ArdI2SOut.h

#include "ArdConfig.h"
#ifdef __I2S__
 
#ifndef ARDI2SOUT_H
#define ARDI2SOUT_H
 
#include "Stk.h"
#include "WvOut.h"
#include "ArdCommonOut.h"
#ifdef ESP32
#include "driver/i2s.h"
#endif
#ifdef ESP8266
#include "I2S.h"
#endif
 
#define SAMPLE_RATE     (36000)
#define I2S_NUM         (0)
#define I2S_BCK_IO      (GPIO_NUM_13)
#define I2S_WS_IO       (GPIO_NUM_15)
#define I2S_DO_IO       (GPIO_NUM_21)
#define I2S_DI_IO       (-1)
 
 
typedef int (*RtESPAudioCallback)( void *outputBuffer, 
                                unsigned int nFrames,
                                void *userData );
 
 static i2s_config_t default_i2s_config = {
    .mode = (i2s_mode_t) (I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN),
    .sample_rate = SAMPLE_RATE, // corrected by info from bluetooth
    .bits_per_sample = (i2s_bits_per_sample_t) sizeof(stk::StkFloat), 
    .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
    .communication_format = I2S_COMM_FORMAT_I2S_MSB,
    .intr_alloc_flags = 0, // default interrupt priority
    .dma_buf_count = 8,
    .dma_buf_len = 64,
    .use_apll = false
};
 
static i2s_pin_config_t default_pin_config = {
    .bck_io_num = I2S_BCK_IO,
    .ws_io_num = I2S_WS_IO,
    .data_out_num = I2S_DO_IO,
    .data_in_num = I2S_DI_IO                                              
};
 
namespace stk {
 
/***************************************************/
/***************************************************/
 
class ArdI2SOut: public ArdCommonOut {
    public:
        ArdI2SOut(unsigned channels=1, i2s_port_t i2s_number=(i2s_port_t)0);
        void begin();
        void setPinConfig(i2s_pin_config_t& pin_config);
        void setI2SConfig(i2s_config_t& i2s_config);
 
    protected:   
        int byteCount;
        i2s_config_t& i2s_config=default_i2s_config;
        i2s_pin_config_t& pin_config = default_pin_config;
        i2s_port_t i2s_number;
        bool active = false;
 
        virtual void write(StkFloat value) override;
        virtual void write(int16_t value) override;
 
};
 
}; //stk
#endif
#endif