First addition of ESP320 support (espressif#19)

* First addition of ESP320 support

* Updated maximum data size.

boards.txt

@@ -40,3 +40,43 @@ esp32.menu.UploadSpeed.460800.macosx=460800
 esp32.menu.UploadSpeed.460800.upload.speed=460800
 esp32.menu.UploadSpeed.512000.windows=512000
 esp32.menu.UploadSpeed.512000.upload.speed=512000
+
+##############################################################
+esp320.name=Electronic SweetPeas - ESP320
+
+esp320.upload.tool=esptool
+esp320.upload.maximum_size=1044464
+esp320.upload.maximum_data_size=294912
+esp320.upload.wait_for_upload_port=true
+
+esp320.serial.disableDTR=true
+esp320.serial.disableRTS=true
+
+esp320.build.mcu=esp32
+esp320.build.core=esp32
+esp320.build.variant=esp320
+esp320.build.board=ESP320
+
+esp320.build.f_cpu=160000000L
+esp320.build.flash_mode=qio
+esp320.build.flash_size=4MB
+
+esp320.menu.FlashFreq.80=80MHz
+esp320.menu.FlashFreq.80.build.flash_freq=80m
+esp320.menu.FlashFreq.40=40MHz
+esp320.menu.FlashFreq.40.build.flash_freq=40m
+
+esp320.menu.UploadSpeed.921600=921600
+esp320.menu.UploadSpeed.921600.upload.speed=921600
+esp320.menu.UploadSpeed.115200=115200
+esp320.menu.UploadSpeed.115200.upload.speed=115200
+esp320.menu.UploadSpeed.256000.windows=256000
+esp320.menu.UploadSpeed.256000.upload.speed=256000
+esp320.menu.UploadSpeed.230400.windows.upload.speed=256000
+esp320.menu.UploadSpeed.230400=230400
+esp320.menu.UploadSpeed.230400.upload.speed=230400
+esp320.menu.UploadSpeed.460800.linux=460800
+esp320.menu.UploadSpeed.460800.macosx=460800
+esp320.menu.UploadSpeed.460800.upload.speed=460800
+esp320.menu.UploadSpeed.512000.windows=512000
+esp320.menu.UploadSpeed.512000.upload.speed=512000

variants/esp320/pins_arduino.h

@@ -0,0 +1,33 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+
+#define digitalPinToPort(pin)       (0)
+#define digitalPinToBitMask(pin)    (1UL << (pin))
+#define digitalPinToTimer(pin)      (0)
+#define portOutputRegister(port)
+#define portInputRegister(port)
+#define portModeRegister(port)
+
+#define NOT_A_PIN -1
+#define NOT_A_PORT -1
+#define NOT_AN_INTERRUPT -1
+#define NOT_ON_TIMER 0
+
+#define EXTERNAL_NUM_INTERRUPTS 11
+#define NUM_DIGITAL_PINS        12
+#define NUM_ANALOG_INPUTS       5
+
+#define analogInputToDigitalPin(p)
+#define digitalPinToInterrupt(p)
+#define digitalPinHasPWM(p)
+
+static const uint8_t SDA = 2;
+static const uint8_t SCL = 14;
+
+static const uint8_t SS    = 15;
+static const uint8_t MOSI  = 13;
+static const uint8_t MISO  = 12;
+static const uint8_t SCK   = 14;
+
+#endif /* Pins_Arduino_h */