+--------------------------------------------------------------+
|                     ESP32-S3 Gaming Core                     |
|                                                              |
|  +---------------------+        +-------------------------+  |
|  | Tactile Gamepad     |        | 8MB Octal PSRAM         |  |
|  | D-Pad & Action Btns |        | ROM Framebuffer Buffer  |  |
|  +---------------------+        +-------------------------+  |
|             |                                |               |
|             v                                v               |
|  +--------------------------------------------------------+  |
|  | FreeRTOS 60 FPS Emulator Loop (Core 1) & Audio DSP (C0)|  |
|  +--------------------------------------------------------+  |
|             |                                |               |
|             v                                v               |
|  +---------------------+        +-------------------------+  |
|  | ST7789 IPS Display  |        | MAX98357A I2S Class-D   |  |
|  | 40MHz SPI DMA Bus   |        | Micro Cavity Speaker    |  |
|  +---------------------+        +-------------------------+  |
+--------------------------------------------------------------+

[ESP32-S3 DevKit]                                  [ST7789 2.0" IPS LCD]
+------------------+                              +-----------------------+
|           GPIO10 |----------------------------->| CS                    |
|            GPIO9 |----------------------------->| DC                    |
|            GPIO8 |----------------------------->| RST                   |
|           GPIO11 |----------------------------->| SDA (MOSI)            |
|           GPIO12 |----------------------------->| SCL (SCK)             |
|                  |                              +-----------------------+
|    GPIO 1, 2, 3,4|<--- [Tactile D-Pad Buttons to GND]
|    GPIO 5, 6     |<--- [Action Buttons A/B to GND]
|                  |
|           GPIO14 |-----------------------------> [MAX98357A BCLK]
|           GPIO15 |-----------------------------> [MAX98357A LRC]
|           GPIO16 |-----------------------------> [MAX98357A DIN]
|                  |                              +-----------------------+
|             3.3V |-----------------------------> VCC (ST7789)
|             5.0V |-----------------------------> VIN (MAX98357A Amp)
|              GND |-----------------------------> Common Ground Plane
+------------------+

/*
* Portable Handheld Retro Console with ESP32-S3 & ST7789
* Target: ESP32-S3 + ST7789 2.0" IPS + I2S Audio + Gamepad
*/
#include <Arduino.h>
#include <SPI.h>
#include <driver/i2s.h>
#define TFT_CS      10
#define TFT_DC      9
#define TFT_RST     8
#define TFT_MOSI    11
#define TFT_SCK     12
#define BTN_UP      1
#define BTN_DOWN    2
#define BTN_LEFT    3
#define BTN_RIGHT   4
#define BTN_A       5
#define BTN_B       6
#define I2S_BCK     14
#define I2S_WS      15
#define I2S_DO      16
void init_gamepad() {
pinMode(BTN_UP, INPUT_PULLUP);
pinMode(BTN_DOWN, INPUT_PULLUP);
pinMode(BTN_LEFT, INPUT_PULLUP);
pinMode(BTN_RIGHT, INPUT_PULLUP);
pinMode(BTN_A, INPUT_PULLUP);
pinMode(BTN_B, INPUT_PULLUP);
}
void init_i2s_sound() {
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),
.sample_rate = 44100,
.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = I2S_COMM_FORMAT_STAND_I2S,
.intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
.dma_buf_count = 2,
.dma_buf_len = 128,
.use_apll = false,
.tx_desc_auto_clear = true
};
i2s_pin_config_t pin_config = {
.bck_io_num = I2S_BCK,
.ws_io_num = I2S_WS,
.data_out_num = I2S_DO,
.data_in_num = I2S_PIN_NO_CHANGE
};
i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
i2s_set_pin(I2S_NUM_0, &pin_config);
}
void game_loop_task(void *pvParameters) {
int player_x = 160;
int player_y = 120;
while (1) {
// Read Gamepad
if (digitalRead(BTN_LEFT) == LOW)  player_x -= 2;
if (digitalRead(BTN_RIGHT) == LOW) player_x += 2;
if (digitalRead(BTN_UP) == LOW)    player_y -= 2;
if (digitalRead(BTN_DOWN) == LOW)  player_y += 2;
// Constrain to screen bounds
player_x = constrain(player_x, 10, 310);
player_y = constrain(player_y, 10, 230);
// In production: draw scanline DMA buffer to ST7789 at 60 FPS
vTaskDelay(pdMS_TO_TICKS(16)); // ~60 FPS
}
}
void setup() {
Serial.begin(115200);
init_gamepad();
init_i2s_sound();
xTaskCreatePinnedToCore(game_loop_task, "GameLoop", 4096, NULL, 5, NULL, 1);
Serial.println("ESP32-S3 Retro Handheld Console Booted.");
}
void loop() {
vTaskDelay(pdMS_TO_TICKS(1000));
}