Function audioOutLoop

modules/pins/i2s/audioout.c:1475–1689

#endif

void audioOutLoop(void *pvParameter)
{
	modAudioOut out = pvParameter;
	uint8_t stopped = true;

#if MODDEF_AUDIOOUT_I2S_PDM
    i2s_chan_config_t tx_chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(I2S_NUM_AUTO, I2S_ROLE_MASTER);
    tx_chan_cfg.auto_clear = true;

	i2s_pdm_tx_config_t tx_cfg = {
		.clk_cfg = I2S_PDM_TX_CLK_DEFAULT_CONFIG(out->sampleRate),
		.slot_cfg = I2S_PDM_TX_SLOT_DEFAULT_CONFIG(I2S_DATA_BIT_WIDTH_16BIT, I2S_SLOT_MODE_MONO),
		.gpio_cfg = {
			.clk = -1,
			.dout = MODDEF_AUDIOOUT_I2S_PDM_PIN,
			.invert_flags = {
				.clk_inv = false,
			},
		},
	};
	i2s_new_channel(&tx_chan_cfg, &out->tx_handle, NULL);
	i2s_channel_init_pdm_tx_mode(out->tx_handle, &tx_cfg);

#elif !MODDEF_AUDIOOUT_I2S_DAC
	// I2S_CHANNEL_DEFAULT_CONFIG(i2s_num, i2s_role)
	i2s_chan_config_t chan_cfg = {
		.id = MODDEF_AUDIOOUT_I2S_NUM,
		.role = I2S_ROLE_MASTER,
		.dma_desc_num = 2,
		.dma_frame_num = sizeof(out->buffer) / out->bytesPerFrame,
		.auto_clear = true,		// This is different from I2S_CHANNEL_DEFAULT_CONFIG
	};
	i2s_new_channel(&chan_cfg, &out->tx_handle, NULL);

	i2s_std_config_t i2s_config = {
		.gpio_cfg = {
			.mclk = I2S_GPIO_UNUSED,
			.bclk = MODDEF_AUDIOOUT_I2S_BCK_PIN,
			.ws = MODDEF_AUDIOOUT_I2S_LR_PIN,
			.dout = MODDEF_AUDIOOUT_I2S_DATAOUT_PIN,
			.din = I2S_GPIO_UNUSED,
			.invert_flags = {
				.mclk_inv = false,
				.bclk_inv = false,
				.ws_inv = false,
			},
		},
	};

	// I2S_STD_CLK_DEFAULT_CONFIG(sampleRate) (i2s_std.h)
	i2s_config.clk_cfg.sample_rate_hz = out->sampleRate;
	i2s_config.clk_cfg.clk_src = I2S_CLK_SRC_DEFAULT;
	i2s_config.clk_cfg.mclk_multiple = I2S_MCLK_MULTIPLE_256;

	// I2S_STD_MSB_SLOT_DEFAULT_CONFIG(bitwidth, mode) (i2s_std.h)
	int msb_right = true;
#if MODDEF_AUDIOOUT_I2S_BITSPERSAMPLE == 32
	i2s_config.slot_cfg.data_bit_width = I2S_DATA_BIT_WIDTH_16BIT;