how to enable MCLK pin in NCS1.9.1 for I2S?

[yoyou]

hello,

NCS1.9.1,  Windows10 X64,nRF5340-DK,nrfx_i2s

in file boards\nrf5340dk_nrf5340_cpuapp.overlay

   

i've i2s DAC model ,it must use 4 line(MCLK,SCLK,SDIN,LRCK)

but default config no MCLK pin set,i add mck-pin,it not work.

how to enable MCLK pin?

 

thanks

Best Regards

[Øivind]

Hi,

Could I see your prj.conf file, and how you are enabling the i2s peripheral in your code?

[yoyou]

Hello,

thanks for reply,  the file prj.conf

i add [mck-pin = <0x26>;] to file boards\nrf5340dk_nrf5340_cpuapp.overlay

i2s is master mode,i do't know how to enable MCLK.

nrfx_err_t I2S_AUDIO_init()
{
	IRQ_DIRECT_CONNECT(I2S0_IRQn, 0, i2s_isr_handler, 0);
	memset(&m_buffer_tx32u, 0x00, sizeof(m_buffer_tx32u));
	memset(&m_buffer_rx32u, 0x00, sizeof(m_buffer_rx32u));
	initial_buffers.p_tx_buffer = m_buffer_tx32u;
	initial_buffers.p_rx_buffer = m_buffer_rx32u;

	//YOu should probably change this config to fit your I2S microphone and audio preferences.
	nrfx_i2s_config_t config =NRFX_I2S_DEFAULT_CONFIG(I2S_SCK_PIN, I2S_LRCK_PIN,
								NRFX_I2S_PIN_NOT_USED,I2S_SDOUT_PIN, I2S_SDIN_PIN);

	config.mode = NRF_I2S_MODE_MASTER;			
	config.ratio = NRF_I2S_RATIO_96X;			
	config.sample_width = NRF_I2S_SWIDTH_16BIT; 
	config.mck_setup = NRF_I2S_MCK_32MDIV21;	//Preference     freq = (MCKfreq/ratio) =16.129 KHz.
	config.channels = NRF_I2S_CHANNELS_LEFT;	

	nrfx_err_t err_code = nrfx_i2s_init(&config, data_handler);
	if (err_code != NRFX_SUCCESS)
	{
		printk("I2S init error\n");
		return err_code;
	}
	err_code = nrfx_i2s_start(&initial_buffers, I2S_DATA_BLOCK_WORDS, 0); //start recording
	if (err_code != NRFX_SUCCESS)
	{
		printk("I2S start error\n");
		return err_code;
	}
	//nrfx_i2s_stop()

	k_sleep(K_SECONDS(2));
	return err_code;
}

  

thanks

Best Regards

[Øivind]

	nrfx_i2s_config_t config =NRFX_I2S_DEFAULT_CONFIG(I2S_SCK_PIN, I2S_LRCK_PIN,
								NRFX_I2S_PIN_NOT_USED,I2S_SDOUT_PIN, I2S_SDIN_PIN);

Here you need to replace NRFX_I2S_PIN_NOT_USED with the MCK pin. If you don't already have a I2S_MCK_PIN, just define it the same way for example I2S_SCK_PIN is defined.

[yoyou]

Hello,

thanks a lot, i'm sorry,

how could I not have noticed this line!

Best Regards