Update Raspberry Pi 500 board support for minimal original intent.

- Fix mistake done in pico.h PICO_RP2040_B0_SUPPORTED 0 => 1
- Disable B0 support in pi500_rp2040
- Fix flash size 1M-Bit not 1Mb
- Add Matrix pin definition

src/boards/include/boards/pico.h

@@ -80,7 +80,7 @@ pico_board_cmake_set_default(PICO_FLASH_SIZE_BYTES, (2 * 1024 * 1024))
 #define PICO_SMPS_MODE_PIN 23
 
 #ifndef PICO_RP2040_B0_SUPPORTED
-#define PICO_RP2040_B0_SUPPORTED 0
+#define PICO_RP2040_B0_SUPPORTED 1
 #endif
 
 // The GPIO Pin used to read VBUS to determine if the device is battery powered.

src/boards/include/boards/raspberry_pi_pi500_rp2040.h

@@ -4,11 +4,6 @@
  * SPDX-License-Identifier: BSD-3-Clause
  */
 
-// -----------------------------------------------------
-// NOTE: THIS HEADER IS ALSO INCLUDED BY ASSEMBLER SO
-//       SHOULD ONLY CONSIST OF PREPROCESSOR DIRECTIVES
-// -----------------------------------------------------
-
 #ifndef _BOARDS_RASPBERRY_PI_PI500_RP2040_H
 #define _BOARDS_RASPBERRY_PI_PI500_RP2040_H
 
@@ -17,50 +12,6 @@ pico_board_cmake_set(PICO_PLATFORM, rp2040)
 // For board detection
 #define RASPBERRY_PI_PI500_RP2040
 
-// --- UART ---
-#ifndef PICO_DEFAULT_UART
-#define PICO_DEFAULT_UART 0
-#endif
-#ifndef PICO_DEFAULT_UART_TX_PIN
-#define PICO_DEFAULT_UART_TX_PIN 16  // Pi 500 debug UART on GP16
-#endif
-#ifndef PICO_DEFAULT_UART_RX_PIN
-#define PICO_DEFAULT_UART_RX_PIN 1   // Standard RX pin
-#endif
-
-// --- LED ---
-#ifndef PICO_DEFAULT_LED_PIN
-#define PICO_DEFAULT_LED_PIN 17  // Pi 500 LED on GP17
-#endif
-
-// --- I2C ---
-#ifndef PICO_DEFAULT_I2C
-#define PICO_DEFAULT_I2C 0
-#endif
-#ifndef PICO_DEFAULT_I2C_SDA_PIN
-#define PICO_DEFAULT_I2C_SDA_PIN 4
-#endif
-#ifndef PICO_DEFAULT_I2C_SCL_PIN
-#define PICO_DEFAULT_I2C_SCL_PIN 5
-#endif
-
-// --- SPI ---
-#ifndef PICO_DEFAULT_SPI
-#define PICO_DEFAULT_SPI 0
-#endif
-#ifndef PICO_DEFAULT_SPI_SCK_PIN
-#define PICO_DEFAULT_SPI_SCK_PIN 18
-#endif
-#ifndef PICO_DEFAULT_SPI_TX_PIN
-#define PICO_DEFAULT_SPI_TX_PIN 19
-#endif
-#ifndef PICO_DEFAULT_SPI_RX_PIN
-#define PICO_DEFAULT_SPI_RX_PIN 16
-#endif
-#ifndef PICO_DEFAULT_SPI_CSN_PIN
-#define PICO_DEFAULT_SPI_CSN_PIN 17
-#endif
-
 // --- FLASH ---
 // Pi 500 uses W25X10CL flash (differs from standard Pico W25Q080)
 #define PICO_BOOT_STAGE2_CHOOSE_W25X10CL 1
@@ -69,59 +20,62 @@ pico_board_cmake_set(PICO_PLATFORM, rp2040)
 #define PICO_FLASH_SPI_CLKDIV 2
 #endif
 
-pico_board_cmake_set_default(PICO_FLASH_SIZE_BYTES, (1 * 1024 * 1024))  // 1MB W25X10CL
+pico_board_cmake_set_default(PICO_FLASH_SIZE_BYTES, (128 * 1024))
 #ifndef PICO_FLASH_SIZE_BYTES
-#define PICO_FLASH_SIZE_BYTES (1 * 1024 * 1024)
+#define PICO_FLASH_SIZE_BYTES (128 * 1024)
 #endif
 
-// Drive high to force power supply into PWM mode (lower ripple on 3V3 at light loads)
-#define PICO_SMPS_MODE_PIN 23
-
-#ifndef PICO_RP2040_B0_SUPPORTED
-#define PICO_RP2040_B0_SUPPORTED 1
-#endif
 
-// The GPIO Pin used to read VBUS to determine if the device is battery powered.
-#ifndef PICO_VBUS_PIN
-#define PICO_VBUS_PIN 24
-#endif
 
