RE: SPH0645 I2S MIC DATA FORMAT

Elfving — Fri, 25 Oct 2024 08:22:49 GMT

Great to see that you've gotten further and also shared this solution Kashyap.

[quote user="Kashyap23"]But I dont know what size can I give in that.[/quote]

I am not sure if I understand the problem, but CONFIG_SEGGER_RTT_BUFFER_SIZE_UP doesn't seem to have a max but several samples increase it from the default 1024 to 4096. CONFIG_LOG_BUFFER_SIZE is often increased to 4096 as well.

Maybe it seems practical at the moment, though logging every single measurement doesn't seem necessary in a final application to me. So I guess this isn't a big issue either way, no matter what you increase it to for the time being.

Regards,

Elfving

RE: SPH0645 I2S MIC DATA FORMAT

Kashyap23 — Thu, 24 Oct 2024 01:54:36 GMT

Hi,I able to solve the issue ,the main thing is by logging data by RTT the buffer size is very low 1024 which is default once I increased size it works this is done by increasing CONFIG_SEGGER_RTT_BUFFER_SIZE_UP,CONFIG_LOG_BUFFER_SIZE

CONFIG_LOG_MODE_OVERFLOW=n

CONFIG_SEGGER_RTT_BUFFER_SIZE_UP=1024

CONFIG_LOG_BUFFER_SIZE=1024

CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=2048

But I dont know what size can I give in that.I increased it randomly by keeping 50k my sampling rate is 16k and each sample 16bits .Can you help me what size do I need to define correctly.

RE: SPH0645 I2S MIC DATA FORMAT

Kashyap23 — Mon, 21 Oct 2024 12:23:06 GMT

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&pinctrl {
i2s0_default: i2s0_default {
group1 {
psels = <NRF_PSEL(I2S_SCK_M, 0, 26)>,
<NRF_PSEL(I2S_LRCK_M, 0, 25)>,
<NRF_PSEL(I2S_SDIN, 0, 7)>,
<NRF_PSEL(I2S_SDOUT, 0, 6)>;
};
};
i2s0_sleep: i2s0_sleep {
group1 {
psels = <NRF_PSEL(I2S_SCK_M, 0, 26)>,
<NRF_PSEL(I2S_LRCK_M, 0, 25)>,
<NRF_PSEL(I2S_SDIN, 0, 7)>,
<NRF_PSEL(I2S_SDOUT, 0, 6)>;
};
};
};

&clock {
status = "okay";
hfclkaudio-frequency = <12288000>;
};


i2s_rxtx: &i2s0 {
status = "okay";
pinctrl-0 = <&i2s0_default>;
pinctrl-1 = <&i2s0_sleep>;
clock-source = "ACLK";
pinctrl-names = "default","sleep";
};

Ok,In that case help me with getting data as I am not able to get mic data correctly.Here I am just reading and logging manually and using that i iam converting to wav file externally to check audio.But using this I am not getting all data,some data is not printing and dont know it is correct data or not

#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>
#include <zephyr/drivers/i2s.h>
#include <zephyr/drivers/gpio.h>
#include <string.h>
#include <zephyr/drivers/uart.h>

#define I2S_RX_NODE DT_NODELABEL(i2s_rxtx)

#define SAMPLE_FREQUENCY 16000
#define SAMPLE_BIT_WIDTH 32
#define BYTES_PER_SAMPLE sizeof(int16_t)
#define NUMBER_OF_CHANNELS 1
#define SAMPLES_PER_BLOCK ((SAMPLE_FREQUENCY / 10) * NUMBER_OF_CHANNELS)
#define INITIAL_BLOCKS 2
#define TIMEOUT 1000

#define BLOCK_SIZE (BYTES_PER_SAMPLE * SAMPLES_PER_BLOCK)
#define BLOCK_COUNT (INITIAL_BLOCKS + 2)
K_MEM_SLAB_DEFINE_STATIC(mem_slab, BLOCK_SIZE, BLOCK_COUNT, 4);

const struct device *const i2s_dev_rx = DEVICE_DT_GET(I2S_RX_NODE);
struct i2s_config config;

static int16_t echo_block[SAMPLES_PER_BLOCK];
uint8_t loopCnt = 0;

static void process_block_data(void *mem_block, uint32_t number_of_samples)
{
	for (int i = 0; i < number_of_samples; ++i)
	{
		int16_t *sample = &((int16_t *)mem_block)[i];
		echo_block[i] = *sample;
	  }
	 
