use framebuffer

src/common.h

@@ -2,6 +2,12 @@
 
 #include <Arduino.h>
 
+#include "gb.h"
+
+// display is rotated, so TFT_WIDTH/HEIGHT cannot be used
+#define DISPLAY_WIDTH TFT_HEIGHT
+#define DISPLAY_HEIGHT TFT_WIDTH
+
 enum class ScalingMode {
   NORMAL = 0,
   STRETCH,
@@ -11,6 +17,10 @@ enum class ScalingMode {
 
 extern volatile ScalingMode scalingMode; 
 
+extern struct gb_s gb;
+extern palette_t palette; // Colour palette
+extern uint_fast32_t frames;
+
 /* Multicore command structure. */
 union core_cmd {
   struct
@@ -31,6 +41,12 @@ union core_cmd {
   uint32_t full;
 };
 
+void nextPalette();
+
+void prevPalette();
+
 void lcd_draw_line(struct gb_s* gb, const uint8_t* pixels, const uint_fast8_t line);
 
 void core1_init();
+
+void reset();

src/gb.cpp

@@ -0,0 +1,6 @@
+#include <Arduino.h>
+
+#include "peanut_gb_options.h"
+#include "peanut_gb.h"
+
+#include "gbcolors.h"

src/gb.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#define PEANUT_GB_HEADER_ONLY
+#include "peanut_gb_options.h"
+#include "peanut_gb.h"
+
+#define GBCOLOR_HEADER_ONLY
+#include "gbcolors.h"

