new: support ESP32 (first with a DoIt ESP32 DevKit V1)

chg: wiring-timer 2.8.0 (yield() implementation available only by preprocessor directive)

platformio.ini

@@ -22,26 +22,31 @@ default_envs =
 ;  featherm0
 ;  huzzah
 ;  nodemcu
+;  esp32doit-devkit-v1
 ;  due
 ;  mega2560
   uno
 
 [common]
+build_flags_ext =
+  -D WIRINGTIMER_SUPPRESS_WARNINGS          # avoid warning from wiring-timer build
 lib_deps_builtin = 
   SPI
   Wire
 lib_deps_external = 
   SerialCommand
-  wiring-timer@>=2.7.0
+  wiring-timer@>=2.8.0
   dbg-trace@>=1.1.0
   debug-cli@>=1.3.0
-  https://github.com/dniklaus/wiring-app-debug
-  https://github.com/dniklaus/arduino-utils-mem
+  https://github.com/dniklaus/wiring-app-debug#1.4.0
+  https://github.com/dniklaus/arduino-utils-mem#2.1.0
 
 [env:featherm0]
 platform = atmelsam
 board = adafruit_feather_m0
 framework = arduino
+build_flags =
+  ${common.build_flags_ext}
 lib_deps =
   ${common.lib_deps_builtin}
   ${common.lib_deps_external}
@@ -52,6 +57,8 @@ lib_deps =
 platform = espressif8266
 framework = arduino
 board = huzzah
+build_flags =
+  ${common.build_flags_ext}
 lib_deps =
   ${common.lib_deps_builtin}
   ${common.lib_deps_external}
@@ -61,15 +68,30 @@ lib_deps =
 platform = espressif8266
 framework = arduino
 board = nodemcuv2
+build_flags =
+  ${common.build_flags_ext}
 lib_deps =
   ${common.lib_deps_builtin}
   ${common.lib_deps_external}
 ;upload_port = COM21
 
+[env:esp32doit-devkit-v1]
+platform = espressif32
+framework = arduino
+board = esp32doit-devkit-v1
+build_flags =
+  ${common.build_flags_ext}
+lib_deps =
+  ${common.lib_deps_builtin}
+  ${common.lib_deps_external}
+;upload_port = COM28
+
 [env:due]
 platform = atmelsam
 board = due
 framework = arduino
+build_flags =
+  ${common.build_flags_ext}
 lib_deps =
   ${common.lib_deps_builtin}
   ${common.lib_deps_external}
@@ -79,6 +101,8 @@ lib_deps =
 platform = atmelavr
 board = megaatmega2560
 framework = arduino
+build_flags =
+  ${common.build_flags_ext}
 lib_deps =
   ${common.lib_deps_builtin}
   ${common.lib_deps_external}
@@ -88,6 +112,8 @@ lib_deps =
 platform = atmelavr
 board = uno
 framework = arduino
+build_flags =
+  ${common.build_flags_ext}
 lib_deps =
   ${common.lib_deps_builtin}
   ${common.lib_deps_external}