willem/Pico-GB
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Trivial modifications to match my use case in a Lego Game Boy.

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Staacks
2025-10-01 15:49:32 +02:00
parent 84d29789d5
commit 78527c8fc9
6 changed files with 45 additions and 36 deletions
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README.md
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@@ -1,3 +1,18 @@
# About this fork
This is a fork of [tobigun's fork of the Pico-GB Game Boy emulator](https://github.com/tobigun/Pico-GB). I only changed very few things to make it easy to use for a display addition to Lego's official Game Boy set as I describe it in my blog post at [there.oughta.be/a/lego-game-boy](https://there.oughta.be/a/lego-game-boy).
My modifications are trivial:
* Disable sound and SD card features
* Disable input by setting all inputs to the unused GPIO 0
* Set display driver and pinout according to the display used in my post (see [there.oughta.be/a/lego-game-boy](https://there.oughta.be/a/lego-game-boy) ).
* Change default to stretched scaling
* Set the grayscale color palette
Below is the original readme.
---
# RP2040-GB for Pico-GB # RP2040-GB for Pico-GB
This is a fork of [YouMakeTech's Pico-GB Game Boy emulator](https://github.com/YouMakeTech/Pico-GB) which again is a fork of the [Peanut-GB based RP2040-GB Game Boy (DMG) emulator from deltabeard](https://github.com/deltabeard/Peanut-GB). This is a fork of [YouMakeTech's Pico-GB Game Boy emulator](https://github.com/YouMakeTech/Pico-GB) which again is a fork of the [Peanut-GB based RP2040-GB Game Boy (DMG) emulator from deltabeard](https://github.com/deltabeard/Peanut-GB).
platformio.ini
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@@ -25,9 +25,10 @@ build_flags =
-I. -I.
-Isrc/tft-espi-config -Isrc/tft-espi-config
-Ilib -Ilib
-DENABLE_SOUND=1 -DENABLE_SOUND=0
-DENABLE_LCD=1 -DENABLE_LCD=1
-DENABLE_SDCARD=1 -DENABLE_SDCARD=0
-DENABLE_INPUT=1
-DENABLE_LCD_DMA=1 -DENABLE_LCD_DMA=1
-DENABLE_LCD_FRAMEBUFFER=1 -DENABLE_LCD_FRAMEBUFFER=1
-DENABLE_FRAMEBUFFER_FLIP_X_Y=1 -DENABLE_FRAMEBUFFER_FLIP_X_Y=1
src/common.h
+12 -12
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@@ -29,14 +29,14 @@
#define PIN_START 7 #define PIN_START 7
#elif ENABLE_INPUT == INPUT_GPIO #elif ENABLE_INPUT == INPUT_GPIO
// Use GPIOs directly on Pico for Joypad // Use GPIOs directly on Pico for Joypad
#define PIN_UP 2 #define PIN_UP 0
#define PIN_DOWN 3 #define PIN_DOWN 0
#define PIN_LEFT 4 #define PIN_LEFT 0
#define PIN_RIGHT 5 #define PIN_RIGHT 0
#define PIN_A 6 #define PIN_A 0
#define PIN_B 7 #define PIN_B 0
#define PIN_SELECT 8 #define PIN_SELECT 0
#define PIN_START 9 #define PIN_START 0
#endif #endif
#if ENABLE_SOUND #if ENABLE_SOUND
@@ -46,10 +46,10 @@
#if ENABLE_SDCARD #if ENABLE_SDCARD
#define SD_SPI SPI #define SD_SPI SPI
#define SD_CS_PIN 17 #define SD_CS_PIN 13
#define SD_SCK_PIN 18 #define SD_SCK_PIN 14
#define SD_MOSI_PIN 19 #define SD_MOSI_PIN 15
#define SD_MISO_PIN 16 #define SD_MISO_PIN 12
extern uint8_t _FS_start; extern uint8_t _FS_start;
extern uint8_t _FS_end; extern uint8_t _FS_end;
src/lcd_core.cpp
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@@ -44,7 +44,7 @@ static uint8_t scaledLineOffsetTable[LCD_HEIGHT]; // scaled to 240 lines
/* Pixel data is stored in here. */ /* Pixel data is stored in here. */
static uint8_t pixels_buffer[LCD_WIDTH]; static uint8_t pixels_buffer[LCD_WIDTH];
volatile ScalingMode scalingMode = ScalingMode::STRETCH_KEEP_ASPECT; volatile ScalingMode scalingMode = ScalingMode::STRETCH;
static int lcd_line_busy = 0; static int lcd_line_busy = 0;
src/main.cpp
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@@ -68,7 +68,8 @@ void startEmulator() {
/* Automatically assign a colour palette to the game */ /* Automatically assign a colour palette to the game */
char rom_title[16]; char rom_title[16];
auto_assign_palette(palette, gb_colour_hash(&gb), gb_get_rom_name(&gb, rom_title)); //auto_assign_palette(palette, gb_colour_hash(&gb), gb_get_rom_name(&gb, rom_title));
get_colour_palette(palette, 0x16, 0x00);
#if ENABLE_LCD #if ENABLE_LCD
gb_init_lcd(&gb, &lcd_draw_line); gb_init_lcd(&gb, &lcd_draw_line);
@@ -166,7 +167,6 @@ void setup() {
void loop() { void loop() {
gb.gb_frame = 0; gb.gb_frame = 0;
do { do {
__gb_step_cpu(&gb); __gb_step_cpu(&gb);
tight_loop_contents(); tight_loop_contents();
src/tft-espi-config/tft_setup.h
+12 -19