src/input.cpp

@@ -0,0 +1,239 @@
+#include "common.h"
+#include "input.h"
+
+#include "gb.h"
+
+static struct
+{
+  unsigned a : 1;
+  unsigned b : 1;
+  unsigned select : 1;
+  unsigned start : 1;
+  unsigned right : 1;
+  unsigned left : 1;
+  unsigned up : 1;
+  unsigned down : 1;
+} prev_joypad_bits;
+
+#ifndef USE_PAD_GPIO
+static PCF8574 pcf8574(0x20, 16, 17);
+#endif
+
+
+#ifdef USE_PAD_GPIO
+void initJoypad() {
+  gpio_set_function(GPIO_UP, GPIO_FUNC_SIO);
+  gpio_set_function(GPIO_DOWN, GPIO_FUNC_SIO);
+  gpio_set_function(GPIO_LEFT, GPIO_FUNC_SIO);
+  gpio_set_function(GPIO_RIGHT, GPIO_FUNC_SIO);
+  gpio_set_function(GPIO_A, GPIO_FUNC_SIO);
+  gpio_set_function(GPIO_B, GPIO_FUNC_SIO);
+  gpio_set_function(GPIO_SELECT, GPIO_FUNC_SIO);
+  gpio_set_function(GPIO_START, GPIO_FUNC_SIO);
+
+  gpio_set_dir(GPIO_UP, false);
+  gpio_set_dir(GPIO_DOWN, false);
+  gpio_set_dir(GPIO_LEFT, false);
+  gpio_set_dir(GPIO_RIGHT, false);
+  gpio_set_dir(GPIO_A, false);
+  gpio_set_dir(GPIO_B, false);
+  gpio_set_dir(GPIO_SELECT, false);
+  gpio_set_dir(GPIO_START, false);
+
+  gpio_pull_up(GPIO_UP);
+  gpio_pull_up(GPIO_DOWN);
+  gpio_pull_up(GPIO_LEFT);
+  gpio_pull_up(GPIO_RIGHT);
+  gpio_pull_up(GPIO_A);
+  gpio_pull_up(GPIO_B);
+  gpio_pull_up(GPIO_SELECT);
+  gpio_pull_up(GPIO_START);
+}
+#else
+void initJoypad() {
+  for (int pin = 0; pin < 8; ++pin) {
+    pcf8574.pinMode(pin, INPUT_PULLUP);
+  }
+
+  pcf8574.setLatency(5);
+  
+  if (pcf8574.begin()){
+		Serial.println("PCF8574 initialized");
+	}else{
+		Serial.println("PCF8574 initialization failed");
+    while (true) ;
+	}
+}
+#endif
+
+void handleSerial() {
+  static uint64_t start_time = time_us_64();
+
+  /* Serial monitor commands */
+  int input = Serial.read();
+  if (input <= 0) {
+    return;
+  }
+
+  switch (input) {
+  case 'i':
+    gb.direct.interlace = !gb.direct.interlace;
+    break;
+
+  case 'f':
+    gb.direct.frame_skip = !gb.direct.frame_skip;
+    break;
+
+  case 'b': {
+    uint64_t end_time;
+    uint32_t diff;
+    uint32_t fps;
+
+    end_time = time_us_64();
+    diff = end_time - start_time;
+    fps = ((uint64_t)frames * 1000 * 1000) / diff;
+    Serial.printf("Frames: %u\n"
+                  "Time: %lu us\n"
+                  "FPS: %lu\n",
+        frames, diff, fps);
+    Serial.flush();
+    frames = 0;
+    start_time = time_us_64();
+    break;
+  }
+
+  case '\n':
+  case '\r': {
+    gb.direct.joypad_bits.start = 0;
+    break;
+  }
+
+  case '\b': {
+    gb.direct.joypad_bits.select = 0;
+    break;
+  }
+
+  case '8': {
+    gb.direct.joypad_bits.up = 0;
+    break;
+  }
+
+  case '2': {
+    gb.direct.joypad_bits.down = 0;
+    break;
+  }
+
+  case '4': {
+    gb.direct.joypad_bits.left = 0;
+    break;
+  }
+
+  case '6': {
+    gb.direct.joypad_bits.right = 0;
+    break;
+  }
+
+  case 'z':
+  case 'w': {
+    gb.direct.joypad_bits.a = 0;
+    break;
+  }
+
+  case 'x': {
+    gb.direct.joypad_bits.b = 0;
+    break;
+  }
+
+  case 'q':
+    reset();
+
+  case 'p':
+    nextPalette();
+
+  default:
+    break;
+  }
+}
+
+void handlePad() {
+  /* Update buttons state */
