Add nRF52840 env to platformio.ini

platformio.ini

@@ -57,11 +57,12 @@
 
 
 ; default_envs = esp32-s3n4r2
-default_envs=esp32s3-opi
+; default_envs=esp32s3-opi
 ; default_envs=esp32s3-qspi
 ; default_envs=esp32c3
 ; default_envs=esp32dev
 ; default_envs = rp2040
+default_envs = nrf52840
 
 ; Custom board variant
 boards_dir = ./board
@@ -158,4 +159,14 @@ extends = env
 platform = https://github.com/maxgerhardt/platform-raspberrypi.git
 board = pico
 framework = arduino
-board_build.core = earlephilhower
+board_build.core = earlephilhower
+
+[env:nrf52840]
+platform = nordicnrf52
+board = nrf52840_dk_adafruit
+framework = arduino
+monitor_speed = 115200
+
+; upload_protocol = nrfutil
+; upload_protocol = nrfjprog
+upload_protocol = jlink