NRF5340 for audio reception

[Kashyap23]

Hi ,I am new to nrf .I am currently using nrf5340,so i want to just print raw data of sph0645 using zephyr.I tested with examples of echo but i didnt achieved to print raw data and i have defined pin specifications in overlay file.Please provide any source.

[Amanda Hsieh]

Hi, 

You can take a look at the functions i2s_read() which reads the data from Rx queue and i2s_buf_read() which reads the data from Rx queue into the buffer.

Regards,
Amanda H.

[Kashyap23]

I have used the same thing but I am getting return value of -5,when I checked with the corresponding error code ,It shows I/O error.I don't know why that error came as i mentioned pins correctly.I attached my overlay layer

&pinctrl {

i2s0_default_alt: i2s0_default_alt {

group1 {

psels = <NRF_PSEL(I2S_SCK_M, 0, 7)>,

<NRF_PSEL(I2S_LRCK_M, 0, 12)>,

<NRF_PSEL(I2S_SDIN, 1, 0)>;

//<NRF_PSEL(I2S_SDOUT, 1, 0)>;

};

};

};

&clock {

hfclkaudio-frequency = <11289600>;

};

i2s_rxtx: &i2s0 {

status = "okay";

pinctrl-0 = <&i2s0_default_alt>;

pinctrl-names = "default";

clock-source = "ACLK";

};

[Kashyap23]

#include <zephyr/kernel.h>

#include <zephyr/device.h>

#include <zephyr/drivers/i2s.h>

#if DT_NODE_EXISTS(DT_NODELABEL(i2s_rxtx))

#define I2S_RX_NODE DT_NODELABEL(i2s_rxtx)

#define I2S_TX_NODE I2S_RX_NODE

#endif

#define AUDIO_BUFFER_SIZE 1024

uint8_t audio_buffer[AUDIO_BUFFER_SIZE];

#define SAMPLE_FREQUENCY 44100

#define SAMPLE_BIT_WIDTH 24

#define BYTES_PER_SAMPLE sizeof(int32_t)

#define NUMBER_OF_CHANNELS 1

static const struct device *mic = DEVICE_DT_GET(I2S_RX_NODE);

void print_raw_data(void) {

struct i2s_config cfg = {

.word_size = SAMPLE_BIT_WIDTH,

.channels = NUMBER_OF_CHANNELS,

.format = I2S_FMT_DATA_FORMAT_I2S,

.options = I2S_OPT_LOOPBACK,

};

int ret = i2s_configure(mic, I2S_DIR_RX, &cfg);

printk("%d",ret);

if (ret > 0) {

printk("Failed to configure I2S: %d\n", ret);

return;

}

while (1) {

ret = i2s_read(mic, audio_buffer, AUDIO_BUFFER_SIZE);

if (ret >= 0) {

printk("Raw data:\n");

for (size_t i = 0; i < AUDIO_BUFFER_SIZE; i++) {

printk("%02X ", audio_buffer[i]);

}

printk("\n");

} else {

printk("Failed to read from mic: %d\n", ret);

break;

}

}

}

void main(void) {

if (!device_is_ready(mic)) {

printk("Microphone device is not supported : %s\n", mic->name);

return;

}

print_raw_data();

}

 

And this is source code I just tested for.

[Amanda Hsieh]

Kashyap23 said:

I am getting return value of -5,when I checked with the corresponding error code ,It shows I/O error.

• -EIO  means The interface is in NOT_READY or ERROR state and there are no more data blocks in the RX queue.

Kashyap23 said:

<NRF_PSEL(I2S_LRCK_M, 0, 12)>,

Use other pins since P0.12 is for Trace, SPIM4. See the pin used in the nrf5340dk_nrf5340_cpuapp.overlay as an example.