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Added ESP32-P4 generic target file for developpement purpose (#212)
Adds a ESP32-P4 generic target file for development that can be replicated on a breadboard.
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‎components/retro-go/config.h‎

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#include "targets/vmu/config.h"
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#elif defined(RG_TARGET_CROKPOCKET)
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#include "targets/crokpocket/config.h"
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#elif defined(RG_TARGET_ESP32_P4)
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#include "targets/esp32-p4/config.h"
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#else
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#warning "No target defined. Defaulting to ODROID-GO."
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#include "targets/odroid-go/config.h"

‎components/retro-go/drivers/display/ili9341.h‎

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@@ -117,6 +117,9 @@ static void spi_init(void)
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.queue_size = SPI_TRANSACTION_COUNT, // We want to be able to queue 5 transactions at a time
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.pre_cb = &spi_pre_transfer_cb, // Specify pre-transfer callback to handle D/C line and SPI lock
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.flags = SPI_DEVICE_NO_DUMMY, // SPI_DEVICE_HALFDUPLEX;
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#ifdef RG_TARGET_ESP32_P4
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.clock_source = SPI_CLK_SRC_SPLL,
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#endif
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};
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esp_err_t ret;

‎components/retro-go/rg_storage.c‎

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#define SDCARD_DO_TRANSACTION sdspi_host_do_transaction
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#elif defined(RG_STORAGE_SDMMC_HOST)
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#include <driver/sdmmc_host.h>
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#ifdef CONFIG_IDF_TARGET_ESP32P4
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#include "sd_pwr_ctrl_by_on_chip_ldo.h"
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#endif
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#define SDCARD_DO_TRANSACTION sdmmc_host_do_transaction
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#endif
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@@ -121,18 +124,32 @@ void rg_storage_init(void)
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RG_LOGI("Looking for SD Card using SDMMC...");
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sdmmc_host_t host_config = SDMMC_HOST_DEFAULT();
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host_config.flags = SDMMC_HOST_FLAG_1BIT;
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host_config.slot = RG_STORAGE_SDMMC_HOST;
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host_config.max_freq_khz = RG_STORAGE_SDMMC_SPEED;
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host_config.do_transaction = &sdcard_do_transaction;
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#ifdef CONFIG_IDF_TARGET_ESP32P4
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sd_pwr_ctrl_ldo_config_t ldo_config = {
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.ldo_chan_id = 4,
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};
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sd_pwr_ctrl_handle_t pwr_ctrl_handle = NULL;
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esp_err_t ret = sd_pwr_ctrl_new_on_chip_ldo(&ldo_config, &pwr_ctrl_handle);
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if (ret != ESP_OK) {
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RG_LOGE("Failed to create a new on-chip LDO power control driver");
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return;
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}
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host_config.pwr_ctrl_handle = pwr_ctrl_handle;
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#endif
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sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
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slot_config.width = 1;
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#if SOC_SDMMC_USE_GPIO_MATRIX /* Only the esp32-s3 routes SDMMC through the GPIO matrix */
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slot_config.clk = RG_GPIO_SDMMC_CLK;
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slot_config.cmd = RG_GPIO_SDMMC_CMD;
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slot_config.d0 = RG_GPIO_SDMMC_D0;
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#if defined(RG_GPIO_SDMMC_D1) && defined(RG_GPIO_SDMMC_D2) && defined(RG_GPIO_SDMMC_D3)
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slot_config.width = 4;
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slot_config.d1 = RG_GPIO_SDMMC_D1;
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slot_config.d2 = RG_GPIO_SDMMC_D2;
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slot_config.d3 = RG_GPIO_SDMMC_D3;

