start qwiic keyboard impl

drivers/qwiic/qwiic_keyboard.c

@@ -0,0 +1,118 @@
+/* Copyright 2018 Jack Humbert
+ *
+ * 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/>.
+ */
+
+#include "qwiic_keyboard.h"
+#include "keymap.h"
+#include "matrix.h"
+
+#define QWIIC_KEYBOARD_LAYERS 16
+#define QWIIC_KEYBOARD_ROWS 8
+#define QWIIC_KEYBOARD_COLS 8
+
+#define QWIIC_KEYBOARD_HANDSHAKE_ADDRESS 0b01010100
+#define QWIIC_KEYBOARD_LISTENING_ADDRESS_START 0b01010110
+#define QWIIC_KEYBOARD_HANDSHAKE_MESSAGE_SIZE (2 + (QWIIC_KEYBOARD_LAYERS * QWIIC_KEYBOARD_ROWS * QWIIC_KEYBOARD_COLS))
+#define QWIIC_KEYBOARD_MATRIX_MESSAGE_SIZE MATRIX_ROWS
+
+bool qwiic_keyboard_master = false;
+bool qwiic_keyboard_connected = false;
+uint8_t * qwiic_keyboard_handshake_message = {0};
+uint8_t * qwiic_keyboard_matrix_message[QWIIC_KEYBOARD_ROWS] = {0};
+
+uint16_t qwiic_keyboard_keymap[QWIIC_KEYBOARD_LAYERS][QWIIC_KEYBOARD_ROWS][QWIIC_KEYBOARD_COLS] = {0};
+uint8_t qwiic_keyboard_new_listening_address = QWIIC_KEYBOARD_LISTENING_ADDRESS_START;
+uint8_t qwiic_keyboard_listening_address = QWIIC_KEYBOARD_LISTENING_ADDRESS_START;
+uint8_t qwiic_keyboard_matrix_rows;
+uint8_t qwiic_keyboard_matrix_cols;
+
+void qwiic_keyboard_setup(void) {
+  twi2c_start_listening(qwiic_keyboard_listening_address, qwiic_keyboard_message_received);
+}
+
+void qwiic_keyboard_set_master() {
+  twi2c_stop();
+  qwiic_keyboard_master = true;
+}
+
+void qwiic_keyboard_task(void) {
+  if (qwiic_keyboard_master) {
+    if (qwiic_keyboard_connected) {
+      if (MSG_OK == twi2c_transmit_receive(qwiic_keyboard_listening_address,
+        NULL, 0,
+        qwiic_keyboard_matrix_message, QWIIC_KEYBOARD_MATRIX_MESSAGE_SIZE
+      )) {
+        // process key event
+      } else {
+        // disconnect
+      }
+    }
+    if (MSG_OK == twi2c_transmit_receive(QWIIC_KEYBOARD_HANDSHAKE_ADDRESS,
+      qwiic_keyboard_new_listening_address, 1,
+      qwiic_keyboard_handshake_message, QWIIC_KEYBOARD_HANDSHAKE_MESSAGE_SIZE
+    )) {
+      qwiic_keyboard_new_listening_address+=2;
+      uint8_t * message_pointer = qwiic_keyboard_handshake_message;
+      qwiic_keyboard_matrix_rows = *message_pointer++;
+      qwiic_keyboard_matrix_cols = *message_pointer++;
+      qwiic_keyboard_read_keymap(message_pointer);
+    }
+  }
+}
+
+twi2c_message_received qwiic_keyboard_message_received;
+extern matrix_row_t matrix[MATRIX_ROWS];
+uint8_t * qwiic_keyboard_reply;
+
+void qwiic_keyboard_message_received(uint8_t * body, uint16_t size) {
+  if (qwiic_keyboard_connected) {
+    memcpy(qwiic_keyboard_reply, matrix, QWIIC_KEYBOARD_MATRIX_MESSAGE_SIZE);
+    twi2c_reply(qwiic_keyboard_reply, QWIIC_KEYBOARD_MATRIX_MESSAGE_SIZE);
+  } else {
+    qwiic_keyboard_connected = true;
+    qwiic_keyboard_listening_address
+    uint8_t * message_pointer = qwiic_keyboard_reply;
+    *message_pointer++ = MATRIX_ROWS;
+    *message_pointer++ = MATRIX_COLS;
+    qwiic_keyboard_write_keymap(message_pointer);
+    twi2c_reply(qwiic_keyboard_reply, QWIIC_KEYBOARD_HANDSHAKE_MESSAGE_SIZE);
+    twi2c_stop();
+    twi2c_start_listening(qwiic_keyboard_listening_address, qwiic_keyboard_message_received);
+  }
+}
+
+void qwiic_keyboard_write_keymap(uint8_t * pointer) {
+  for (uint8_t layer = 0; layer < QWIIC_KEYBOARD_LAYERS; layer++) {
+    for (uint8_t row = 0; row < QWIIC_KEYBOARD_ROWS; row++) {
+      for (uint8_t col = 0; col < QWIIC_KEYBOARD_COLS; col++) {
+        uint16_t keycode = pgm_read_word(&keymaps[layer][row][col]);
+        *pointer++ = (keycode >> 8);
+        *pointer++ = (keycode & 0xFF);
+      }
+    }
+  }
+}
+
+void qwiic_keyboard_read_keymap(uint8_t * pointer) {
+  for (uint8_t layer = 0; layer < QWIIC_KEYBOARD_LAYERS; layer++) {
+    for (uint8_t row = 0; row < QWIIC_KEYBOARD_ROWS; row++) {
+      for (uint8_t col = 0; col < QWIIC_KEYBOARD_COLS; col++) {
+        uint16_t keycode = *pointer++;
+        keycode |= (*pointer++) << 8;
+        qwiic_keyboard_keymap[layer][row][col] = keycode;
+      }
+    }
+  }
+}