+  prev_joypad_bits.up = gb.direct.joypad_bits.up;
+  prev_joypad_bits.down = gb.direct.joypad_bits.down;
+  prev_joypad_bits.left = gb.direct.joypad_bits.left;
+  prev_joypad_bits.right = gb.direct.joypad_bits.right;
+  prev_joypad_bits.a = gb.direct.joypad_bits.a;
+  prev_joypad_bits.b = gb.direct.joypad_bits.b;
+  prev_joypad_bits.select = gb.direct.joypad_bits.select;
+  prev_joypad_bits.start = gb.direct.joypad_bits.start;
+
+#ifdef USE_PAD_GPIO
+  gb.direct.joypad_bits.up = gpio_get(PIN_UP);
+  gb.direct.joypad_bits.down = gpio_get(PIN_DOWN);
+  gb.direct.joypad_bits.left = gpio_get(PIN_LEFT);
+  gb.direct.joypad_bits.right = gpio_get(PIN_RIGHT);
+  gb.direct.joypad_bits.a = gpio_get(PIN_A);
+  gb.direct.joypad_bits.b = gpio_get(PIN_B);
+  gb.direct.joypad_bits.select = gpio_get(PIN_SELECT);
+  gb.direct.joypad_bits.start = gpio_get(PIN_START);
+#else
+  #if 0
+  Serial.printf("pins:\n");
+  for (int i = 0; i < 8; ++i) {
+    int in = pcf8574.digitalRead(i);
+    Serial.printf(" %d", in);
+  }
+  Serial.printf("\n");
+  #endif
+
+  gb.direct.joypad_bits.up = pcf8574.digitalRead(PIN_UP);
+  gb.direct.joypad_bits.down = pcf8574.digitalRead(PIN_DOWN);
+  gb.direct.joypad_bits.left = pcf8574.digitalRead(PIN_LEFT);
+  gb.direct.joypad_bits.right = pcf8574.digitalRead(PIN_RIGHT);
+  gb.direct.joypad_bits.a = pcf8574.digitalRead(PIN_A);
+  gb.direct.joypad_bits.b = pcf8574.digitalRead(PIN_B);
+  gb.direct.joypad_bits.select = pcf8574.digitalRead(PIN_SELECT);
+  gb.direct.joypad_bits.start = pcf8574.digitalRead(PIN_START);
+#endif
+
+  /* hotkeys (select + * combo)*/
+  if (!gb.direct.joypad_bits.select) {
+#if ENABLE_SOUND
+    if (!gb.direct.joypad_bits.up && prev_joypad_bits.up) {
+      /* select + up: increase sound volume */
+      i2s_increase_volume(&i2s_config);
+    }
+    if (!gb.direct.joypad_bits.down && prev_joypad_bits.down) {
+      /* select + down: decrease sound volume */
+      i2s_decrease_volume(&i2s_config);
+    }
+#endif
+    if (!gb.direct.joypad_bits.right && prev_joypad_bits.right) {
+      /* select + right: select the next manual color palette */
+      nextPalette();
+    }
+    if (!gb.direct.joypad_bits.left && prev_joypad_bits.left) {
+      /* select + left: select the previous manual color palette */
+      prevPalette();
+    }
+    if (!gb.direct.joypad_bits.start && prev_joypad_bits.start) {
+      /* select + start: save ram and resets to the game selection menu */
+#if ENABLE_SDCARD
+      write_cart_ram_file(&gb);
+#endif
+      reset();
+    }
+    if (!gb.direct.joypad_bits.a && prev_joypad_bits.a) {
+      /* select + A: enable/disable frame-skip => fast-forward */
+      gb.direct.frame_skip = !gb.direct.frame_skip;
+      Serial.printf("I gb.direct.frame_skip = %d\n", gb.direct.frame_skip);
+    }
+    if (!gb.direct.joypad_bits.b && prev_joypad_bits.b) {
+      /* select + B: change scaling mode */
+      scalingMode = (ScalingMode)(((int) scalingMode + 1) % ((int) ScalingMode::COUNT));
+      union core_cmd cmd;
+      cmd.cmd = CORE_CMD_IDLE_SET;
+      multicore_fifo_push_blocking(cmd.full);
+      Serial.printf("I Scaling mode: = %d\n", scalingMode);
+    }
+  }
+}

