snek/grove: Add port for Seeed's Grove Beginner Kit

This supports many of the devices supplied in this kit, including:

 1. LED
 2. Buzzer (with tone function)
 3. Light sensor
 4. Sound sensor
 5. Button
 6. Rotary Potentiometer
 7. Air Pressure
 8. 3-Axis Acceleration

Still to add:

 1. OLED display
 2. Temperature and Humidity

Of course, the ROM is full at this point, so adding these presents a
significant challenge.

Signed-off-by: Keith Packard <keithp@keithp.com>

ports/grove/.gitignore

@@ -0,0 +1,4 @@
+snek-grove-*.elf
+snek-grove-*.hex
+snek-grove-*.map
+snek-grove-install

ports/grove/Makefile

@@ -0,0 +1,86 @@
+#
+# Copyright © 2020 Keith Packard <keithp@keithp.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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
+# General Public License for more details.
+#
+
+SNEK_ROOT = ../..
+SNEK_ATMEGA = $(SNEK_ROOT)/chips/atmega
+SNEK_NO_DICT = 1
+SNEK_NO_SLICE = 1
+
+include $(SNEK_ATMEGA)/snek-atmega.defs
+
+SNEK_LOCAL_VPATH = $(SNEK_ATMEGA)
+
+SNEK_LOCAL_SRC = \
+	snek-pow.c \
+	snek-328p.c \
+	snek-atmega-i2c.c \
+	snek-bmp280.c \
+	snek-lis3dh.c \
+	$(SNEK_ATMEGA_SRC)
+
+SNEK_LOCAL_INC = \
+	$(SNEK_ATMEGA_INC)
+
+SNEK_LOCAL_BUILTINS = \
+	$(SNEK_ATMEGA_BUILTINS) \
+	snek-328p.builtin \
+	snek-grove.builtin
+
+include $(SNEK_ROOT)/snek-install.defs
+
+SNEK_CFLAGS = $(SNEK_MOST_WARNINGS) $(SNEK_BASE_CFLAGS) -DUART_BAUD=115200
+
+BASE=snek-grove-$(SNEK_VERSION)
+ELF=$(BASE).elf
+HEX=$(BASE).hex
+MAP=$(BASE).map
+CC=avr-gcc
+
+OPT=-Os -frename-registers -funsigned-char -fno-jump-tables -mcall-prologues
+
+CFLAGS=$(OPT) -DF_CPU=16000000UL -mmcu=atmega328p -I. -I$(SNEK_LOCAL_VPATH) -g $(SNEK_CFLAGS) -Waddr-space-convert
+LDFLAGS=$(SNEK_LDFLAGS) \
+	-Wl,-uvfprintf -lprintf_flt -lm \
+	-Wl,--defsym -Wl,__TEXT_REGION_LENGTH__=0x7e00 \
+	-Wl,--defsym -Wl,__DATA_REGION_ORIGIN__=0x800100 \
+	-Wl,--defsym -Wl,__DATA_REGION_LENGTH__=0x780 \
+	-Wl,--defsym -Wl,__EEPROM_REGION_LENGTH__=0x400 \
+	-Wl,-Map=$(MAP)
+
+all: $(HEX) snek-grove-install
+
+$(HEX): $(ELF)
+	avr-objcopy -O ihex -R .eeprom $^ $@
+
+$(ELF): $(SNEK_OBJ)
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+	@gawk '/__data_load_end/{printf("ROM used: %d bytes\n", strtonum($$1)); }' $(MAP)
+
+snek-grove-install: snek-grove-install.in
+	$(SNEK_SED) $^ > $@
+	chmod +x $@
+
+load: $(HEX) snek-grove-install
+	./snek-grove-install -hex $(HEX)
+
+install: snek-grove-install $(HEX) snek-grove-install.1
+	install -d $(DESTDIR)$(BINDIR)
+	install snek-grove-install $(DESTDIR)$(BINDIR)
+	install -d $(DESTDIR)$(SHAREDIR)
+	install -m 0644 $(HEX) $(DESTDIR)$(SHAREDIR)
+	install -d $(DESTDIR)$(MANDIR)/man1
+	install -m 0644 snek-grove-install.1 $(DESTDIR)$(MANDIR)/man1
+
+clean::
+	rm -f snek*.elf snek*.hex snek*.map snek-grove-install

