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Initial support for Teensy 3.1
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‎teensy/Makefile‎

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ifeq ($(ARDUINO),)
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$(error Please define ARDUINO (where TeensyDuino is installed))
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endif
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TOOLS_PATH = $(ARDUINO)/hardware/tools
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COMPILER_PATH = $(TOOLS_PATH)/arm-none-eabi/bin
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CORE_PATH = $(ARDUINO)/hardware/teensy/cores/teensy3
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PYSRC=../py
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BUILD=build
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AS = $(COMPILER_PATH)/arm-none-eabi-as
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CC = $(COMPILER_PATH)/arm-none-eabi-gcc
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LD = $(COMPILER_PATH)/arm-none-eabi-ld
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OBJCOPY = $(COMPILER_PATH)/arm-none-eabi-objcopy
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SIZE = $(COMPILER_PATH)/arm-none-eabi-size
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CFLAGS_TEENSY = -DF_CPU=96000000 -DUSB_SERIAL -DLAYOUT_US_ENGLISH -D__MK20DX256__
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CFLAGS_CORTEX_M4 = -mthumb -mtune=cortex-m4 -mcpu=cortex-m4 -fsingle-precision-constant -Wdouble-promotion $(CFLAGS_TEENSY)
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CFLAGS = -I. -I$(PYSRC) -I$(CORE_PATH) -Wall -ansi -std=gnu99 -Os -DNDEBUG $(CFLAGS_CORTEX_M4)
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LDFLAGS = -nostdlib -T mk20dx256.ld
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LIBS = -L $(COMPILER_PATH)/../lib/gcc/arm-none-eabi/4.7.2/thumb2 -lgcc
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SRC_C = \
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main.c \
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lexerteensy.c \
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led.c \
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malloc0.c \
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printf.c \
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string0.c \
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usb.c \
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SRC_S = \
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gchelper.s \
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PY_O = \
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nlrthumb.o \
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gc.o \
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malloc.o \
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qstr.o \
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vstr.o \
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unicode.o \
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lexer.o \
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parse.o \
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scope.o \
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compile.o \
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emitcommon.o \
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emitpass1.o \
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emitbc.o \
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asmthumb.o \
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emitnthumb.o \
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emitinlinethumb.o \
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runtime.o \
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map.o \
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obj.o \
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objbool.o \
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objboundmeth.o \
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objcell.o \
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objclass.o \
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objclosure.o \
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objcomplex.o \
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objdict.o \
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objexcept.o \
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objfloat.o \
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objfun.o \
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objgenerator.o \
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objinstance.o \
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objint.o \
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objlist.o \
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objmodule.o \
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objnone.o \
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objrange.o \
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objset.o \
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objslice.o \
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objstr.o \
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objtuple.o \
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objtype.o \
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builtin.o \
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builtinimport.o \
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vm.o \
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showbc.o \
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repl.o \
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SRC_TEENSY = \
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mk20dx128.c \
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pins_teensy.c \
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analog.c \
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usb_desc.c \
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usb_dev.c \
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usb_mem.c \
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usb_serial.c \
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yield.c \
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OBJ = $(addprefix $(BUILD)/, $(SRC_C:.c=.o) $(SRC_S:.s=.o) $(PY_O) $(SRC_TEENSY:.c=.o))
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#LIB = -lreadline
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# the following is needed for BSD
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#LIB += -ltermcap
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PROG = micropython
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all: hex
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hex: $(PROG).hex
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post_compile: $(PROG).hex
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$(TOOLS_PATH)/teensy_post_compile -file="$(basename $<)" -path="$(CURDIR)" -tools="$(TOOLS_PATH)"
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reboot:
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-$(TOOLS_PATH)/teensy_reboot
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upload: post_compile reboot
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$(PROG).elf: $(BUILD) $(OBJ)
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$(CC) $(LDFLAGS) -o "$@" -Wl,-Map,$(PROG).map $(OBJ) $(LIBS)
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%.hex: %.elf
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$(SIZE) "$<"
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$(OBJCOPY) -O ihex -R .eeprom "$<" "$@"
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$(BUILD):
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mkdir -p $@
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$(BUILD)/%.o: %.s
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$(AS) -o $@ $<
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$(BUILD)/%.o: %.c
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$(CC) $(CFLAGS) -c -o $@ $<
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$(BUILD)/%.o: $(PYSRC)/%.S
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$(CC) $(CFLAGS) -c -o $@ $<
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$(BUILD)/%.o: $(PYSRC)/%.c mpconfigport.h
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$(CC) $(CFLAGS) -c -o $@ $<
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$(BUILD)/%.o: $(CORE_PATH)/%.c
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$(CC) $(CFLAGS) -c -o $@ $<
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$(BUILD)/emitnthumb.o: $(PYSRC)/emitnative.c $(PYSRC)/emit.h
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$(CC) $(CFLAGS) -DN_THUMB -c -o $@ $<
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# optimising gc for speed; 5ms down to 4ms
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$(BUILD)/gc.o: $(PYSRC)/gc.c
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$(CC) $(CFLAGS) -O3 -c -o $@ $<
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# optimising vm for speed, adds only a small amount to code size but makes a huge difference to speed (20% faster)
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$(BUILD)/vm.o: $(PYSRC)/vm.c
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$(CC) $(CFLAGS) -O3 -c -o $@ $<
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$(BUILD)/main.o: mpconfigport.h
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$(BUILD)/parse.o: $(PYSRC)/grammar.h
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$(BUILD)/compile.o: $(PYSRC)/grammar.h
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$(BUILD)/emitbc.o: $(PYSRC)/emit.h
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clean:
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/bin/rm -rf $(BUILD)
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/bin/rm -f $(PROG).elf $(PROG).hex $(PROG).map
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.PHONY: clean

