mirror of
https://github.com/eddyem/stm32samples.git
synced 2026-05-09 14:26:53 +03:00
change proto to text strings; add simplest NTC measurement
This commit is contained in:
Edward Emelianov
@@ -16,17 +16,26 @@
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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 <math.h>
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#ifdef EBUG
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#include "strfunc.h"
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#endif
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#include "adc.h"
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/**
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* @brief ADCx_array - arrays for ADC channels with median filtering:
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* ADC1:
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* 0 - Ch0 - ADC1_IN1
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* 1 - Ch1 - ADC1_IN2
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* 2 - internal Tsens - ADC1_IN16
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* 3 - Vref - ADC1_IN18
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* 0 - Ch0 - ADC1_IN1 - NTC1
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* 1 - Ch1 - ADC1_IN2 - NTC2
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* 2 - Ch2 - ADC1_IN3 - NTC3
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* 3 - Ch3 - ADC1_IN4 - NTC4
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* 4 - internal Tsens - ADC1_IN16
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* 5 - Vref - ADC1_IN18
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* ADC2:
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* 4 - AIN5/DAC_OUT1 - PA4 - DAC1_OUT1 (onboard heater?), PA5 - ADC2_IN2 (DAC output control)
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* AIN5/DAC_OUT1 - PA4 - DAC1_OUT1 (onboard heater)
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* 6 - PA5 - ADC2_IN2 (DAC output control)
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*/
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static uint16_t ADC_array[NUMBER_OF_ADC_CHANNELS*9];
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@@ -65,17 +74,19 @@ TRUE_INLINE void enADC(ADC_TypeDef *chnl){
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* ADC1 - DMA1_ch1
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* ADC2 - DMA2_ch1
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*/
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// Setup ADC and DAC
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// Setup ADC and DAC; ADC/DAC pins should be prepared in gpio_setup
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void adc_setup(){
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RCC->AHBENR |= RCC_AHBENR_ADC12EN; // Enable clocking
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ADC12_COMMON->CCR = ADC_CCR_TSEN | ADC_CCR_VREFEN | ADC_CCR_CKMODE; // enable Tsens and Vref, HCLK/4
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calADC(ADC1);
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calADC(ADC2);
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// ADC1: channels 1,2,16,18; ADC2: channel 2
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ADC1->SMPR1 = ADC_SMPR1_SMP0 | ADC_SMPR1_SMP1;
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// ADC1: channels 1,2,3,4,16,18
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ADC1->SMPR1 = ADC_SMPR1_SMP0 | ADC_SMPR1_SMP1 | ADC_SMPR1_SMP2 | ADC_SMPR1_SMP3;
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ADC1->SMPR2 = ADC_SMPR2_SMP15 | ADC_SMPR2_SMP17;
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// 4 conversions in group: 1->2->16->18
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ADC1->SQR1 = (1<<6) | (2<<12) | (16<<18) | (18<<24) | (NUMBER_OF_ADC1_CHANNELS-1);
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// 6 conversions in group: 1->2->3->4->16->18
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ADC1->SQR1 = (1<<6) | (2<<12) | (3<<18) | (4<<24) | (NUMBER_OF_ADC1_CHANNELS-1);
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ADC1->SQR2 = (16<<0) | (18<<6);
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// ADC2: channel 2
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ADC2->SMPR1 = ADC_SMPR1_SMP1;
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ADC2->SQR1 = (2<<6) | (NUMBER_OF_ADC2_CHANNELS-1);
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// configure DMA for ADC
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@@ -109,7 +120,8 @@ void adc_setup(){
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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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uint16_t getADCval(uint8_t nch){
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if(nch >= NUMBER_OF_ADC_CHANNELS) return 0;
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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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@@ -131,7 +143,7 @@ uint16_t getADCval(int nch){
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}
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// get voltage @input nch (V)
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float getADCvoltage(int nch){
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float getADCvoltage(uint8_t nch){
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float v = getADCval(nch);
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v *= getVdd();
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v /= 4096.f; // 12bit ADC
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@@ -155,3 +167,114 @@ float getVdd(){
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vdd /= getADCval(ADC_VREF);
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return vdd;
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}
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// R lookup table for T=-10..59 degreesC
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#if 0
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T=[-10:59]+273.15;
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R=1000*exp(3950*(1./T-1/298.15));
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for i=1:length(T); printf("\t%.1f,\t// %d \n", R(i), T(i)-273.15); endfor
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#endif
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static const float Rlut[] = {
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5824.6, // -10
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5502.8, // -9
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5201.1, // -8
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4917.9, // -7
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4652.2, // -6
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4402.6, // -5
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4168.1, // -4
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3947.7, // -3
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3740.5, // -2
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3545.5, // -1
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3362.1, // 0
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3189.3, // 1
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3026.6, // 2
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2873.3, // 3
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2728.8, // 4
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2592.5, // 5
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2463.9, // 6
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2342.5, // 7
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2227.9, // 8
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2119.7, // 9
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2017.5, // 10
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1920.8, // 11
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1829.4, // 12
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1743.0, // 13
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1661.2, // 14
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1583.7, // 15
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1510.4, // 16
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1440.9, // 17
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1375.1, // 18
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1312.7, // 19
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1253.5, // 20
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1197.4, // 21
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1144.1, // 22
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1093.6, // 23
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1045.6, // 24
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1000.0, // 25
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956.7, // 26
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915.5, // 27
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876.4, // 28
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839.1, // 29
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803.7, // 30
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770.0, // 31
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737.9, // 32
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707.4, // 33
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678.3, // 34
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650.6, // 35
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624.1, // 36
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598.9, // 37
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574.9, // 38
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552.0, // 39
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530.1, // 40
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509.3, // 41
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489.4, // 42
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470.3, // 43
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452.2, // 44
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434.8, // 45
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418.2, // 46
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402.4, // 47
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387.2, // 48
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372.7, // 49
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358.8, // 50
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345.5, // 51
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332.8, // 52
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320.7, // 53
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309.0, // 54
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297.8, // 55
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287.1, // 56
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276.9, // 57
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267.1, // 58
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257.7, // 59
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};
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#define LUTSZ (sizeof(Rlut) / sizeof(float))
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/**
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* @brief getNTCtemp - stupid LUT-search and linear approximation of T by R
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* @param nch - channel of ADC for Tx
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* @return temperature in degr.C
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*/
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float getNTCtemp(uint8_t nch){
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if(nch > ADC_AIN4) return -300.f; // bad number
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uint16_t val = getADCval(nch);
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if(val < 5) return -400.f; // short cirquit
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else if(val > 4090) return -500.f; // no NTC
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float R = 1000.f / (4096.f / val - 1.f); // resistance of NTC
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#ifdef EBUG
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USB_sendstr("R="); USB_sendstr(float2str(R, 1)); newline();
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#endif
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int left = 0, right = LUTSZ-1;
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if(R > Rlut[0]) right = 1;
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else if(R < Rlut[LUTSZ-1]) left = LUTSZ-2;
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while(right - left > 1){
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int idx = left + (right - left) / 2;
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float Rl = Rlut[idx];
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if(Rl > R) left = idx + 1;
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else right = idx - 1;
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}
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if(left >= (int)LUTSZ) return 60.f;
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float Rleft = Rlut[left], Rright = Rlut[left+1];
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float T = (float)left - 9.f - (R - Rright) / (Rleft - Rright);
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return T;
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}
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