ports/grove/snek-grove-install.1

@@ -0,0 +1,54 @@
+.\"
+.\" Copyright © 2020 Keith Packard <keithp@keithp.com>
+.\"
+.\" This program is free software; you can redistribute it and/or modify
+.\" it under the terms of the GNU General Public License as published by
+.\" the Free Software Foundation, either version 3 of the License, or
+.\" (at your option) any later version.
+.\"
+.\" This program 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
+.\" General Public License for more details.
+.\"
+.TH SNEK-MEGA-INSTALL 1 "snek-uno-install" ""
+.SH NAME
+snek-uno-install \- Install Snek to Arduino Uno
+.SH SYNOPSIS
+.B "snek-uno-install" [OPTION]... [COMMAND]
+.SH DESCRIPTION
+.I snek-uno-install
+installs the Snek programming language on an ATmega328P Arduino Uno
+board, including the ability to re-program the ATmega16u2 chip used as
+a usbserial converter.
+.SH OPTIONS
+.TP
+\-port <port>
+Specifies the serial port to use when programming the ATmega328p chip,
+the default is '/dev/ttyACM0'.
+.TP
+\-isp <ISP model>
+Specifies the programmer to use when programming the ATmega16u2 chip
+used as a usb to serial converter, common options are 'usbtiny'
+and 'avrisp2'. The default is 'usbtiny'.
+.TP
+\-hex <snek.hex>
+Specifies the hex file to load to the board. The default is the
+currently installed version of Snek when programming the ATmega328p, and the
+currently installed version of the usbserial program when programming
+the ATmega16u2.
+.SH COMMANDS
+.TP
+snek
+Loads  Snek to the target device. This is the default command. Note
+that snekde will not be able to get/put programs to the device without
+also reprogramming the ATmega16u2 device used as a usb to serial
+converter on the Arduino Uno board.
+.TP
+usbserial
+Loads the updated usbserial converter firmware to the ATmega16u2
+device on the Arduino Uno board. This version supports the XON/XOFF
+flow control required for SnekDE to be able to successfully
+communicate with Snek running on the ATmega328p processor.
+.SH AUTHOR
+Keith Packard

ports/grove/snek-grove-install.in

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+SHAREDIR="@SHAREDIR@"
+
+HEX="@SHAREDIR@/snek-grove-@SNEK_VERSION@.hex"
+PORT=/dev/ttyUSB0
+
+mode=arg
+
+for i in "$@"; do
+    case "$mode" in
+	arg)
+	    case "$i" in
+		-port|--port)
+		    mode=port
+		    ;;
+		-hex|--hex)
+		    mode=hex
+		    ;;
+		*)
+		      echo "Usage: $0 {-port $PORT} {-hex snek-grove.hex}" 1>&2
+		      exit 1
+		      ;;
+	    esac
+	    ;;
+	port)
+	    PORT="$i"
+	    mode=arg
+	    ;;
+	hex)
+	    HEX="$i"
+	    mode=arg
+	    ;;
+    esac
+done
+
+avrdude -pATMEGA328P -carduino -P$PORT -b115200 -D -U flash:w:"${HEX}":i

ports/grove/snek-grove.builtin

@@ -0,0 +1,18 @@
+#
+# Copyright © 2019 Keith Packard <keithp@keithp.com>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program 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
+# General Public License for more details.
+#
+A6, -2, 20
+accel, 0
+baro, 0
+tone, 1
+#define SNEK_TONE

snek-install.defs

@@ -25,6 +25,7 @@ FIRMWARE ?= \
 	$(SNEK_PORTS)/crickit/snek-crickit-$(SNEK_VERSION).uf2 \
 	$(SNEK_PORTS)/duemilanove/snek-duemilanove-$(SNEK_VERSION).hex \
 	$(SNEK_PORTS)/feather/snek-feather-$(SNEK_VERSION).uf2 \
+	$(SNEK_PORTS)/grove/snek-grove-$(SNEK_VERSION).hex \
 	$(SNEK_PORTS)/itsybitsy3v/snek-itsybitsy3v-$(SNEK_VERSION).hex \
 	$(SNEK_PORTS)/itsybitsy5v/snek-itsybitsy5v-$(SNEK_VERSION).hex \
 	$(SNEK_PORTS)/itsybitsym0/snek-itsybitsym0-$(SNEK_VERSION).uf2 \