‎components/retro-go/targets/esp32-p4/config.h‎

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/* Configuration for the ESP32-P4 dev board
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* The GPIOs were chosen arbitrarily, but you can choose whatever you want thanks to the I/O MUX
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* command to build: python rg_tool.py --target esp32-p4 build-img --no-networking
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*/
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/****************************************************************************
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* Target definition for ESP32-P4 Dev-Board *
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****************************************************************************/
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#define RG_TARGET_NAME "ESP32-P4"
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/****************************************************************************
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* Status LED *
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****************************************************************************/
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// #define RG_LED_DRIVER 1 // 1 = GPIO
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// #define RG_GPIO_LED GPIO_NUM_NC
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// #define RG_GPIO_LED_INVERT // Uncomment if the LED is active LOW
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/****************************************************************************
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* I2C / GPIO Extender *
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****************************************************************************/
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// #define RG_I2C_GPIO_DRIVER 0 // 1 = AW9523, 2 = PCF9539, 3 = MCP23017, 4 = PCF8575
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// #define RG_I2C_GPIO_ADDR 0x00
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// #define RG_GPIO_I2C_SDA GPIO_NUM_15
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// #define RG_GPIO_I2C_SCL GPIO_NUM_4
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/****************************************************************************
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* Storage *
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****************************************************************************/
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#define RG_STORAGE_ROOT "/sd"
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// #define RG_STORAGE_SDSPI_HOST SPI2_HOST
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// #define RG_STORAGE_SDSPI_SPEED SDMMC_FREQ_DEFAULT
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// #define RG_GPIO_SDSPI_MISO GPIO_NUM_19
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// #define RG_GPIO_SDSPI_MOSI GPIO_NUM_23
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// #define RG_GPIO_SDSPI_CLK GPIO_NUM_18
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// #define RG_GPIO_SDSPI_CS GPIO_NUM_22
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#define RG_STORAGE_SDMMC_HOST SDMMC_HOST_SLOT_1
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#define RG_STORAGE_SDMMC_SPEED SDMMC_FREQ_HIGHSPEED
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#define RG_GPIO_SDMMC_CLK GPIO_NUM_43
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#define RG_GPIO_SDMMC_CMD GPIO_NUM_44
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#define RG_GPIO_SDMMC_D0 GPIO_NUM_39
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#define RG_GPIO_SDMMC_D1 GPIO_NUM_40
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#define RG_GPIO_SDMMC_D2 GPIO_NUM_41
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#define RG_GPIO_SDMMC_D3 GPIO_NUM_42
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// #define RG_STORAGE_FLASH_PARTITION "vfs"
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/****************************************************************************
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* Audio *
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****************************************************************************/
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#define RG_AUDIO_USE_INT_DAC 0 // 0 = Disable, 1 = GPIO25, 2 = GPIO26, 3 = Both
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#define RG_AUDIO_USE_EXT_DAC 1 // 0 = Disable, 1 = Enable
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#define RG_GPIO_SND_I2S_BCK GPIO_NUM_48
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#define RG_GPIO_SND_I2S_WS GPIO_NUM_49
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#define RG_GPIO_SND_I2S_DATA GPIO_NUM_46
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#define RG_GPIO_SND_AMP_ENABLE GPIO_NUM_47
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// #define RG_GPIO_SND_AMP_ENABLE_INVERT // Uncomment if the mute = HIGH
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/****************************************************************************
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* Video *
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****************************************************************************/
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#define RG_SCREEN_DRIVER 0 // 0 = ILI9341/ST7789
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#define RG_SCREEN_HOST SPI3_HOST
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#define RG_SCREEN_SPEED SPI_MASTER_FREQ_80M // SPI_MASTER_FREQ_40M
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#define RG_SCREEN_BACKLIGHT 0
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#define RG_SCREEN_WIDTH 320
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#define RG_SCREEN_HEIGHT 240
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#define RG_SCREEN_ROTATE 0
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#define RG_SCREEN_VISIBLE_AREA {0, 0, 0, 0} // Left, Top, Right, Bottom
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#define RG_SCREEN_SAFE_AREA {0, 0, 0, 0} // Left, Top, Right, Bottom
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#define RG_SCREEN_PARTIAL_UPDATES 1
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#define RG_SCREEN_INIT() \
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ILI9341_CMD(0xCF, 0x00, 0xc3, 0x30); \
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ILI9341_CMD(0xED, 0x64, 0x03, 0x12, 0x81); \
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ILI9341_CMD(0xE8, 0x85, 0x00, 0x78); \
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ILI9341_CMD(0xCB, 0x39, 0x2c, 0x00, 0x34, 0x02); \
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ILI9341_CMD(0xF7, 0x20); \
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ILI9341_CMD(0xEA, 0x00, 0x00); \
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ILI9341_CMD(0xC0, 0x1B); /* Power control //VRH[5:0] */ \
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ILI9341_CMD(0xC1, 0x12); /* Power control //SAP[2:0];BT[3:0] */ \
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ILI9341_CMD(0xC5, 0x32, 0x3C); /* VCM control */ \
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ILI9341_CMD(0xC7, 0x91); /* VCM control2 */ \
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ILI9341_CMD(0x36, 0x08); /* Memory Access Control */ \
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ILI9341_CMD(0xB1, 0x00, 0x10); /* Frame Rate Control (1B=70, 1F=61, 10=119) */ \
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ILI9341_CMD(0xB6, 0x0A, 0xA2); /* Display Function Control */ \
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ILI9341_CMD(0xF6, 0x01, 0x30); \
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ILI9341_CMD(0xF2, 0x00); /* 3Gamma Function Disable */ \
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ILI9341_CMD(0x26, 0x01); /* Gamma curve selected */ \
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ILI9341_CMD(0xE0, 0xD0, 0x00, 0x02, 0x07, 0x0a, 0x28, 0x32, 0x44, 0x42, 0x06, 0x0e, 0x12, 0x14, 0x17); \
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ILI9341_CMD(0xE1, 0xD0, 0x00, 0x02, 0x07, 0x0a, 0x28, 0x31, 0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1b, 0x1e);
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//#define RG_GPIO_LCD_MISO GPIO_NUM_NC
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#define RG_GPIO_LCD_MOSI GPIO_NUM_22
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#define RG_GPIO_LCD_CLK GPIO_NUM_23
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#define RG_GPIO_LCD_CS GPIO_NUM_24
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#define RG_GPIO_LCD_DC GPIO_NUM_25
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#define RG_GPIO_LCD_RST GPIO_NUM_26
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// #define RG_GPIO_LCD_BCKL GPIO_NUM_NC
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// #define RG_GPIO_LCD_BCKL_INVERT // Uncomment if the LED is active LOW
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/****************************************************************************
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* Input *
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****************************************************************************/
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// Refer to rg_input.h to see all available RG_KEY_* and RG_GAMEPAD_*_MAP types
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#define RG_GAMEPAD_GPIO_MAP {\
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{RG_KEY_LEFT, .num = GPIO_NUM_13, .pullup = 1, .level = 0},\
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{RG_KEY_RIGHT, .num = GPIO_NUM_14, .pullup = 1, .level = 0},\
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{RG_KEY_UP, .num = GPIO_NUM_15, .pullup = 1, .level = 0},\
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{RG_KEY_DOWN, .num = GPIO_NUM_16, .pullup = 1, .level = 0},\
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{RG_KEY_SELECT, .num = GPIO_NUM_17, .pullup = 1, .level = 0},\
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{RG_KEY_START, .num = GPIO_NUM_18, .pullup = 1, .level = 0},\
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{RG_KEY_MENU, .num = GPIO_NUM_19, .pullup = 1, .level = 0},\
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{RG_KEY_A, .num = GPIO_NUM_20, .pullup = 1, .level = 0},\
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{RG_KEY_B, .num = GPIO_NUM_21, .pullup = 1, .level = 0},\
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{RG_KEY_X, .num = GPIO_NUM_12, .pullup = 1, .level = 0},\
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{RG_KEY_Y, .num = GPIO_NUM_11, .pullup = 1, .level = 0},\
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{RG_KEY_L, .num = GPIO_NUM_10, .pullup = 1, .level = 0},\
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{RG_KEY_R, .num = GPIO_NUM_9, .pullup = 1, .level = 0},\
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}
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/****************************************************************************
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* Battery *
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****************************************************************************/
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// #define RG_BATTERY_DRIVER 1 // 1 = ADC, 2 = MRGC
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// #define RG_BATTERY_ADC_UNIT ADC_UNIT_1
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// #define RG_BATTERY_ADC_CHANNEL ADC_CHANNEL_0
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// #define RG_BATTERY_CALC_PERCENT(raw) (((raw) * 2.f - 3500.f) / (4200.f - 3500.f) * 100.f)
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// #define RG_BATTERY_CALC_VOLTAGE(raw) ((raw) * 2.f * 0.001f)
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/****************************************************************************
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* Updater *
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****************************************************************************/
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// #define RG_UPDATER_ENABLE 1
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// #define RG_UPDATER_APPLICATION RG_APP_FACTORY
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// #define RG_UPDATER_DOWNLOAD_LOCATION RG_STORAGE_ROOT "/odroid/firmware"
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/****************************************************************************
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* Miscellaneous *
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****************************************************************************/
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#define RG_RECOVERY_BTN RG_KEY_MENU // Keep this button pressed to open the recovery menu
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#define RG_CUSTOM_PLATFORM_INIT() \
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/* Arbitrary code executed very early during retro-go init */
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// See components/retro-go/config.h for more things you can define here!

