Allow GPIO 9 and 10 for waveform generation (esp8266#5055)

* Allow GPIO 9 and 10 for waveform generation

While most ESP8266 modules use quad-io mode for their SPI flash ROM,
there are some which only use dual-io mode.  Allow the unused pins
(GPIO 9 and 10) to have waveforms generated on them.  Should the user try
this on a quad-io mode board, expect very bad things to happen.

* Add variant for 8285 to init GPIO 9/10

The 8285 only has 2-bit flash IO, so the other two pins can be used as
inputs (9/10).  Set them to input to mirror the way other pins are set
up.

* Update waveform gen to only allow 9/10 on 8285

Update the common.h in both generic (remove TODO, it's done!) and the
8285 variant to make isFlashInterfacePin macro correct.  Use that macro
to disable pins 9 and 10 in the common, non-8285 case.

boards.txt

@@ -360,6 +360,7 @@ generic.menu.baud.921600.upload.speed=921600
 ##############################################################
 esp8285.name=Generic ESP8285 Module
 esp8285.build.board=ESP8266_ESP01
+esp8285.build.variant=esp8285
 esp8285.upload.tool=esptool
 esp8285.upload.maximum_data_size=81920
 esp8285.upload.wait_for_upload_port=true
@@ -368,7 +369,6 @@ esp8285.serial.disableDTR=true
 esp8285.serial.disableRTS=true
 esp8285.build.mcu=esp8266
 esp8285.build.core=esp8266
-esp8285.build.variant=generic
 esp8285.build.spiffs_pagesize=256
 esp8285.build.debug_port=
 esp8285.build.debug_level=

cores/esp8266/core_esp8266_waveform.c

@@ -79,7 +79,13 @@ static Waveform waveform[] = {
   {0, 0, 1<<3, 0, 0, 0, 0, 0},
   {0, 0, 1<<4, 0, 0, 0, 0, 0},
   {0, 0, 1<<5, 0, 0, 0, 0, 0},
-  // GPIOS 6-11 not allowed, used for flash
+  // GPIOS 6-8 not allowed, used for flash
+  // GPIO 9 and 10 only allowed in 2-bit flash mode
+#if !isFlashInterfacePin(9)
+  {0, 0, 1<<9, 0, 0, 0, 0, 0},
+  {0, 0, 1<<10, 0, 0, 0, 0, 0},
+#endif
+  // GPIO 11 not allowed, used for flash
   {0, 0, 1<<12, 0, 0, 0, 0, 0},
   {0, 0, 1<<13, 0, 0, 0, 0, 0},
   {0, 0, 1<<14, 0, 0, 0, 0, 0},

tools/boards.txt.py

@@ -271,6 +271,7 @@
         'name': 'Generic ESP8285 Module',
         'opts': {
             '.build.board': 'ESP8266_ESP01',
+            '.build.variant': 'esp8285'
             },
         'macro': [
             'resetmethod_menu',

