Migrate RN42 to UART driver and refactor (#15492)

drivers/bluetooth/rn42.c

@@ -0,0 +1,101 @@
+/* Copyright 2021
+ *
+ * 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 "report.h"
+#include "uart.h"
+
+#ifndef RN42_BAUD_RATE
+#    define RN42_BAUD_RATE 115200
+#endif
+
+// https://cdn.sparkfun.com/datasheets/Wireless/Bluetooth/bluetooth_cr_UG-v1.0r.pdf#G7.663734
+static inline uint16_t rn42_consumer_usage_to_bitmap(uint16_t usage) {
+    switch (usage) {
+        case AC_HOME:
+            return 0x0001;
+        case AL_EMAIL:
+            return 0x0002;
+        case AC_SEARCH:
+            return 0x0004;
+        case AL_KEYBOARD_LAYOUT:
+            return 0x0008;
+        case AUDIO_VOL_UP:
+            return 0x0010;
+        case AUDIO_VOL_DOWN:
+            return 0x0020;
+        case AUDIO_MUTE:
+            return 0x0040;
+        case TRANSPORT_PLAY_PAUSE:
+            return 0x0080;
+        case TRANSPORT_NEXT_TRACK:
+            return 0x0100;
+        case TRANSPORT_PREV_TRACK:
+            return 0x0200;
+        case TRANSPORT_STOP:
+            return 0x0400;
+        case TRANSPORT_EJECT:
+            return 0x0800;
+        case TRANSPORT_FAST_FORWARD:
+            return 0x1000;
+        case TRANSPORT_REWIND:
+            return 0x2000;
+        case TRANSPORT_STOP_EJECT:
+            return 0x4000;
+        case AL_LOCAL_BROWSER:
+            return 0x8000;
+        default:
+            return 0;
+    }
+}
+
+void rn42_init(void) {
+    uart_init(RN42_BAUD_RATE);
+}
+
+void rn42_send_keyboard(report_keyboard_t *report) {
+    uart_write(0xFD);
+    uart_write(0x09);
+    uart_write(0x01);
+    uart_write(report->mods);
+    uart_write(0x00);
+    for (uint8_t i = 0; i < KEYBOARD_REPORT_KEYS; i++) {
+        uart_write(report->keys[i]);
+    }
+}
+
+void rn42_send_mouse(report_mouse_t *report) {
+    uart_write(0xFD);
+    uart_write(0x00);
+    uart_write(0x03);
+    uart_write(report->buttons);
+    uart_write(report->x);
+    uart_write(report->y);
+    uart_write(report->v);  // should try sending the wheel v here
+    uart_write(report->h);  // should try sending the wheel h here
+    uart_write(0x00);
+}
+
+void rn42_send_consumer(uint16_t data) {
+    static uint16_t last_data = 0;
+    if (data == last_data) return;
+    last_data       = data;
+    uint16_t bitmap = rn42_consumer_usage_to_bitmap(data);
+    uart_write(0xFD);
+    uart_write(0x03);
+    uart_write(0x03);
+    uart_write(bitmap & 0xFF);
+    uart_write((bitmap >> 8) & 0xFF);
+}