‎teensy/README.md‎

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Build Instructions for Teensy 3.1
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This assumes that you have TeensyDuino installed and set the ARUINO environment
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variable pointing to the where Arduino with TeensyDuino is installed.
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```
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cd teensy
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ARDUINO=~/arduino-1.0.5 make
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```
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To build the loader
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```
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cd teensy/loader
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make
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```
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To upload micropython to the Teensy 3.1.
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Press the Program button on the Teensy 3.1
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```
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make upload
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```
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Currently, the python prompt is through the USB serial interface.
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The LED will blink (100 msec on/100 msec off) while waiting for the USB Serial
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device to be configured, and will blink (200 msec on/200 msec off) while
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sitting at the readline prompt.
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Currently, there is no I/O support configured (no GPIO, ADC, etc).

‎teensy/gchelper.s‎

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.syntax unified
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.cpu cortex-m4
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.thumb
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.text
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.align 2
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@ void gc_helper_get_regs_and_clean_stack(r0=uint regs[10], r1=heap_end)
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.global gc_helper_get_regs_and_clean_stack
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.thumb
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.thumb_func
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.type gc_helper_get_regs_and_clean_stack, %function
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gc_helper_get_regs_and_clean_stack:
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@ store registers into given array
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str r4, [r0], #4
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str r5, [r0], #4
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str r6, [r0], #4
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str r7, [r0], #4
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str r8, [r0], #4
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str r9, [r0], #4
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str r10, [r0], #4
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str r11, [r0], #4
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str r12, [r0], #4
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str r13, [r0], #4
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@ clean the stack from given pointer up to current sp
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movs r0, #0
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mov r2, sp
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b.n .entry
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.loop:
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str r0, [r1], #4
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.entry:
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cmp r1, r2
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bcc.n .loop
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bx lr
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.size gc_helper_get_regs_and_clean_stack, .-gc_helper_get_regs_and_clean_stack