src/input.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <PCF8574.h>
+
+/* GPIO Connections. */
+#ifdef USE_PAD_GPIO
+#define PIN_UP		2
+#define PIN_DOWN	3
+#define PIN_LEFT	4
+#define PIN_RIGHT	5
+#define PIN_A		6
+#define PIN_B		7
+#define PIN_SELECT	8
+#define PIN_START	9
+#else
+#define PIN_UP		0
+#define PIN_DOWN	1
+#define PIN_LEFT	2
+#define PIN_RIGHT	3
+#define PIN_A		5
+#define PIN_B		4
+#define PIN_SELECT	6
+#define PIN_START	7
+#endif
+
+void initJoypad();
+
+void handlePad();
+void handleSerial();

src/lcd_core.cpp

@@ -1,23 +1,21 @@
 #include <TFT_eSPI.h>
 
-#define PEANUT_GB_HEADER_ONLY
+#include "common.h"
-#include "peanut_gb_options.h"
-#include "peanut_gb.h"
 
-// Note: must be included before core
+#define USE_FRAMEBUFFER
-#include "gbcolors.h"
-#include "core.h"
 
 static TFT_eSPI tft = TFT_eSPI();
+#ifdef USE_FRAMEBUFFER
+static TFT_eSprite framebuffer = TFT_eSprite(&tft);
+#else
+static TFT_eSPI& framebuffer = tft;
+#endif
 
 static uint8_t scaledLineOffsetTable[LCD_HEIGHT]; // scaled to 240 lines
 
 /* Pixel data is stored in here. */
 static uint8_t pixels_buffer[LCD_WIDTH];
 
-extern struct gb_s gb;
-extern palette_t palette; // Colour palette
-
 volatile ScalingMode scalingMode = ScalingMode::NORMAL; 
 
 static int lcd_line_busy = 0;
@@ -57,35 +55,54 @@ void lcd_draw_line(struct gb_s* gb, const uint8_t pixels[LCD_WIDTH],
   multicore_fifo_push_blocking(cmd.full);
 }
 