variants/esp8285/common.h

@@ -0,0 +1,83 @@
+/*
+  common.h - Commoon pin definition functions for ESP8266 boards
+  Part of Arduino - http://www.arduino.cc/
+
+  Copyright (c) 2007 David A. Mellis
+  Modified for ESP8266 platform by Ivan Grokhotkov, 2014-2016.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+
+  $Id: wiring.h 249 2007-02-03 16:52:51Z mellis $
+*/
+
+#ifndef GENERIC_COMMON_H
+#define GENERIC_COMMON_H
+
+#define EXTERNAL_NUM_INTERRUPTS 16
+#define NUM_DIGITAL_PINS        17
+#define NUM_ANALOG_INPUTS       1
+
+// Pins 9 and 10 are available, go to positive logic since it's clearer 
+#define isFlashInterfacePin(p)      ((p) == 6 || (p) == 7 || (p) == 8 || (p) == 11)
+
+#define analogInputToDigitalPin(p)  ((p > 0) ? NOT_A_PIN : 0)
+#define digitalPinToInterrupt(p)    (((p) < EXTERNAL_NUM_INTERRUPTS)? (p) : NOT_AN_INTERRUPT)
+#define digitalPinHasPWM(p)         (((p) < NUM_DIGITAL_PINS && !isFlashInterfacePin(p))? 1 : 0)
+
+#define PIN_SPI_SS   (15)
+#define PIN_SPI_MOSI (13)
+#define PIN_SPI_MISO (12)
+#define PIN_SPI_SCK  (14)
+
+static const uint8_t SS    = PIN_SPI_SS;
+static const uint8_t MOSI  = PIN_SPI_MOSI;
+static const uint8_t MISO  = PIN_SPI_MISO;
+static const uint8_t SCK   = PIN_SPI_SCK;
+
+#ifndef PIN_A0
+#define PIN_A0 (17)
+#endif /* PIN_A0 */
+
+static const uint8_t A0 = PIN_A0;
+
+// These serial port names are intended to allow libraries and architecture-neutral
+// sketches to automatically default to the correct port name for a particular type
+// of use.  For example, a GPS module would normally connect to SERIAL_PORT_HARDWARE_OPEN,
+// the first hardware serial port whose RX/TX pins are not dedicated to another use.
+//
+// SERIAL_PORT_MONITOR        Port which normally prints to the Arduino Serial Monitor
+//
+// SERIAL_PORT_USBVIRTUAL     Port which is USB virtual serial
+//
+// SERIAL_PORT_LINUXBRIDGE    Port which connects to a Linux system via Bridge library
+//
+// SERIAL_PORT_HARDWARE       Hardware serial port, physical RX & TX pins.
+//
+// SERIAL_PORT_HARDWARE_OPEN  Hardware serial ports which are open for use.  Their RX & TX
+//                            pins are NOT connected to anything by default.
+#define SERIAL_PORT_MONITOR        Serial
+#define SERIAL_PORT_USBVIRTUAL     Serial
+#define SERIAL_PORT_HARDWARE       Serial
+#define SERIAL_PORT_HARDWARE_OPEN  Serial1
+
+#ifdef LED_BUILTIN
+#ifdef __cplusplus
+extern "C"
+#endif
+const int BUILTIN_LED __attribute__((deprecated, weak)) = LED_BUILTIN;
+#endif
+
+#endif /* GENERIC_COMMON_H */

variants/esp8285/initD9D10Pins.cpp

@@ -0,0 +1,10 @@
+#include "Arduino.h"
+
+// The 8285 allows the use of GPIO pins 9 and 10, so set them to inputs
+// on startup just like the other pins.  This allows their use for interrupts
+// as well
+void initVariant() {
+  pinMode(9, INPUT);
+  pinMode(10, INPUT);
+}
+

variants/esp8285/pins_arduino.h

@@ -0,0 +1,41 @@
+/*
+  pins_arduino.h - Pin definition functions for Arduino
+  Part of Arduino - http://www.arduino.cc/
+
+  Copyright (c) 2007 David A. Mellis
+  Modified for ESP8266 platform by Ivan Grokhotkov, 2014-2015.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+
+  $Id: wiring.h 249 2007-02-03 16:52:51Z mellis $
+*/
+
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#define PIN_WIRE_SDA (4)
+#define PIN_WIRE_SCL (5)
+
+static const uint8_t SDA = PIN_WIRE_SDA;
+static const uint8_t SCL = PIN_WIRE_SCL;
+
+#ifndef LED_BUILTIN
+#define LED_BUILTIN 1
+#endif
+
+#include "common.h"
+
+#endif /* Pins_Arduino_h */

variants/generic/common.h

@@ -30,7 +30,6 @@
 #define NUM_DIGITAL_PINS        17
 #define NUM_ANALOG_INPUTS       1
 
-// TODO: this should be <= 9 if flash is in DIO mode
 #define isFlashInterfacePin(p)      ((p) >= 6 && (p) <= 11)
 
 #define analogInputToDigitalPin(p)  ((p > 0) ? NOT_A_PIN : 0)