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examples/protocols/sntp: use common network component

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This commit is contained in:
Ivan Grokhotkov 2018-11-21 00:41:31 +08:00 committed by bot
parent 28cf1c83df
commit e0f3f62cdf
5 changed files with 26 additions and 83 deletions
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4
examples/protocols/sntp/CMakeLists.txt
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@ -2,5 +2,9 @@
# in this exact order for cmake to work correctly
cmake_minimum_required(VERSION 3.5)
# (Not part of the boilerplate)
# This example uses an extra component for common functions such as Wi-Fi and Ethernet connection.
set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(sntp)

2
examples/protocols/sntp/Makefile
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@ -5,5 +5,7 @@
PROJECT_NAME := sntp
EXTRA_COMPONENT_DIRS = $(IDF_PATH)/examples/common_components/protocol_examples_common
include $(IDF_PATH)/make/project.mk

8
examples/protocols/sntp/README.md
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@ -2,6 +2,14 @@
This example demonstrates the use of LwIP SNTP module to obtain time from Internet servers. See the README.md file in the upper level 'examples' directory for more information about examples.
## Configuring the Example
To configure the project, run `make menuconfig` (or `idf.py menuconfig` if using CMake build system).
* Configure Wi-Fi or Ethernet under "Example Connection Configuration" menu. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../README.md) for more details.
* When using Make build system, set `Default serial port` under `Serial flasher config`.
## Obtaining time using LwIP SNTP module
When this example boots first time after ESP32 is reset, it connects to WiFi and obtains time using SNTP.

17
examples/protocols/sntp/main/Kconfig.projbuild
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@ -1,17 +0,0 @@
menu "Example Configuration"
config WIFI_SSID
string "WiFi SSID"
default "myssid"
help
SSID (network name) for the example to connect to.
config WIFI_PASSWORD
string "WiFi Password"
default "mypassword"
help
WiFi password (WPA or WPA2) for the example to use.
Can be left blank if the network has no security set.
endmenu

78
examples/protocols/sntp/main/sntp_example_main.c
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@ -13,33 +13,16 @@
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event_loop.h"
#include "esp_event.h"
#include "esp_log.h"
#include "esp_attr.h"
#include "esp_sleep.h"
#include "nvs_flash.h"
#include "protocol_examples_common.h"
#include "lwip/err.h"
#include "lwip/apps/sntp.h"
/* The examples use simple WiFi configuration that you can set via
'make menuconfig'.
If you'd rather not, just change the below entries to strings with
the config you want - ie #define EXAMPLE_WIFI_SSID "mywifissid"
*/
#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
/* FreeRTOS event group to signal when we are connected & ready to make a request */
static EventGroupHandle_t wifi_event_group;
/* The event group allows multiple bits for each event,
but we only care about one event - are we connected
to the AP with an IP? */
const int CONNECTED_BIT = BIT0;
static const char *TAG = "example";
/* Variable holding number of times ESP32 restarted since first boot.
@ -50,8 +33,6 @@ RTC_DATA_ATTR static int boot_count = 0;
static void obtain_time(void);
static void initialize_sntp(void);
static void initialise_wifi(void);
static esp_err_t event_handler(void *ctx, system_event_t *event);
void app_main()
@ -94,9 +75,15 @@ void app_main()
static void obtain_time(void)
{
ESP_ERROR_CHECK( nvs_flash_init() );
initialise_wifi();
xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
false, true, portMAX_DELAY);
tcpip_adapter_init();
ESP_ERROR_CHECK( esp_event_loop_create_default() );
/* This helper function configures Wi-Fi or Ethernet, as selected in menuconfig.
* Read "Establishing Wi-Fi or Ethernet Connection" section in
* examples/protocols/README.md for more information about this function.
*/
ESP_ERROR_CHECK(example_connect());
initialize_sntp();
// wait for time to be set
@ -111,7 +98,7 @@ static void obtain_time(void)
localtime_r(&now, &timeinfo);
}
ESP_ERROR_CHECK( esp_wifi_stop() );
ESP_ERROR_CHECK( example_disconnect() );
}
static void initialize_sntp(void)
@ -121,44 +108,3 @@ static void initialize_sntp(void)
sntp_setservername(0, "pool.ntp.org");
sntp_init();
}
static void initialise_wifi(void)
{
tcpip_adapter_init();
wifi_event_group = xEventGroupCreate();
ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
wifi_config_t wifi_config = {
.sta = {
.ssid = EXAMPLE_WIFI_SSID,
.password = EXAMPLE_WIFI_PASS,
},
};
ESP_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
ESP_ERROR_CHECK( esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config) );
ESP_ERROR_CHECK( esp_wifi_start() );
}
static esp_err_t event_handler(void *ctx, system_event_t *event)
{
switch(event->event_id) {
case SYSTEM_EVENT_STA_START:
esp_wifi_connect();
break;
case SYSTEM_EVENT_STA_GOT_IP:
xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
break;
case SYSTEM_EVENT_STA_DISCONNECTED:
/* This is a workaround as ESP32 WiFi libs don't currently
auto-reassociate. */
esp_wifi_connect();
xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
break;
default:
break;
}
return ESP_OK;
}