Add rs232 atom board

platformio.ini

@@ -59,6 +59,16 @@ build_flags =
 upload_port = /dev/esp32
 upload_protocol = esptool
 
+[env:m5stack-atom-rs232-canunit]
+board = m5stack-atom
+lib_deps = ${env.lib_deps}
+build_flags = 
+        -D BOARD_M5ATOM_RS232_CANUNIT
+        ${env.build_flags}
+upload_port = /dev/esp32
+upload_protocol = esptool
+
+
 [env:m5stickc-atom-canunit]
 board = m5stick-c
 lib_deps = ${env.lib_deps}