ESP32 Forum

Posted: **Tue Dec 13, 2016 4:58 pm**

I'm on Windows, and I finally got it to flash after following Rudi's post here:
http://esp32.com/viewtopic.php?f=13&p=1512#p1512

So, it looks like it flashed, but it's weird because I don't see "Erasing flash" anywhere, just multiple writes:

Code: Select all

$ make flash
Flashing binaries to serial port COM9 (app at offset 0x10000)...
esptool.py v2.0-dev
Connecting...
Uploading stub...
Running stub...
Stub running...
Attaching SPI flash...
Configuring flash size...
Wrote 16384 bytes at 0x00001000 in 1.4 seconds (91.4 kbit/s)...
Hash of data verified.
Wrote 491520 bytes at 0x00010000 in 43.4 seconds (90.7 kbit/s)...
Hash of data verified.
Wrote 16384 bytes at 0x00008000 in 1.4 seconds (91.6 kbit/s)...
Hash of data verified.

Leaving...

The AP does not show up on any other wifi device -- I feel like I am doing something wrong:

Code: Select all

#include "freertos/FreeRTOS.h"
#include "esp_wifi.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_event_loop.h"
#include "nvs_flash.h"
#include "driver/gpio.h"



esp_err_t wifi_event_handler(void *ctx, system_event_t *event)
{
	switch(event->event_id)
	{
	//case SYSTEM_EVENT_STA_START:
	//	ESP_ERROR_CHECK(esp_wifi_connect());
	//	break;
	default:
		break;
	}

	return ESP_OK;
}

void app_main(void)
{
    nvs_flash_init();
    tcpip_adapter_init();

    ESP_ERROR_CHECK( esp_event_loop_init(wifi_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) );
    ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_AP) );

    wifi_config_t apConfig = {
    		.ap = {
    				.ssid="test12",
					.password="testttt",
					.ssid_len = 0,
					.channel = 0,
					.authmode = WIFI_AUTH_OPEN,
					.ssid_hidden = 0,
					.max_connection=4,
					.beacon_interval = 100
    		}
    };

    ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_AP, &apConfig) );
    ESP_ERROR_CHECK( esp_wifi_start() );
    ESP_ERROR_CHECK( esp_wifi_connect() );

    gpio_set_direction(GPIO_NUM_4, GPIO_MODE_OUTPUT);
    int level = 0;
    while (true) {
        gpio_set_level(GPIO_NUM_4, level);
        level = !level;
        vTaskDelay(300 / portTICK_PERIOD_MS);
    }
}

Any ideas?

Posted: **Tue Dec 13, 2016 9:39 pm**

Hi arao23,

esptool.py doesn't currently reset the ESP32 after flashing, you have to press the reset button (also labelled EN on some boards) to run the program.

If you connect a serial terminal program at 115200bps and press reset, what output do you see?

Angus

Posted: **Tue Dec 13, 2016 9:44 pm**

Thanks Angus, noticed in the serial terminal program that it was panicking at esp_wifi_connect() as it was only an AP, not a station, so there was nothing to connect to. After commenting out that line, it boots up properly.

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