-void lcd_write_pixels_normal(const uint16_t* pixels, uint8_t line, uint_fast16_t nmemb) {
+#ifdef USE_FRAMEBUFFER
-  const uint16_t colOffset = (tft.width() - nmemb) / 2;
+void lcd_pushColors(size_t offset, const uint16_t* pixels, uint_fast16_t count) {
-  const uint16_t lineOffset = (tft.height() - LCD_HEIGHT) / 2;
+  uint16_t* image = (uint16_t*) framebuffer.getPointer();
-  tft.setAddrWindow(colOffset, lineOffset + line, nmemb, 1);
+  memcpy(&image[offset], pixels, count * sizeof(uint16_t));
-  tft.pushColors((uint16_t*) pixels, nmemb, true);
+}
+#else
+void lcd_pushColors(uint16_t colOffset, uint16_t lineOffset, const uint16_t* pixels, uint_fast16_t count) {
+  framebuffer.setAddrWindow(colOffset, lineOffset, count, 1);
+  tft.pushColors((uint16_t*) pixels, count, true);
+}
+#endif
+
+void lcd_write_pixels_normal(const uint16_t* pixels, uint8_t line, uint_fast16_t count) {
+  const uint16_t colOffset = (DISPLAY_WIDTH - count) / 2;
+  const uint16_t screenLineOffset = (DISPLAY_HEIGHT - LCD_HEIGHT) / 2;
+  const uint16_t lineOffset = screenLineOffset + line;
+  lcd_pushColors(lineOffset * DISPLAY_WIDTH + colOffset, pixels, count);
 }
 
-void lcd_write_pixels_stretched(const uint16_t* pixels, uint8_t line, uint_fast16_t nmemb) {
+void lcd_write_pixels_stretched(const uint16_t* pixels, uint8_t line, uint_fast16_t count) {
-  static uint16_t doubledPixels[320];
+  static uint16_t doubledPixels[DISPLAY_WIDTH];
   uint16_t pos = 0;
-  for (int col = 0; col < nmemb; ++col) {
+  for (int col = 0; col < count; ++col) {
     doubledPixels[pos++] = pixels[col];
     doubledPixels[pos++] = pixels[col];
   }
   const uint16_t stretchedWidth = pos;
 
-  uint8_t repeatedLines = IS_REPEATED(line);
+  const uint8_t lineRepeated = IS_REPEATED(line);
-  tft.setAddrWindow(0, scaledLineOffsetTable[line], stretchedWidth, 1);
+  const uint16_t lineOffset = scaledLineOffsetTable[line];
-  tft.pushColors((uint16_t*)doubledPixels, stretchedWidth, true);
+#ifdef USE_FRAMEBUFFER
-  if (repeatedLines) {
+  size_t offset = lineOffset * DISPLAY_WIDTH;
-    tft.setAddrWindow(0, scaledLineOffsetTable[line] + 1, stretchedWidth, 1);
+  lcd_pushColors(offset, doubledPixels, stretchedWidth);
-    tft.pushColors((uint16_t*)doubledPixels, stretchedWidth, true);
+  if (lineRepeated) {
+    lcd_pushColors(offset + DISPLAY_WIDTH, doubledPixels, stretchedWidth);
   }
+#else
+  lcd_pushColors(0, lineOffset, doubledPixels, stretchedWidth);
+  if (lineRepeated) {
+    lcd_pushColors(0, lineOffset, doubledPixels, stretchedWidth);
+  }
+#endif
 }
 
-void lcd_write_pixels_stretched_keep_aspect(const uint16_t* pixels, uint8_t line, uint_fast16_t nmemb) {
+void lcd_write_pixels_stretched_keep_aspect(const uint16_t* pixels, uint8_t line, uint_fast16_t count) {
-  static uint16_t doubledPixels[320];
+  static uint16_t doubledPixels[DISPLAY_WIDTH];
   uint16_t pos = 0;
-  for (int col = 0; col < nmemb; ++col) {
+  for (int col = 0; col < count; ++col) {
     doubledPixels[pos++] = pixels[col];
     if (IS_REPEATED(col)) {
       doubledPixels[pos++] = pixels[col];
@@ -93,15 +110,22 @@ void lcd_write_pixels_stretched_keep_aspect(const uint16_t* pixels, uint8_t line
   }
   const uint16_t stretchedWidth = pos;
 
