Sample rate @ 16 kHz + bytes per sample @ 2

batica81 · May 11, 2021 · 01b4221 · 01b4221
1 parent 509b75b
commit 01b4221
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Showing 3 changed files with 6 additions and 6 deletions.
diff --git a/examples/usb_microphone/main.c b/examples/usb_microphone/main.c
@@ -73,12 +73,12 @@ int main(void)
   tusb_init();
 
   // Init values
-  sampFreq = 44100;
+  sampFreq = 16000;
   clkValid = 1;
 
   sampleFreqRng.wNumSubRanges = 1;
-  sampleFreqRng.subrange[0].bMin = 44100;
-  sampleFreqRng.subrange[0].bMax = 44100;
+  sampleFreqRng.subrange[0].bMin = 16000;
+  sampleFreqRng.subrange[0].bMax = 16000;
   sampleFreqRng.subrange[0].bRes = 0;
 
   while (1)

diff --git a/examples/usb_microphone/tusb_config.h b/examples/usb_microphone/tusb_config.h
@@ -100,8 +100,8 @@ extern "C" {
 #define CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX			2
 
 // EP and buffer size - for isochronous EP´s, the buffer and EP size are equal (different sizes would not make sense)
-#define CFG_TUD_AUDIO_EPSIZE_IN                                       48*CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX*CFG_TUD_AUDIO_N_CHANNELS_TX    // 48 Samples (48 kHz) x 2 Bytes/Sample x 1 Channels
-#define CFG_TUD_AUDIO_TX_FIFO_SIZE                                    48*2                                                                  // 48 Samples (48 kHz) x 2 Bytes/Sample (1/2 word)
+#define CFG_TUD_AUDIO_EPSIZE_IN                                       16*CFG_TUD_AUDIO_N_BYTES_PER_SAMPLE_TX*CFG_TUD_AUDIO_N_CHANNELS_TX    //  16 Samples (16 kHz) x 2 Bytes/Sample x 1 Channels
+#define CFG_TUD_AUDIO_TX_FIFO_SIZE                                    16*2                                                                  // 16 Samples (16 kHz) x 2 Bytes/Sample (1/2 word)
 
 // Number of Standard AS Interface Descriptors (4.9.1) defined per audio function - this is required to be able to remember the current alternate settings of these interfaces - We restrict us here to have a constant number for all audio functions (which means this has to be the maximum number of AS interfaces an audio function has and a second audio function with less AS interfaces just wastes a few bytes)
 #define CFG_TUD_AUDIO_N_AS_INT 			          1

diff --git a/examples/usb_microphone/usb_descriptors.c b/examples/usb_microphone/usb_descriptors.c
@@ -102,7 +102,7 @@ uint8_t const desc_configuration[] =
     TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, TUSB_DESC_CONFIG_ATT_REMOTE_WAKEUP, 100),
 
     // Interface number, string index, EP Out & EP In address, EP size
-    TUD_AUDIO_MIC_DESCRIPTOR(/*_itfnum*/ ITF_NUM_AUDIO_CONTROL, /*_stridx*/ 0, /*_nBytesPerSample*/ 3, /*_nBitsUsedPerSample*/ 24, /*_epin*/ 0x80 | EPNUM_AUDIO, /*_epsize*/ 48*4)
+    TUD_AUDIO_MIC_DESCRIPTOR(/*_itfnum*/ ITF_NUM_AUDIO_CONTROL, /*_stridx*/ 0, /*_nBytesPerSample*/ 2, /*_nBitsUsedPerSample*/ 16, /*_epin*/ 0x80 | EPNUM_AUDIO, /*_epsize*/ 16*2)
 };
 
 // Invoked when received GET CONFIGURATION DESCRIPTOR