NuMaker tickless example

Revision:
19:adb1816661ee
Parent:
18:e236110ce841
Child:
22:59740ecd1781
--- a/mbed_app.json	Fri Feb 21 17:52:25 2020 +0800
+++ b/mbed_app.json	Tue Feb 25 17:18:02 2020 +0800
@@ -33,6 +33,13 @@
             "target.gpio-irq-debounce-clock-source": "GPIO_DBCTL_DBCLKSRC_LIRC",
             "target.gpio-irq-debounce-sample-rate": "GPIO_DBCTL_DBCLKSEL_16"
         },
+        "NUMAKER_IOT_M487": {
+            "target.macros_add": ["MBED_TICKLESS"],
+            "target.tickless-from-us-ticker": false,
+            "target.gpio-irq-debounce-enable-list": "SW2, SW3",
+            "target.gpio-irq-debounce-clock-source": "GPIO_DBCTL_DBCLKSRC_LIRC",
+            "target.gpio-irq-debounce-sample-rate": "GPIO_DBCTL_DBCLKSEL_16"
+        },
         "NUMAKER_IOT_M263A": {
             "target.macros_add": ["MBED_TICKLESS"],
             "target.tickless-from-us-ticker": false,