-  const uint16_t colOffset = (tft.width() - stretchedWidth) / 2;
+  const uint16_t colOffset = (DISPLAY_WIDTH - stretchedWidth) / 2;
  
-  uint8_t repeatedLines = IS_REPEATED(line);
+  uint8_t lineRepeated = IS_REPEATED(line);
-  tft.setAddrWindow(colOffset, scaledLineOffsetTable[line], stretchedWidth, 1);
+  const uint16_t lineOffset = scaledLineOffsetTable[line];
-  tft.pushColors((uint16_t*)doubledPixels, stretchedWidth, true);
+#ifdef USE_FRAMEBUFFER
-  if (repeatedLines) {
+  size_t offset = lineOffset * DISPLAY_WIDTH + colOffset;
-    tft.setAddrWindow(colOffset, scaledLineOffsetTable[line] + 1, stretchedWidth, 1);
+  lcd_pushColors(offset, doubledPixels, stretchedWidth);
-    tft.pushColors((uint16_t*)doubledPixels, stretchedWidth, true);
+  if (lineRepeated) {
+    lcd_pushColors(offset + DISPLAY_WIDTH, doubledPixels, stretchedWidth);
   }
+#else
+  lcd_pushColors(colOffset, lineOffset, doubledPixels, stretchedWidth);
+  if (lineRepeated) {
+    lcd_pushColors(colOffset, lineOffset, doubledPixels, stretchedWidth);
+  }
+#endif
 }
 
 void lcd_write_pixels(const uint16_t* pixels, uint8_t line, uint_fast16_t nmemb) {
@@ -121,16 +145,16 @@ void lcd_write_pixels(const uint16_t* pixels, uint8_t line, uint_fast16_t nmemb)
 }
 
 void lcd_fill(uint16_t color) {
+#ifdef USE_FRAMEBUFFER
+  framebuffer.fillSprite(color);
+#else
   tft.fillScreen(color);
-}
+#endif
-
-void lcd_fill_rect(uint8_t x, uint8_t y, uint8_t w, uint8_t h, uint16_t color) {
-  tft.fillRect(0, 0, tft.width(), tft.height(), TFT_BLACK);
 }
 
 void lcd_text(char* s, uint8_t x, uint8_t y, uint16_t color, uint16_t bgcolor) {
-  tft.setTextColor(TFT_WHITE, TFT_BLACK); // TODO
+  framebuffer.setTextColor(TFT_WHITE, TFT_BLACK); // TODO
-  tft.drawString(s, x, y);
+  framebuffer.drawString(s, x, y);
 }
 
 void core1_lcd_draw_line(const uint_fast8_t line) {
@@ -176,10 +200,12 @@ void core1_init() {
   lcd_init();
 
   /* Clear LCD screen. */
-  lcd_fill(0x0000);
+  lcd_fill(TFT_BLACK);
 
-  /* Set LCD window to DMG size. */
+#ifdef USE_FRAMEBUFFER
-  lcd_fill_rect(31, 16, LCD_WIDTH, LCD_HEIGHT, 0x0000);
+  framebuffer.setColorDepth(16);
+  framebuffer.createSprite(tft.width(), tft.height());
+#endif
 
   calcExtraLineTable();
 

src/main.cpp

@@ -13,9 +13,7 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-// Peanut-GB emulator settings
+#include "gb.h"
-#include "peanut_gb_options.h"
-#include "peanut_gb.h"
 
 /* C Headers */
 #include <stdio.h>
@@ -25,40 +23,19 @@
 /* RP2040 Headers */
 #include <hardware/vreg.h>
 
-#include <PCF8574.h>
-
 /* Project headers */
 #include "hedley.h"
 #include "minigb_apu.h"
 
 // #include "sdcard.h"
-#include "core.h"
+#include "common.h"
 #include "game_bin.h"
 #include "i2s.h"
 
 #define GBCOLOR_HEADER_ONLY
 #include "gbcolors.h"
 
