add batinfo update and fix the uart setting of chibios

keyboards/yandrstudio/biu_nrf52_ble_lib/biu_nrf52.cpp

@@ -505,7 +505,7 @@ void bluetooth_send_battery_level() {
 
     item.queue_type   = QTBatVMsg;
     item.added        = timer_read();
-    item.bat_lev = cur_bat_lev;
+    item.bat_lev = cur_bat_lev < 5 ? 5 : cur_bat_lev;
     while (!send_buf.enqueue(item)) {
         send_buf_send_one();
     }

keyboards/yandrstudio/biu_nrf52_ble_lib/uart.c

@@ -0,0 +1,50 @@
+/* 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 3 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 <https://www.gnu.org/licenses/>.
+ */
+
+#include "uart.h"
+
+#include "quantum.h"
+
+static SerialConfig serialConfig = {SERIAL_DEFAULT_BITRATE, SD1_CR1, SD1_CR2, SD1_CR3};
+
+void uart_init(uint32_t baud) {
+    static bool is_initialised = false;
+
+    if (!is_initialised) {
+        is_initialised = true;
+
+        serialConfig.speed = baud;
+
+#if defined(USE_GPIOV1)
+        palSetLineMode(SD1_TX_PIN, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
+        palSetLineMode(SD1_RX_PIN, PAL_MODE_STM32_ALTERNATE_OPENDRAIN);
+#else
+        palSetLineMode(SD1_TX_PIN, PAL_MODE_ALTERNATE(SD1_TX_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL);
+        palSetLineMode(SD1_RX_PIN, PAL_MODE_ALTERNATE(SD1_RX_PAL_MODE) | PAL_MODE_INPUT_PULLUP);
+#endif
+        sdStart(&SERIAL_DRIVER, &serialConfig);
+    }
+}
+
+void uart_putchar(uint8_t c) { sdPut(&SERIAL_DRIVER, c); }
+
+uint8_t uart_getchar(void) {
+    msg_t res = sdGet(&SERIAL_DRIVER);
+
+    return (uint8_t)res;
+}
+
+bool uart_available(void) { return !sdGetWouldBlock(&SERIAL_DRIVER); }