mirror of https://github.com/ArduPilot/ardupilot
Heavy Accel Filter + mild Gyro Filter. To use, filter_result must be set to true on ADC. Off by default.
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@ -128,7 +128,7 @@ ISR (TIMER2_OVF_vect)
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// Constructors ////////////////////////////////////////////////////////////////
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// Constructors ////////////////////////////////////////////////////////////////
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AP_ADC_ADS7844::AP_ADC_ADS7844() :
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AP_ADC_ADS7844::AP_ADC_ADS7844() :
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_filter_index(0),
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_filter_index_accel(0),
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filter_result(false)
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filter_result(false)
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{
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{
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}
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}
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@ -161,7 +161,6 @@ void AP_ADC_ADS7844::Init(void)
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}
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}
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last_ch6_micros = micros();
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last_ch6_micros = micros();
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_filter_index = 0;
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// Enable Timer2 Overflow interrupt to capture ADC data
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// Enable Timer2 Overflow interrupt to capture ADC data
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TIMSK2 = 0; // Disable interrupts
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TIMSK2 = 0; // Disable interrupts
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@ -226,35 +225,44 @@ uint32_t AP_ADC_ADS7844::Ch6(const uint8_t *channel_numbers, uint16_t *result)
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result[i] = sum[i] / count[i];
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result[i] = sum[i] / count[i];
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}
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}
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// filter ch 0,1,2 for smoother Gyro output.
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if(filter_result){
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if(filter_result){
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uint32_t _filter_sum;
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uint32_t _sum_accel;
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for (i = 0; i < 6; i++) {
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// simple Gyro Filter
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for (i = 0; i < 3; i++) {
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// add prev filtered value to new raw value, divide by 2
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result[i] = (_prev_gyro[i] + result[i]) >> 1;
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// remember the filtered value
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_prev_gyro[i] = result[i];
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}
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// Accel filter
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for (i = 0; i < 3; i++) {
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// move most recent result into filter
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// move most recent result into filter
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_filter[i][_filter_index] = result[i];
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_filter_accel[i][_filter_index_accel] = result[i+3];
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// clear the sum
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_sum_accel = 0;
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_filter_sum = 0;
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// sum the filter
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// sum the filter
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for (uint8_t n = 0; n < ADC_FILTER_SIZE; n++) {
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for (uint8_t n = 0; n < ADC_ACCEL_FILTER_SIZE; n++) {
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_filter_sum += _filter[i][n];
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_sum_accel += _filter_accel[i][n];
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}
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}
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// filter does a moving average on last 4 reads, sums half with
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// filter does a moving average on last 8 reads, sums half with half of last filtered value
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// half of last filtered value
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result[i] = (_filter_sum >> 3) + (_prev[i] >> 1); // divide by 8, divide by 2
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// save old result
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// save old result
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_prev[i] = result[i];
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_prev_accel[i] = result[i+3] = (_sum_accel >> 4) + (_prev_accel[i] >> 1); // divide by 16, divide by 2
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}
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}
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// increment filter index
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// increment filter index
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_filter_index++;
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_filter_index_accel++;
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// loop our filter
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// loop our filter
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if(_filter_index == ADC_FILTER_SIZE)
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if(_filter_index_accel == ADC_ACCEL_FILTER_SIZE)
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_filter_index = 0;
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_filter_index_accel = 0;
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}
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}
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@ -10,8 +10,8 @@
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#define ADC_SPICLOCK 52 // SCK
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#define ADC_SPICLOCK 52 // SCK
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#define ADC_CHIP_SELECT 33 // PC4 9 // PH6 Puerto:0x08 Bit mask : 0x40
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#define ADC_CHIP_SELECT 33 // PC4 9 // PH6 Puerto:0x08 Bit mask : 0x40
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// DO NOT CHANGE FROM 4
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// DO NOT CHANGE FROM 8!!
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#define ADC_FILTER_SIZE 4
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#define ADC_ACCEL_FILTER_SIZE 8
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#include "AP_ADC.h"
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#include "AP_ADC.h"
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#include <inttypes.h>
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#include <inttypes.h>
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@ -30,9 +30,10 @@ class AP_ADC_ADS7844 : public AP_ADC
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bool filter_result;
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bool filter_result;
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private:
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private:
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uint16_t _filter[6][ADC_FILTER_SIZE];
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uint16_t _filter_accel[3][ADC_ACCEL_FILTER_SIZE];
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uint16_t _prev[6];
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uint16_t _prev_gyro[3];
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uint8_t _filter_index;
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uint16_t _prev_accel[3];
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uint8_t _filter_index_accel;
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};
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};
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