From 2f4da7f2621cad20fa1967e01a801c92b99ed6a9 Mon Sep 17 00:00:00 2001
From: Keith Au <keithau@xmos.com>
Date: Thu, 16 Jan 2020 15:05:41 +0800
Subject: [PATCH] adding variable reference freqency support. Currently only
 48kHz work

---
 lib_xua/api/xua_conf_default.h                   | 7 +++++++
 lib_xua/src/core/endpoint0/xua_ep0_descriptors.h | 8 ++++++++
 lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc    | 4 +++-
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib_xua/api/xua_conf_default.h b/lib_xua/api/xua_conf_default.h
index b22046f0..2810a7d5 100644
--- a/lib_xua/api/xua_conf_default.h
+++ b/lib_xua/api/xua_conf_default.h
@@ -233,6 +233,13 @@
 #define DEFAULT_AUDOUT_FREQ      (48000)
 #endif
 
+/**
+ * @brief Default Reference input sampling frequency
+ */
+#ifndef DEFAULT_AUDIN_FREQ
+#define DEFAULT_AUDIN_FREQ      (48000)
+#endif
+
 /* Audio Class Defines */
 
 /**
diff --git a/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h b/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h
index 3a567417..cfe8a664 100644
--- a/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h
+++ b/lib_xua/src/core/endpoint0/xua_ep0_descriptors.h
@@ -2599,6 +2599,13 @@ unsigned char cfgDesc_Audio1[] =
     NUM_USB_CHAN_OUT_FS,                  /* nrChannels */
     FS_STREAM_FORMAT_OUTPUT_1_SUBSLOT_BYTES,   /* subFrameSize */
     FS_STREAM_FORMAT_OUTPUT_1_RESOLUTION_BITS, /* bitResolution */
+	
+	#ifdef USB_CMD_CFG_SAMP_FREQ
+	USB_OUT_SAMP_FREQ_NUM,
+	CHARIFY_SR(USB_OUT_SAMP_FREQ_0),
+	CHARIFY_SR(USB_OUT_SAMP_FREQ_1),
+	CHARIFY_SR(USB_OUT_SAMP_FREQ_2),
+	#else
 
     num_freqs_a1,                         /* SamFreqType - sample freq count */
 
@@ -2652,6 +2659,7 @@ unsigned char cfgDesc_Audio1[] =
 #if (MIN_FREQ <= 96000) && (MAX_FREQ_FS >= 96000)
     0x00, 0x77, 0x01,                     /* sampleFreq - 96KHz */
 #endif
+	#endif	//USB_CMD_CFG_SAMP_FREQ
 
     /* Standard AS Isochronous Audio Data Endpoint Descriptor 4.6.1.1 */
     0x09,
diff --git a/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc b/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
index 446b9213..eabe3b56 100644
--- a/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
+++ b/lib_xua/src/core/endpoint0/xua_ep0_uacreqs.xc
@@ -55,12 +55,14 @@ extern unsigned char mixSel[MAX_MIX_COUNT][MIX_INPUTS];
 
 #ifdef USB_CMD_CFG_SAMP_FREQ
 extern unsigned int g_curAudOut_SamFreq;
+extern unsigned int g_curAudIn_SamFreq;
 #endif
 
 /* Global var for current frequency, set to default freq */
 #ifdef USB_CMD_CFG_SAMP_FREQ
 #define g_curUSBin_SamFreq g_curAudOut_SamFreq
-unsigned int g_curUSBout_SamFreq = DEFAULT_FREQ;
+#define g_curUSBout_SamFreq g_curAudIn_SamFreq
+
 unsigned int g_curSamFreq = DEFAULT_FREQ;	// should no longer be used
 #else
 unsigned int g_curUSBin_SamFreq = DEFAULT_FREQ;