How to filter my ADC output ?

2 vues (au cours des 30 derniers jours)
bianchi
bianchi le 2 Sep 2019
Modifié(e) : bianchi le 2 Sep 2019
Dear Members,
I got a filter coefficient from matlab :
/* General type conversion for MATLAB generated C-code */
#include "tmwtypes.h"
/*
* Expected path to tmwtypes.h
* C:\Program Files\MATLAB\R2018b\extern\include\tmwtypes.h
*/
const int BL = 252;
const real64_T B[252] = {
6.509489485376e-06,8.270468373576e-06,7.064827126383e-06,2.035036566381e-06,
-6.199144943968e-06,-1.530430577156e-05,-2.170369436731e-05,-2.174427733836e-05,
-1.324304616624e-05,3.149084058685e-06,2.339035331051e-05,4.073809420116e-05,
4.771598033019e-05, 3.88749823869e-05,1.343292994109e-05,-2.328007613973e-05,
-6.040768693408e-05,-8.440733005252e-05,-8.353908676759e-05,-5.263877917656e-05,
3.573508475597e-06,7.018851252303e-05,0.0001255118884919, 0.000147627918814,
0.0001222953867957,4.952226525078e-05,-5.382154786297e-05,-0.0001570052393388,
-0.0002239403811517,-0.0002250586264019,-0.000148863525125,-8.971673748049e-06,
0.0001565921278752,0.0002948202746476,0.0003538868289885,0.0003013760703547,
0.0001384716510019,-9.546804025625e-05,-0.0003309454428265,-0.0004879684402625,
-0.0005020986841372,-0.000348744552471,-5.704216636268e-05,0.0002928736706498,
0.0005904665632932,0.0007285044131239,0.0006399792716264, 0.000325987210871,
-0.0001361070302262,-0.0006094448304161, -0.00093670421378,-0.0009907704066022,
-0.0007211998800203,-0.0001802110032807,0.0004829797264755, 0.001061180750259,
0.001352190579092, 0.001227129264082,0.0006816976957453,-0.0001487550665314,
-0.0010193333099,-0.001645588235867,-0.001794153121802,-0.001365824774668,
-0.0004425130028242,0.0007213421897964, 0.001765671644857, 0.002333570437864,
0.002189935617387, 0.001311451978109,-8.479801395671e-05,-0.001589583874628,
-0.002718070358089,-0.003062598285136,-0.002434585940507,-0.0009475929608268,
0.0009914380896389, 0.002788470577278, 0.00384022894245, 0.00373166167708,
0.002389832564894,0.0001396368407159,-0.002365947536661,-0.004329634042112,
-0.005057755292929,-0.004196967869377,-0.001881265667525, 0.001266880368926,
0.004294843744221, 0.006200435613341, 0.006254439807294, 0.00426393327023,
0.0006854015379761,-0.003462805399825, -0.00687871151427,-0.008373150891941,
-0.007267200985151,-0.003662419169445, 0.001515171799773, 0.006732980928894,
0.01028679430541, 0.01083449837216, 0.007867746323399, 0.001965125316513,
-0.005275587183862, -0.01163742062178, -0.01492483266663, -0.01366929215605,
-0.007686544451677, 0.001703476697994, 0.01189919209156, 0.01966422424027,
0.02205153049026, 0.01736115274647, 0.005854450632269, -0.01000807742441,
-0.0259235455839, -0.03665900395193, -0.03732268145457, -0.02468377261547,
0.001805107035604, 0.03957199855514, 0.08322774168024, 0.1255731326557,
0.159094765642, 0.1776005452962, 0.1776005452962, 0.159094765642,
0.1255731326557, 0.08322774168024, 0.03957199855514, 0.001805107035604,
-0.02468377261547, -0.03732268145457, -0.03665900395193, -0.0259235455839,
-0.01000807742441, 0.005854450632269, 0.01736115274647, 0.02205153049026,
0.01966422424027, 0.01189919209156, 0.001703476697994,-0.007686544451677,
-0.01366929215605, -0.01492483266663, -0.01163742062178,-0.005275587183862,
0.001965125316513, 0.007867746323399, 0.01083449837216, 0.01028679430541,
0.006732980928894, 0.001515171799773,-0.003662419169445,-0.007267200985151,
-0.008373150891941, -0.00687871151427,-0.003462805399825,0.0006854015379761,
0.00426393327023, 0.006254439807294, 0.006200435613341, 0.004294843744221,
0.001266880368926,-0.001881265667525,-0.004196967869377,-0.005057755292929,
-0.004329634042112,-0.002365947536661,0.0001396368407159, 0.002389832564894,
0.00373166167708, 0.00384022894245, 0.002788470577278,0.0009914380896389,
-0.0009475929608268,-0.002434585940507,-0.003062598285136,-0.002718070358089,
-0.001589583874628,-8.479801395671e-05, 0.001311451978109, 0.002189935617387,
0.002333570437864, 0.001765671644857,0.0007213421897964,-0.0004425130028242,
-0.001365824774668,-0.001794153121802,-0.001645588235867, -0.0010193333099,
-0.0001487550665314,0.0006816976957453, 0.001227129264082, 0.001352190579092,
0.001061180750259,0.0004829797264755,-0.0001802110032807,-0.0007211998800203,
-0.0009907704066022, -0.00093670421378,-0.0006094448304161,-0.0001361070302262,
0.000325987210871,0.0006399792716264,0.0007285044131239,0.0005904665632932,
0.0002928736706498,-5.704216636268e-05,-0.000348744552471,-0.0005020986841372,
-0.0004879684402625,-0.0003309454428265,-9.546804025625e-05,0.0001384716510019,
0.0003013760703547,0.0003538868289885,0.0002948202746476,0.0001565921278752,
-8.971673748049e-06,-0.000148863525125,-0.0002250586264019,-0.0002239403811517,
-0.0001570052393388,-5.382154786297e-05,4.952226525078e-05,0.0001222953867957,
0.000147627918814,0.0001255118884919,7.018851252303e-05,3.573508475597e-06,
-5.263877917656e-05,-8.353908676759e-05,-8.440733005252e-05,-6.040768693408e-05,
-2.328007613973e-05,1.343292994109e-05, 3.88749823869e-05,4.771598033019e-05,
4.073809420116e-05,2.339035331051e-05,3.149084058685e-06,-1.324304616624e-05,
-2.174427733836e-05,-2.170369436731e-05,-1.530430577156e-05,-6.199144943968e-06,
2.035036566381e-06,7.064827126383e-06,8.270468373576e-06,6.509489485376e-06
};
I use STM32
HAL_ADC_Start_DMA (&hadc, (uint32_t *) adc_buf, 4); // data to be converted = 4
HAL_Delay(10);
printf("ADC value 3 %u \r\n",adc_val[3]);
.
.
.
I want to filter adc_val[3] ...
How can I attach it to my ADC result ? and then print the result out to compare ?
Thanks

Réponses (1)

bianchi
bianchi le 2 Sep 2019
Modifié(e) : bianchi le 2 Sep 2019
Is it possible that I do :
for(int i=0;i<BL;i++)
{
y =y + x[i]*B[BL-i];
}
for(int i=0;i<BL-1;i++)
{
x[i] = x[i+1];
}
x[251]=Vdd[3];
printf("Filtered value %u",(int)y);

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