I am trying to get I2S communication up and running but am unable to produce a signal on my SDOUT pin. MCLK, LRCLK and SCLK work as intended but trying to send any data does not work. I did notice that the TXD.PTR register is empty. I have tried multiple pins for my SDOUT and have nrf SDK 1.8.0 installed, using VScode. Any help would be appreciated.
#include <zephyr.h>
#include <drivers/gpio.h>
#include <init.h>
#include <nrf.h>
#include <nrfx.h>
#include <nrfx_gpiote.h>
#include <drivers/i2s.h>
#include "nrfx_i2s.h"
#include <errno.h>
#include <string.h>
#include <logging/log.h>
LOG_MODULE_REGISTER(Main);
#define AUDIO_SAMPLE_FREQ (44100)
#define AUDIO_NUM_CHANNELS (1)
#define AUDIO_SAMPLE_BIT_WIDTH (16)
#define AUDIO_SAMPLES_PER_CH_PER_FRAME (128)
#define AUDIO_SAMPLES_PER_FRAME (AUDIO_SAMPLES_PER_CH_PER_FRAME * AUDIO_NUM_CHANNELS)
#define AUDIO_SAMPLE_BYTES (sizeof(uint16_t))
#define AUDIO_FRAME_BUF_BYTES (AUDIO_SAMPLES_PER_FRAME * AUDIO_SAMPLE_BYTES)
#define I2S_PLAY_BUF_COUNT (500)
static const struct device *host_i2s_tx_dev;
static struct k_mem_slab i2s_tx_mem_slab;
static char tx_buffer[AUDIO_FRAME_BUF_BYTES * I2S_PLAY_BUF_COUNT];
static struct i2s_config config;
volatile int ret;
static void init(void)
{
/*configure tx device*/
host_i2s_tx_dev = device_get_binding("I2S_0");
k_mem_slab_init(&i2s_tx_mem_slab, tx_buffer, AUDIO_FRAME_BUF_BYTES, I2S_PLAY_BUF_COUNT);
/* configure i2s for audio playback */
config.word_size = AUDIO_SAMPLE_BIT_WIDTH;
config.channels = AUDIO_NUM_CHANNELS;
config.format = I2S_FMT_DATA_FORMAT_I2S;
config.options = (I2S_OPT_BIT_CLK_MASTER | I2S_OPT_FRAME_CLK_MASTER);
config.frame_clk_freq = AUDIO_SAMPLE_FREQ;
config.block_size = AUDIO_FRAME_BUF_BYTES;
config.mem_slab = &i2s_tx_mem_slab;
config.timeout = -1;
ret = i2s_configure(host_i2s_tx_dev, I2S_DIR_TX, &config);
if (ret < 0)
{
LOG_INF("tx config:%d", ret);
}
}
void main(void)
{
init();
uint16_t buf[128];
volatile size_t size = sizeof(buf);
int i = 0;
for (i = 0; i < size; i++)
{
if (i <= size / 4)
{
buf[i] = i;
}
else if (i > size / 4)
{
buf[i] = size / 2 - i;
}
}
void *tx_mem_block;
ret = i2s_trigger(host_i2s_tx_dev, I2S_DIR_TX, I2S_TRIGGER_START);
while (1)
{
ret = k_mem_slab_alloc(&i2s_tx_mem_slab, &tx_mem_block, K_NO_WAIT);
memcpy(tx_mem_block, &buf, size);
ret = i2s_write(host_i2s_tx_dev, tx_mem_block, size);
k_mem_slab_free(&i2s_tx_mem_slab, &tx_mem_block);
}
}# CONFIG_MULTITHREADING=n # CONFIG_KERNEL_MEM_POOL=n # CONFIG_NUM_PREEMPT_PRIORITIES=0 # CONFIG_SYS_CLOCK_EXISTS=n # CONFIG_ARM_MPU=n # CONFIG_SIZE_OPTIMIZATIONS=y CONFIG_I2S=y CONFIG_NRFX_I2S=y # CONFIG_WATCHDOG=n CONFIG_GPIO=y # CONFIG_PINMUX=n # CONFIG_SPI=n # CONFIG_SERIAL=n # CONFIG_FLASH=n # CONFIG_PM=n # CONFIG_DYNAMIC_INTERRUPTS=n # CONFIG_IRQ_OFFLOAD=n # CONFIG_THREAD_STACK_INFO=n # CONFIG_THREAD_CUSTOM_DATA=n # CONFIG_BOOT_BANNER=n # CONFIG_BOOT_DELAY=0 # CONFIG_CONSOLE=n # CONFIG_UART_CONSOLE=n # CONFIG_STDOUT_CONSOLE=n # CONFIG_EARLY_CONSOLE=n CONFIG_BOARD_ENABLE_CPUNET=n CONFIG_NRF_RTC_TIMER=n CONFIG_CORTEX_M_SYSTICK=y CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=64000000 CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000000 CONFIG_LOG=y CONFIG_USE_SEGGER_RTT=y CONFIG_LOG_BACKEND_RTT=y
