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wm8960-PiHatDac.ino
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// GPL3 license Tobias van Dyk Aug 2020
// Based on Wolfson WM8960 STM32 demo code from Waveshare
// Demo code BSD license from STMicroelectronics - folder STM32-Open103Z
// Also based on WM8960 ALSA SoC Audio driver from Wolfson Microelectronics
// 2007 GPL2 license Liam Girdwood - folder WM8960-ALSA-driver
// Teensy libraries property of PJRC.com
////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// WM8960 i2c ADDRESS = 0x1a
//
// WM8960-DAC Teensy 4.0 and 4.1 Teensy 3.6 WM8960 RPi GPIO Hat Bus
// +5v +5v 2,4 +5v
// 1,2 VCC +3v3 +3v3
// 3,4 GND GND GND (not AGnd) 6 GND
// 5,6 SDA 18 SDA 18 SDA 3 SDA i2c
// 7,8 SCL 19 SCL 19 SCL 5 SCL i2c
// 9,10 SCLK 21 BCLK 9 BCLK 12 PCMCLK BCLK
// 11,12 WS 20 LRCLK 23 LRCLK 35 PCM_FS LRCLK i2s Frame clock input
// 13 RXSDA 7 OUT1A 22 40 PCM_OUT i2s Data output
// 14 TXSDA 8 IN1 13 RX 38 PCM_IN i2s Data input
// 15 RX-MCLK MCLK N/A i2s Master Clock (Send)
// 16 TX-MCLK MCLK N/A i2s Master Clock (Receive)
// MCLK available but not connected MCLK not available at GPIO connector
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#include <Wire.h>
int led = LED_BUILTIN;
#define WM8960_ADDRESS 0x1A
//register values
static uint16_t WM8960_REG_VAL[56] =
{
0x0097, 0x0097, 0x0000, 0x0000, 0x0000, 0x0008, 0x0000, 0x000A,
0x01C0, 0x0000, 0x00FF, 0x00FF, 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x007B, 0x0100, 0x0032, 0x0000, 0x00C3, 0x00C3, 0x01C0,
0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000,
0x0100, 0x0100, 0x0050, 0x0050, 0x0050, 0x0050, 0x0000, 0x0000,
0x0000, 0x0000, 0x0040, 0x0000, 0x0000, 0x0050, 0x0050, 0x0000,
0x0000, 0x0037, 0x004D, 0x0080, 0x0008, 0x0031, 0x0026, 0x00ED
};
#include <Audio.h>
#include <SPI.h>
// GUItool: begin automatically generated code
AudioInputUSB usb1; //xy=121,162
AudioOutputI2S i2s1; //xy=559,166
AudioConnection patchCord1(usb1, 0, i2s1, 0);
AudioConnection patchCord2(usb1, 1, i2s1, 1);
// GUItool: end automatically generated code
int delay1 = 10;
int delay2 = 500;
//////////////////////////////////////////////////////////////////////////////////////////////////
// Registers of WM8960 are 9-bit. Thus, when we send data to it,
// should split data to two bytes and add the ID of register to recognized before
// transmitting. The ID of register flagged by 7-bit.
//
// Byte0 = bit7 to bit1 = device address, bit0 = read/write
// Byte1 = bit7 to bit1 = register number 0-57, bit0 = MSB bit8 of register value
// Byte2 = bit7-bit0 register value
/////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////
// WM89060 Write RegisterNumber = Value
/////////////////////////////////////////
uint8_t WM8960_Write_Reg(uint8_t reg, uint16_t dat)
{
uint8_t res,I2C_Data[2];
I2C_Data[0] = (reg<<1)|((uint8_t)((dat>>8)&0x0001)); //RegAddr
I2C_Data[1] = (uint8_t)(dat&0x00FF); //RegValue
//digitalWrite(led, HIGH); // briefly flash the LED
Wire.beginTransmission(WM8960_ADDRESS); // transmit to device lsb=0 => write
//Wire.write(I2C_Data[0]); // buffer 1 byte reg1 in b7-b1
//Wire.write(I2C_Data[1]); // buffer 1 byte lsb of val1
Wire.write(I2C_Data, 2); // buffer 1 byte lsb of val1
res = Wire.endTransmission(); // transmit buffer and then stop
if(res == 0) { WM8960_REG_VAL[reg] = dat;
//digitalWrite(led, LOW);
}
return res;
}
/////////////////////////////////////////
// WM89060 Inititialise
/////////////////////////////////////////
uint8_t WM89060_Init(void) {
uint8_t res;
//////////////////////////////////////////////////////////
// Reset Device 0x0f, 0x0000
// #define WM8960_RESET 0xf
// reg<<1 register now in bit7-bit1
// msb=b8 (ninth bit) of val now in bit0
// uint8_t reg1 = ((reg << 1) |(uint8_t)((val >> 8) & 1))
// val = lsb b7-b0 val and with val msb b15-b18 all = 0
////////////////////////////////////////////////////////
res = WM8960_Write_Reg(0x0f, 0x0000);
//if (res == 0) Serial.println("WM8960 reset completed"); else return res;
delay(delay1);
