add feather esp32 rev C variant

Author: ladyada

boards.txt

@@ -201,3 +201,43 @@ espea32.menu.UploadSpeed.460800.upload.speed=460800
 espea32.menu.UploadSpeed.512000.windows=512000
 espea32.menu.UploadSpeed.512000.upload.speed=512000
 
+
+##############################################################
+featheresp32.name=Feather ESP32
+
+featheresp32.upload.tool=esptool
+featheresp32.upload.maximum_size=1044464
+featheresp32.upload.maximum_data_size=294912
+featheresp32.upload.wait_for_upload_port=true
+
+featheresp32.serial.disableDTR=true
+featheresp32.serial.disableRTS=true
+
+featheresp32.build.mcu=esp32
+featheresp32.build.core=esp32
+featheresp32.build.variant=feather_esp32
+featheresp32.build.board=FeatherESP32
+
+featheresp32.build.f_cpu=160000000L
+featheresp32.build.flash_mode=dio
+featheresp32.build.flash_size=4MB
+
+featheresp32.menu.FlashFreq.80=80MHz
+featheresp32.menu.FlashFreq.80.build.flash_freq=80m
+featheresp32.menu.FlashFreq.40=40MHz
+featheresp32.menu.FlashFreq.40.build.flash_freq=40m
+
+featheresp32.menu.UploadSpeed.921600=921600
+featheresp32.menu.UploadSpeed.921600.upload.speed=921600
+featheresp32.menu.UploadSpeed.115200=115200
+featheresp32.menu.UploadSpeed.115200.upload.speed=115200
+featheresp32.menu.UploadSpeed.256000.windows=256000
+featheresp32.menu.UploadSpeed.256000.upload.speed=256000
+featheresp32.menu.UploadSpeed.230400.windows.upload.speed=256000
+featheresp32.menu.UploadSpeed.230400=230400
+featheresp32.menu.UploadSpeed.230400.upload.speed=230400
+featheresp32.menu.UploadSpeed.460800.linux=460800
+featheresp32.menu.UploadSpeed.460800.macosx=460800
+featheresp32.menu.UploadSpeed.460800.upload.speed=460800
+featheresp32.menu.UploadSpeed.512000.windows=512000
+featheresp32.menu.UploadSpeed.512000.upload.speed=512000

variants/feather_esp32/pins_arduino.h

@@ -0,0 +1,20 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#define EXTERNAL_NUM_INTERRUPTS 16
+#define NUM_DIGITAL_PINS        40
+#define NUM_ANALOG_INPUTS       18
+
+#define analogInputToDigitalPin(p)
+#define digitalPinToInterrupt(p)    (((p)<40)?(p):-1)
+#define digitalPinHasPWM(p)         (p < 34)
+
+static const uint8_t SDA = 23;
+static const uint8_t SCL = 22;
+
+static const uint8_t SS    = 2;
+static const uint8_t MOSI  = 18;
+static const uint8_t MISO  = 19;
+static const uint8_t SCK   = 5;
+
+#endif /* Pins_Arduino_h */