‎teensy/led.c‎

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#include <stdio.h>
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#include "misc.h"
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#include "mpconfig.h"
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#include "obj.h"
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#include "led.h"
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#include "Arduino.h"
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void led_init(void) {
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}
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void led_state(pyb_led_t led, int state) {
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uint8_t pin;
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if (led == 0) {
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pin = LED_BUILTIN;
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} else {
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return;
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}
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digitalWrite(pin, state);
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}
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void led_toggle(pyb_led_t led) {
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uint8_t pin;
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if (led == 0) {
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pin = LED_BUILTIN;
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} else {
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return;
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}
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digitalWrite(pin, !digitalRead(pin));
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}
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/******************************************************************************/
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/* Micro Python bindings */
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typedef struct _pyb_led_obj_t {
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mp_obj_base_t base;
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uint led_id;
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} pyb_led_obj_t;
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void led_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in) {
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pyb_led_obj_t *self = self_in;
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print(env, "<LED %lu>", self->led_id);
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}
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mp_obj_t led_obj_on(mp_obj_t self_in) {
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pyb_led_obj_t *self = self_in;
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led_state(self->led_id, 1);
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return mp_const_none;
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}
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mp_obj_t led_obj_off(mp_obj_t self_in) {
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pyb_led_obj_t *self = self_in;
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led_state(self->led_id, 0);
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return mp_const_none;
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}
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static MP_DEFINE_CONST_FUN_OBJ_1(led_obj_on_obj, led_obj_on);
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static MP_DEFINE_CONST_FUN_OBJ_1(led_obj_off_obj, led_obj_off);
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static const mp_obj_type_t led_obj_type = {
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{ &mp_const_type },
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"Led",
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led_obj_print, // print
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NULL, // make_new
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NULL, // call_n
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NULL, // unary_op
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NULL, // binary_op
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NULL, // getiter
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NULL, // iternext
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{ // method list
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{ "on", &led_obj_on_obj },
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{ "off", &led_obj_off_obj },
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{ NULL, NULL },
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}
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};
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mp_obj_t pyb_Led(mp_obj_t led_id) {
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pyb_led_obj_t *o = m_new_obj(pyb_led_obj_t);
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o->base.type = &led_obj_type;
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o->led_id = mp_obj_get_int(led_id);
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return o;
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}

‎teensy/led.h‎

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typedef enum {
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PYB_LED_BUILTIN = 0,
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} pyb_led_t;
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void led_init(void);
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void led_state(pyb_led_t led, int state);
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void led_toggle(pyb_led_t led);
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mp_obj_t pyb_Led(mp_obj_t led_id);

‎teensy/lexerteensy.c‎

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#include <stdint.h>
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#include <stdio.h>
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#include "misc.h"
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#include "lexer.h"
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#include "lexerteensy.h"
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unichar str_buf_next_char(mp_lexer_str_buf_t *sb) {
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if (sb->src_cur < sb->src_end) {
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return *sb->src_cur++;
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} else {
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return MP_LEXER_CHAR_EOF;
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}
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}
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void str_buf_free(mp_lexer_str_buf_t *sb) {
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if (sb->free) {
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m_del(char, (char*)sb->src_beg, 0 /* don't know allocated size of src */);
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}
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}
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mp_lexer_t *mp_lexer_new_from_str_len(const char *src_name, const char *str, uint len, bool free_str, mp_lexer_str_buf_t *sb) {
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sb->free = free_str;
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sb->src_beg = str;
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sb->src_cur = str;
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sb->src_end = str + len;
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return mp_lexer_new(src_name, sb, (mp_lexer_stream_next_char_t)str_buf_next_char, (mp_lexer_stream_close_t)str_buf_free);
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}
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mp_lexer_t *mp_import_open_file(qstr mod_name) {
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printf("import not implemented\n");
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return NULL;
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}

‎teensy/lexerteensy.h‎

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typedef struct _py_lexer_str_buf_t {
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bool free; // free src_beg when done
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const char *src_beg; // beginning of source
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const char *src_cur; // current location in source
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const char *src_end; // end (exclusive) of source
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} mp_lexer_str_buf_t;
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mp_lexer_t *mp_lexer_new_from_str_len(const char *src_name, const char *str, uint len, bool free_str, mp_lexer_str_buf_t *sb);

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