-/* GPIO Connections. */
+#include "input.h"
-#ifdef USE_PAD_GPIO
-#define PIN_UP		2
-#define PIN_DOWN	3
-#define PIN_LEFT	4
-#define PIN_RIGHT	5
-#define PIN_A		6
-#define PIN_B		7
-#define PIN_SELECT	8
-#define PIN_START	9
-#else
-#define PIN_UP		0
-#define PIN_DOWN	1
-#define PIN_LEFT	2
-#define PIN_RIGHT	3
-#define PIN_A		5
-#define PIN_B		4
-#define PIN_SELECT	6
-#define PIN_START	7
-#endif
 
 #if ENABLE_SOUND
 /**
@@ -84,22 +61,10 @@ static unsigned char rom_bank0[65536];
 static uint8_t ram[32768];
 static uint8_t manual_palette_selected = 0;
 
-static PCF8574 pcf8574(0x20, 16, 17);
-
 struct gb_s gb;
 palette_t palette; // Colour palette
 
-static struct
+uint_fast32_t frames = 0;
-{
-  unsigned a : 1;
-  unsigned b : 1;
-  unsigned select : 1;
-  unsigned start : 1;
-  unsigned right : 1;
-  unsigned left : 1;
-  unsigned up : 1;
-  unsigned down : 1;
-} prev_joypad_bits;
 
 #define putstdio(x) write(1, x, strlen(x))
 
@@ -145,14 +110,12 @@ void gb_error(struct gb_s* gb, const enum gb_error_e gb_err, const uint16_t addr
 #endif
 }
 
-void reset();
-
 void startEmulator() {
 #if ENABLE_LCD
 #if ENABLE_SDCARD
   /* ROM File selector */
   lcd_init();
-  lcd_fill(TFT_BLACK); // 0x0000);
+  tft.fillScreen(TFT_BLACK);
   rom_file_selector();
 #endif
 #endif
@@ -204,55 +167,7 @@ void reset() {
   watchdog_reboot(0,0,0);
 }
 
-#ifdef USE_PAD_GPIO
+void overclock() {
-void initJoypad() {
-  gpio_set_function(GPIO_UP, GPIO_FUNC_SIO);
-  gpio_set_function(GPIO_DOWN, GPIO_FUNC_SIO);
-  gpio_set_function(GPIO_LEFT, GPIO_FUNC_SIO);
-  gpio_set_function(GPIO_RIGHT, GPIO_FUNC_SIO);
-  gpio_set_function(GPIO_A, GPIO_FUNC_SIO);
-  gpio_set_function(GPIO_B, GPIO_FUNC_SIO);
-  gpio_set_function(GPIO_SELECT, GPIO_FUNC_SIO);
-  gpio_set_function(GPIO_START, GPIO_FUNC_SIO);
-
-  gpio_set_dir(GPIO_UP, false);
-  gpio_set_dir(GPIO_DOWN, false);
-  gpio_set_dir(GPIO_LEFT, false);
-  gpio_set_dir(GPIO_RIGHT, false);
-  gpio_set_dir(GPIO_A, false);
-  gpio_set_dir(GPIO_B, false);
-  gpio_set_dir(GPIO_SELECT, false);
-  gpio_set_dir(GPIO_START, false);
-
-  gpio_pull_up(GPIO_UP);
-  gpio_pull_up(GPIO_DOWN);
-  gpio_pull_up(GPIO_LEFT);
-  gpio_pull_up(GPIO_RIGHT);
-  gpio_pull_up(GPIO_A);
-  gpio_pull_up(GPIO_B);
-  gpio_pull_up(GPIO_SELECT);
-  gpio_pull_up(GPIO_START);
-}
-#else
-void initJoypad() {
-  for (int pin = 0; pin < 8; ++pin) {
-    pcf8574.pinMode(pin, INPUT_PULLUP);
-  }
-
-  pcf8574.setLatency(5);
-  
-  if (pcf8574.begin()){
-		Serial.println("PCF8574 initialized");
-	}else{
-		Serial.println("PCF8574 initialization failed");
-    while (true) ;
-	}
-}
-#endif
-
-void setup(void) {
-  /* Overclock. */
-  {
   const unsigned vco = 1596 * 1000 * 1000; /* 266MHz */
   const unsigned div1 = 6, div2 = 1;
 