}

static bool configure_streams(const struct device *i2s_dev_rx, const struct i2s_config *config)
{
	int ret = i2s_configure(i2s_dev_rx, I2S_DIR_RX, config);
	if (ret == 0)
	{
		printk("Configure Stream Successful.\n");
		return true;
	}
	printk("Failed to configure streams: %d\n", ret);
	return false;
}

static bool trigger_command(const struct device *i2s_dev_rx, enum i2s_trigger_cmd cmd)
{
	int ret = i2s_trigger(i2s_dev_rx, I2S_DIR_RX, cmd);
	if (ret == 0)
	{
		printk("Trigger Command Successful.\n");
		return true;
	}
	printk("Failed to trigger command %d: %d\n", cmd, ret);
	return false;
}

static void i2sStreamInit(void){

	printk("I2S echo sample\n");

	if (!device_is_ready(i2s_dev_rx))
	{
		printk("%s is not ready\n", i2s_dev_rx->name);
		return 0;
	}

	config.word_size = SAMPLE_BIT_WIDTH;
	config.channels = NUMBER_OF_CHANNELS;
	config.format = I2S_FMT_DATA_FORMAT_I2S;
	config.options = I2S_OPT_BIT_CLK_MASTER | I2S_OPT_FRAME_CLK_MASTER;
	config.frame_clk_freq = SAMPLE_FREQUENCY;
	config.mem_slab = &mem_slab;
	config.block_size = BLOCK_SIZE;
	config.timeout = TIMEOUT;

	if (!configure_streams(i2s_dev_rx, &config))
	{
		return 0;
	}

	if (!trigger_command(i2s_dev_rx, I2S_TRIGGER_START))
	{
		return 0;
	}
}



int main(void)
{
	i2sStreamInit();
	printk("Streams started\n");

	while (1)
	{
		void *mem_block;
		uint32_t block_size;
		int ret;

		ret = i2s_read(i2s_dev_rx, &mem_block, &block_size);
		if (ret < 0)
		{
			printk("Failed to read data: %d\n", ret);
			break;
		}

		process_block_data(mem_block, SAMPLES_PER_BLOCK);
		k_mem_slab_free(&mem_slab, mem_block);

	}
	printk("Exiting main loop\n");
	return 0;
}

RE: SPH0645 I2S MIC DATA FORMAT

Elfving — Mon, 21 Oct 2024 10:34:54 GMT

[quote user="Kashyap23"]Can I use directly what I get without converting 2's complement value?[/quote]

That should be fine, 2's complement is normal.

Regards,

Elfving

RE: SPH0645 I2S MIC DATA FORMAT

Kashyap23 — Thu, 17 Oct 2024 03:09:14 GMT

[quote userid="134881" url="~/f/nordic-q-a/115390/sph0645-i2s-mic-data-format"]data of 2's complement value in order to get original mic data or it will be internally converted by the nrf5340 controller[/quote]

Ok,thank's for that .I have doubt regard data ,I am trying to print data and convert to wav file,in this case do i need any conversion of 2's complement value to get original audio or this wont be necessary thing.Can I use directly what I get without converting 2's complement value?

RE: SPH0645 I2S MIC DATA FORMAT

Elfving — Wed, 16 Oct 2024 14:15:55 GMT

Understood.

[quote user=""]The Data Format is I2S, 24-bit, 2’s compliment, MSB first. The data precision is 18 bits; unused bits are zeros".[/quote]

The data looks fine. The i2s should support all of that, and 24-bits. If you want to use LE Audio however, I believe that the LC3 codec only uses 16 bits at the moment, but that is not a real problem.

For more on i2s on the 5340, see here.

Regards,

Elfving

RE: SPH0645 I2S MIC DATA FORMAT

Kashyap23 — Tue, 15 Oct 2024 06:04:35 GMT

That's related to a different thing but here it's regarding the data format .I want to know how data is available using nrf5340.Can we use data directly?or we need to conert back from 2's complement.

RE: SPH0645 I2S MIC DATA FORMAT

Elfving — Fri, 11 Oct 2024 12:35:15 GMT

Hello Kashyap,

I see that the last case you've opened was a bit similar to this one, and it was recently answered as well. I assume this is somewhat of a duplicate then.

Regards,

Elfving