esp32 esp-idf oled ssd1306 lifegame sample

main.c

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp32-oled-ssd1306/include/ssd1306.h"
#include "esp32-oled-ssd1306/include/fonts.h"
#include <string.h>

uint16_t get_index(uint8_t x, uint8_t y) {
	return x + (y / 8) * 128;
}

void app_main(void) {

	printf("Hello world!\n");

	uint8_t alpha[1024];
	uint8_t beta[1024];
	memset(alpha, 0, 1024);
	memset(beta, 0, 1024);
	uint8_t *front;
	uint8_t *back;
	for (int i = 0; i < 1024; i++) {
		alpha[i] = rand();
	}
	if (ssd1306_init(0, 4, 5)) {
		for (uint32_t generation = 0; true; generation++) {
			printf("Gen: %d \r", generation);
			fflush(stdout);
			front = generation % 2 == 1 ? alpha : beta;
			back = generation % 2 == 0 ? alpha : beta;
			memset(front, 0, 1024);

			for (uint8_t x = 1; x < 127; x++) {
				for (uint8_t y = 1; y < 63; y++) {
					uint8_t env = 0;
					// up
					if ((back[get_index(x - 1, y - 1)] & 1 << ((y - 1) % 8)) != 0)
						env++;
					if ((back[get_index(x + 0, y - 1)] & 1 << ((y - 1) % 8)) != 0)
						env++;
					if ((back[get_index(x + 1, y - 1)] & 1 << ((y - 1) % 8)) != 0)
						env++;

					// middle
					if ((back[get_index(x - 1, y + 0)] & 1 << ((y + 0) % 8)) != 0)
						env++;

					if ((back[get_index(x + 1, y + 0)] & 1 << ((y + 0) % 8)) != 0)
						env++;

					// down
					if ((back[get_index(x - 1, y + 1)] & 1 << ((y + 1) % 8)) != 0)
						env++;
					if ((back[get_index(x + 0, y + 1)] & 1 << ((y + 1) % 8)) != 0)
						env++;
					if ((back[get_index(x + 1, y + 1)] & 1 << ((y + 1) % 8)) != 0)
						env++;

					if ((back[get_index(x + 0, y + 0)] & 1 << ((y + 0) % 8)) != 0) {
						if (env == 2 || env == 3) {
							front[get_index(x, y)] |= (1 << (y % 8));
						}
					} else {
						if (env == 3) {
							front[get_index(x, y)] |= (1 << (y % 8));
						}

					}
				}
			}
			x_update_buffer(0, front, 1024);
			ssd1306_refresh(0, false);
			vTaskDelay(1000 / 60 / portTICK_PERIOD_MS);
		}
	} else {
		printf("init failed");
	}
}