@@ -260,7 +175,10 @@ void setup(void) {
   sleep_ms(2);
   set_sys_clock_pll(vco, div1, div2);
   sleep_ms(2);
-  }
+}
+
+void setup() {
+  overclock();
 
   /* Initialise USB serial connection for debugging. */
   Serial.begin(115200);
@@ -312,181 +230,7 @@ void prevPalette() {
   manual_assign_palette(palette, manual_palette_selected);
 }
 
-void handleSerial(uint_fast32_t& frames) {
-  static uint64_t start_time = time_us_64();
-
-  /* Serial monitor commands */
-  int input = Serial.read();
-  if (input <= 0) {
-    return;
-  }
-
-  switch (input) {
-  case 'i':
-    gb.direct.interlace = !gb.direct.interlace;
-    break;
-
-  case 'f':
-    gb.direct.frame_skip = !gb.direct.frame_skip;
-    break;
-
-  case 'b': {
-    uint64_t end_time;
-    uint32_t diff;
-    uint32_t fps;
-
-    end_time = time_us_64();
-    diff = end_time - start_time;
-    fps = ((uint64_t)frames * 1000 * 1000) / diff;
-    Serial.printf("Frames: %u\n"
-                  "Time: %lu us\n"
-                  "FPS: %lu\n",
-        frames, diff, fps);
-    Serial.flush();
-    frames = 0;
-    start_time = time_us_64();
-    break;
-  }
-
-  case '\n':
-  case '\r': {
-    gb.direct.joypad_bits.start = 0;
-    break;
-  }
-
-  case '\b': {
-    gb.direct.joypad_bits.select = 0;
-    break;
-  }
-
-  case '8': {
-    gb.direct.joypad_bits.up = 0;
-    break;
-  }
-
-  case '2': {
-    gb.direct.joypad_bits.down = 0;
-    break;
-  }
-
-  case '4': {
-    gb.direct.joypad_bits.left = 0;
-    break;
-  }
-
-  case '6': {
-    gb.direct.joypad_bits.right = 0;
-    break;
-  }
-
-  case 'z':
-  case 'w': {
-    gb.direct.joypad_bits.a = 0;
-    break;
-  }
-
-  case 'x': {
-    gb.direct.joypad_bits.b = 0;
-    break;
-  }
-
-  case 'q':
-    reset();
-
-  case 'p':
-    nextPalette();
-
-  default:
-    break;
-  }
-}
-
-void handlePad() {
-  /* Update buttons state */
-  prev_joypad_bits.up = gb.direct.joypad_bits.up;
-  prev_joypad_bits.down = gb.direct.joypad_bits.down;
-  prev_joypad_bits.left = gb.direct.joypad_bits.left;
-  prev_joypad_bits.right = gb.direct.joypad_bits.right;
-  prev_joypad_bits.a = gb.direct.joypad_bits.a;
-  prev_joypad_bits.b = gb.direct.joypad_bits.b;
-  prev_joypad_bits.select = gb.direct.joypad_bits.select;
-  prev_joypad_bits.start = gb.direct.joypad_bits.start;
-
-#ifdef USE_PAD_GPIO
-  gb.direct.joypad_bits.up = gpio_get(PIN_UP);
-  gb.direct.joypad_bits.down = gpio_get(PIN_DOWN);
-  gb.direct.joypad_bits.left = gpio_get(PIN_LEFT);
-  gb.direct.joypad_bits.right = gpio_get(PIN_RIGHT);
-  gb.direct.joypad_bits.a = gpio_get(PIN_A);
-  gb.direct.joypad_bits.b = gpio_get(PIN_B);
-  gb.direct.joypad_bits.select = gpio_get(PIN_SELECT);
-  gb.direct.joypad_bits.start = gpio_get(PIN_START);
-#else
-  #if 0
-  Serial.printf("pins:\n");
-  for (int i = 0; i < 8; ++i) {
-    int in = pcf8574.digitalRead(i);
-    Serial.printf(" %d", in);
-  }
-  Serial.printf("\n");
-  #endif
-
-  gb.direct.joypad_bits.up = pcf8574.digitalRead(PIN_UP);
-  gb.direct.joypad_bits.down = pcf8574.digitalRead(PIN_DOWN);
-  gb.direct.joypad_bits.left = pcf8574.digitalRead(PIN_LEFT);
-  gb.direct.joypad_bits.right = pcf8574.digitalRead(PIN_RIGHT);
-  gb.direct.joypad_bits.a = pcf8574.digitalRead(PIN_A);
-  gb.direct.joypad_bits.b = pcf8574.digitalRead(PIN_B);
-  gb.direct.joypad_bits.select = pcf8574.digitalRead(PIN_SELECT);
-  gb.direct.joypad_bits.start = pcf8574.digitalRead(PIN_START);
-#endif
-
-  /* hotkeys (select + * combo)*/
-  if (!gb.direct.joypad_bits.select) {
-#if ENABLE_SOUND
-    if (!gb.direct.joypad_bits.up && prev_joypad_bits.up) {
-      /* select + up: increase sound volume */
-      i2s_increase_volume(&i2s_config);
-    }
-    if (!gb.direct.joypad_bits.down && prev_joypad_bits.down) {
-      /* select + down: decrease sound volume */
-      i2s_decrease_volume(&i2s_config);
-    }
-#endif
-    if (!gb.direct.joypad_bits.right && prev_joypad_bits.right) {
-      /* select + right: select the next manual color palette */
-      nextPalette();
-    }
-    if (!gb.direct.joypad_bits.left && prev_joypad_bits.left) {
-      /* select + left: select the previous manual color palette */
-      prevPalette();
-    }
-    if (!gb.direct.joypad_bits.start && prev_joypad_bits.start) {
-      /* select + start: save ram and resets to the game selection menu */
-#if ENABLE_SDCARD
-      write_cart_ram_file(&gb);
-#endif
-      reset();
-    }
-    if (!gb.direct.joypad_bits.a && prev_joypad_bits.a) {
-      /* select + A: enable/disable frame-skip => fast-forward */
-      gb.direct.frame_skip = !gb.direct.frame_skip;
-      Serial.printf("I gb.direct.frame_skip = %d\n", gb.direct.frame_skip);
-    }
-    if (!gb.direct.joypad_bits.b && prev_joypad_bits.b) {
-      /* select + B: change scaling mode */
-      scalingMode = (ScalingMode)(((int) scalingMode + 1) % ((int) ScalingMode::COUNT));
-      union core_cmd cmd;
-      cmd.cmd = CORE_CMD_IDLE_SET;
-      multicore_fifo_push_blocking(cmd.full);
-      Serial.printf("I Scaling mode: = %d\n", scalingMode);
-    }
-  }
-}
-
 void loop() {
-  static uint_fast32_t frames = 0;
-
   gb.gb_frame = 0;
 
   do {
@@ -503,5 +247,5 @@ void loop() {
 #endif
 
   handlePad();
-  handleSerial(frames);
+  handleSerial();
 }

src/tft-espi-config/tft_setup.h

@@ -23,14 +23,12 @@
 // Tell the library to use parallel mode (otherwise SPI is assumed)
 //#define TFT_PARALLEL_8_BIT
 #define TFT_PARALLEL_16_BIT // **** 16-bit parallel ONLY for RP2040 processor ****
-
+#define RP2040_PIO_CLK_DIV 4 // 60ns
-// Display type -  only define if RPi display
-//#define RPI_DISPLAY_TYPE // 20MHz maximum SPI
-
-// Only define one driver, the other ones must be commented out
 #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 ST7735_DRIVER
+
 #if 0
 #define ST7789_2_DRIVER    // Minimal configuration option, define additional parameters below for this display
 #define TFT_INVERSION_OFF
@@ -66,7 +64,7 @@
 #define TFT_D7    7
 #define TFT_WR    19      // Write strobe for modified Raspberry Pi TFT only
 #define TFT_DC    20      // Data Command control pin
-#define TFT_CS    21      // Chip select control pin D8
+//#define TFT_CS    21      // 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