Add Alpha ESPlay Micro Target

components/retro-go/targets/esplay-micro/config.h

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+// REF: https://www.makerfabs.com/esplay-micro-v2.html
+// This port developed for the Micro V2 listed above. Compatibility with the elusive V1 is unknown.
+
+// WORK IN PROGRESS!
+// Issues: Menu, L, and R aren't properly mapped yet. Menu and Select are both mapped to Select for now.
+// Battery meter isn't working yet.
+
+// Parts:
+// - ESP32-WROVER-B (SoC 16MB Flash + 8MB PSRAM)
+// - PCF8574 I2C GPIO (To connect the extra buttons)
+// - UDA1334A (I2S DAC)
+// - YT240L010 (ILI9341 LCD)
+// - TP4054 (Lipo Charger IC)
+// - CH340C (USB to Serial)
+// - 3.5mm Headphone jack 0_o
+
+// Target definition
+#define RG_TARGET_NAME             "ESPLAY-MICRO"
+
+// Storage
+#define RG_STORAGE_DRIVER           2                   // 0 = Host, 1 = SDSPI, 2 = SDMMC, 3 = USB, 4 = Flash
+#define RG_STORAGE_HOST             SDMMC_HOST_SLOT_1   // Used by SDSPI and SDMMC
+#define RG_STORAGE_SPEED            SDMMC_FREQ_DEFAULT  // Used by SDSPI and SDMMC
+#define RG_STORAGE_ROOT             "/sd"               // Storage mount point
+
+// Audio
+#define RG_AUDIO_USE_INT_DAC        0   // 0 = Disable, 1 = GPIO25, 2 = GPIO26, 3 = Both
+#define RG_AUDIO_USE_EXT_DAC        1   // 0 = Disable, 1 = Enable
+
+// Video
+#define RG_SCREEN_DRIVER            0   // 0 = ILI9341
+#define RG_SCREEN_HOST              SPI2_HOST
+#define RG_SCREEN_SPEED             SPI_MASTER_FREQ_40M
+#define RG_SCREEN_TYPE              6
+#define RG_SCREEN_WIDTH             320
+#define RG_SCREEN_HEIGHT            240
+#define RG_SCREEN_ROTATE            0  
+#define RG_SCREEN_MARGIN_TOP        0
+#define RG_SCREEN_MARGIN_BOTTOM     0
+#define RG_SCREEN_MARGIN_LEFT       0
+#define RG_SCREEN_MARGIN_RIGHT      0
+
+// Input
+#define RG_GAMEPAD_DRIVER           3   // 1 = ODROID-GO, 2 = Serial, 3 = I2C, 4 = AW9523, 5 = ESPLAY-S3, 6 = SDL2
+#define RG_GAMEPAD_HAS_MENU_BTN     1
+#define RG_GAMEPAD_HAS_OPTION_BTN   0
+
+// Note: Depending on the driver, the button map can represent bits, registers, keys, or gpios.
+#define RG_GAMEPAD_MAP_MENU         (1<<1)  // Temporarily shared mapping with Select until Menu mapping is found.
+#define RG_GAMEPAD_MAP_OPTION       (0)
+#define RG_GAMEPAD_MAP_START        (1<<8)
+#define RG_GAMEPAD_MAP_SELECT       (1<<1)
+#define RG_GAMEPAD_MAP_UP           (1<<2)
+#define RG_GAMEPAD_MAP_RIGHT        (1<<5)
+#define RG_GAMEPAD_MAP_DOWN         (1<<3)
+#define RG_GAMEPAD_MAP_LEFT         (1<<4)
+#define RG_GAMEPAD_MAP_A            (1<<7)  // "A" silkscreen on the board is (1<<6) Buttons swapped relative to standard Nintendo layout
+#define RG_GAMEPAD_MAP_B            (1<<6)  // "B" silkscreen on the board is (1<<7) Buttons swapped relative to standard Nintendo layout
+#define RG_GAMEPAD_MAP_X            (0)
+#define RG_GAMEPAD_MAP_Y            (0)
+#define RG_GAMEPAD_MAP_L            (0)     // 
+#define RG_GAMEPAD_MAP_R            (0)
+
+// Experimental. Caused "Menu" to be mapped to a D-pad direction.
+//#define RG_GPIO_GAMEPAD_X           GPIO_NUM_NC
+//#define RG_GPIO_GAMEPAD_Y           GPIO_NUM_NC
+//#define RG_GPIO_GAMEPAD_SELECT      GPIO_NUM_0
+//#define RG_GPIO_GAMEPAD_START       GPIO_NUM_36
+//#define RG_GPIO_GAMEPAD_A           GPIO_NUM_32
+//#define RG_GPIO_GAMEPAD_B           GPIO_NUM_33
+//#define RG_GPIO_GAMEPAD_MENU        GPIO_NUM_35
+//#define RG_GPIO_GAMEPAD_OPTION      GPIO_NUM_NC
+
+// Battery
+// #define RG_BATTERY_ADC_CHANNEL      ADC1_CHANNEL_3 
+#define RG_BATTERY_CALC_PERCENT(raw) (((raw) - 170) / 30.f * 100.f)
+#define RG_BATTERY_CALC_VOLTAGE(raw) (0)
+
+// Status LED
+#define RG_GPIO_LED                 GPIO_NUM_13 // Causes the "power" LED to blink on disk access.
+
+// I2C BUS
+#define RG_GPIO_I2C_SDA             GPIO_NUM_21
+#define RG_GPIO_I2C_SCL             GPIO_NUM_22
+
+// Display
+#define RG_GPIO_LCD_MISO            GPIO_NUM_NC
+#define RG_GPIO_LCD_MOSI            GPIO_NUM_23
+#define RG_GPIO_LCD_CLK             GPIO_NUM_18
+#define RG_GPIO_LCD_CS              GPIO_NUM_5
+#define RG_GPIO_LCD_DC              GPIO_NUM_12
+#define RG_GPIO_LCD_BCKL            GPIO_NUM_27
+
+// External I2S DAC
+#define RG_GPIO_SND_I2S_BCK         GPIO_NUM_26
+#define RG_GPIO_SND_I2S_WS          GPIO_NUM_25
+#define RG_GPIO_SND_I2S_DATA        GPIO_NUM_19
+#define RG_GPIO_SND_AMP_ENABLE      GPIO_NUM_4

components/retro-go/targets/esplay-micro/env.py

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+import os
+
+os.environ["IDF_TARGET"] = "esp32"
+os.environ["FW_FORMAT"] = "esplay"