Use philips format.

1 files changed, 89 insertions, 0 deletions

diff --git a/main/main.c b/main/main.c
new file mode 100644
index 0000000..e0f3e05
--- /dev/null
+++ b/main/main.c
@@ -0,0 +1,89 @@
+#include <freertos/FreeRTOS.h>
+#include <freertos/task.h>
+
+#include <esp_log.h>
+#include <esp_event.h>
+#include <esp_netif.h>
+#include <nvs_flash.h>
+
+#include <driver/gpio.h>
+#include <driver/i2s_std.h>
+
+#include "wifi.h"
+
+#define BUFLEN      1024
+#define SAMP_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 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) {
+				// todo: copy to a separate buffer and send over udp
+				// esp_mqtt_client_publish(client, "snd", buf, n, 1, 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));
+}
+
+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);
+
+	for (;;)
+		vTaskDelay(500 / portTICK_PERIOD_MS);
+}
+