add trackball test code for promicro

keyboards/scda/promicro_trackball/README.md

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+# DirectPins
+
+![Promicro Pinout Guide](https://i.imgur.com/LZ194Hf.jpg)
+
+copy of the [ez_maker/directpins/promicro keyboard](https://github.com/qmk/qmk_firmware/tree/b2ded61796aee1f705a222e229c5b55416d93dd0/keyboards/ez_maker/directpins/promicro)
+
+-   Compile: `qmk compile -kb scda/promicro_trackball -km default`
+-   Flash: `qmk flash -kb scda/promicro_trackball -km default`
+
+HW setup:
+
+-   current config requires the following pimoroni board connections
+
+| trackball | promicro         | notes                                       |
+| --------- | ---------------- | ------------------------------------------- |
+| GND       | GND              |
+| 3.5V      | VCC              |
+| SDA       | SDA / pin 2 / D1 | can be configured as `pin_a` in `info.json` |
+| SCL       | SCL / pin 3 / D0 | can be configured as `pin_b` in `info.json` |
+| INT       | unknown          | still to figure out                         |

keyboards/scda/promicro_trackball/config.h

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+/*
+Copyright 2021 CapsUnlocked
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#pragma once
+
+
+#define POINTING_DEVICE_ROTATION_90
+
+#ifndef PIMORONI_TRACKBALL_ADDRESS
+#    define PIMORONI_TRACKBALL_ADDRESS 0x0A
+#endif

keyboards/scda/promicro_trackball/info.json

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+{
+    "manufacturer": "me",
+    "keyboard_name": "DirectPins ProMicro",
+    "maintainer": "scda",
+    "development_board": "promicro",
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true
+    },
+    "matrix_pins": {
+        "direct": [
+            ["D3", null],
+            ["D2", null],
+            [null, "F4"],
+            [null, "F5"],
+            ["D4", "F6"],
+            ["C6", "F7"],
+            ["D7", "B1"],
+            ["E6", "B3"],
+            ["B4", "B2"],
+            ["B5", null]
+        ]
+    },
+    "usb": {
+        "device_version": "0.0.1",
+        "pid": "0x2320",
+        "vid": "0xFEED"
+    },
+    "encoder": {
+        "rotary": [
+            {"pin_a": "D1", "pin_b": "D0"}
+        ]
+    },
+    "layouts": {
+        "LAYOUT_all": {
+            "layout": [
+                {"label": "D3", "matrix": [0, 0], "x": 0, "y": 0},
+                {"label": "D2", "matrix": [1, 0], "x": 0, "y": 1},
+                                                                    {"label": "F4", "matrix": [2, 1], "x": 2, "y": 4},
+                                                                    {"label": "F5", "matrix": [3, 1], "x": 2, "y": 5},
+                {"label": "D4", "matrix": [4, 0], "x": 0, "y": 6},  {"label": "F6", "matrix": [4, 1], "x": 2, "y": 6},
+                {"label": "C6", "matrix": [5, 0], "x": 0, "y": 7},  {"label": "F7", "matrix": [5, 1], "x": 2, "y": 7},
+                {"label": "D7", "matrix": [6, 0], "x": 0, "y": 8},  {"label": "B1", "matrix": [6, 1], "x": 2, "y": 8},
+                {"label": "E6", "matrix": [7, 0], "x": 0, "y": 9},  {"label": "B3", "matrix": [7, 1], "x": 2, "y": 9},
+                {"label": "B4", "matrix": [8, 0], "x": 0, "y": 10}, {"label": "B2", "matrix": [8, 1], "x": 2, "y": 10},
+                {"label": "B5", "matrix": [9, 0], "x": 0, "y": 11}
+            ]
+        }
+    }
+}

keyboards/scda/promicro_trackball/keymaps/default/keymap.json

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+{
+    "keyboard": "ez_maker/directpins/promicro",
+    "keymap": "default",
+    "layout": "LAYOUT_all",
+    "layers": [
+        [
+            "KC_0",
+            "KC_1",
+                    "KC_3",
+                    "KC_5",
+            "KC_6", "KC_7",
+            "KC_8", "KC_9",
+            "KC_A", "KC_B",
+            "KC_C", "KC_D",
+            "KC_E", "KC_F",
+            "KC_G"
+        ]
+    ]
+}

keyboards/scda/promicro_trackball/rules.mk

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+# This file intentionally left blank
+POINTING_DEVICE_DRIVER = pimoroni_trackball
+POINTING_DEVICE_ENABLE = yes