/* Hello World Example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/

#include <driver/gpio.h>
#include <driver/spi_master.h>

#include <stdio.h>

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_spi_flash.h"

#include <u8g2.h>
#include "sdkconfig.h"
#include "u8g2_esp32_hal.h"

#ifdef CONFIG_IDF_TARGET_ESP32
#define CHIP_NAME "ESP32"
#endif

#ifdef CONFIG_IDF_TARGET_ESP32S2BETA
#define CHIP_NAME "ESP32-S2 Beta"
#endif


#define PIN_SDA 4
#define PIN_SCL 15

static char tag[] = "test_SSD1306";

void app_main(void)
{
    printf("Hello world!\n");

    // Setup HAL
    u8g2_esp32_hal_t u8g2_esp32_hal = U8G2_ESP32_HAL_DEFAULT;
    u8g2_esp32_hal.sda = PIN_SDA;
    u8g2_esp32_hal.scl = PIN_SCL;
    u8g2_esp32_hal_init(u8g2_esp32_hal);

    u8g2_t u8g2;

    // Init Driver
    u8g2_Setup_ssd1306_i2c_128x64_noname_f(
    	&u8g2,
    	U8G2_R0,
    	u8g2_esp32_i2c_byte_cb,
    	u8g2_esp32_gpio_and_delay_cb);
    u8x8_SetI2CAddress(&u8g2.u8x8, 0x78);


    // Blank Screen
    u8g2_InitDisplay(&u8g2);
    u8g2_SetPowerSave(&u8g2, 0);
    u8g2_ClearBuffer(&u8g2);
    u8g2_SendBuffer(&u8g2);

    /* Print chip information */
    esp_chip_info_t chip_info;
    esp_chip_info(&chip_info);
    printf("This is %s chip with %d CPU cores, WiFi%s%s, ",
            CHIP_NAME,
            chip_info.cores,
            (chip_info.features & CHIP_FEATURE_BT) ? "/BT" : "",
            (chip_info.features & CHIP_FEATURE_BLE) ? "/BLE" : "");

    printf("silicon revision %d, ", chip_info.revision);

    printf("%dMB %s flash\n", spi_flash_get_chip_size() / (1024 * 1024),
            (chip_info.features & CHIP_FEATURE_EMB_FLASH) ? "embedded" : "external");

    for (int i = 10; i >= 0; i--) {
        printf("Restarting in %d seconds...\n", i);
        vTaskDelay(1000 / portTICK_PERIOD_MS);
    }
    printf("Restarting now.\n");
    fflush(stdout);
    esp_restart();
}