portion-of-render.cpp

void loop(void*)
{
	unsigned int logIdx = 0;
	std::vector<float> logs(10000);
	unsigned int writeFileSize = logs.size() + 5000;
	freq_mod_tone_bela.setBufferSize(writeFileSize);
	while(!Bela_stopRequested())
	{

		// Read locations from Trill sensor
		unsigned int q = touchSensor.size() < NUM_TOUCH ? touchSensor.size() : NUM_TOUCH;
		for(unsigned int n = 0; n < q; ++n){

			// read current sensor & number of active touches.
			touchSensor[n]->readI2C();
			gNumActiveTouches[n] = touchSensor[n]->getNumTouches();

			// loop thru active touches, get size & location.
			for(unsigned int i = 0; i < gNumActiveTouches[n]; i++) {
				gTouchLocation[n][i] = touchSensor[n]->touchLocation(i);
				gTouchSize[n][i] = touchSensor[n]->touchSize(i);
			}
			// For all inactive touches, set location and size to 0
			for(unsigned int i = gNumActiveTouches[n]; i < NUM_TOUCH; i++) {
				gTouchLocation[n][i] = 0.0;
				gTouchSize[n][i] = 0.0;
			}
			// if there are active touches.
			if(touchSensor[n]->getNumTouches())
			{
				past_read[n] = read_out[n]; // store past read.
				read_out[n] = gTouchLocation[n][0]; // get touch location for first touch (of 5).
				active_touch[n]=1.0; // variable to tell audio loop whether there is active touch.

				// now convert position to value between 0 & 360.
				read_out_degrees[n] = read_out[n] * 360.0;

				// now compute sine of that value to get y-coordinate.
				// if using bar sensor, don't use y-value.
				if(n==1){
					y_coordinate_now[n] = sinf(read_out_degrees[n]*M_PI/180.0) * 0.5; //NECESSARY WITH RING.
				} else {
					y_coordinate_now[n] = cosf(read_out_degrees[n]*M_PI/180.0) * 0.5;// if bar sensor, motion is along x-axis.
				}

				// determine frequency.
				frequency[n] = map(y_coordinate_now[n], -0.5, 0.5, peakFrequency[n]-freqRange_aroundPeak, peakFrequency[n]+freqRange_aroundPeak);

				// log sensor data IF new touch location.
				if(read_out[n]!=past_read[n]){
					float data_out_now[5] =	{ timestamp_ms, float(n), read_out[n], y_coordinate_now[n], frequency[n] };
					//instead of logging every time ...
					//freq_mod_tone_bela.log(data_out_now,5);
					//we log a larger buffer at once, so the WriteFile thread does not run in parallel to us
					for(unsigned int n = 0; n < 5; ++n)
					{
						logs[logIdx++] = data_out_now[n]; // fill an array in memory
						//if((logIdx % 100) == 0)
							//printf("logIdx: %u\n", logIdx);
						if(logs.size() == logIdx)
						{
							// when the array is full, dump it to disk
							// given how we have setBufferSize() above, WriteFile's buffer
							// should have enough space for all of logs
							printf("Dumping\n");
							freq_mod_tone_bela.log(logs.data(), logIdx);
							logIdx = 0;
							// now we need to wait until the WriteFile thread has written everything to disk
							// unfortunately it will always keep up to 4096 samples inside its buffer
							while(freq_mod_tone_bela.getBufferStatus() < (writeFileSize - logs.size()) / writeFileSize)
							{
								printf("waiting %f\n", freq_mod_tone_bela.getBufferStatus());
								usleep(10000);
							}
							printf("Running\n");
						}
					}
					gMyVar[n] = gTouchLocation[n][0];
				}
			} else {
				active_touch[n]=0.0;
			}
		}

	//usleep(gTaskSleepTime);
	}
	// send WriteFile any leftover stuff
	freq_mod_tone_bela.log(logs.data(), logIdx);
}