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@@ -22,10 +22,10 @@
// Tell the library to use parallel mode (otherwise SPI is assumed) // Tell the library to use parallel mode (otherwise SPI is assumed)
//#define TFT_PARALLEL_8_BIT //#define TFT_PARALLEL_8_BIT
#define TFT_PARALLEL_16_BIT // **** 16-bit parallel ONLY for RP2040 processor **** //#define TFT_PARALLEL_16_BIT // **** 16-bit parallel ONLY for RP2040 processor ****
// Only define one driver, the other ones must be commented out // Only define one driver, the other ones must be commented out
#define ILI9341_DRIVER // Generic driver for common displays //#define ILI9341_DRIVER // Generic driver for common displays
//#define ILI9341_2_DRIVER // Alternative ILI9341 driver, see https://github.com/Bodmer/TFT_eSPI/issues/1172 //#define ILI9341_2_DRIVER // Alternative ILI9341 driver, see https://github.com/Bodmer/TFT_eSPI/issues/1172
//#define ST7735_DRIVER // Define additional parameters below for this display //#define ST7735_DRIVER // Define additional parameters below for this display
//#define ILI9163_DRIVER // Define additional parameters below for this display //#define ILI9163_DRIVER // Define additional parameters below for this display
@@ -35,7 +35,7 @@
//#define ILI9481_DRIVER //#define ILI9481_DRIVER
//#define ILI9486_DRIVER //#define ILI9486_DRIVER
//#define ILI9488_DRIVER // WARNING: Do not connect ILI9488 display SDO to MISO if other devices share the SPI bus (TFT SDO does NOT tristate when CS is high) //#define ILI9488_DRIVER // WARNING: Do not connect ILI9488 display SDO to MISO if other devices share the SPI bus (TFT SDO does NOT tristate when CS is high)
//#define ST7789_DRIVER // Full configuration option, define additional parameters below for this display #define ST7789_DRIVER // Full configuration option, define additional parameters below for this display
//#define ST7789_2_DRIVER // Minimal configuration option, define additional parameters below for this display //#define ST7789_2_DRIVER // Minimal configuration option, define additional parameters below for this display
//#define R61581_DRIVER //#define R61581_DRIVER
//#define RM68140_DRIVER //#define RM68140_DRIVER
@@ -100,22 +100,15 @@
// driven with a PWM signal or turned OFF/ON then this must be handled by the user // driven with a PWM signal or turned OFF/ON then this must be handled by the user
// sketch. e.g. with digitalWrite(TFT_BL, LOW); // sketch. e.g. with digitalWrite(TFT_BL, LOW);
// #define TFT_BL 32 // LED back-light control pin #define TFT_BL 14 // LED back-light control pin
// #define TFT_BACKLIGHT_ON HIGH // Level to turn ON back-light (HIGH or LOW) #define TFT_BACKLIGHT_ON HIGH // Level to turn ON back-light (HIGH or LOW)
#define TFT_D0 0 #define TFT_MOSI 9
#define TFT_D1 1 #define TFT_SCLK 10
#define TFT_D2 2 #define TFT_DC 13 // Data Command control pin
#define TFT_D3 3 #define TFT_CS 11 // Chip select control pin D8
#define TFT_D4 4 #define TFT_RST 12 // Reset pin (could connect to NodeMCU RST, see next line)
#define TFT_D5 5 //#define TFT_RST -1 // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V
#define TFT_D6 6
#define TFT_D7 7
#define TFT_WR 18 // Write strobe for modified Raspberry Pi TFT only
#define TFT_DC 19 // Data Command control pin
#define TFT_CS 22 // Chip select control pin D8
//#define TFT_RST 22 // Reset pin (could connect to NodeMCU RST, see next line)
#define TFT_RST -1 // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V
// ################################################################################## // ##################################################################################
// //
@@ -150,7 +143,7 @@
// ################################################################################## // ##################################################################################
// For RP2040 processor and SPI displays, uncomment the following line to use the PIO interface. // For RP2040 processor and SPI displays, uncomment the following line to use the PIO interface.
//#define RP2040_PIO_SPI // Leave commented out to use standard RP2040 SPI port interface #define RP2040_PIO_SPI // Leave commented out to use standard RP2040 SPI port interface
// For RP2040 processor and 8 or 16-bit parallel displays: // For RP2040 processor and 8 or 16-bit parallel displays:
// The parallel interface write cycle period is derived from a division of the CPU clock // The parallel interface write cycle period is derived from a division of the CPU clock