UART flooded with messages

[jenya7]

The code

Code: Select all

void app_main()
{
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
    {
	     ESP_ERROR_CHECK(nvs_flash_erase());
	     ret = nvs_flash_init();
	}
	ESP_ERROR_CHECK(ret);

	esp_log_level_set("*", ESP_LOG_NONE);

	GPIO_Init();

	UART_Setup();
	UART_PrintString("UART setup done.\n");

	while (1)
	{

	}
}

After burning a bin and connecting to UART I constantly get messages like

rs?:0x10 (RT?WDT_RTC_R?SET),boot:0x1? (?PI_FAS?_FLASH_BO?T)
fl?sh rea? e?r, 1000
?ts_mai?.c 371
ets Ju? 8 2016 00:22:57

rs?:0x10 (RTCWDT?RTC_RE?ET),boot:0x1b (S?I_FAST?FLASH_?OO?)
fla?h read er?, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_?ES?T),boot:0x1b (SPI_FAST_FLASH_B?OT)
?la?h ?ea? e?r, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57

What is the problem?