TLV320: tweaks to library

control_tlv320aic3206.h

@@ -1,11 +1,15 @@
-/* Extension control files for TLV320AIC3206
- * Copyright (c) 2016, Creare, bpf@creare.com
- *
- *
+/* 
+	control_tlv320aic3206
+	
+	Created: BPF@creare.com  Jan-Feb 2017
+
+	Purpose: Control module for TLV320AIC3206 compatible with Teensy Audio Library
+ 
+	License: MIT License.  Use at your own risk.
  */
 
-#ifndef control_tlv320_h_
-#define control_tlv320_h_
+#ifndef control_tlv320aic3206_h_
+#define control_tlv320aic3206_h_
 
 #include "AudioControl.h"
 
@@ -15,9 +19,10 @@ public:
 	bool enable(void);
 	bool disable(void);
 	bool volume(float n);
-	bool inputLevel(float n);
+	bool volume_dB(float n);
+	bool inputLevel(float n);  //dummy to be compatible with Teensy Audio Library
 	bool inputSelect(int n);
-	bool micGain(float n);
+	bool setInputGain_dB(float n);
 	bool setMicBias(int n);
 
 private:

control_tlv320aic_3206.cpp

@@ -156,6 +156,7 @@ bool AudioControlTLV320AIC3206::disable(void) {
   return true;
 }
 
+//dummy function to keep compatible with Teensy Audio Library
 bool AudioControlTLV320AIC3206::inputLevel(float volume) {
   return false;
 }
@@ -269,7 +270,7 @@ void AudioControlTLV320AIC3206::aic_initADC() {
 }
 
 // set MICPGA volume, 0-47.5dB in 0.5dB setps
-bool AudioControlTLV320AIC3206::micGain(float volume) {
+bool AudioControlTLV320AIC3206::setInputGain_dB(float volume) {
   if (volume < 0.0) {
     volume = 0.0; // 0.0 dB
     Serial.println("WARNING: Attempting to set MIC volume outside range");
@@ -298,8 +299,18 @@ bool AudioControlTLV320AIC3206::micGain(float volume) {
 #define TYMPAN_DAC_VOLUME_LEFT_REG 0x0041 // page 0 reg 65
 #define TYMPAN_DAC_VOLUME_RIGHT_REG 0x0042 // page 0 reg 66
 
-// -63.6 to +24 dB in 0.5dB steps.  uses signed 8-bit
+
+//volume control, similar to Teensy Audio Board
+// value between 0.0 and 1.0.  Set to span -58 to +15 dB
 bool AudioControlTLV320AIC3206::volume(float volume) {
+	volume = max(0.0, min(1.0, volume));
+	float vol_dB = -58.f + (15.0 - (-58.0f)) * volume;
+	volume_dB(vol_dB);
+	return true;
+}
+
+// -63.6 to +24 dB in 0.5dB steps.  uses signed 8-bit
+bool AudioControlTLV320AIC3206::volume_dB(float volume) {
 
   // Constrain to limits
   if (volume > 24.0) {

examples/Tympan_TLV320AIC3206/Tympan_TLV320AIC3206.ino

@@ -27,12 +27,11 @@ AudioConnection          patchCord2(audioInput, 1, audioOutput, 1);
 void setup(void)
 {
   //allocate the audio memory first
-  AudioMemory(160);  //big number to accomodate the delay effect
+  AudioMemory(10);  //big number to accomodate the delay effect
 
   //begin the serial comms
-  Serial.begin(115200);
-  delay(500);
-  Serial.println("Tympan_TLV320AIC: starting...");
+  Serial.begin(115200);  delay(500);
+  Serial.println("Tympan_TLV320AIC3206: starting...");
   
   // Setup the TLV320
   tlv320aic3206_1.enable(); // activate AIC
@@ -51,8 +50,8 @@ void setup(void)
   //  tlv320aic3206_1.setMicBias(TYMPAN_MIC_BIAS_VSUPPLY); // set mic bias to supply voltage
 
   // VOLUMES
-  tlv320aic3206_1.volume(10);  // -63.6 to +24 dB in 0.5dB steps.  uses float
-  tlv320aic3206_1.micGain(10); // set MICPGA volume, 0-47.5dB in 0.5dB setps
+  tlv320aic3206_1.volume_dB(10);  // -63.6 to +24 dB in 0.5dB steps.  uses float
+  tlv320aic3206_1.setInputGain_dB(10); // set MICPGA volume, 0-47.5dB in 0.5dB setps
 
   Serial.println("Done");
 }

keywords.txt

@@ -11,7 +11,8 @@ AudioControlTLV320AIC3206	KEYWORD1
 inputSelect		KEYWORD2
 setMicBias		KEYWORD2
 volume			KEYWORD2
-micGain			KEYWORD2
+volume_dB		KEYWORD2
+setInputGain_dB		KEYWORD2
 
 AudioControlSGTL5000_Extended	KEYWORD1
 micBiasEnable		KEYWORD2