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AR FFT task optimization - wait so I2S can fill its buffers

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It seems that waiting first (before reading I2S) is much better than waiting after FFT is completed.
This commit is contained in:
Frank 2022-08-08 13:53:46 +02:00
parent 3a8c99d43c
commit 924073424f
1 changed files with 8 additions and 5 deletions
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13
usermods/audioreactive/audio_reactive.h
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@ -92,7 +92,7 @@ static float multAgc = 1.0f; // sample * multAgc = sampleAgc.
// lib_deps += https://github.com/kosme/arduinoFFT#develop @ 1.9.2
#define FFT_SPEED_OVER_PRECISION // enables use of reciprocals (1/x etc), and an a few other speedups
#define FFT_SQRT_APPROXIMATION // enables "quake3" style inverse sqrt
//#define sqrt(x) sqrtf(x) // little hack that reduces FFT time by 50% on ESP32 (as alternative to FFT_SQRT_APPROXIMATION)
#define sqrt(x) sqrtf(x) // little hack that reduces FFT time by 50% on ESP32 (as alternative to FFT_SQRT_APPROXIMATION)
#endif
#include "arduinoFFT.h"
@ -155,9 +155,10 @@ void FFTcode(void * parameter)
// see https://www.freertos.org/vtaskdelayuntil.html
const TickType_t xFrequency = FFT_MIN_CYCLE * portTICK_PERIOD_MS;
TickType_t xLastWakeTime = xTaskGetTickCount();
//const TickType_t xFrequency_2 = (FFT_MIN_CYCLE * portTICK_PERIOD_MS) / 2;
for(;;) {
TickType_t xLastWakeTime = xTaskGetTickCount();
delay(1); // DO NOT DELETE THIS LINE! It is needed to give the IDLE(0) task enough time and to keep the watchdog happy.
// taskYIELD(), yield(), vTaskDelay() and esp_task_wdt_feed() didn't seem to work.
@ -168,6 +169,9 @@ void FFTcode(void * parameter)
continue;
}
vTaskDelayUntil( &xLastWakeTime, xFrequency); // release CPU, and let I2S fill its buffers
//vTaskDelayUntil( &xLastWakeTime, xFrequency_2); // release CPU, and let I2S fill its buffers
#ifdef WLED_DEBUG
uint64_t start = esp_timer_get_time();
#endif
@ -275,14 +279,13 @@ void FFTcode(void * parameter)
}
#ifdef WLED_DEBUG
//fftTime = ((millis() - start)*3 + fftTime*7)/10;
if (start < esp_timer_get_time()) { // filter out overflows
unsigned long fftTimeInMillis = ((esp_timer_get_time() - start) +500ULL) / 1000ULL; // "+500" to ensure proper rounding
fftTime = (fftTimeInMillis*3 + fftTime*7)/10; // smooth
}
#endif
vTaskDelayUntil( &xLastWakeTime, xFrequency); // release CPU, by waiting until FFT_MIN_CYCLE is over
//vTaskDelayUntil( &xLastWakeTime, xFrequency_2); // release CPU, by waiting until FFT_MIN_CYCLE is over
// release second sample to volume reactive effects.
// Releasing a second sample now effectively doubles the "sample rate"
micDataReal = maxSample2;
@ -645,8 +648,8 @@ class AudioReactive : public Usermod {
samplePeak = false;
udpSamplePeak = false;
}
//if (userVar1 == 0) samplePeak = 0;
// Poor man's beat detection by seeing if sample > Average + some value.
// if (sample > (sampleAvg + maxVol) && millis() > (timeOfPeak + 200)) {
if ((fftBin[binNum] > maxVol) && (millis() > (timeOfPeak + 100))) { // This goes through ALL of the 255 bins