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-rw-r--r--keyboards/ploopyco/trackball_thumb/rev1_001/config.h24
-rw-r--r--keyboards/ploopyco/trackball_thumb/trackball_thumb.c13
2 files changed, 37 insertions, 0 deletions
diff --git a/keyboards/ploopyco/trackball_thumb/rev1_001/config.h b/keyboards/ploopyco/trackball_thumb/rev1_001/config.h
new file mode 100644
index 0000000000..a648e8e8e4
--- /dev/null
+++ b/keyboards/ploopyco/trackball_thumb/rev1_001/config.h
@@ -0,0 +1,24 @@
+/* Copyright 2021 Colin Lam (Ploopy Corporation)
+ * Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
+ * Copyright 2019 Sunjun Kim
+ *
+ * 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
+
+// These pins are not broken out, and cannot be used normally.
+// They are set as output and pulled high, by default
+#define UNUSABLE_PINS \
+ { D1, D3, B4, B7, D6, C7, F6, F5, F3, F7 }
diff --git a/keyboards/ploopyco/trackball_thumb/trackball_thumb.c b/keyboards/ploopyco/trackball_thumb/trackball_thumb.c
index 4a90ced8eb..bbc782da45 100644
--- a/keyboards/ploopyco/trackball_thumb/trackball_thumb.c
+++ b/keyboards/ploopyco/trackball_thumb/trackball_thumb.c
@@ -188,6 +188,19 @@ void keyboard_pre_init_kb(void) {
setPinInput(OPT_ENC1);
setPinInput(OPT_ENC2);
+ /* Ground all output pins connected to ground. This provides additional
+ * pathways to ground. If you're messing with this, know this: driving ANY
+ * of these pins high will cause a short. On the MCU. Ka-blooey.
+ */
+#ifdef UNUSABLE_PINS
+ const pin_t unused_pins[] = UNUSABLE_PINS;
+
+ for (uint8_t i = 0; i < (sizeof(unused_pins) / sizeof(pin_t)); i++) {
+ setPinOutput(unused_pins[i]);
+ writePinLow(unused_pins[i]);
+ }
+#endif
+
// This is the debug LED.
#if defined(DEBUG_LED_PIN)
setPinOutput(DEBUG_LED_PIN);