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main.c
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main.c
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/*
* Copyright (c) 2018 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <zephyr/kernel.h>
#include <zephyr/sys/printk.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/led.h>
#include <zephyr/audio/dmic.h>
/* uncomment if you want PCM output in ascii */
/*#define PCM_OUTPUT_IN_ASCII 1 */
#define AUDIO_FREQ 16000
#define CHAN_SIZE 16
#define PCM_BLK_SIZE_MS ((AUDIO_FREQ/1000) * sizeof(int16_t))
#define NUM_MS 5000
K_MEM_SLAB_DEFINE(rx_mem_slab, PCM_BLK_SIZE_MS, NUM_MS, 1);
struct pcm_stream_cfg mic_streams = {
.pcm_rate = AUDIO_FREQ,
.pcm_width = CHAN_SIZE,
.block_size = PCM_BLK_SIZE_MS,
.mem_slab = &rx_mem_slab,
};
struct dmic_cfg cfg = {
.io = {
/* requesting a pdm freq around 2MHz */
.min_pdm_clk_freq = 1800000,
.max_pdm_clk_freq = 2500000,
},
.streams = &mic_streams,
.channel = {
.req_num_chan = 1,
},
};
#define NUM_LEDS 12
#define DELAY_TIME K_MSEC(25)
static const struct gpio_dt_spec led0 = GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
static const struct gpio_dt_spec led1 = GPIO_DT_SPEC_GET(DT_ALIAS(led1), gpios);
void signal_sampling_started(void)
{
gpio_pin_configure_dt(&led0, GPIO_OUTPUT_ACTIVE);
gpio_pin_configure_dt(&led1, GPIO_OUTPUT_INACTIVE);
}
void signal_sampling_stopped(void)
{
gpio_pin_configure_dt(&led0, GPIO_OUTPUT_ACTIVE);
gpio_pin_configure_dt(&led1, GPIO_OUTPUT_ACTIVE);
}
void signal_print_stopped(void)
{
gpio_pin_configure_dt(&led0, GPIO_OUTPUT_INACTIVE);
gpio_pin_configure_dt(&led1, GPIO_OUTPUT_ACTIVE);
}
void *rx_block[NUM_MS];
size_t rx_size = PCM_BLK_SIZE_MS;
int main(void)
{
int i;
uint32_t ms;
if (!gpio_is_ready_dt(&led0)) {
printk("LED0 GPIO controller device is not ready\n");
return 0;
}
if (!gpio_is_ready_dt(&led1)) {
printk("LED1 GPIO controller device is not ready\n");
return 0;
}
#ifdef CONFIG_LP3943
static const struct device *const ledc = DEVICE_DT_GET_ONE(ti_lp3943);
if (!device_is_ready(ledc)) {
printk("Device %s is not ready\n", ledc->name);
return 0;
}
/* turn all leds on */
for (i = 0; i < NUM_LEDS; i++) {
led_on(ledc, i);
k_sleep(DELAY_TIME);
}
/* turn all leds off */
for (i = 0; i < NUM_LEDS; i++) {
led_off(ledc, i);
k_sleep(DELAY_TIME);
}
#endif
printk("ArgonKey test!!\n");
int ret;
const struct device *const mic_dev = DEVICE_DT_GET_ONE(st_mpxxdtyy);
if (!device_is_ready(mic_dev)) {
printk("Device %s is not ready\n", mic_dev->name);
return 0;
}
ret = dmic_configure(mic_dev, &cfg);
if (ret < 0) {
printk("microphone configuration error\n");
return 0;
}
ret = dmic_trigger(mic_dev, DMIC_TRIGGER_START);
if (ret < 0) {
printk("microphone start trigger error\n");
return 0;
}
signal_sampling_started();
/* Acquire microphone audio */
for (ms = 0U; ms < NUM_MS; ms++) {
ret = dmic_read(mic_dev, 0, &rx_block[ms], &rx_size, 2000);
if (ret < 0) {
printk("microphone audio read error\n");
return 0;
}
}
signal_sampling_stopped();
ret = dmic_trigger(mic_dev, DMIC_TRIGGER_STOP);
if (ret < 0) {
printk("microphone stop trigger error\n");
return 0;
}
/* print PCM stream */
#ifdef PCM_OUTPUT_IN_ASCII
printk("-- start\n");
int j;
for (i = 0; i < NUM_MS; i++) {
uint16_t *pcm_out = rx_block[i];
for (j = 0; j < rx_size/2; j++) {
printk("0x%04x,\n", pcm_out[j]);
}
}
printk("-- end\n");
#else
unsigned char pcm_l, pcm_h;
int j;
for (i = 0; i < NUM_MS; i++) {
uint16_t *pcm_out = rx_block[i];
for (j = 0; j < rx_size/2; j++) {
pcm_l = (char)(pcm_out[j] & 0xFF);
pcm_h = (char)((pcm_out[j] >> 8) & 0xFF);
z_impl_k_str_out(&pcm_l, 1);
z_impl_k_str_out(&pcm_h, 1);
}
}
#endif
signal_print_stopped();
return 0;
}