‎components/retro-go/targets/esp32-p4/docs/ESP32-P4_breadboard_setup.jpg‎

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‎components/retro-go/targets/esp32-p4/docs/ESP32-P4_devboard.png‎

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‎components/retro-go/targets/esp32-p4/docs/README.md‎

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This is a very early "port" whose performance could be improved by adapting retro-go even further for the P4.
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Networking has not been tested yet, so build the image without it:
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command to build: `python rg_tool.py --target esp32-p4 build-img --no-networking`
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ESP-IDF v5.5 is recommended.
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## ESP32-P4
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- Status: development target
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## Hardware
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- Module: ESP32-P4-MINI Development Board ref: https://www.cnx-software.com/2025/06/05/esp32-p4-mini-development-board-offers-two-34-pin-gpio-headers-esp32-c6-wireless-module
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- ST7789V 320*240 2 inches SPI Display ref: LCD TFT 2.0 inches, IC ST7789V 240RGBx320, SPI
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- SD card over SDMMC (4 bits)
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- NS4168 Dac (but any I2S DAC should work)
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- Built on breadboard
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## Images
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![ESP32-P4_breadboard_setup.jpg](ESP32-P4_breadboard_setup.jpg)
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![SPI_ST7789V_2_inches.png](SPI_ST7789V_2_inches.png)
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![ESP32-P4_devboard.png](ESP32-P4_devboard.png)

‎components/retro-go/targets/esp32-p4/docs/SPI_ST7789V_2_inches.png‎

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‎components/retro-go/targets/esp32-p4/env.py‎

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# This file is injected late into rg_tool.py, you can run arbitrary python code here
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# For example override python variables or set environment variables with os.putenv
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# Espressif chip in the device
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IDF_TARGET = "esp32p4"
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# .fw file format, if supported by the device
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# FW_FORMAT = "odroid"
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# Default apps to build when none is specified (comment to build all)
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DEFAULT_APPS = "launcher retro-core gwenesis fmsx prboom-go gbsp"

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