Add an ez_maker directpins for rp2040 (qmk#17908)

* Add an ez_maker directpins for rp2040

This allows all exposed pins on the Raspberry Pi Pico to be used
as up to 26 individual keys. Keys use a common ground arrangement.

The firmware is also expected to work on generic RP2040 boards, check
manufacturer pinout diagrams or use trial and error to find out the GP#s
of the pins.

* Update keyboards/ez_maker/directpins/rp2040/info.json

Co-authored-by: Joel Challis <git@zvecr.com>

* Changes based on review comments

Co-authored-by: Joel Challis <git@zvecr.com>

keyboards/ez_maker/directpins/rp2040/info.json

@@ -0,0 +1,64 @@
+{
+    "manufacturer": "Raspberry Pi",
+    "keyboard_name": "DirectPins RP2040",
+    "maintainer": "jepler",
+    "bootloader": "rp2040",
+    "debounce": 5,
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true
+    },
+    "matrix_pins": {
+        "direct": [
+            ["GP0", null],
+            ["GP1", null],
+
+            ["GP2", null],
+            ["GP3", null],
+            ["GP4", null],
+            ["GP5", "GP28"],
+
+            ["GP6", "GP27"],
+            ["GP7", "GP26"],
+            ["GP8", null],
+            ["GP9", "GP22"],
+
+            ["GP10", "GP21"],
+            ["GP11", "GP20"],
+            ["GP12", "GP19"],
+            ["GP13", "GP18"],
+
+            ["GP14", "GP17"],
+            ["GP15", "GP16"]
+        ]
+    },
+    "processor": "RP2040",
+    "usb": {
+        "device_version": "0.0.1",
+        "pid": "0x2326",
+        "vid": "0xFEED"
+    },
+    "layouts": {
+        "LAYOUT_all": {
+            "layout": [
+                {"label":"GP0", "matrix": [0, 0], "x":0, "y":0},
+                {"label":"GP1", "matrix": [1, 0], "x":0, "y":1},
+                {"label":"GP2", "matrix": [2, 0], "x":0, "y":3},
+                {"label":"GP3", "matrix": [3, 0], "x":0, "y":4},
+                {"label":"GP4", "matrix": [4, 0], "x":0, "y":5},
+                {"label":"GP5", "matrix": [5, 0], "x":0, "y":6}, {"label":"GP28", "matrix": [5, 1], "x":2, "y":6},
+                {"label":"GP6", "matrix": [6, 0], "x":0, "y":8}, {"label":"GP27", "matrix": [6, 1], "x":2, "y":8},
+                {"label":"GP7", "matrix": [7, 0], "x":0, "y":9}, {"label":"GP26", "matrix": [7, 1], "x":2, "y":9},
+                {"label":"GP8", "matrix": [8, 0], "x":0, "y":10},
+                {"label":"GP9", "matrix": [9, 0], "x":0, "y":11}, {"label":"GP22", "matrix": [9, 1], "x":2, "y":11},
+                {"label":"GP10", "matrix": [10, 0], "x":0, "y":13}, {"label":"GP21", "matrix": [10, 1], "x":2, "y":13},
+                {"label":"GP11", "matrix": [11, 0], "x":0, "y":14}, {"label":"GP20", "matrix": [11, 1], "x":2, "y":14},
+                {"label":"GP12", "matrix": [12, 0], "x":0, "y":15}, {"label":"GP19", "matrix": [12, 1], "x":2, "y":15},
+                {"label":"GP13", "matrix": [13, 0], "x":0, "y":16}, {"label":"GP18", "matrix": [13, 1], "x":2, "y":16},
+                {"label":"GP14", "matrix": [14, 0], "x":0, "y":18}, {"label":"GP17", "matrix": [14, 1], "x":2, "y":18},
+                {"label":"GP15", "matrix": [15, 0], "x":0, "y":19}, {"label":"GP16", "matrix": [15, 1], "x":2, "y":19}
+            ]
+        }
+    }
+}

keyboards/ez_maker/directpins/rp2040/keymaps/default/keymap.json

@@ -0,0 +1,25 @@
+{
+    "keyboard": "ez_maker/directpins/rp2040",
+    "keymap": "default",
+    "layout": "LAYOUT_all",
+    "layers": [
+        [
+            "KC_0",
+            "KC_1",
+            "KC_2",
+            "KC_3",
+            "KC_4",
+            "KC_5", "KC_P",
+            "KC_6", "KC_O",
+            "KC_7", "KC_N",
+            "KC_8",
+            "KC_9", "KC_M",
+            "KC_A", "KC_L",
+            "KC_B", "KC_K",
+            "KC_C", "KC_J",
+            "KC_D", "KC_I",
+            "KC_E", "KC_H",
+            "KC_F", "KC_G"
+        ]
+    ]
+}

keyboards/ez_maker/directpins/rp2040/readme.md

@@ -0,0 +1,19 @@
+# DirectPins
+
+![Raspberry Pi Pico pinout guide](https://learn.adafruit.com/getting-started-with-raspberry-pi-pico-circuitpython/pinouts)
+
+Easily assign keys to pins for your custom project using QMK Configurator.
+
+* Keyboard Maintainer: [Jeff Epler](https://github.com/jepler)
+* Hardware Supported: Raspberry Pi Pico, other RP2040 boards
+* Hardware Availability: Raspberry Pi, SparkFun, Adafruit, other makers
+
+Make example for this keyboard (after setting up your build environment):
+
+    qmk compile -kb ez_maker/directpins/rp2040 -km default
+
+Flashing example for this keyboard:
+
+    qmk flash -kb ez_maker/directpins/rp2040 -km default
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).

keyboards/ez_maker/directpins/rp2040/rules.mk

@@ -0,0 +1 @@
+# This file intentionally left blank