Basic keymap mapping.

src/keymap.h

@@ -0,0 +1,21 @@
+#ifndef ZMK_KEYMAP_H
+#define ZMK_KEYMAP_H
+
+#include <devicetree.h>
+#include <usb/usb_device.h>
+#include <usb/class/usb_hid.h>
+
+// TODO: Pull these in fro a kscan_gpio.h file from Zephyr!
+//
+#define MATRIX_NODE_ID DT_PATH(kscan)
+#define MATRIX_ROWS DT_PROP_LEN(MATRIX_NODE_ID,row_gpios)
+#define MATRIX_COLS DT_PROP_LEN(MATRIX_NODE_ID,col_gpios)
+
+enum hid_kbd_code keymap[MATRIX_ROWS][MATRIX_COLS] = {
+	{ HID_KEY_A, HID_KEY_B },
+	{ HID_KEY_C, HID_KEY_D }
+};
+
+#define zmk_keymap_keycode_from_position(row, column) keymap[row][column]
+
+#endif

src/kscan.c

@@ -11,6 +11,8 @@
 
 LOG_MODULE_REGISTER(zmk_kscan, CONFIG_ZMK_KSCAN_LOG_LEVEL);
 
+#include "keymap.h"
+
 #define ZMK_KSCAN_EVENT_STATE_PRESSED 0
 #define ZMK_KSCAN_EVENT_STATE_RELEASED 1
 
@@ -45,6 +47,8 @@ void zmk_kscan_process_msgq(struct k_work *item)
 
 	while(k_msgq_get(&zmk_kscan_msgq, &ev, K_NO_WAIT) == 0) {
 		bool pressed = (ev.state == ZMK_KSCAN_EVENT_STATE_PRESSED);
+		// TODO: More than basic mapping, layers, etc.
+		enum hid_kbd_code code = zmk_keymap_keycode_from_position(ev.row, ev.column);
 		printk("Row: %d, col: %d, pressed: %s\n", ev.row, ev.column, (pressed ? "true" : "false"));
 	}
 }