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Add EMA low-pass filter module #182

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47da14b
Add EMA low-pass filter module
WilliamOu Jan 16, 2026
c2871bf
Automatic Clang-Format: Standardized formatting automatically
github-actions[bot] Jan 16, 2026
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11 changes: 11 additions & 0 deletions Lib/FancyLayers-RENAME/ADC/Inc/gr_adc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -181,6 +181,17 @@ void DMA_Init(DMA_TypeDef *DMA, DMA_Channel channel, uint32_t src_address, uint3

/*
*/

void ADC_UpdateAnalogValues(uint16_t **adcDataValues, volatile uint16_t *new_values, int num_signals, int window_size, uint16_t *weighted_output);

typedef struct {
float y;
float alpha;
uint8_t initialized;
} gr_lpf_ema_t;

void EMA_Init(gr_lpf_ema_t *f, float alpha);

float EMA_Update(gr_lpf_ema_t *f, float x);

#endif
44 changes: 37 additions & 7 deletions Lib/FancyLayers-RENAME/ADC/Src/gr_adc.c
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Expand Up @@ -155,15 +155,45 @@ void ADC_UpdateAnalogValues(uint16_t **adcDataValues, volatile uint16_t *new_val
}
}

/*
EMA
out = out + alpha * (new - out)
void ADC_WeightedOutput(uint16_t *latest, float *weighted_output, int num_signals, float alpha) {
for (int i = 0; i < num_signals; ++i){
weighted_output[i] += ((float)latest[i] - weighted_output) * alpha;
static float Clamp_Alpha(float a)
{
if (a <= 0.0f) {
return 0.0001f;
}
if (a > 1.0f) {
return 1.0f;
}
return a;
}

void EMA_Init(gr_lpf_ema_t *f, float alpha)
{
if (!f) {
return;
}
f->alpha = clamp_alpha(alpha);
f->y = 0.0f;
f->initialized = 0;
}

float EMA_Update(gr_lpf_ema_t *f, float x)
{
if (!f) {
return x;
}

const float a = clamp_alpha(f->alpha);

if (!f->initialized) {
f->y = x;
f->initialized = 1;
return f->y;
}

// EMA low-pass filter: y = y + a*(x - y)
f->y = f->y + a * (x - f->y);
return f->y;
}
*/

// void updateAnalogInputs(void)
// {
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