA_CCR_EN; /* (7) */
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ADC1->CR |= ADC_CR_ADSTART; /* start the ADC conversions */
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@ -39,7 +39,14 @@ static void debugging_proc(const char *command){
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return;
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}
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put_string("ADC value: ");
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put_uint(ADC_array[i]);
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put_uint(getADCval(i));
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usart1_sendbuf();
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break;
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case 'T': // all raw T values
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for(i = 0; i < 4; ++i){
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put_uint(getADCval(i));
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put_char('\t');
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}
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usart1_sendbuf();
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break;
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default:
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@ -48,6 +55,22 @@ static void debugging_proc(const char *command){
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}
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#endif
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/**
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* @brief get_ntc - show value of ith NTC temperature
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* @param str (i) - user string, first char should be '0'..'3'
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*/
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static void get_ntc(const char *str){
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uint8_t N = *str - '0';
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if(N > 3) return;
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int16_t NTC = getNTC(N);
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put_string("NTC");
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put_char(*str);
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put_char('=');
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put_int(NTC);
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}
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#define SEND(x) usart1_send_blocking(x, 0)
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/**
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* @brief process_command - command parser
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* @param command - command text (all inside [] without spaces)
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@ -58,16 +81,20 @@ char *process_command(const char *command){
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char *ret = NULL;
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usart1_sendbuf(); // send buffer (if it is already filled)
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switch(*ptr++){
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case '?': // help
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put_string("R - reset\nt - get MCU temp\nV - get Vdd\n");
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case '?': // help
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SEND("R - reset\nTx - get NTC temp\nt - get MCU temp\nV - get Vdd");
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#ifdef EBUG
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put_string("d -> goto debug:\n");
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put_string("\tw - test watchdog\n\tAx - get raw ADCx value\n");
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SEND("d -> goto debug:");
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SEND("\tw - test watchdog\n\tAx - get raw ADCx value");
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SEND("\tT - show raw T values");
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#endif
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break;
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break;
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case 'R': // reset MCU
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NVIC_SystemReset();
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break;
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case 'T': // get temperature of NTC(x)
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get_ntc(ptr);
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break;
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case 't': // get mcu T
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put_string("MCUTEMP10=");
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put_int(getMCUtemp());
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@ -50,7 +50,7 @@ int put_string(const char *str){
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while(trbufidx < UARTBUFSZ - 1 && *str){
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trbuf[trbufidx++] = *str++;
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}
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error! shouldn't be!!!
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//error! shouldn't be!!!
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if(*str) return 1; // buffer overfull
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trbuf[trbufidx] = 0;
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return 0; // all OK
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