Team S - EDP 2 / Mbed 2 deprecated signal_processing

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Dependencies:   mbed

main.cpp@2:29c3d03c9231, 2018-02-14 (annotated)

Committer:
2236693B
Date:
Wed Feb 14 11:08:48 2018 +0000
Revision:
2:29c3d03c9231
Parent:
1:d1e89afbe50c
Child:
3:c9f4c9c84e36
First update;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
2236693B 1:d1e89afbe50c 1 //Rango says, hey there Conor!
2236693B 0:005922ecb765 2
2236693B 0:005922ecb765 3 #include "mbed.h"
2236693B 0:005922ecb765 4
2236693B 0:005922ecb765 5 DigitalOut myled(LED1);
2236693B 0:005922ecb765 6 AnalogIn Ain(PTB1);
2236693B 0:005922ecb765 7
2236693B 2:29c3d03c9231 8 int const MAX_B = 10;
2236693B 0:005922ecb765 9 int const delta = 0.5;
2236693B 2:29c3d03c9231 10 int const AVG_LEN = 160;
2236693B 2:29c3d03c9231 11
2236693B 2:29c3d03c9231 12 int sample_buffer[2*MAX_B] = {};
2236693B 2:29c3d03c9231 13 int local_buffer[2*MAX_B] = {};
2236693B 2:29c3d03c9231 14 int avg_buffer[AVG_LEN] = {};
2236693B 0:005922ecb765 15 int read = 0;
2236693B 0:005922ecb765 16 int write = 0;
2236693B 0:005922ecb765 17
2236693B 2:29c3d03c9231 18 int avg_write = 0;
2236693B 2:29c3d03c9231 19
2236693B 2:29c3d03c9231 20 int avg_sum;
2236693B 2:29c3d03c9231 21 bool first ;
2236693B 2:29c3d03c9231 22
2236693B 2:29c3d03c9231 23 Ticker sampler;
2236693B 2:29c3d03c9231 24
2236693B 2:29c3d03c9231 25 void sampling () {
2236693B 2:29c3d03c9231 26 unsigned int sample = Ain.read_u16();
2236693B 2:29c3d03c9231 27 sample_buffer[write++] = sample;
2236693B 2:29c3d03c9231 28
2236693B 2:29c3d03c9231 29 write = write%(2*MAX_B);
2236693B 2:29c3d03c9231 30
2236693B 2:29c3d03c9231 31 }
2236693B 2:29c3d03c9231 32
2236693B 2:29c3d03c9231 33 void avg() {
2236693B 2:29c3d03c9231 34 if (first) {
2236693B 2:29c3d03c9231 35 for (int i =0; i <MAX_B; i++) {
2236693B 2:29c3d03c9231 36 avg_buffer[avg_write] = local_buffer[i];
2236693B 2:29c3d03c9231 37 avg_write = (++avg_write) % AVG_LEN;
2236693B 2:29c3d03c9231 38 }
2236693B 2:29c3d03c9231 39 if (write == 0) {
2236693B 2:29c3d03c9231 40 first = false;
2236693B 2:29c3d03c9231 41 }
2236693B 2:29c3d03c9231 42 }
2236693B 2:29c3d03c9231 43 else {
2236693B 2:29c3d03c9231 44 for (int i =0; i <MAX_B; i++) {
2236693B 2:29c3d03c9231 45 int data = local_buffer[i];
2236693B 2:29c3d03c9231 46 avg_sum = avg_sum + data - avg_buffer[avg_write];
2236693B 2:29c3d03c9231 47
2236693B 2:29c3d03c9231 48 avg_buffer[avg_write] = data;
2236693B 2:29c3d03c9231 49 avg_write = (++avg_write) % AVG_LEN;
2236693B 2:29c3d03c9231 50 //get_trend();
2236693B 2:29c3d03c9231 51
2236693B 2:29c3d03c9231 52 }
2236693B 2:29c3d03c9231 53 }
2236693B 2:29c3d03c9231 54
2236693B 2:29c3d03c9231 55 }
2236693B 2:29c3d03c9231 56
2236693B 0:005922ecb765 57 void data_process() {
2236693B 2:29c3d03c9231 58 avg();
2236693B 0:005922ecb765 59 }
2236693B 0:005922ecb765 60
2236693B 0:005922ecb765 61 int main() {
2236693B 0:005922ecb765 62 sampler.attach(&sampling, 0.0125); //Sample at 80Hz
2236693B 0:005922ecb765 63
2236693B 0:005922ecb765 64 while(1) {
2236693B 2:29c3d03c9231 65 if (write-read > MAX_B || read-write > MAX_B) { // |write-read| > MAX_B/2
2236693B 0:005922ecb765 66 for(int i = 0; i < MAX_B/2; i++) {
2236693B 0:005922ecb765 67 local_buffer[i] = sample_buffer[read];
2236693B 0:005922ecb765 68 read = (++read) % MAX_B;
2236693B 0:005922ecb765 69 }
2236693B 0:005922ecb765 70 }
2236693B 0:005922ecb765 71 data_process();
2236693B 0:005922ecb765 72 }
2236693B 0:005922ecb765 73 }
2236693B 0:005922ecb765 74
2236693B 0:005922ecb765 75
2236693B 0:005922ecb765 76