TYBLE16 will become mbed chip! You can compile as a BBC micro:bit on the mbed (not mbed-os5).

Dependencies:   TextLCD mbed

Please see follows.
/users/kenjiArai/notebook/tyble16-module-will-become-a-mbed-family--mbedliza/#

Revision:
0:64039a43c2e1
diff -r 000000000000 -r 64039a43c2e1 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Oct 29 03:46:59 2017 +0000
@@ -0,0 +1,59 @@
+/*
+ * Mbed Application program / Using Akizuki BLE Module AE-TYBLE16
+ *      on-board module : TAIYO YUDEN BLE 4.2 TYSA-B (EYSGJNAWY-WX)
+ *
+ *  http://akizukidenshi.com/catalog/g/gK-12339/
+ *
+ * Copyright (c) 2017 Kenji Arai / JH1PJL
+ *  http://www.page.sannet.ne.jp/kenjia/index.html
+ *  http://mbed.org/users/kenjiArai/
+ *      Created:    October   29th, 2017
+ *      Revised:    October   29th, 2017
+ */
+
+//  Include --------------------------------------------------------------------
+#include "mbed.h"
+#include "TextLCD.h"
+
+//  Definition -----------------------------------------------------------------
+
+//  Object/ Constructor --------------------------------------------------------
+Serial      pc(P0_1, P0_3);
+DigitalOut  led(P0_5);
+I2C         i2c(P0_0, P0_2);
+TextLCD_I2C_N   lcd(&i2c, 0x7c, TextLCD::LCD16x2);  // LCD(Akizuki  AQM1602A)
+
+//  RAM ------------------------------------------------------------------------
+
+//  ROM / Constant data --------------------------------------------------------
+
+//  Function prototypes --------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//  Control Program
+//------------------------------------------------------------------------------
+int main()
+{                    // 1234567890123456
+    char lcd_buf[20] = "by K.Arai/JH1PJL";
+    uint32_t n = 0;
+
+    pc.printf("\r\n\r\nApplication for AE-TYBLE16 Module\r\n");
+    pc.printf("  created on %s %s (UTC)\r\n", __DATE__, __TIME__);
+    // lcd
+    lcd.locate(0, 0);       // 1st line top
+    lcd.puts("1234567890123456");
+    lcd.locate(0, 1);       // 2nd line top
+    lcd.printf("%s", lcd_buf);
+    lcd.setCursor(TextLCD_Base::CurOff_BlkOff);
+    lcd.setContrast(0x1b);  // for AE-AQM1602A
+    wait(5.0f);
+    while (true){
+        sprintf(lcd_buf, "passed %5d sec", n++);
+        pc.printf(" %sonds\r\n", lcd_buf);
+        lcd.locate(0, 0);   // 1st line
+        lcd.printf("%s", lcd_buf);
+        led = !led;
+        wait(1.0f);
+    }
+}
+