Add ability to control two SGTL5000 chips

control_sgtl5000.cpp

 #define DAP_COEF_WR_A2_MSB		0x0138
 #define DAP_COEF_WR_A2_LSB		0x013A
 
-#define SGTL5000_I2C_ADDR  0x0A  // CTRL_ADR0_CS pin low (normal configuration)
-//#define SGTL5000_I2C_ADDR  0x2A // CTRL_ADR0_CS  pin high
+#define SGTL5000_I2C_ADDR_CS_LOW	0x0A  // CTRL_ADR0_CS pin low (normal configuration)
+#define SGTL5000_I2C_ADDR_CS_HIGH	0x2A // CTRL_ADR0_CS  pin high
 
 
+void AudioControlSGTL5000::setAddress(uint8_t level)
+{
+	if (level == LOW) {
+		i2c_addr = SGTL5000_I2C_ADDR_CS_LOW;
+	} else {
+		i2c_addr = SGTL5000_I2C_ADDR_CS_HIGH;
+	}
+}
 
 bool AudioControlSGTL5000::enable(void)
 {
 unsigned int AudioControlSGTL5000::read(unsigned int reg)
 {
 	unsigned int val;
-	Wire.beginTransmission(SGTL5000_I2C_ADDR);
+	Wire.beginTransmission(i2c_addr);
 	Wire.write(reg >> 8);
 	Wire.write(reg);
 	if (Wire.endTransmission(false) != 0) return 0;
-	if (Wire.requestFrom(SGTL5000_I2C_ADDR, 2) < 2) return 0;
+	if (Wire.requestFrom((int)i2c_addr, 2) < 2) return 0;
 	val = Wire.read() << 8;
 	val |= Wire.read();
 	return val;
 bool AudioControlSGTL5000::write(unsigned int reg, unsigned int val)
 {
 	if (reg == CHIP_ANA_CTRL) ana_ctrl = val;
-	Wire.beginTransmission(SGTL5000_I2C_ADDR);
+	Wire.beginTransmission(i2c_addr);
 	Wire.write(reg >> 8);
 	Wire.write(reg);
 	Wire.write(val >> 8);

control_sgtl5000.h

 class AudioControlSGTL5000 : public AudioControl
 {
 public:
+	AudioControlSGTL5000(void) : i2c_addr(0x0A) { }
+	void setAddress(uint8_t level);
 	bool enable(void);
 	bool disable(void) { return false; }
 	bool volume(float n) { return volumeInteger(n * 129 + 0.499); }
 	bool muted;
 	bool volumeInteger(unsigned int n); // range: 0x00 to 0x80
 	uint16_t ana_ctrl;
+	uint8_t i2c_addr;
 	unsigned char calcVol(float n, unsigned char range);
 	unsigned int read(unsigned int reg);
 	bool write(unsigned int reg, unsigned int val);

examples/HardwareTesting/SGTL5000/QuadChannelOutput/QuadChannelOutput.ino

+// Quad channel output test
+// Play two WAV files on two audio shields.
+//
+// TODO: add info about required hardware connections here....
+//
+// Data files to put on your SD card can be downloaded here:
+//   http://www.pjrc.com/teensy/td_libs_AudioDataFiles.html
+//
+// This example code is in the public domain.
+
+#include <Audio.h>
+#include <Wire.h>
+#include <SPI.h>
+#include <SD.h>
+#include <SerialFlash.h>
+
+AudioPlaySdWav           playSdWav1;
+AudioPlaySdWav           playSdWav2;
+AudioOutputI2SQuad       audioOutput;
+AudioConnection          patchCord1(playSdWav1, 0, audioOutput, 0);
+AudioConnection          patchCord2(playSdWav1, 1, audioOutput, 1);
+AudioConnection          patchCord3(playSdWav2, 0, audioOutput, 2);
+AudioConnection          patchCord4(playSdWav2, 1, audioOutput, 3);
+AudioControlSGTL5000     sgtl5000_1;
+AudioControlSGTL5000     sgtl5000_2;
+
+// Use these with the audio adaptor board
+#define SDCARD_CS_PIN    10
+#define SDCARD_MOSI_PIN  7
+#define SDCARD_SCK_PIN   14
+
+void setup() {
+  Serial.begin(9600);
+  AudioMemory(10);
+  
+  sgtl5000_1.setAddress(LOW);
+  sgtl5000_1.enable();
+  sgtl5000_1.volume(0.5);
+
+  sgtl5000_2.setAddress(HIGH);
+  sgtl5000_2.enable();
+  sgtl5000_2.volume(0.5);
+
+  SPI.setMOSI(SDCARD_MOSI_PIN);
+  SPI.setSCK(SDCARD_SCK_PIN);
+  if (!(SD.begin(SDCARD_CS_PIN))) {
+    // stop here, but print a message repetitively
+    while (1) {
+      Serial.println("Unable to access the SD card");
+      delay(500);
+    }
+  }
+}
+
+void loop() {
+  if (playSdWav1.isPlaying() == false) {
+    Serial.println("Start playing 1");
+    playSdWav1.play("SDTEST2.WAV");
+    delay(10); // wait for library to parse WAV info
+  }
+  if (playSdWav2.isPlaying() == false) {
+    Serial.println("Start playing 2");
+    playSdWav2.play("SDTEST4.WAV");
+    delay(10); // wait for library to parse WAV info
+  }
+}
+

keywords.txt

 trigger	KEYWORD2
 length	KEYWORD2
 threshold	KEYWORD2
+setAddress	KEYWORD2
 enable	KEYWORD2
 enableIn	KEYWORD2
 enableOut	KEYWORD2