Main File

esp32_wifi_main.c

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_spi_flash.h"
#include "lwip/err.h"
#include "lwip/sys.h"
#include "nvs_flash.h"

#include "wifi.h"
#include "ble.h"

/*
 *******************************************************************************
 *                              Global Variables                               *
 *******************************************************************************
*/


// Network configuration details
char g_wifi_ssid[32] 		= "Foo";
char g_wifi_pswd[64] 		= "bar";
unsigned int g_wifi_retc	= 3;



/* FreeRTOS Event Group */
EventGroupHandle_t g_wifi_event_group;



/*
 *******************************************************************************
 *                            Function Definitions                             *
 *******************************************************************************
*/


// Aborts with the given message and error. Suspends current task forever
void panic (const char *msg, esp_err_t err) {
	if (err != ESP_OK) {
		fprintf(stderr, "Panic: %s | \"%s\"\n", msg, esp_err_to_name(err));
	} else {
		fprintf(stderr, "Panic: %s\n", msg);
	}
	vTaskSuspend(NULL);
}

// Shutdown handler
void shutdown_handler (void) {
	printf(" -*- Shutdown -*-\n");
	fflush(stdout);
}

// Initializes flash-memory
esp_err_t init_flash (void) {
	esp_err_t err;

	// Attempt initialization
	err = nvs_flash_init();

	// Attempt to handle some errors
	if (err == ESP_ERR_NVS_NO_FREE_PAGES || 
		err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
		err = nvs_flash_erase();
		if (err == ESP_OK) {
			err = nvs_flash_init();
		}
	}

	return err;
}

// Starting point for the application
void app_main (void) {
	esp_err_t err;

	// Obtain and display flash memory size
	size_t flash_size_bytes = spi_flash_get_chip_size();
	printf("Flash (MB): %d\n", flash_size_bytes / (1024 * 1024));

	// Register a shutdown handler
	if ((err = esp_register_shutdown_handler(shutdown_handler)) != ESP_OK) {
		panic("Failed to register shutdown handler!", err);
	}

	// Flash MUST be initialized before WiFi now. So we do that first
	if ((err = init_flash()) != ESP_OK) {
		panic("Failed to initialize flash memory!", err);
	}


	// Start BLE
	if ((err = ble_init()) != ESP_OK) {
		fprintf(stderr, "BLE couldn't be started - sorry :(\n");
	}

}