-// The GPIO Pin used to monitor VSYS. Typically you would use this with ADC.
-#ifndef PICO_VSYS_PIN
-#define PICO_VSYS_PIN 29
+#ifndef PICO_RP2040_B0_SUPPORTED
+#define PICO_RP2040_B0_SUPPORTED 0
 #endif
 
-// --- USB CONFIGURATION ---
-// Crucial for Pi 500 keyboard function when Pi is off - ignores USB startup check
-#define PICO_STDIO_USB_ENABLE_RESET_VIA_VENDOR_INTERFACE 0
-#define PICO_STDIO_USB_RESET_BOOTSEL_ACTIVITY_LED 0
-
-// --- BOOTLOADER CONFIGURATION ---
-// Disable double tap reset timeout for Pi 500
-#define PICO_BOOTSEL_VIA_DOUBLE_RESET_ACTIVITY_LED 0
-
-// --- PI 500 KEYBOARD MATRIX CONFIGURATION ---
-// Complete GPIO pin mapping for 8×18 keyboard matrix
-// Rows (8): GP0, GP1, GP2, GP3, GP4, GP5, GP6, GP7
-// Cols (18): GP27, GP8, GP9, GP10, GP11, GP12, GP13, GP14, GP23, GP24, GP22, GP20, GP29, GP18, GP15, GP21, GP28, GP26
-// Matrix scanning: ROW2COL, no diodes (ghost keys possible with 3+ key combinations)
-
-// --- PI 500 SYSTEM PINS ---
-// These pins are reserved for Pi 500 hardware functions:
-// GP0-GP7: Keyboard matrix rows
-// GP8-GP15: Keyboard matrix columns (partial)
-// GP16: Debug UART TX
-// GP17: LED (heartbeat/debug)
-// GP18: Keyboard matrix column
-// GP19: Power button control (PWR_BTN) - CRITICAL for Pi power management
-// GP20: Power key detection column (separate from matrix)
-// GP21-GP24: Keyboard matrix columns
-// GP25: Caps Lock LED
-// GP26-GP29: Keyboard matrix columns
-
-// --- POWER MANAGEMENT WARNING ---
-// Custom firmware MUST implement power button handling via GP19 or the Pi 500
-// power button will stop working, potentially making the device unbootable.
-// See QMK pi500.c for reference implementation.
+// --- PI 500 KEYBOARD LEDS ---
+// LEDs directly connected to RP2040 (not via FFC)
+#ifndef PICO_DEFAULT_LED_PIN
+#define PICO_DEFAULT_LED_PIN 17  // Power/Status LED
+#endif
+
+// Keyboard indicator LEDs
+#define PI500_RP2040_CAPS_LOCK_LED_PIN 25
+
+// --- PI 500 POWER MANAGEMENT ---
+// Power button control (critical for Pi 500 power management)
+#define PI500_RP2040_POWER_BUTTON_PIN 19
+// Power key detection (shared with matrix pins but scanned separately)
+#define PI500_RP2040_POWER_KEY_COL_PIN 20  // Also matrix col 11
+#define PI500_RP2040_POWER_KEY_ROW_PIN 6   // Also matrix row 6
+
+// --- KEYBOARD MATRIX PINS ---
+// Matrix row pins (8 pins)
+#define PI500_RP2040_MATRIX_ROW_0_PIN 0
+#define PI500_RP2040_MATRIX_ROW_1_PIN 1
+#define PI500_RP2040_MATRIX_ROW_2_PIN 2
+#define PI500_RP2040_MATRIX_ROW_3_PIN 3
+#define PI500_RP2040_MATRIX_ROW_4_PIN 4
+#define PI500_RP2040_MATRIX_ROW_5_PIN 5
+#define PI500_RP2040_MATRIX_ROW_6_PIN 6
+#define PI500_RP2040_MATRIX_ROW_7_PIN 7
+
+// Matrix column pins (18 pins)
+#define PI500_RP2040_MATRIX_COL_0_PIN 27
+#define PI500_RP2040_MATRIX_COL_1_PIN 8
+#define PI500_RP2040_MATRIX_COL_2_PIN 9
+#define PI500_RP2040_MATRIX_COL_3_PIN 10
+#define PI500_RP2040_MATRIX_COL_4_PIN 11
+#define PI500_RP2040_MATRIX_COL_5_PIN 12
+#define PI500_RP2040_MATRIX_COL_6_PIN 13
+#define PI500_RP2040_MATRIX_COL_7_PIN 14
+#define PI500_RP2040_MATRIX_COL_8_PIN 23
+#define PI500_RP2040_MATRIX_COL_9_PIN 24
+#define PI500_RP2040_MATRIX_COL_10_PIN 22
+#define PI500_RP2040_MATRIX_COL_11_PIN 20
+#define PI500_RP2040_MATRIX_COL_12_PIN 29
+#define PI500_RP2040_MATRIX_COL_13_PIN 18
+#define PI500_RP2040_MATRIX_COL_14_PIN 15
+#define PI500_RP2040_MATRIX_COL_15_PIN 21
+#define PI500_RP2040_MATRIX_COL_16_PIN 28
+#define PI500_RP2040_MATRIX_COL_17_PIN 26
 
 #endif