// Set Power Source
// #define WM8960_POWER1 0x19
// #define WM8960_POWER2 0x1a bits 6,5,4,3 HP and Sp enable
// #define WM8960_ADDCTL3 0x1b **************
// #define WM8960_POWER3 0x2f
res = WM8960_Write_Reg(0x19, 1<<8 | 1<<7 | 1<<6);
delayMicroseconds(delay2);
res += WM8960_Write_Reg(0x1A, 1<<8 | 1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<3 | 1);
delayMicroseconds(delay2);
res += WM8960_Write_Reg(0x2F, 1<<3 | 1<<2);
//if (res == 0) Serial.println("WM8960 power 1,2,3 completed"); else return res;
delay(delay1);
// Configure clock
// MCLK->PLL->SYSCLK->DAC/ADC sample Freq = 24MHz/544.217 = 44.100kHz
// See calculation pages 60 and table 44 in manual
// f2 = 4 x 2 x 11.2896Hz = 90.3168MHz
// R = 90.316 / 12 = 7.5264
// PLLN = int R = 7
// k = int ( 2^24 x (7.5264 – 7)) = 8831526
// N = 7
// Fractional 24bit value = 86C226h
res = WM8960_Write_Reg(0x04, 0x0001); // Select PLL
//if (res == 0) Serial.println("WM8960 Configure clock"); else return res;
delay(delay1);
// Configure PLL 1 0011 0111 = 37h
// 00010 0111 27h
res = WM8960_Write_Reg(0x34, 0x0027); // Select PLL 1
delay(delay1);
// Configure PLL 2 bit 8 reserved 7-0 data
res = WM8960_Write_Reg(0x35, 0x0086); // Select PLL 2
delay(delay1);
// Configure PLL 3
res = WM8960_Write_Reg(0x36, 0x00C2); // Select PLL 3
delay(delay1);
// Configure PLL 4
res = WM8960_Write_Reg(0x37, 0x0026); // Select PLL 4
delay(delay1);
// Configure ADC/DAC
// bit0 = 1 ADC High Pass Filter Disable
// bit1,2 De-emphasis 00 = No de-emphasis
res = WM8960_Write_Reg(0x05, 0x0000);
//if (res == 0) Serial.println("WM8960 Configure ADC/DAC"); else return res;
delay(delay1);
// Configure audio interface
// I2S format 16 bits word length
res = WM8960_Write_Reg(0x07, 0x0002);
//if (res == 0) Serial.println("WM8960 Configure audio interface"); else return res;
delay(delay1);
// Configure HP_L and HP_R OUTPUTS was 0x006F | 0x0100
res = WM8960_Write_Reg(0x02, 0x007F | 0x0100); //LOUT1 Volume Set
delayMicroseconds(delay2);
res += WM8960_Write_Reg(0x03, 0x007F | 0x0100); //ROUT1 Volume Set
//if (res == 0) Serial.println("WM8960 Configure HP_L and HP_R OUTPUTS"); else return res;
delay(delay1);
// Configure SPK_RP and SPK_RN
res = WM8960_Write_Reg(0x28, 0x007F | 0x0100); //Left Speaker Volume
delayMicroseconds(delay2);
res += WM8960_Write_Reg(0x29, 0x007F | 0x0100); //Right Speaker Volume
//if (res == 0) Serial.println("WM8960 Configure SPK_RP and SPK_RN"); else return res;
delay(delay1);
// Enable the OUTPUTS 0x0037 default
res = WM8960_Write_Reg(0x31, 0x00F7); //Enable Class D Speaker Outputs
//if (res == 0) Serial.println("WM8960 Enable Class D Speaker Outputs"); else return res;
delay(delay1);
// Configure DAC volume
res = WM8960_Write_Reg(0x0a, 0x00FF | 0x0100);
delayMicroseconds(delay2);
res += WM8960_Write_Reg(0x0b, 0x00FF | 0x0100);
//if (res == 0) Serial.println("WM8960 Configure DAC volume"); else return res;
delay(delay1);
// 3D
// WM8960_Write_Reg(0x10, 0x001F);
// Configure MIXER
res = WM8960_Write_Reg(0x22, 1<<8 | 1<<7);
delayMicroseconds(delay2);
res += WM8960_Write_Reg(0x25, 1<<8 | 1<<7);
//if (res == 0) Serial.println("WM8960 Configure MIXER"); else return res;
delay(delay1);
// Jack Detect - not hardware configured on HAT board
// res = WM8960_Write_Reg(0x18, 1<<6 | 0<<5);
res = WM8960_Write_Reg(0x18, 0x0000);
delayMicroseconds(delay2);
//res += WM8960_Write_Reg(0x17, 0x01C3);
delayMicroseconds(delay2);
//res += WM8960_Write_Reg(0x30, 0x0009); //0x000D,0x0005
//if (res == 0) Serial.println("WM8960 Jack Detect"); else return res;
delay(delay1);
return 0;
}
/////////////////////////////////////////
// Setup
/////////////////////////////////////////
void setup()
{
uint8_t res;
pinMode(led, OUTPUT);
AudioMemory(12);
Wire.begin(); // join i2c bus (address optional for master)
//Serial.begin(9600);
res = WM89060_Init();
//if (res != 0) Serial.println(res);
}
/////////////////////////////////////////
// Main
/////////////////////////////////////////
void loop()
{
delay(100); // wait 5 seconds for next scan
}