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#include <string.h>
#include <sys/param.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <esp_event.h>
#include <esp_log.h>
#include <esp_netif.h>
#include <esp_system.h>
#include <nvs_flash.h>
#include <driver/gpio.h>
#include <driver/i2s_std.h>
#include <lwip/err.h>
#include <lwip/sockets.h>
#include <lwip/sys.h>
#include <lwip/netdb.h>
#include "wifi.h"
#define BUFLEN 1024
#define SAMPLE_RATE 8000
#define I2S_WS GPIO_NUM_4
#define I2S_SD GPIO_NUM_1
#define I2S_SCK GPIO_NUM_5
static i2s_chan_handle_t chan;
static char *data = calloc(1, BUFLEN + 1);
static void i2s_read_task(void *args)
{
size_t n;
char *buf = calloc(1, BUFLEN);
ESP_ERROR_CHECK(i2s_channel_enable(chan));
for (;;) {
if (i2s_channel_read(chan, buf, BUFLEN, &n, 1000) == ESP_OK) {
if (n > 0) {
memcpy(data, buf, n);
data[n] = '\0';
}
} else
printf("Read Task: i2s read failed\n");
}
free(buf);
vTaskDelete(NULL);
}
static inline void i2s_init(void)
{
i2s_chan_config_t chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(
I2S_NUM_AUTO, I2S_ROLE_MASTER);
ESP_ERROR_CHECK(i2s_new_channel(&chan_cfg, NULL, &chan));
i2s_std_config_t std_cfg = {
.clk_cfg = I2S_STD_CLK_DEFAULT_CONFIG(SAMP_RATE),
.slot_cfg = I2S_STD_PHILIPS_SLOT_DEFAULT_CONFIG(
I2S_DATA_BIT_WIDTH_24BIT, I2S_SLOT_MODE_MONO),
.gpio_cfg = {
.ws = I2S_WS,
.din = I2S_SD,
.bclk = I2S_SCK,
.dout = I2S_GPIO_UNUSED,
.mclk = I2S_GPIO_UNUSED,
.invert_flags = {
.ws_inv = false,
.bclk_inv = false,
.mclk_inv = false
}
}
};
std_cfg.clk_cfg.mclk_multiple = I2S_MCLK_MULTIPLE_384;
ESP_ERROR_CHECK(i2s_channel_init_std_mode(chan, &std_cfg));
}
static void udp_send_task(void *args)
{
const int family = AF_INET;
const int port = CONFIG_UDP_PORT;
const char[] ip_addr = CONFIG_UDP_ADDR;
int sock;
struct timeval timeout;
struct sockaddr_in addr;
addr_family = AF_INET;
dest_addr.sin_addr.s_addr = inet_addr(ip_addr);
dest_addr.sin_family = family;
dest_addr.sin_port = htons(port);
int sock = socket(family, SOCK_DGRAM, IPPROTO_IP);
if (sock < 0) {
ESP_LOGE(TAG, "Unable to create socket: errno %d", errno);
break;
}
timeout.tv_sec = 10;
timeout.tv_usec = 0;
setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof timeout);
ESP_LOGI(TAG, "Socket created, sending to %s:%d", ip_addr, port);
for (;;) {
int err = sendto(sock, data, strlen(data), 0,
(struct sockaddr *)&addr, sizeof addr);
if (err < 0) {
ESP_LOGE(TAG, "Error occurred during sending: errno %d", errno);
break;
}
if (sock != -1) {
ESP_LOGE(TAG, "Shutting down socket and restarting...");
shutdown(sock, 0);
close(sock);
}
}
vTaskDelete(NULL);
}
void app_main(void)
{
ESP_ERROR_CHECK(nvs_flash_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
wifi_connect();
i2s_init();
xTaskCreate(i2s_read_task, "i2s_read_task", 4096, NULL, 5, NULL);
xTaskCreate(udp_send_task, "udp_send_task", 4096, NULL, 5, NULL);
for (;;)
vTaskDelay(500 / portTICK_PERIOD_MS);
}
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