Hardware test for 3ds mic rate at which it writes to the shared mem buffer

3ds_mic_update_rate_test.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <3ds.h>
#include <time.h>

void sampleTest(MICU_SampleRate sampleRate) {
	if(R_SUCCEEDED(MICU_StartSampling(MICU_ENCODING_PCM16_SIGNED, sampleRate, 0, micGetSampleDataSize(), true))) printf("Now recording.\n");

	u64 start = svcGetSystemTick();
	u32 last_offset = micGetLastSampleOffset();
	u32 count = 0;
	u32 lame_way_to_wait_some_time = 0;
	while (lame_way_to_wait_some_time++ < 10000000) {
		u32 this_offset = micGetLastSampleOffset();
		if (last_offset != this_offset) {
			last_offset = this_offset;
			++count;
		}
	}

	printf("Offset changed %lu times in %llu ticks\n\n", count, svcGetSystemTick() - start);
	if(R_FAILED(MICU_StopSampling())) printf("Failed to stop sampling.\n");
}

int main()
{
	gfxInitDefault();
	consoleInit(GFX_BOTTOM, NULL);

	u32 micbuf_size = 0x30000;
	u8* micbuf = memalign(0x1000, micbuf_size);

	printf("Initializing CSND...\n");
	if(R_FAILED(csndInit()))
	{
		printf("Could not initialize CSND.\n");
	} else printf("CSND initialized.\n");

	printf("Initializing MIC...\n");
	if(R_FAILED(micInit(micbuf, micbuf_size)))
	{
		printf("Could not initialize MIC.\n");
	} else printf("MIC initialized.\n");

	u32 audiobuf_size = 0x100000;
	u8* audiobuf = linearAlloc(audiobuf_size);
	printf("Starting sample rate testing. Please wait a second or so for each test\n");
	printf("Sample Rate 8180\n");
	sampleTest(MICU_SAMPLE_RATE_8180);

	printf("Sample Rate 10910\n");
	sampleTest(MICU_SAMPLE_RATE_10910);

	printf("Sample Rate 16360\n");
	sampleTest(MICU_SAMPLE_RATE_16360);

	printf("Sample Rate 32730\n");
	sampleTest(MICU_SAMPLE_RATE_32730);

	printf("Press START to exit.\n");

	while(aptMainLoop())
	{
		hidScanInput();
		gspWaitForVBlank();

		u32 kDown = hidKeysDown();
		if (kDown & KEY_START)
			break; // break in order to return to hbmenu

		gfxFlushBuffers();
		gfxSwapBuffers();
	}

	linearFree(audiobuf);

	micExit();
	free(micbuf);

	csndExit();
	gfxExit();
	return 0;
}