Hi all,
I'm using an nRF5340 DK and I want to build a simple project that plays a sinewave to an i2s DAC (MAX 98357A, perfectly working on other development boards I have).
Being new to the nRF platform, I used the i2s_echo sample and some code found on the Internet, and I think all the information match. However, I always get stuck with a code that runs but returns -5 (EIO) at the i2s_write command
This is the code I'm using
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <soc.h>
#include <string.h>
#include <nrf.h>
#include <zephyr/drivers/i2s.h>
/* Prepare for 32 sample values */
#define NUM_SAMPLES 32
/* Sine Wave Sample */
static int16_t data_frame[NUM_SAMPLES] = {
6392, 12539, 18204, 23169, 27244, 30272, 32137, 32767, 32137,
30272, 27244, 23169, 18204, 12539, 6392, 0, -6393, -12540,
-18205, -23170, -27245, -30273, -32138, -32767, -32138, -30273, -27245,
-23170, -18205, -12540, -6393, -1,
};
/* The size of the memory block should be a multiple of data_frame size */
#define BLOCK_SIZE (2 * sizeof(data_frame))
/* The number of memory blocks in a slab has to be at least 2 per queue */
#define NUM_BLOCKS 5
/* Define a new Memory Slab which consistes of NUM_BLOCKS blocks
__________________________________________________________________________
| Block 0 | Block 1 | Block 2 | Block 3 | Block 4 |
| 0...31 | 0...31 | 0...31 | 0...31 | 0...31 |
|______________|______________|______________|______________|______________|
*/
static K_MEM_SLAB_DEFINE(mem_slab, BLOCK_SIZE, NUM_BLOCKS, NUM_SAMPLES);
void main(void) {
/* Get I2S device from the devicetree */
const struct device *i2s_dev = DEVICE_DT_GET(DT_NODELABEL(i2s_rxtx));
printk("Allocating i2s device \n");
if (!device_is_ready(i2s_dev)) {
printk("%s is not ready\n", i2s_dev->name);
return;
}
/* Configure the I2S device */
struct i2s_config i2s_cfg;
i2s_cfg.word_size = 16; // due to int16_t in data_frame declaration
i2s_cfg.channels = 2; // L + R channel
i2s_cfg.format = I2S_FMT_DATA_FORMAT_I2S;
i2s_cfg.options = I2S_OPT_BIT_CLK_MASTER | I2S_OPT_FRAME_CLK_MASTER;
i2s_cfg.frame_clk_freq = 44100;
i2s_cfg.mem_slab = &mem_slab;
i2s_cfg.block_size = BLOCK_SIZE;
i2s_cfg.timeout = 1000;
int ret = i2s_configure(i2s_dev, I2S_DIR_TX, &i2s_cfg);
if (ret < 0) {
printk("Failed to configure the I2S stream: (%d)\n", ret);
return;
}
/* Allocate the memory blocks (tx buffer) from the slab and
set everything to 0 */
void *mem_blocks;
ret = k_mem_slab_alloc(&mem_slab, &mem_blocks, K_NO_WAIT);
if (ret < 0) {
printk("Failed to allocate the memory blocks: %d\n", ret);
return;
}
memset((uint16_t*)mem_blocks, 0, NUM_SAMPLES * NUM_BLOCKS);
/* Start the transmission of data */
printk("Starting transmission \n");
ret = i2s_trigger(i2s_dev, I2S_DIR_TX, I2S_TRIGGER_START);
if (ret < 0) {
printk("Failed to start the transmission: %d\n", ret);
return;
}
for(;;) {
/*for (int i=0; i < 10; i++) {*/
int ret;
/* Put data into the tx buffer */
for (int i = 0; i < NUM_SAMPLES * NUM_BLOCKS; i++) {
((uint16_t*)mem_blocks)[i] = data_frame[i % NUM_SAMPLES];
}
/* Write Data */
printk("Playing.. \n");
ret = i2s_write(i2s_dev, mem_blocks, BLOCK_SIZE);
if (ret < 0) {
printk("Error: i2s_write failed with %d\n", ret);
return;
}
ret = i2s_trigger(i2s_dev, I2S_DIR_TX, I2S_TRIGGER_STOP);
if (ret < 0) {
printk("Failed to stop the transmission: %d\n", ret);
return;
}
/*}*/
}
}
This is my overlay:
&pinctrl {
compatible = "nordic,nrf-pinctrl";
i2c0_default_alt: i2c0_default_alt {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 0, 25)>,
<NRF_PSEL(TWIM_SCL, 0, 26)>;
};
};
i2c0_sleep_alt: i2c0_sleep_alt {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 0, 25)>,
<NRF_PSEL(TWIM_SCL, 0, 26)>;
low-power-enable;
};
};
i2s0_default_alt: i2s0_default_alt {
group1 {
psels = <NRF_PSEL(I2S_SCK_M, 1, 15)>,
<NRF_PSEL(I2S_LRCK_M, 1, 12)>,
<NRF_PSEL(I2S_SDOUT, 1, 13)>,
<NRF_PSEL(I2S_SDIN, 1, 14)>;
};
};
};
&clock {
hfclkaudio-frequency = <11289600>;
};
spi: &spi4 {
status = "disabled";
};
i2s_rxtx: &i2s0 {
status = "okay";
pinctrl-0 = <&i2s0_default_alt>;
pinctrl-names = "default";
clock-source = "ACLK";
};
i2s in the generated zephyr.dts checks fine (status is "okay")
How can I get past this error?
Thanks in advance
