2350B GPIO > 30 Not working on custom board

[Greg-Freeman]

I have a custom PCB with a 2350B chip on it. I am seemingly unable to take readings on any GPIO > 30. It is the exact same symptom as those described here, all the way down to the UARTS on GPIO > 30 working.

Now, I did not go through the full process of setting this board up with the makeboards file etc because I was hoping to just keep my setup local to my project. So I created a boards/<name>.json file with the following contents:

{
  "build": {
    "arduino": {
      "earlephilhower": {
        "boot2_source": "none.S",
        "usb_vid": "0x2E8A",
        "usb_pid": "0x000F"
      }
    },
    "core": "earlephilhower",
    "cpu": "cortex-m33",
    "extra_flags": "-DARDUINO_DIRECT_FIT_DISPLAY -DARDUINO_ARCH_RP2040 -DUSBD_MAX_POWER_MA=250 ",
    "f_cpu": "150000000L",
    "hwids": [
      ["0x2E8A", "0x00C0"],
      ["0x2E8A", "0x000F"]
    ],
    "mcu": "rp2350",
    "variant": "direct_fit_display"
  },
  "debug": {
    "jlink_device": "RP2350_0",
    "openocd_target": "rp2350.cfg",
    "svd_path": "rp2350.svd"
  },
  "frameworks": ["arduino"],
  "name": "Direct Fit Display",
  "upload": {
    "maximum_ram_size": 524288,
    "maximum_size": 16777216,
    "require_upload_port": true,
    "native_usb": true,
    "use_1200bps_touch": true,
    "wait_for_upload_port": false,
    "protocol": "picotool",
    "protocols": [
      "blackmagic",
      "cmsis-dap",
      "jlink",
      "raspberrypi-swd",
      "picotool",
      "picoprobe"
    ]
  },
  "url": "",
  "vendor": "Direct Fit"
}

And my pins_arduino.h inside my variants/<name> folder:

#pragma once

#define PICO_RP2350A 0 // RP2350B

#define PINS_COUNT (48u)
#define NUM_DIGITAL_PINS (48u)
#define NUM_ANALOG_INPUTS (8u)
#define NUM_ANALOG_OUTPUTS (0u)
#define ADC_RESOLUTION (12u)

#define PIN_LED (28u)
#define LED_BUILTIN PIN_LED

// Serial
#define PIN_SERIAL1_TX (0u)
#define PIN_SERIAL1_RX (1u)

#define PIN_SERIAL2_TX (40u)
#define PIN_SERIAL2_RX (41u)

// I2C1
#define PIN_WIRE0_SDA (2u)
#define PIN_WIRE0_SCL (3u)

// I2C0 unused
#define PIN_WIRE1_SDA (255u)
#define PIN_WIRE1_SCL (255u)

static const uint8_t D4 = (4u);
static const uint8_t D5 = (5u);
static const uint8_t D6 = (6u);
static const uint8_t D7 = (7u);
static const uint8_t D8 = (8u);
static const uint8_t D9 = (9u);
static const uint8_t D10 = (10u);
static const uint8_t D11 = (11u);
static const uint8_t D12 = (12u);
static const uint8_t D13 = (13u);
static const uint8_t D14 = (14u);
static const uint8_t D15 = (15u);
static const uint8_t D16 = (16u);
static const uint8_t D17 = (17u);
static const uint8_t D18 = (18u);
static const uint8_t D19 = (19u);
static const uint8_t D20 = (20u);
static const uint8_t D21 = (21u);
static const uint8_t D22 = (22u);
static const uint8_t D23 = (23u);
static const uint8_t D24 = (24u);
static const uint8_t D25 = (25u);
static const uint8_t D26 = (26u);
static const uint8_t D27 = (27u);
static const uint8_t D28 = (28u);
static const uint8_t D29 = (29u);
static const uint8_t D30 = (30u);
static const uint8_t D31 = (31u);
static const uint8_t D32 = (32u);
static const uint8_t D33 = (33u);
static const uint8_t D34 = (34u);
static const uint8_t D35 = (35u);
static const uint8_t D36 = (36u);
static const uint8_t D37 = (37u);
static const uint8_t D38 = (38u);
static const uint8_t D39 = (39u);

static const uint8_t D42 = (42u);
static const uint8_t D43 = (43u);
static const uint8_t D44 = (44u);
static const uint8_t D45 = (45u);
static const uint8_t D46 = (46u);
static const uint8_t D47 = (47u);

static const uint8_t A0 = (40u);
static const uint8_t A1 = (41u);
static const uint8_t A2 = (42u);
static const uint8_t A3 = (43u);
static const uint8_t A4 = (44u);
static const uint8_t A5 = (45u);
static const uint8_t A6 = (46u);
static const uint8_t A7 = (47u);

#define SERIAL_HOWMANY (3u)
#define SPI_HOWMANY (0U)
#define WIRE_HOWMANY (2u)

#define WIRE_INTERFACES_COUNT (WIRE_HOWMANY)

I have also tried just a very minimal pins_arduino.h file and including generic/common.h at the bottom, also with no luck.

And my platformio.ini file:

[platformio]
description = Direct Fit Display

[base]
framework = arduino
lib_deps = 
    sparkfun/SparkFun u-blox GNSS v3@^3.1.13
    mikalhart/TinyGPSPlus@^1.1.0
    robtillaart/I2C_EEPROM@^1.9.4
build_flags = 
    -Isrc/styles/src
    -DCMAKE_EXPORT_COMPILE_COMMANDS=ON

[env:pcb]
extends = base
framework = ${base.framework}
platform = https://github.com/maxgerhardt/platform-raspberrypi.git
board = direct_fit_display
board_build.variants_dir = ./variants
board_build.variant = direct_fit_display
lib_deps = 
    ${base.lib_deps}
build_flags = 
    ${base.build_flags}
    -DPCB

I am wondering if there is
a) anything I'm missing or
b) if it's possible the issue is being caused by not going through the full process and having my board defined in the framework folder alongside all the other boards? I can do that, but was trying to avoid it since it's so project-specific. I'd prefer not to fork the entire repo just for my own private board to be created.

It really feels like somehow the board is still being build for a 2350A but all things I see so far point to it being for the B variant.

[Greg-Freeman]

I had an input wired up wrong and it happened to be GPIO 31, and GPIO 30 happened to work. Unfortunately that aligns quite nicely with the pin difference between the A and B variants. So, it was a red herring.