Not Getting I2S Data.

RE: Not Getting I2S Data.

laksh — Wed, 07 Aug 2024 06:21:24 GMT

Hi,

I Managed to get the data but the thing is when i print the data with printk it throws a read error of -5. The error indicates -EIO. As I checked it is related to memory slab. Can anyone help me on this issue. Im Sharing the code here.

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

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;
		printk("%d\n", echo_block[i]);
	}
}

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;
}

int main(void)
{
	const struct device *const i2s_dev_rx = DEVICE_DT_GET(I2S_RX_NODE);
	struct i2s_config config;

	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;
	}

	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, block_size);

		k_mem_slab_free(&mem_slab, mem_block);

		printk("Loop: %d\n", loopCnt);
		loopCnt++;
	}
	printk("Exiting main loop\n");
	return 0;
}

Thanks in advance
Laksh

RE: Not Getting I2S Data.

laksh — Wed, 31 Jul 2024 05:07:30 GMT

In \zephyr\samples\drivers\i2s\echo\src\main.c project I made modifications to only init and get data. There is nothing much I did in that code. I have shared the code

[quote userid="134579" url="~/f/nordic-q-a/113509/not-getting-i2s-data"]I'm Sharing the code below[/quote]

Laksh

RE: Not Getting I2S Data.

Kenneth — Tue, 30 Jul 2024 12:42:17 GMT

Looking at the code it looks like you started with the \zephyr\samples\drivers\i2s\echo\src\main.c project, I suggest to revert back a bit, and provide a bit more information about what change caused it to fail to start with.

Kenneth

RE: Not Getting I2S Data.

laksh — Tue, 30 Jul 2024 08:50:26 GMT

Hi Turbo,

Can you elaborate a bit, so that I can proceed further. As you mentioned i cahnged the code

while (1) {
		ret = i2s_read(i2s_dev_rx, &mem_block, &block_size);
		if (ret < 0) {
			printk("Failed to read data: %d\n", ret);
		}
		else{
			printk("Read Data Success \n");
		}
		for (int i = 0; i < SAMPLES_PER_BLOCK; ++i) {
                        sampleData = ((int16_t *)mem_block)[i] >> 16;
						printk("data: %d\n", sampleData);
            }

		k_mem_slab_free(&mem_slab, mem_block);
	}

After this im getting the data as only 0 and -1 since Im using mic I know the data is wrong.

Also, When I checked the BCLK pin in oscillosocpe its not generating any clock signal.

Thanks

RE: Not Getting I2S Data.

Turbo J — Tue, 30 Jul 2024 06:56:49 GMT

Your code is missing the required k_mem_slab_free() call inside the while loop. The k_free() call is both wrong function and in the wrong place.