Add Contra shield (#633)

* Add Contra Shield (#1)

* Add bluetooth control layer to contra keymap (#2)

* fix contra keymap issues

* add bluetooth control layer

* clean up contra files

* add contra.conf file

* add missing bracket for default_layer

* update copyright year to 2021

* add contra metadata file

* refactor pro micro overlay for new syntax

app/boards/shields/contra/Kconfig.defconfig

@@ -0,0 +1,9 @@
+# Copyright (c) 2021 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+if SHIELD_CONTRA
+
+config ZMK_KEYBOARD_NAME
+    default "Contra Keyboard"
+
+endif

app/boards/shields/contra/Kconfig.shield

@@ -0,0 +1,5 @@
+# Copyright (c) 2021 The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+config SHIELD_CONTRA
+	def_bool $(shields_list_contains,contra)

app/boards/shields/contra/contra.keymap

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <behaviors.dtsi>
+#include <dt-bindings/zmk/keys.h>
+#include <dt-bindings/zmk/bt.h>
+
+#define DEFAULT  0
+#define NUM_MODS 1
+#define BT_CTRL  2
+
+/ {
+    keymap {
+        compatible = "zmk,keymap";
+
+        default_layer {
+            bindings = <
+    &kp ESC   &kp Q     &kp W    &kp E     &kp R       &kp T      &kp Y     &kp U        &kp I     &kp O     &kp P    &kp BSPC
+    &kp TAB   &kp A     &kp S    &kp D     &kp F       &kp G      &kp H     &kp J        &kp K     &kp L     &kp SEMI &kp SQT
+    &kp LSHFT &kp Z     &kp X    &kp C     &kp V       &kp B      &kp N     &kp M        &kp COMMA &kp DOT   &kp FSLH &kp ENTER
+    &kp LCTRL &kp LGUI  &kp LALT &kp BSLH  &to DEFAULT &kp SPACE  &trans    &to NUM_MODS &kp LEFT  &kp RIGHT &kp UP   &kp DOWN
+            >;
+        };
+
+        num_mods {
+            bindings = <
+    &kp GRAVE &kp N1    &kp N2   &kp N3   &kp N4      &kp N5     &kp N6    &kp N7      &kp N8    &kp N9    &kp N0   &kp DEL
+    &kp TAB   &kp F1    &kp F2   &kp F3   &kp F4      &kp F5     &kp F6    &kp MINUS   &kp PG_UP &kp LBKT  &kp RBKT &kp BSLH
+    &kp LSHFT &kp F7    &kp F8   &kp F9   &kp F10     &kp F11    &kp F12   &kp EQUAL   &kp PG_DN &kp HOME  &kp END  &kp ENTER
+    &kp LCTRL &kp LGUI  &kp LALT &reset   &to DEFAULT &kp SPACE  &trans    &mo BT_CTRL &kp LEFT  &kp RIGHT &kp UP   &kp DOWN
+            >;
+        };
+
+        bt_control {
+            bindings = <
+    &bt BT_CLR &bt BT_SEL 0 &bt BT_SEL 1 &bt BT_SEL 2 &bt BT_SEL 3 &bt BT_SEL 4 &trans    &trans    &trans     &trans     &trans   &trans
+    &trans     &trans       &trans       &trans       &trans       &trans       &trans    &trans    &trans     &trans     &trans   &trans
+    &trans     &trans       &trans       &trans       &trans       &trans       &trans    &trans    &trans     &trans     &trans   &trans
+    &trans     &trans       &trans       &trans       &trans       &trans       &trans    &trans    &bt BT_PRV &bt BT_NXT &trans   &trans
+            >;
+        };
+    };
+};

app/boards/shields/contra/contra.overlay

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2021 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/ {
+    chosen {
+        zmk,kscan = &kscan0;
+    };
+
+    kscan0: kscan_0 {
+        compatible = "zmk,kscan-gpio-matrix";
+        label = "KSCAN";
+        diode-direction = "col2row";
+
+        col-gpios
+            = <&pro_micro 21 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 20 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 9 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 8 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 7 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 6 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 5 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 4 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 3 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 2 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 0 GPIO_ACTIVE_HIGH>
+            , <&pro_micro 1 GPIO_ACTIVE_HIGH>
+            ;
+
+        row-gpios
+            = <&pro_micro 19 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            , <&pro_micro 14 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            , <&pro_micro 16 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            , <&pro_micro 10 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>
+            ;
+    };
+};

app/boards/shields/contra/contra.zmk.yml

@@ -0,0 +1,8 @@
+file_format: "1"
+id: contra
+name: Contra
+type: shield
+url: https://github.com/ai03-2725/Contra
+requires: [pro_micro]
+features:
+  - keys