Arduino board run on Mbed-os6.8.1 (only test purpose not official). Need Mbed Studio(1.3.1) not online compiler. If you compile on the online compiler, you can get a hex file but it does NOT work!!!

Dependencies:   APDS_9960 LPS22HB LSM9DS1 HTS221

1) DAPLink(LPC11U35)の準備
使用したボード →https://akizukidenshi.com/catalog/g/gK-12144/
プログラムは、nRF52840-MDK用に公開されているDAPLinkのコンパイル済のバイナリコードを使わせていただきました。
https://github.com/makerdiary/nrf52840-mdk/tree/master/firmware/daplink
LPC11U35への書込みは、SW1(ISP)を押したままSW2(RESET)を操作するとPCに「CRP DISABLD」という名称でマウントされるので、書込まれているfirmware.binを削除してから、上記のbinファイルをコピーすれば書き込みが行われます。
書込み完了後にSW1を押さずに起動すれば、「DAPLINK」として認識されます。
DETAILS.TXTでDAPLinkの内容を確認できます。

2) 接続

Arduino Nano 33 BLE SenseLPC11U35 Interface CPUコメント
J3:Pin2 (ボード裏のパッド)CN1:Pin3 P0_7SWDIO
J3:Pin3 (ボード裏のパッド)CN1:Pin4 P0_8SWCLK
JP2:Pin14  GNDCN2:Pin1 GNDGND

https://os.mbed.com/media/uploads/kenjiArai/snano_daplink.jpg https://os.mbed.com/media/uploads/kenjiArai/snano33ble_bottom.jpg
3)USBSerial
シリアル出力は、NANO 33 BLE SENSEボードのUSB端子経由で出力されます。

4)Mbed Studio 1.3.1を使って開発のこと!(オンラインコンパイラでは動作しません!)
https://os.mbed.com/media/uploads/kenjiArai/s1_2020-02-13.png https://os.mbed.com/media/uploads/kenjiArai/s2_2020-02-13.png

5)ボードピン配置 https://os.mbed.com/media/uploads/kenjiArai/nano33ble_pin.png

Revision:
1:cce280da16d4
Parent:
0:f1a10797d9f6
--- a/4_check_HTS221/main4.cpp	Fri Feb 07 01:21:16 2020 +0000
+++ b/4_check_HTS221/main4.cpp	Sun Feb 28 07:31:58 2021 +0000
@@ -1,14 +1,14 @@
 /*
  * Mbed Application program
- *  Nano 33 BLE Sense board runs on mbed-OS5
+ *  Nano 33 BLE Sense board runs on mbed-OS6
  *  HTS221 -> Capacitive digital sensor for relative humidity and temperature
  *      by STMicroelectronics
  *
- * Copyright (c) 2020 Kenji Arai / JH1PJL
+ * Copyright (c) 2020,'21 Kenji Arai / JH1PJL
  *      http://www7b.biglobe.ne.jp/~kenjia/
  *      https://os.mbed.com/users/kenjiArai/
  *      Started:    January   22nd, 2020
- *      Revised:    Feburary   5th, 2020
+ *      Revised:    February  28th, 2021
  */
 
 //  Pre-selection --------------------------------------------------------------
@@ -24,7 +24,6 @@
 //  Definition -----------------------------------------------------------------
 
 //  Constructor ----------------------------------------------------------------
-RawSerial       pc(STDIO_UART_TX, STDIO_UART_RX, 115200);
 DigitalOut      sen_pwr(PIN_VDD_ENV, 1);
 DigitalOut      i2c_pullup(PIN_I2C_PULLUP, 1);
 I2C             i2c(PIN_SDA1, PIN_SCL1);
@@ -36,7 +35,11 @@
 //  ROM / Constant data --------------------------------------------------------
 
 //  Function prototypes --------------------------------------------------------
-extern void check_i2c_connected_devices(void);
+
+//  subroutin (must be at this below line and do NOT change order) -------------
+#include    "usb_serial_as_stdio.h"
+#include    "check_revision.h"
+#include    "common.h"
 
 //------------------------------------------------------------------------------
 //  Control Program
@@ -45,19 +48,21 @@
 {
     HTS221::HTS221_data_t   hum_data;
 
+    usb_serial_initialize();
+    print_revision();
     i2c_pullup = 1;
     sen_pwr = 1;
-    pc.printf("\r\nCheck LSM9DS1\r\n");
-    thread_sleep_for(200);
+    print_usb("Check LSM9DS1\r\n");
+    ThisThread::sleep_for(200ms);
     //  check I2C line
     check_i2c_connected_devices();
     hum = new HTS221(PIN_SDA1, PIN_SCL1,HTS221::HTS221_ADDRESS, 400000);
     hum->HTS221_GetDeviceID (&hum_data);
     uint8_t id = hum_data.deviceID;
     if (id == HTS221::WHO_AM_I_VALUE) {
-        pc.printf("HTS221 is ready. ID = 0x%x\r\n", id);
+        print_usb("HTS221 is ready. ID = 0x%x\r\n", id);
     } else {
-        pc.printf("HTS221 is NOT ready. return value = 0x%x\r\n", id);
+        print_usb("HTS221 is NOT ready. return value = 0x%x\r\n", id);
     }
     uint32_t n = 0;
     while(true) {
@@ -71,13 +76,14 @@
         hum->HTS221_GetCalibrationCoefficients (&hum_data);
         hum->HTS221_GetTemperature(&hum_data);
         hum->HTS221_GetHumidity(&hum_data);
-        pc.printf("Temperature: %0.1f [degC], RH: %0.1f [%%], ",
+        print_usb("Temperature:,%0.1f,[degC],RH:,%0.1f,[%%],",
                     hum_data.temperature, hum_data.humidity);
         ++n;
-        uint32_t passed_time = t.read_ms();
-        pc.printf("processing time: %d [ms], count: %4d\r\n", passed_time, n);
+        uint32_t passed_time = chrono::duration_cast<chrono::milliseconds>(
+                               t.elapsed_time()).count();
+        print_usb("processing time:,%2d,[ms],count:,%4d\r\n", passed_time, n);
         if (passed_time < 999){
-            thread_sleep_for(1000 - t.read_ms());
+            ThisThread::sleep_for(chrono::milliseconds(1000 - passed_time));
         }
     }
 }